• 专利附录
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    • 专利摘要:
    The invention relates to a device for the arrangement of at least one private acoustic zone in the passenger compartment of a vehicle, comprising: a plurality of reception elements (M1, M2, M3, M4, M5, M6, M7, M8, M9, M10, M11, M12) of at least one initial sound signal, distributed in the passenger compartment of the vehicle, - at least one sound emission element (HP1, HP2, HP3, HP3, HP4, HP5 , HP6, HP7, HP8, HP9, HP10, HP10, HP11, HP12) adapted to emit an attenuation sound signal in an area of the passenger compartment outside the first private acoustic zone, and - a control unit programmed for a ) receive and process information relating to each initial sound signal transmitted by said reception elements, to identify a place of emission of this initial sound signal, b) determine, according to each initial sound signal and its place of emission , said attenuation sound signal so that in at least part of the outside cabin area greater than the private acoustic zone, the amplitude of the overall sound signal resulting from the superimposition of each initial sound signal and the attenuation sound signal is less than the amplitude of the initial sound signal and c) to control the transmission of this signal sound attenuation by said at least one sound emission element.
    公开号:FR3078931A1
    申请号:FR1852201
    申请日:2018-03-14
    公开日:2019-09-20
    发明作者:Laurent Lancerica；Patrice Bertrand；Thierry Giaccone；Christophe Comps
    申请人:Renault SAS；
    IPC主号:
    专利说明:

    Technical field to which the invention relates
    The present invention relates to a device and method for the arrangement of at least one private acoustic zone in the passenger compartment of a vehicle.
    TECHNOLOGICAL BACKGROUND
    Devices and methods are known to limit the amplitude of engine sounds heard by passengers in a vehicle.
    To do this, means for receiving engine noises are arranged near the noisy elements of this engine. All of the noise received by these reception means is then attenuated by the emission, throughout the passenger compartment, of an audible signal adapted to interfere with engine noise to limit their amplitude to a position of given observation of the passenger compartment.
    These devices and methods limit ambient noise from the engine in the passenger compartment and provide greater comfort to vehicle passengers. However, they do not allow you to select a particular sound signal from the noise detected in order to limit its amplitude in a specific area of the vehicle.
    It is therefore not possible to selectively attenuate certain sound signals in a part of the passenger compartment.
    Object of the invention
    In order to remedy the aforementioned drawback of the prior art, the present invention provides a device making it possible to selectively attenuate an audible signal in a part of the passenger compartment of the vehicle.
    More particularly, a device according to the invention is proposed for the arrangement of at least one private acoustic zone in the passenger compartment of a vehicle, comprising:
    - a plurality of elements for receiving at least one initial sound signal, distributed in the passenger compartment of the vehicle,
    - at least one sound emission element adapted to emit an attenuation sound signal in a zone of the passenger compartment outside the first private acoustic zone, and
    - a control unit programmed for
    a) receive and process information relating to each initial sound signal transmitted by said reception elements, to identify a place of emission of this initial sound signal,
    b) determine, as a function of each initial sound signal and its place of emission, said sound attenuation signal so that, in at least part of the area of the passenger compartment outside the private acoustic area, the amplitude of the overall sound signal resulting from the superimposition of each initial sound signal and the attenuation sound signal is less than the amplitude of said initial sound signal and
    c) controlling the emission of this attenuation sound signal by said at least one sound emission element.
    This device authorizes the development of a private acoustic zone in the vehicle interior.
    At least part of all the sound signals emitted in this private acoustic zone is attenuated in the rest of the passenger compartment so that only the passenger or passengers of the vehicle seated in the private acoustic zone hear this part of the all the sound signals emitted in this private acoustic zone.
    Thanks to the device according to the invention, the sound signals emitted in the private acoustic zone can be attenuated in the rest of the passenger compartment in a selective manner, according to their place of emission.
    The private acoustic zone preferably surrounds one or more seats in the vehicle.
    Thus, it will be possible, for example, to attenuate outside the private acoustic zone the vocal audio signals emitted by the passengers seated in this zone, so that their discussions remain private. It will also be possible to selectively attenuate, in the rest of the passenger compartment, the music emitted in the private acoustic zone by a multimedia system of the vehicle so that only the passengers seated in the private acoustic zone hear this music. .
    Thus, passengers seated in the private acoustic zone can enjoy their conversations and music with confidence, knowing that passengers in other zones will not be able to hear these conversations or this music.
    Other non-limiting and advantageous characteristics of the device according to the invention, taken individually or in any technically possible combination, are the following:
    - in step a), the control unit is also programmed to determine a direction of propagation of each initial sound signal;
    said control unit is programmed to compare, in step a), the information relating to each initial sound signal transmitted by each reception element of said plurality of reception elements in order to deduce therefrom the place of transmission of this signal initial sound;
    - Said information relating to each initial sound signal includes at least its phase and / or its time delay and / or its amplitude;
    - Said control unit is programmed to determine, in step b), the attenuation sound signal so that the phase of this attenuation sound signal is in phase opposition with respect to the sum of each signal initial sound in said part of the area of the passenger compartment outside the private acoustic area;
    - A plurality of sound emission elements are provided, and the control unit is programmed to, in step c), control the emission of the attenuation sound signal by a part of the plurality of elements sound emission determined as a function of the direction of propagation of each initial sound signal;
    - the control unit is programmed to, in step c), control the emission of the attenuation sound signal intended to attenuate the same initial sound signal by at least two sound emission elements;
    - Said control unit is further programmed to determine, as a function of the initial sound signal and its place of emission, an amplification sound signal so that this amplification sound signal is in phase with the sound signal initial in a part of the private acoustic zone and for controlling the emission of this amplification sound signal;
    - for the arrangement of a plurality of private acoustic zones in the passenger compartment of the vehicle, the device comprises said private acoustic zone and at least one additional private acoustic zone, in which at least one additional sound emission element is provided an additional attenuation sound signal in an area of the passenger compartment outside the additional private acoustic zone, and in which said control unit is programmed to, in step b), determine, as a function of each sound signal initial and from its place of emission, said additional attenuation sound signal so that, in the area of the passenger compartment outside the additional private acoustic zone, the amplitude of the overall sound signal resulting from the superposition of each sound signal initial and the additional attenuation sound signal is less than the amplitude of said initial sound signal and, eg c), command the emission of this additional attenuation sound signal by said additional sound emission element.
    The invention also relates to a method of fitting out at least one private acoustic zone in the passenger compartment of a vehicle comprising the following steps:
    - reception of at least one initial sound signal by a plurality of reception elements,
    - determination of the place of emission of each initial sound signal,
    - Determination, as a function of each initial sound signal and of its place of emission, of an attenuation sound signal such that, in at least part of the area of the passenger compartment outside the private acoustic area, the amplitude of the overall sound signal resulting from the superimposition of each initial sound signal and the attenuation sound signal is less than the amplitude of said initial sound signal and
    - emission of this attenuation sound signal in the area of the passenger compartment outside the private acoustic area.
    Finally, the invention relates to a motor vehicle comprising at least one device according to one of the preceding claims, providing at least one private acoustic zone in the passenger compartment of the vehicle.
    Detailed description of an exemplary embodiment
    The description which follows with reference to the appended drawings, given by way of nonlimiting examples, will make it clear what the invention consists of and how it can be carried out.
    In the accompanying drawings, the single figure is a schematic view from above of the passenger compartment of a vehicle according to the invention.
    In the single figure, there is shown schematically the passenger compartment 100 of a vehicle according to the invention, equipped with a device for arranging a plurality of private acoustic zones.
    This is for example a private vehicle. Of course, it can also be a variant of a vehicle intended for collective transport, or for air, river or maritime transport.
    This passenger compartment 100 is delimited by side walls 100A formed here by the vehicle doors, at the front by a front wall 100B comprising the dashboard 101 and the front windshield, at the rear by a rear wall 100C comprising the rear windshield and through the roof and floor of the vehicle. The steering wheel 102 is schematically represented at the front of the passenger compartment 100.
    In the example shown, the passenger compartment 100 here comprises four seats defining four seats: the seats 103 front left, and seat 104 front right are individual seats while the seats 105, 106 rear left and rear right are part of a bench 107. Each seat 103, 104, 105, 106 is provided with a headrest 103A, 104A, 105A, 106A.
    Four seats are thus defined in the passenger compartment, which can accommodate four seated passengers. The head of each passenger seated in the passenger compartment is usually located near the headrest 103A, 104A, 105A, 106A of the seat on which he is seated.
    The vehicle is here equipped with a device for the arrangement of at least one private acoustic zone in the passenger compartment 100, according to the invention.
    In general, the device according to the invention is intended to authorize the development of a number of private acoustic zones less than or equal to the maximum number of seats in the vehicle.
    The private acoustic zones can have a fixed extent, predetermined for example during the installation of the device according to the invention, or have a variable extent which the passengers can adjust according to their needs, as explained below.
    In the example described here, the device according to the invention allows the development of a number of adjustable private acoustic zones between one and four private acoustic zones.
    Each private acoustic zone is preferably located around one or more seats of the vehicle, that is to say around one or more seats.
    More specifically, the device according to the invention comprises:
    - a plurality of reception elements M1, M2, M3, M4, M5, M6, M7,
    M8, M9, M10, M11, M12 of an audible signal, distributed in the passenger compartment 100 of the vehicle, and
    - at least one emission element HP1, HP2, HP3, HP4, HP5, HP6, HP7, HP8, HP9, HP10, HP11, HP12 of an attenuation sound signal
    - and a control unit (not shown) adapted to communicate with the reception and transmission elements.
    The control unit can be integrated into the vehicle's on-board computer.
    Said private acoustic zone being situated around at least one of the seats 103, 104, 105, 106 of the vehicle, said reception elements include at least one reception element positioned in the private acoustic zone and a reception element positioned at the outside the private acoustic zone and a number of sound emission elements is provided at least equal to the number of seats included in the private acoustic zone.
    The reception elements M1, M2, M3, M4, M5, M6, M7, M8, M9, M10, M11, M12 are for example microphones shown diagrammatically in the single figure by circles.
    Each microphone can be single or double, depending on whether they have one or two preferred reception directions.
    The single microphones M2, M4, M5, M6, M7, M9, M11 have a preferred reception direction oriented either towards the front of the vehicle or towards the rear of the vehicle, while the double microphones M1, M2, M3, M8 , M10, M12, represented by a barred circle, have two preferred directions of reception oriented towards the front and rear of the vehicle. The double microphones are therefore equivalent to two single microphones placed back-to-back.
    The receiving elements are distributed in the passenger compartment so as to be able to efficiently receive the sound signals emitted in all the private acoustic zones defined in the passenger compartment 100.
    When the device according to the invention provides only one private acoustic zone, there is preferably provided at least one receiving element in the private acoustic zone and one receiving element outside this zone. When several separate private acoustic zones are arranged by the device, there is preferably provided at least one reception element arranged in each private acoustic zone.
    Generally, the distribution of the receiving elements and their positions are determined according to an acoustic model of the vehicle interior.
    Such an acoustic model is determined according to methods known to those skilled in the art.
    The acoustic model of the passenger compartment makes it possible in particular to determine the propagation of a sound signal in the passenger compartment as a function of its place of emission, as well as to determine the main reflections of this sound signal and their propagation in the passenger compartment.
    The acoustic model of the passenger compartment similar to that shown in the single figure shows in particular a central longitudinal propagation direction along the front-rear axis of the vehicle passing between the front and rear seats, two lateral longitudinal propagation directions between the side walls and the front and rear transverse propagation directions and seats passing in front of each pair of front and rear seats. We will speak in the following of longitudinal and transverse sound transmission corridors.
    The acoustic model modeling the propagation of sounds in the passenger compartment is constantly updated according to the number of occupants in the car (by detecting weight on the seat or camera for example) and by analyzing the propagation of audio signals in the vehicle. This analysis can also be provided and used by multimedia and telephony organs in order to serve as a basis for echo cancellations and other algorithms optimizing the distribution of sound contents in the passenger compartment.
    The receiving elements M1, M2, M3, M4, M5, M6, M7, M8, M9, M10, M11, M12 are preferably located in height in the passenger compartment 100, preferably above the level of the seats 103, 104 and the seat 107. They are preferably situated at a height close to that of the head of the passengers when they are seated on the seats 103, 104 and the seat 107, and / or close to the roof of the vehicle .
    Thus, the effect of obstacles which are not intrinsic to the vehicle, for example the bodies of passengers, on the propagation of sound signals, and therefore their reception by the reception elements, is limited.
    It is preferably provided at least one main receiving element disposed opposite each seat of the vehicle, that is to say here opposite the back of each seat 103, 104, 105, 106, with at least one direction of privileged reception oriented towards the back of this seat, that is to say towards the rear of the vehicle.
    More specifically, these main reception elements are preferably arranged opposite each headrest 103A, 104A, 105A, 106A of the vehicle. Here, the main microphones M1, M3, M6, M7 are placed so that they are in front of each passenger, at face height, when the passengers are seated on the seats 103, 104, 105, 106. These main reception elements thus very effectively receive the sound signals emitted in each corresponding private acoustic zone, in particular the voice of each passenger seated in the corresponding seat.
    These main reception elements are thus distant from the longitudinal sound transmission corridors: left and right corridor between the doors and the seats, central corridor between the seats 103, 104 at the front and between the seats 105, 106 of the bench seat 107 to the rear.
    They are also distant from the parts of the passenger compartment situated below the level of the glass surfaces (windows and windshields) which receive numerous reflections of sound signals on the walls of the passenger compartment, and in particular on the glass surfaces which reflect significantly the sound signals.
    The seats 103, 104 and the seat 107 of the vehicle rather tend to absorb sound signals.
    The main microphones M1, M3 arranged at the front are dual and have a privileged direction of reception oriented towards the front and towards the rear of the vehicle: they receive on one side the voice of the passenger seated on the seat 103, 104 located opposite thanks to the rear-facing part of the microphone and the engine noises and the sound signals reflected on the front wall of the passenger compartment (dashboard and windshield) thanks to the part of the forward-facing microphone.
    The main microphones M6, M7 arranged at the rear are simple, and their preferred reception direction is oriented towards the rear of the vehicle.
    Central secondary reception elements, here the central secondary microphones M2 and M10 are arranged between the seats 103, 104 front and between the seats 105, 106 of the bench seat 107. They receive sound signals and reflections of sound signals propagating in the central longitudinal transmission corridor of the vehicle, coming mainly from the rear for the secondary microphone M10 and from the front for the secondary microphone M2. The M2 and M10 central secondary microphones are dual.
    Secondary lateral reception elements, here the lateral secondary microphones M8 and M12, are arranged between the rear doors of the vehicle and the bench seat 107.
    Finally, there is preferably provided a control receiving element M4, M5, M9, M11 located near the usual position of the head of each passenger, that is to say for example near each headrest. 103A, 104A, 105A, 106A of the vehicle. The role of these control reception elements will be explained later.
    In addition, more specifically, the arrangement of the microphones in the vehicle interior makes it possible here, by mechanical and acoustic construction, to ensure that:
    - any audible signal from the rear of the passenger compartment reaches the part of the central secondary microphone M2 oriented towards the rear of the vehicle before reaching the ears of the passengers seated in the front seats 103, 104,
    - any sound signal coming from the front of the passenger compartment, for example from the engine, or reflected on the front wall of the passenger compartment, arrives at the part of the central secondary microphone M2 facing forward before reaching the ears passengers seated in the front seats 103, 104,
    - any sound signal coming from the front of the passenger compartment arrives at the part of the central or lateral secondary microphones M8, M10, M12 oriented towards the front before reaching the ears of the passengers seated in the rear seat 107,
    - any sound signal coming from the rear, for example signals reflected on the rear wall of the passenger compartment, arrives at the part of the central or lateral secondary microphones M8, M10, M12 oriented towards the rear before reaching the ears passengers seated in the back seat 107.
    A plurality of sound emission elements HP1 to HP12 are provided here. These are speakers. They are represented schematically in the single figure by triangles associated with a sign representing a sound wave and its overall direction of emission.
    The device according to the invention preferably comprises at least one sound emission element associated with each private acoustic zone.
    Here, there is provided a longitudinal emission element HP1, HP2, HP7, HP8 arranged opposite each seat of the vehicle, that is to say opposite each seat 103, 104 front and each seat 105, 106 rear of the seat 107.
    The front speakers HP1, HP2 arranged opposite the seats 103, 104 are for example mounted on the dashboard of the vehicle. The rear speakers HP7, HP8 arranged opposite the seats 105, 106 of the bench seat 107 are for example mounted on the back of the seats 103, 104 before, in the support of these seats.
    These front and rear speakers HP1, HP2, HP7, HP8 emit in a longitudinal direction, towards the rear, and will therefore be particularly suitable for emitting an attenuation sound signal to attenuate an initial sound signal emitted towards the front, in a propagation direction close to the longitudinal direction.
    The angular range of the directions of propagation which can be canceled varies according to the loudspeakers, which can have an angular range of emission between approximately 20 ° and 180 °.
    In addition, the sound waves emitted by the loudspeaker are different in front of the loudspeaker and at the limits of the angular range of emission: the waves emitted at +/- 80 ° relative to the longitudinal axis of emission by example will be "curves" near the loudspeaker, while those emitted opposite, along the longitudinal axis, will be first plane then will become curves further from the loudspeaker. The loudspeaker's ability to emit the attenuation sound signal that best approximates the characteristics of the signal in phase opposition to the initial sound signal, even if the speaker is not in the exact center line of the direction of propagation of the initial sound signal, are also taken into account.
    Two mixed sound emission elements, i.e. here side speakers HP3, HP4, HP5, HP6, HP9, HP10, HP11, HP12 are also arranged laterally in each headrest 103A, 104A, 105A, 106A seats 103, 104, 105, 106, one located on the right side of the headrest and the other on the left side. These lateral loudspeakers emit in a diagonal forward direction, having a longitudinal component and a transverse component and will therefore be adapted to emit an attenuation sound signal to attenuate the longitudinal and transverse components of an initial sound signal emitted towards the rear.
    One can also consider fixing the speakers on the roof of the vehicle, with a direction of emission oriented from the roof to the floor of the vehicle.
    Generally, the reception elements are positioned set back from the sound emission elements, in order to minimize the reception of direct sound signals emitted by the sound emission elements.
    This reception of the direct sound signals emitted by the transmitting elements can also be compensated by a digital processing of the sound signals received by the receiving elements, which is carried out by the control unit.
    All or part of the reception and / or sound emission elements may also form part of the multimedia system of the vehicle, used for example for cordless telephony or listening to music.
    The reception and sound emission elements of the example described and shown here make it possible to define a number of private acoustic zones between one and four.
    The control unit of the device according to the invention is also programmed for:
    a) receive and process information relating to an initial sound signal transmitted by said reception elements, to deduce therefrom the place of emission of this initial sound signal,
    b) determining, as a function of said initial sound signal and its place of emission, an attenuation sound signal so that, in the zone of the passenger compartment outside one of said private acoustic zones, the amplitude of the signal overall sound resulting from the superposition of the initial sound signal and the attenuation sound signal is less than the amplitude of said initial sound signal and
    c) control the emission of this attenuation sound signal by one of said sound emission elements suitable for emitting the attenuation sound signal outside of this private acoustic zone.
    Preferably, in step a), the control unit is also programmed to deduce from information relating to the initial sound signal the direction of propagation of this signal and / or its multiple reflections on the walls of the vehicle and on the unknown obstacles. of the acoustic model, linked for example to bulky objects in the passenger compartment: packages, clothing, variability in the size and build of passengers ...
    Preferably, in step b), the control unit also takes into account the acoustic model of the passenger compartment, which corresponds to a propagation model of the sound signal calculated in the vehicle.
    The role of the attenuation sound signal is more precisely to attenuate the initial sound signal sufficiently so that this initial sound signal is not perceived by other passengers.
    This objective is for example achieved by reducing the amplitude of the initial sound signal by about 20 decibels. We can also consider dividing by a coefficient between 10 and 100 the amplitude of the initial sound signal.
    This device allows the implementation of the method of arrangement of at least one private acoustic zone in the passenger compartment of the vehicle according to the invention, which comprises the following steps:
    - reception of an initial sound signal by said reception elements,
    - determination of the place of emission of this initial sound signal,
    - Determination, as a function of said initial sound signal and of its place of emission, of an attenuation sound signal so that, in the zone of the passenger compartment outside one of the private acoustic zones, the amplitude of the overall sound signal resulting from the superposition of the initial sound signal and the attenuation sound signal is less than the amplitude of said initial sound signal and
    - emission of this attenuation sound signal in the area of the passenger compartment outside this private acoustic area.
    As mentioned previously, private acoustic zones, their number, position and extent can be fixed in advance by construction or be modular.
    Preferably, the number of private acoustic zones and the geometry of these zones can be adjusted according to the needs of the passengers. The control unit then comprises a control interface allowing one or more passengers, for example the driver or front passengers or each passenger, to indicate to the control unit how each private acoustic zone associated with a or more seats in the passenger compartment. More precisely, it is possible, for each private acoustic zone that can be defined, to indicate to the central unit whether it should be activated or not, that is to say acoustically isolated from each other private acoustic zone and / or from the rest of the cabin.
    In practice, in the example described here, a maximum of four individual private acoustic zones are provided, that is to say surrounding a single passenger. Each passenger can therefore activate the private acoustic zone in which they are seated, for example by telephoning without disturbing other passengers or without their conversation being heard by other passengers.
    This is achieved by pressing a button or using, for example, a voice command.
    It is also possible to indicate to the control unit that several of the individual private acoustic zones, here two or three, must be grouped together to form a single private acoustic zone allowing a discreet conversation between the passengers of these two or three grouped zones .
    This is done in a step prior to the implementation of the steps described above, which takes place as soon as at least one private acoustic zone is activated.
    During the implementation of the device according to the invention, an initial sound signal emitted in the passenger compartment is received by all of the reception elements. The source of this audio signal can be located inside or outside the passenger compartment. The sound sources inside the passenger compartment include the passengers (their voices) and the multimedia system. The sound sources located outside include in particular the engine which emits engine noise in the passenger compartment generally through the front wall of the passenger compartment.
    The reception elements, here the microphones M1 to M12, receive said initial sound signal. This initial sound signal is converted into an electrical signal by each microphone. Each electrical signal constitutes a set of data relating to the initial sound signal received by each reception element, at least part of which is transmitted to the control unit by each reception element.
    The control unit therefore receives part of the data relating to the initial sound signal received by each reception element.
    This data includes at least information on the phase and / or the time delay and / or the amplitude of the initial sound signal received by the corresponding reception element.
    The phase of the initial sound signal indicates its instantaneous situation in a period, the initial sound signal being periodic.
    The initial audio signal arrives at a distant microphone late. Time delay is the time it takes for the signal to propagate from the source that sent it to the receiver that received it.
    The control unit is programmed to analyze the phase shift of this initial sound signal when it arrives on each receiving element, to deduce the place of emission of this initial sound signal: the initial sound signal will arrive later on an element of reception more distant from its place of emission than on a reception element closer to its place of emission. Here it is a question of comparing the phase of the initial sound signal received by each reception element.
    This analysis is carried out on the basis of an algorithm taking into account the location of each reception element, the emission elements, the sound characteristics of the vehicle and the acoustics of the passenger compartment, in particular the acoustic model of the passenger compartment. This analysis makes it possible to separate the different components of the initial sound signal received, and to determine the place of emission of each of its components. This algorithm is used in particular by hands-free phone systems to cancel the echo sent back by the speakers to the remote user via the phone's microphone. In these telephony systems, the sound signal emitted and its source of emission are known; the estimate of the echo is usually done by a single microphone, and in some systems two microphones can be used to better estimate the residual echoes (reflections on the walls in an enclosed space for example). This algorithm is known to those skilled in the art and is not the subject of the present invention. It will therefore not be described in more detail here.
    The control unit is here programmed to take into account the amplitude of this initial sound signal when it arrives at each reception element, to deduce therefrom the place of emission of this initial sound signal: the amplitude of the sound signal The greater the initial the closer the receiving element is to the place of transmission.
    When a plurality of initial audio signals are detected by the receiving elements, the control unit is programmed to
    - receive and process information relating to each initial sound signal to identify a place of emission of this initial sound signal: the place of emission of each initial sound signal is thus determined;
    - determine, as a function of each initial sound signal and its place of emission, said attenuation sound signal so that, in at least part of the area of the passenger compartment outside the private acoustic area, the amplitude the overall sound signal resulting from the superposition of each initial sound signal and the attenuation sound signal is less than the amplitude of said initial sound signal; and
    - command the emission of this attenuation sound signal by said at least one sound emission element.
    In practice, in step b), the attenuation sound signal is determined to be in phase opposition with respect to the sum of each initial sound signal in said part of the area of the passenger compartment outside the private acoustic area. , as will be exemplified later.
    The initial audio signal is later considered to come from a single location.
    Here, determining the place of emission of the initial sound signal amounts to identifying the source of this initial sound signal: if the place of emission of the initial sound signal is located near the head of one of the passengers, it is acts on the voice of one of the passengers: if the emission site is located at the front of the vehicle, it is an engine noise.
    The control unit is then programmed to determine the attenuation sound signal according to the initial sound signal and its place of emission.
    In particular, the device according to the invention aims to attenuate or even cancel the sound of the voice of passengers located in the private acoustic zone defined for passengers located in the rest of the passenger compartment.
    Thus, the control unit is programmed to determine the attenuation sound signal as a function of the initial sound signal the emission location of which is located in certain parts of the private acoustic zone, which correspond for example to the usual position of the head of the passenger (s) seated in this private acoustic zone, so that, in the area of the passenger compartment outside the private acoustic zone, the amplitude of the overall sound signal resulting from the superposition of the initial sound signal and the sound signal of attenuation is less than the amplitude of said initial sound signal. The attenuation sound signal can also be determined when the emission site is located in other parts of the private acoustic zone, which correspond for example to the position of the speakers of the multimedia system or to a front part of the vehicle. including the motor.
    In addition, the control unit can be programmed to take into account the known sources of sound emissions from the vehicle: for example multimedia content or a conversation via the vehicle's telephone system and the sound of which is broadcast by the audio systems. vehicle emission. In this case, the position of the sound source is known and its mode of propagation is predetermined. The sound signal emitted by each known sound emission source, its mode of diffusion and its propagation in the passenger compartment are predetermined or obtained directly by the control unit. The control unit can thus directly receive the information concerning the initial sound signal emitted by these known sources of sound emission. The control unit can analyze these initial sound signals as a priority.
    The signal received and transmitted by the reception elements and corresponding to the initial signals emitted by these known sources of sound emission can be used to refine the acoustic model of the passenger compartment.
    The signal received by the reception elements and corresponding to the initial signals emitted by these known sources of sound emission is exploited when the acoustic model is modified, for example by obstacles in the car.
    For other sound sources, not known because they do not belong to the vehicle for example, preferably, the determination of the attenuation sound signal takes into account the initial sound signal received by the receiving element for which this initial sound signal presents the greatest amplitude.
    To this end, the control unit determines whether the determined emission location is located in a predetermined part of the private acoustic zone for which the initial sound signal must be attenuated outside the private acoustic zone. For example, if it is a question of attenuating the voice of passengers outside the private acoustic zone, only the sound signals whose place of emission is located near the head of the passengers are attenuated.
    The determination of the attenuation signal uses, for example, algorithms for attenuation of sound signals known to those skilled in the art. These algorithms take into account the enclosed environment of the passenger compartment whose acoustics, spatial constraints and sound reflections are known and modeled in the passenger compartment acoustic model.
    In general, the attenuation sound signal has an amplitude similar to the amplitude of the initial sound signal and a phase in opposition to that of the initial sound signal, instead of listening to the overall sound signal, that is to say ie at the level of the head of the passengers of the rest of the passenger compartment, outside the private acoustic zone.
    Thus, the phases of the initial sound signal and the attenuation sound signal being in opposition, the overall sound signal resulting from the superposition of these two sound signals, that is to say resulting from the sum of these two signals, presents an amplitude lower than the amplitude of the initial sound signal, that is to say an attenuated amplitude, see canceled.
    More precisely, the attenuation sound signal is equal to the initial sound signal as received by the receiving element for which the amplitude of this initial sound signal is maximum, except that its phase is in opposition with that of this initial sound signal and has a phase delay equal to the distance between the receiving element for which the amplitude of this initial sound signal is maximum and the head of the passenger for whom the initial sound signal is attenuated, divided by the speed of sound in the air. In practice, this phase delay is equal to the distance between the reception element for which the amplitude of this initial sound signal is maximum and the headrest of said passenger, or a control reception element placed in this support. -head.
    As a variant, different phase delays can be taken into account and the attenuation of the initial sound signal can be maximum in other places in the private acoustic zone. For example, the phase delay can be equal to the distance between the receiving element for which the amplitude of this initial sound signal is maximum and the place where the propagation of the initial sound signal and / or its echoes can be attenuated by optimally near the borders of the passenger's private acoustic space for which the sound signal is attenuated, divided by the speed of sound in the air.
    For example, an initial sound signal coming for example from the driver will be attenuated, even canceled, not at a single point which would correspond to the center of the head of the front-left passenger but at the entrance to the private acoustic space of the front passenger -left, right of the armrest for example.
    In general, even if the speakers are optimized to minimize the initial sound signal in the immediate vicinity of a passenger's head, the sound signal will preferably be attenuated where it can best be. Depending on its direction of propagation and the orientation of the speakers in the vehicle, a particular initial sound signal may be attenuated from the armrest, and other sound signals will be attenuated a little closer to the passenger.
    The location of the private acoustic zone where the attenuation of the initial sound signal is optimized depends on the propagation of this initial sound signal and the limits imposed by a reduced number of speakers.
    If the place of emission of the initial sound signal is not located in the predetermined part of the private acoustic zone for which the initial sound signal must be attenuated outside the private acoustic zone, no sound attenuation signal n 'is neither determined nor emitted on the basis of this initial sound signal.
    The control unit is also preferably programmed to determine the main direction of propagation of the initial sound signal.
    This is possible by determining the place of emission and the acoustic model of the passenger compartment.
    For the sake of simplification, the initial sound signal is considered to be simple here. In practice, at a given location in the private acoustic zone, there are several initial sound signals (music, voice, noise, etc.) coming from different sound sources.
    The control unit then controls the emission of the attenuation sound signal by one or more sound emission elements distributed in the passenger compartment and adapted to emit in the area of the passenger compartment located outside the private acoustic area.
    The attenuation sound signal is preferably emitted by the sound emission elements making it possible to emit the attenuation sound signal in a direction of emission close to the direction of propagation of the initial sound signal, in the opposite direction of the propagation of the initial sound signal.
    The control unit is therefore programmed to select the appropriate sound emission element (s).
    For example, to attenuate an initial sound signal propagating in a longitudinal direction from front to rear, the sound attenuation signal is emitted by a transmitting element emitting at least one longitudinal component, from rear to forward.
    The determined attenuation sound signal also takes into account the position of the sound emission element used in step c).
    If several emission elements are used, the determined attenuation sound signal can therefore be different for each sound emission element.
    The initial sound signal, corresponding here for example to the voice of passengers seated in the private acoustic zone, is thus attenuated, or even canceled in at least part of the rest of the passenger compartment, for example at least close to the position of the head at least one passenger when seated in the area of the passenger compartment outside said private acoustic area.
    The position and number of sound emission elements are optimized to provide the best possible attenuation.
    It is advantageous to have a reception element and a sound emission element in the headrest of the private acoustic zone because the attenuation algorithm can thus obtain information on the optimal delay to be applied for the signal. sound attenuation to be determined.
    In particular, it should be mentioned that the attenuation signal in phase opposition calculated to be emitted by each sound emission element, for example each loudspeaker, takes account of the sum of the initial sound signals to be attenuated by this signal. attenuation, taking into account for example an estimate of the propagation and the reflections of the initial sound signals emitted by each initial sound source. Each loudspeaker will therefore emit a global attenuation signal comprising for example a first attenuation signal with a high amplitude in phase opposition with a first initial signal emitted by a first initial source fairly close added to a second signal. attenuation with a low amplitude in phase opposition with a second initial sound signal emitted by a second initial source compensating for yet another (fairly attenuated) reflection of this second sound signal.
    At another location, another speaker will emit a mixture of these first and second attenuation signals, but with different phases and amplitudes. Certain initial sound signals will not be attenuated by this other speaker because they cannot be attenuated by this speaker (for example because of its position relative to the source of these initial sound signals) or not present at this location.
    Each passenger can at any time decide to deactivate the surrounding private acoustic zone, by means similar to those described for activation.
    The device according to the invention makes it possible to attenuate the initial sound signal and its reflections thanks to the reception of all the sound signals by the various reception elements.
    In addition, preferably, the method according to the invention comprises an additional step of monitoring the effectiveness of the attenuation of the initial sound signal. The reception elements arranged outside the private acoustic zone receive the overall sound signal corresponding to the superposition of the initial sound signal and the attenuation sound signal. It is preferably provided that they transmit information to the control unit on this global sound signal, which makes it possible to verify the effectiveness of the attenuation by comparing the amplitude of the global signal and the amplitude of the sound signal. initial. The reception elements are thus used to establish a control loop to best adapt the attenuation algorithm.
    For this purpose, the control unit preferably uses the control reception elements located at the level of the head restraints of the seats not included in the private acoustic zone.
    As mentioned previously, the attenuation sound signal is determined for example by taking into account only or essentially the initial sound signal received by the receiving element which best picks up this signal, that is to say by taking into account the initial sound signal received by the receiving element for which the initial sound signal has the greatest amplitude. As a variant, the determination of the attenuation sound signal takes into account a weighted average of the initial sound signal received by different reception elements.
    The acoustic reflections of this initial sound signal on the walls of the passenger compartment and its repetitions in the passenger compartment are taken into account by the emission of a plurality of attenuation signals, taking into account the propagation times of the reflections and of the acoustic model of the passenger compartment, using an echo cancellation algorithm operating on a sliding time window. Thus, the control unit is programmed to recognize patterns of sounds repeated over time with a decreasing amplitude, and attenuate them, or even cancel them with an appropriate decreasing coefficient.
    A maximum time window is defined to search for these reflections, the duration and the weakening coefficient of which are defined on the basis of the intrinsic characteristics of the vehicle (micro-wall distance, reflection coefficient of the wall, etc.).
    The phase shift and the difference in amplitude of the initial sound signal with its reflections and / or repetition makes it possible to correlate the reality of the acoustic reflections and absorptions with what was expected in the acoustic model of the passenger compartment established for example on the basis of a statistical occupancy model with four passengers. The acoustic model of the passenger compartment can thus be adjusted in real time to take account of these differences, thus making it possible to take into account the occupancy of the passenger compartment and the various obstacles present (people of different sizes, packages, hanging clothes. ..).
    In addition, in order to encourage private discussion between two passengers in the same private acoustic zone, said control unit can also be programmed to determine, as a function of the initial sound signal and its place of emission, a sound signal d amplification or several amplification sound signals, so that each amplification sound signal is in phase with the initial sound signal, that is to say has the same phase, in each part of the private acoustic zone where a passenger listens to this initial sound signal and to control the emission of this amplification sound signal. This selectively amplifies the sound of a passenger's voice for another passenger, or several other passengers.
    In addition, the initial sound signals emitted by certain sound sources such as the multimedia system or the vehicle telephone can, depending on the configuration of the passengers, be broadcast only in certain private acoustic zones, so that the sound signals emitted by these sound sources do not can only be heard by passengers located in the private acoustic zones in which these sound signals are broadcast.
    The device and method according to the invention also allow selective attenuation of the other components of a sound signal, namely in particular the music and the noise of the engine, as described in the example below.
    We will describe in the following an example of implementation of the invention in the interior of the single figure. The device according to the invention here makes it possible to arrange a maximum of four private acoustic zones surrounding each seat 103, 104, 105, 106.
    In this example, the device is programmed to selectively attenuate certain components of the sound signal received in each private acoustic zone.
    The passenger seated in the driver's left front seat 103 wishes to listen to music without being disturbed either by ambient noise or by conversations.
    The passengers seated in the front right seat 104 and in the rear left seat 105, that is to say behind the driver, wish to chat together, without being heard by the other passengers and without being disturbed by the other passengers.
    The passenger seated in the rear right seat 106 wishes to sleep, and therefore hear as little noise as possible.
    Each passenger indicates their wishes to the control unit through the control interface. The device according to the invention is then configured to arrange three private acoustic zones detailed below. Music is generated by a centralized audio player.
    The lateral speakers HP3, HP4 arranged in the headrest 103A of the seat 103 on the left front play music for the passenger in this seat.
    In the private acoustic zone surrounding the passenger seated in the right front seat 104 and that seated in the left rear seat 105: for the passenger in the right front seat 104, the control unit determines a first sound attenuation signal and controls its emission by the front speaker HP2 placed opposite this passenger.
    The first attenuation signal is in phase opposition from the sum of the following signals, which propagate from the back to the front:
    - audio signal received by the rear-facing part of the microphone M1 corresponding to the voice of the passenger seated in the left front seat 103,
    - sound signal received by the microphone M7 and corresponding to the voice of the passenger seated in the rear right seat 105,
    - sound signal emitted by the lateral speakers HP3 and HP4 of the front left seat 103 and corresponding to the music listened to by the passenger seated in this seat,
    - sound signal received by the rear microphone part of the M2 corresponding to the ambient noise.
    These sound signals are attenuated by phase opposition, with a delay equal to the distance between the microphone having received the signal with the greatest amplitude and the microphone placed in the headrest 104A of the right front seat 104, divided by the speed. sound in the air.
    Account is also taken of the residual signals received by the microphone M5 from the headrest 104A of the right front seat 104 after this attenuation. Then added to the first attenuation signal described above, a feedback signal in phase opposition to the sum of the following signals:
    - residual sound signal of the ambient noise detected by the front parts of the microphones M2 and M3 which is reflected on the front wall of the passenger compartment, in particular the windshield, and which is received by the microphone M5 at the instant [t + n] with a weakened amplitude, by using a sliding time window echo cancellation algorithm,
    - any residual sound signal received by a microphone close to the corresponding passenger.
    Obviously, the voice of the passenger in the front right seat 104 is received by the microphone M3 and preserved to allow conversation with the passenger seated in the rear left seat 105.
    In addition, preferably, the sound signals received by the reception elements and corresponding to the voice of the passenger seated in the rear left seat 105 are amplified by their emission by the lateral speakers HP5 and HP6 arranged in the headrest 104A of seat 104 front right.
    The lateral speakers HP5, HP6 then emit an amplification sound signal equal to the sum of the sound signal received by the microphone M6, corresponding to the voice of the left rear passenger, and of a comfort sidetone.
    For more comfort and realism, the side speaker HP5 located to the right of the headrest 104A can emit the sound signal received by the microphone M6 slightly louder than the side speaker HP6 located to the left of the 104A headrest, to spatialize the sound. The sidetone corresponds to a sound signal returning from the voice of the passenger in the front right seat 104, so it is the sound signal received by the weakened M3 microphone. It is emitted by the two side speakers HP5, HP6 with the same amplitude.
    In addition, one or the other or the two lateral speakers HP5, HP6 can participate in the sound attenuation by emitting a second attenuation signal in phase opposition to the sound signal corresponding to the ambient noise received by the parties. forward-facing M3 and M2 microphones. These loudspeakers are used to attenuate the components of the initial sound signal propagating from front to back.
    The attenuation coefficients and delays applied for the attenuation of the selected sound signals are reassessed in real time to eliminate the residual sound signals received by the M5 microphone placed in the headrest 104A of the right front seat. Generally speaking, each microphone identifying sound signals close to the passenger is taken into account to refine the feedback signal.
    For the passenger seated in the left rear seat: the control unit determines a third attenuation signal emitted by the rear speaker HP7 placed opposite the left rear seat, which is in phase opposition to the sum of the sound signals correspond to ambient noise from the rear and reflections on the rear wall of the vehicle, namely
    - the sound signal received by the rear-facing part of the M8 microphone, and
    - audio signal received by the rear-facing part of the M10 microphone.
    For the reduction of these noises, a joint contribution from the speakers HP7, HP8 arranged in the front seats towards the rear of the passenger compartment can be used.
    The voice of the passenger seated on the seat 105 on the left, received by the microphone M6, is preserved.
    The control unit also controls the emission by the lateral speakers HP9 and HP10 arranged in the headrest 105A of the seat 105 of a fourth attenuation signal.
    Here, the fourth attenuation signal determined by the control unit comprises a signal in phase opposition from the sum of the following signals:
    - audio signal received by the rear-facing part of the microphone M1 corresponding to the voice of the passenger seated in the left front seat 103,
    - sound signal received by the microphone M7 and corresponding to the voice of the passenger seated on the seat 105 on the right,
    - sound signal emitted by the lateral speakers of the left front seat HP3 and HP4 and corresponding to the music listened to by the passenger seated in the left front seat,
    - the sound signal received by the forward-facing part of the M8 microphone, and
    - sound signal received by the front-facing part of the M10 microphone.
    These sound signals are attenuated by phase opposition, with a delay equal to the distance between the microphone having received the signal with the greatest amplitude and the microphone placed in the headrest 105A of the rear left seat 105, divided by the speed. sound in the air.
    Account is also taken of the residual signals received by the microphone M9 of the headrest 105A after this attenuation.
    The M9 microphone placed in the headrest of the rear left seat 105 is in fact used to detect residues of ambient noise, making it possible to assess whether this ambient noise is correctly attenuated. Depending on the place where the sound signal to be attenuated is emitted, the fourth attenuation signal is emitted by one or other of the side speakers HP9, HP 10, or both.
    Then added to the fourth attenuation signal described above, a feedback signal in phase opposition to the sum of the following signals:
    - residual sound signal of the ambient noise which is reflected on the front and / or rear walls of the passenger compartment, in particular the windscreen, and which is received by the microphone M9 at the instant [t + n] with a weakened amplitude , by using an echo cancellation algorithm,
    - any residual sound signal received by a microphone close to the corresponding passenger.
    The lateral speakers HP9, HP10 also emit an amplification sound signal equal to the sum of the sound signal received by the microphone M6 and corresponding to the voice of the left rear passenger and a comfort sidetone.
    For the driver listening to music:
    The control unit determines a fifth attenuation signal which is emitted by the front speaker HP1, which is in phase opposition with the sum of the following signals:
    - audio signal received by the rear-facing part of the microphone M3 corresponding to the voice of the passenger seated in the seat 104, front right,
    - sound signal received by the microphone M6 and corresponding to the voice of the passenger seated in the rear left seat 105,
    - sound signal received by the microphone M7 and corresponding to the voice of the passenger seated in the rear right seat 106,
    - sound signal received by the rear microphone part of the M2 corresponding to the ambient noise.
    To determine the attenuation signal, a delay is applied to each sound signal taken into account. This delay is equal to the distance between each microphone and the M4 microphone placed in the headrest 104 of the left front seat, divided by the speed of sound. An additional phase and amplitude correction can be applied, taking into account the acoustics of the passenger compartment and in particular the obstacles between the microphone receiving the sound signal or the speaker emitting the attenuation signal and the passenger.
    As previously, the residual sound signals received by the microphone M4 located in the headrest of the left front seat, namely in particular the residual sound signal of the ambient noise reflected by the front wall of the passenger compartment, and which is received by the microphone M4 at time [t + n] with a lower amplitude than that of ambient noise are also taken into account in determining the attenuation signal.
    The control unit also controls the emission through the side speakers HP3 and HP4 located in the headrest of the left front seat of a sixth attenuation signal in addition to the music played. This sixth attenuation signal attenuates ambient noise as well as residual sound signals.
    The lateral speakers HP3 and HP4 compensate for residual sound signals which are not completely longitudinal. In the case of a car, these compensations are essentially limited to the reflections of noises on the walls of the vehicle.
    For the passenger in the rear right seat, who sleeps:
    The rear speaker HP8 placed opposite this passage emits a seventh attenuation signal in phase opposition from the sum of the following signals:
    - sound signal received by the microphone M6 corresponding to the voice of the passenger in the seat on the left,
    - sound signal received by the rear-facing part of the M12 microphone corresponding to the ambient noise,
    - sound signal received by the rear-facing part of the M10 microphone corresponding to ambient noise and sound reflections on the rear wall of the passenger compartment. To reduce these noises, a joint contribution from the lateral speakers HP7 and HP8, located opposite the seats in the seat, will be used.
    The control unit also determines a ninth attenuation signal emitted by the side speakers HP11 and HP12 located in the headrest 105B in the rear right seat of the bench seat 105.
    It is a signal in phase opposition from the sum of the following signals:
    - sound signal received by the microphones M1, M3 corresponding to the voice of the other passengers,
    - sound signal corresponding to the music played by the lateral speakers HP3 and HP4 located in the headrest of the front left seat,
    - sound signal received by the microphones M10 and M12 (front part) corresponding to the ambient noise, each with a delay equal to the distance between the microphone receiving this signal with the greatest amplitude and the microphone M11 located in the headrest 106A rear right seat 106 divided by the speed of sound in air.
    To this is added a tenth attenuation signal determined in phase opposition with the residual ambient noise reflected by the front and rear walls, received at times t + n offset with a weakened amplitude, by using an algorithm of echo cancellation.
    According to another example, two private acoustic zones are provided: a front zone including the two front seats and a rear zone comprising the rear bench seat. In the case of a taxi, the two zones can be considered as "private acoustic zone", the front zone to ensure the confidentiality of the driver and the rear zone to ensure the confidentiality of passengers.
    Similarly, in the context of family use, the front zone (the driver and his front passenger) would be considered as a "private acoustic zone" with regard to the rear passengers. In this example, the radio or media player is turned on.
    When the driver wishes to have a private conversation with the front passenger, he configures the front zone into a "private acoustic zone", either by using a button or by using the keyword "private" if the car is equipped with a system. voice recognition.
    The microphones in the entertainment system then receive the audio signals emitted in the car. These signals include sounds inside the car, radio sounds from the entertainment system, and conversations between passengers.
    The device and method according to the invention make it possible to create private acoustic zones, in particular for conversations between two or three passengers.
    They also make it possible to broadcast music or audio content (for example a telephone conversation) selectively to each passenger, that the others will not hear and to reduce ambient noise, in particular engine noise.
    In the event of an emergency (emergency braking, shock, triggering of an air bag, warning cry from a user), the device can be automatically deactivated for safety reasons.
    One can consider the use of head restraints incorporating directional speakers close to the ears of the passengers, arranged in wings of the head rest folded on either side of the passenger head.
    Finally, in order to achieve a better attenuation of the desired sound signals, the attenuation signal intended to attenuate a given initial sound signal, can be emitted by using at least two speakers. A beamforming technique is then preferably used to better center the cancellation of sound at the level of the passengers' heads. This technique is known to those skilled in the art and will not be described in more detail here. In order to determine the target of the beamforming, here for example the passenger's head, a camera could be used to track the passenger's face and thus determine the position of the passenger's head in the private acoustic zone.
    For the front passengers of the vehicle, there is then provided for example a camera arranged in the middle of the windshield, for example on the central rear view mirror, and two speakers arranged opposite each front seat, ie a total of four front speakers oriented towards the rear of the vehicle and distributed along the dashboard of the vehicle.
    权利要求:
    Claims (11)
    [1" id="c-fr-0001]
    1. Device for fitting out at least one private acoustic zone in the passenger compartment of a vehicle, comprising:
    - a plurality of reception elements (M1, M2, M3, M4, M5, M6, M7, M8, M9, M10, M11, M12) of at least one initial sound signal, distributed in the passenger compartment of the vehicle,
    - at least one sound emission element (HP1, HP2, HP3, HP3, HP4, HP5, HP6, HP7, HP8, HP9, HP10, HP10, HP11, HP12) adapted to emit an attenuation sound signal in a zone from the exterior cabin to the first private acoustic zone, and
    - a control unit programmed for
    a) receive and process information relating to each initial sound signal transmitted by said reception elements (M1, M2, M3, M4, M5, M6, M7, M8, M9, M10, M11, M12), to identify a place of emission of this initial sound signal,
    b) determine, as a function of each initial sound signal and its place of emission, said sound attenuation signal so that, in at least part of the area of the passenger compartment outside the private acoustic area, the amplitude of the overall sound signal resulting from the superimposition of each initial sound signal and the attenuation sound signal is less than the amplitude of said initial sound signal and
    c) controlling the emission of this attenuation sound signal by said at least one sound emission element (HP1, HP2, HP3, HP3, HP4, HP5, HP6, HP7, HP8, HP9, HP10, HP10, HP11, HP12).
    [2" id="c-fr-0002]
    2. Device according to claim 1, in which in step a), the control unit is also programmed to determine a direction of propagation of each initial sound signal.
    [3" id="c-fr-0003]
    3. Device according to one of claims 1 and 2, wherein said control unit is programmed to compare, in step a), the information relating to each initial sound signal transmitted by each receiving element of said plurality of reception elements (M1, M2, M3, M4, M5, M6, M7, M8, M9, M10, M11, M12) to deduce the place of emission of this initial sound signal.
    [4" id="c-fr-0004]
    4. Device according to one of claims 1 to 3, wherein said information relating to each initial sound signal comprises at least its phase and / or its time delay and / or its amplitude.
    [5" id="c-fr-0005]
    5. Device according to one of claims 1 to 4, wherein, said control unit is programmed to determine, in step b), the attenuation sound signal so that the phase of this sound signal d attenuation is in phase opposition with respect to the sum of each initial sound signal in said part of the area of the passenger compartment outside the private acoustic area.
    [6" id="c-fr-0006]
    6. Device according to claim 2, in which a plurality of sound emission elements are provided, and in which the control unit is programmed to, in step c), control the emission of the sound signal d attenuation by a part of the plurality of sound emission elements determined as a function of the direction of propagation of each initial sound signal.
    [7" id="c-fr-0007]
    7. Device according to one of claims 1 to 6, wherein the control unit is programmed to, in step c), control the emission of the attenuation sound signal intended to attenuate the same initial sound signal by at least two sound emission elements.
    [8" id="c-fr-0008]
    8. Device according to one of the preceding claims, in which said control unit is also programmed to determine, as a function of the initial sound signal and its place of emission, an amplification sound signal so that this amplification sound signal is in phase with the initial sound signal in a part of the private acoustic zone and for controlling the emission of this amplification sound signal.
    [9" id="c-fr-0009]
    9. Device according to one of the preceding claims, for the arrangement of a plurality of private acoustic zones in the passenger compartment of the vehicle, comprising said private acoustic zone and at least one additional private acoustic zone, in which it is provided in the minus one sound emission element (HP1, HP2, HP3, HP3, HP4, HP5, HP6, HP7, HP8, HP9, HP10, HP10, HP11, HP12) of an additional attenuation sound signal in a zone of the passenger compartment outside the additional private acoustic zone, and in which said control unit is programmed to, in step b), determine, as a function of each initial sound signal and its place of emission, said sound signal d additional attenuation so that, in the area of the passenger compartment outside the additional private acoustic zone, the amplitude of the overall sound signal resulting from the superposition of each initial sound signal and the additional attenuation sound signal is less than the amplitude of said initial sound signal and, in step c), command the emission of this additional attenuation sound signal by said sound emission element (HP1, HP2, HP3 , HP3, HP4, HP5, HP6, HP7, HP8, HP9, HP10, HP10, HP11, HP12) additional.
    [10" id="c-fr-0010]
    10. Method for fitting out at least one private acoustic zone in the passenger compartment of a vehicle, comprising the following steps:
    - reception of at least one initial sound signal by a plurality of reception elements (M1, M2, M3, M4, M5, M6, M7, M8, M9, M10, M11, M12),
    - determination of the place of emission of each initial sound signal,
    - Determination, as a function of each initial sound signal and of its place of emission, of an attenuation sound signal such that, in at least part of the area of the passenger compartment outside the private acoustic area, the amplitude of the overall sound signal resulting from the superimposition of each initial sound signal and the attenuation sound signal is less than the amplitude of said initial sound signal and
    - emission of this attenuation sound signal in the area of the passenger compartment outside the private acoustic area.
    [11" id="c-fr-0011]
    11. Motor vehicle comprising at least one device according to one of the preceding claims, providing at least one private acoustic zone in the passenger compartment of the vehicle.
    1/1
    Single figure
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    同族专利:
    公开号 | 公开日
    FR3078931B1|2021-01-15|
    WO2019175347A1|2019-09-19|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP3040984A1|2015-01-02|2016-07-06|Harman Becker Automotive Systems GmbH|Sound zone arrangement with zonewise speech suppression|
    US20160284337A1|2015-03-24|2016-09-29|Honda Motor Co., Ltd.|Active noise reduction system, and vehicular active noise reduction system|
    GB2546632A|2016-01-25|2017-07-26|Ford Global Tech Llc|System and method for personalized sound isolation in vehilce audio zones|FR3111005A1|2020-06-02|2021-12-03|Renault|SOUND VOLUME CONTROL PROCESS|
    DE102020111224A1|2020-04-24|2021-10-28|Audi Aktiengesellschaft|System for providing sound zones in a vehicle|
    法律状态:
    2019-03-22| PLFP| Fee payment|Year of fee payment: 2 |
    2019-09-20| PLSC| Search report ready|Effective date: 20190920 |
    2020-03-19| PLFP| Fee payment|Year of fee payment: 3 |
    2021-03-23| PLFP| Fee payment|Year of fee payment: 4 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1852201A|FR3078931B1|2018-03-14|2018-03-14|DEVICE AND PROCEDURE FOR FITTING AT LEAST ONE PRIVATE ACOUSTIC ZONE IN THE PASSENGER COMPARTMENT OF A VEHICLE|
    FR1852201|2018-03-14|FR1852201A| FR3078931B1|2018-03-14|2018-03-14|DEVICE AND PROCEDURE FOR FITTING AT LEAST ONE PRIVATE ACOUSTIC ZONE IN THE PASSENGER COMPARTMENT OF A VEHICLE|
    PCT/EP2019/056484| WO2019175347A1|2018-03-14|2019-03-14|Device and method for defining at least one private acoustic area in the passenger compartment of a vehicle|
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