• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Disclosed is an apparatus and method for creating an acoustic noise barrier to prevent eavesdropping via a mobile device (120). The apparatus comprises an enclosure (102, 200) comprising a closing mechanism (204a, 204b); a low frequency signal generator (104) within the enclosure; an amplifier (106) within the enclosure, communicatively coupled to the low frequency signal generator; an electromechanical resonance element (108) communicatively coupled to the amplifier; an internal light sensor (110) for detecting light within the enclosure; a mute switch circuit (112) communicatively coupled to the closing mechanism of the enclosure; and at least one of an external light source (114) in communication with an outer surface of the enclosure, communicatively coupled with the internal light sensor and an external sound source (116) in communication with an outer surface of the enclosure and communicatively coupled with the internal light sensor.
    公开号:FI20195078A1
    申请号:FI20195078
    申请日:2019-02-06
    公开日:2020-08-07
    发明作者:Iiro Vuorela；Jukka Seittenranta；Alex Björklund
    申请人:Novosec Oy；
    IPC主号:
    专利说明:

    APPARATUS AND METHOD FOR CREATING ACOUSTIC NOISE BARRIER TOPREVENT EAVESDROPPING VIA MOBILE DEVICE
    TECHNICAL FIELD The present invention is generally related to acoustic noise barrier, more particularly, to an apparatus and method for creating an acoustic noise barrier to prevent eavesdropping via a mobile device.
    BACKGROUND Typically, mobile devices are necessary communication devices for individuals. While bringing convenience to lives and work, the mobile devices also bring hidden dangers of security and confidentiality. Places like offices, laboratories, conference rooms, and other secure spaces often require security and confidentiality, but as long as a spy software is installed in the mobile device, the mobile device can be used as a remote listening device to eavesdrop. The spy software enables a hacker to listen to space through mobile devices by knocking the microphone or camera on the mobile device and allow the hacker to become aware of things in the physical environment of the user such as confidential information about conversations. Some public organizations, such as the Defense Forces, have = for a long time been protected against the aforementioned threats by N 20 imposing potential visitors to leave mobile devices in cabinets outside the
    O © room. E Document US 20110198245 discloses a box which produces white noise to co prevent the mobile devices within it from picking sounds from the 3 surrounding area. The mobile phone security masking box disclosed S 25 provides a countermeasure against the vulnerability of subjecting confidential and private conversations being picked and recorded by cellularor mobile wireless devices, and yet allows alerting of incoming calls and visual identification of caller ID to allow the conversation to be interrupted and the required phone call or message responded to. However, the box utilizes acoustical noise masking circuitry arranged within the isolated portion of the interior of the box which is not an effective technique to secure space from the hacker to listen to space through mobile devices. Document CN 104144601 discloses a device for preventing hacking through a mobile phone. The device comprises a sound shielding device, a voice interfering module and a mobile phone call inducting module. The sound shielding device is used for shielding the mobile phone. The voice interfering module is located in the sound shielding device and used for continuously and repeatedly playing noise synthesized by various sounds including voice, and the mobile phone call inducting module is arranged outside the sound shielding device and sends out a warning when the mobile phone receives calls or short messages or notice. However, the sound shielding device is not secure because it may capture the sound of the surrounding and process the sound into a non-hearable sound. Therefore, there is a need for an apparatus and method to effectively prevent the use of mobile phone for eavesdropping. Further, there is a need > 20 for an efficient and effective apparatus and method for creating an acoustic > noise barrier to prevent eavesdropping via a mobile device. Thus, in view of N the above, there is a long-felt need in the industry to address the O aforementioned deficiencies and inadeguacies.E SUMMARY OF THE INVENTION
    R 3 25 An apparatus and a method for creating an acoustic noise barrier to prevent > eavesdropping via a mobile device are described in the enclosed claims.
    The apparatus typically comprises - an enclosure comprising a closing mechanism; - a low frequency signal generator within the enclosure; - an amplifier within the enclosure, communicatively coupled to the low frequency signal generator; - an electromechanical resonance element communicatively coupled to the amplifier and configured to - produce a mechanical vibration inside the enclosure, - transmit the mechanical vibration into a wall material of the enclosure, and - make the wall material of the enclosure to resonate; - an internal light sensor for detecting light within the enclosure; - a mute switch circuit communicatively coupled to the closing mechanism of the enclosure; and - at least one of - an external light source in communication with an outer surface of the enclosure, communicatively coupled with the internal light sensor; -an external sound source in communication with an outer surface of the enclosure and communicatively coupled with the internal light sensor.
    O A typical method for creating an acoustic noise barrier to prevent N eavesdropping via a mobile device, wherein the mobile device is arranged S in an enclosure, enclosure is being closable by a closing mechanism, the S method comprising steps of E 25 - producing a mechanical vibration within the enclosure; and S - generating resonation in the walls of the enclosure with the produced 3 mechanical vibration to cover a sound coming from outside of the enclosure NN to a microphone of the mobile device.
    One advantage of the present invention is that it does not utilize any component or functional units to listen to the conversation and process the sound into a non-hearable one. A further advantage of the present invention is that it allows the mobile devices to be in the same place/room as their holders so that the holder can be reached when needed and that the holder can hear/see any incoming calls. Another advantage of the present invention is that it is a portable and a battery-backed industrial case that prevents possible eavesdropping via a mobile device that includes microphone and the radio communication equipment.
    These features and advantages of the present disclosure may be appreciated by reviewing the following description of the present disclosure, along with the accompanying figures wherein like reference numerals refer to like parts.
    BRIEF DESCRIPTION OF DRAWINGS The accompanying drawings illustrate the embodiments of apparatus, methods, and other aspects of the disclosure. Any person with ordinary skills in the art will appreciate that the illustrated element boundaries (e.g., boxes, groups of boxes, or other shapes) in the figures represent an example of the boundaries. In some examples, one element may be > 20 designed as multiple elements, or multiple elements may be designed as N one element. In some examples, an element shown as an internal 2 component of one element may be implemented as an external component 7 in another and vice versa. Furthermore, the elements may not be drawn to & scale. Various embodiments will hereinafter be described in accordance with S 25 the appended drawings, which are provided to illustrate, not limit, the scope, 3 wherein similar designations denote similar elements, and in which:ON
    FIG. 1 illustrates a block diagram of the present apparatus for creating an acoustic noise barrier to prevent eavesdropping via a mobile device, in accordance with an embodiment. FIG. 2 illustrates an exemplary view of the enclosure, in accordance with an 5 embodiment. FIG. 3 illustrates an operational block diagram of the present apparatus for creating an acoustic noise barrier to prevent eavesdropping via a mobile device, in accordance with an embodiment. FIG. 4 illustrates a flowchart of the present method for creating an acoustic noise barrier to prevent eavesdropping via a mobile device, in accordance with an embodiment.
    DETAILED DESCRIPTION OF THE INVENTION References to "one embodiment,” "at least one embodiment,” "an embodiment,” “one example,” “an example,” “for example,” and so on indicate that the embodiment(s) or example(s) may include a particular feature, structure, characteristic, property, element, or limitation but that not every embodiment or example necessarily includes that particular feature, structure, characteristic, property, element, or limitation. Further, = repeated use of the phrase "in an embodiment” does not necessarily refer N 20 tothe same embodiment. <Q S Methods of the present invention may be implemented by performing or E completing manually, automatically, or a combination thereof, selected co steps or tasks. The term "method” refers to manners, means, technigues 3 and procedures for accomplishing a given task including, but not limited to, S 25 those manners, means, technigues, and procedures either known to, or readily developed from known manners, means, technigues and proceduresby practitioners of the art to which the invention belongs.
    The descriptions, examples, methods, and materials presented in the claims and the specification are not to be construed as limiting but rather as illustrative only.
    Those skilled in the art will envision many other possible variations within the scope of the technology described herein.
    Embodiments described in connection with the apparatus apply mutatis mutandis to the method and vice versa.
    The apparatus for creating an acoustic noise barrier to prevent eavesdropping via a mobile device typically comprises - an enclosure comprising a closing mechanism; - a low frequency signal generator within the enclosure; - an amplifier within the enclosure, communicatively coupled to the low frequency signal generator; - an electromechanical resonance element communicatively coupled to the amplifier and configured to - produce a mechanical vibration inside the enclosure, - transmit the mechanical vibration into a wall material of the enclosure, and - make the wall material of the enclosure to resonate; > 20 - an internal light sensor for detecting light within the enclosure; > - a mute switch circuit communicatively coupled to the closing mechanism N of the enclosure; and O - at least one of = - an external light source in communication with an outer surface of N 25 the enclosure, communicatively coupled with the internal light sensor; S -an external sound source in communication with an outer surface of = the enclosure and communicatively coupled with the internal light - sensor.
    Examples of the mobile device include, but are not limited to, a personal computer, a laptop, a personal digital assistant (PDA), a mobile phone, a tablet, or any other mobile communication device.
    The enclosure utilizes a noise barrier technology to generate a broadband random noise inside the enclosure and lead it into a wall material of the enclosure, making it to resonate and block all the external speech information coming into the enclosure from outside (room etc.), i.e., eliminating eavesdropping with an overwhelming noise in the enclosure.
    The noise barrier vibration on the wall material of the enclosure covers all the sound coming into the enclosure from outside of the enclosure, such as from the room.
    The present enclosure has a built-in battery and utilizes noise barrier technology to block the listening of the mobile devices and hence blocks all the eavesdropping and important secret discussions leakage.
    The noise generated in the enclosure is random in its profile, so its filtering is not possible.
    However, the ringing of the mobile device is indicated by a light and/or by sound, e.g., during incoming call/message.
    The enclosure can also be airproof and/or waterproof.
    The low freguency signal generator is arranged within the enclosure and can be integrated therein.
    In an embodiment, the low freguency signal generator > 20 is a random noise signal generator.
    The low frequency signal generator > produces broadband random noise that generates intense noise in the N enclosure that overdrives a microphone of a listening device to be O inaccurate, or in the absence of adjustment, overdrives the microphone = amplifier of the listening device, distorting the sound so that it becomes N 25 unrecognizable.
    Outside the enclosure, however, the low frequency signal S generator can be heard to produce only a low background noise indicating = that the noise barrier (low freguency signal generator) is in active mode, if - so wished.
    The low frequency signal generator can be a random noise generator, preferably a digital low frequency signal generator.
    The amplifier may be a power amplifier, preferably digital, such as a D-class amplifier.
    The generated mechanical vibration signal (e.g., random noise signal) is transmitted through the power amplifier to an electromechanical resonance element (electromechanical frame-tone element), that makes the portfolio material of the enclosure vibrating creating an active noise barrier.
    Its vibration is multiple in comparison to the sound coming from the outside, caused by a speech in the room for example, thus effectively preventing external sound from entering the enclosure.
    Simultaneously within the enclosure, there may be a generated low frequency signal (e.g., broadband random noise) that prevents the detection of external audio information.
    The resonance element may be for example a resonance vibration speaker that resonates the wall of the enclosure, making the sound coming outside unrecognizable and thus preventing external sound from a room entering into the enclosure, and a generated low frequency signal within the enclosure (e.g., random noise) covering the sound coming from outside of the enclosure to the microphone of the device/phone in the enclosure.
    The low frequency signal generated within the enclosure (e.g. random noise) > 20 can vary between 20 Hz - 20 kHz with typical signal levels between 40-60 > dB or 20 dB lower than the sound level outside the enclosure.
    As a reference, N people speaking loudly, e.g., in a meeting, generate max 80 dB sound level, O i.e., max 60 dB noise barrier generated in the enclosure will work.
    E The amplifier is within the enclosure and communicatively coupled to the S 25 low frequency signal generator.
    The electromechanical resonance element 3 is communicatively coupled to the amplifier and configured to produce a N mechanical vibration inside the enclosure, transmit the mechanical vibrationinto a wall material of the enclosure, and enable the wall material of the enclosure to resonate. The internal light sensor is configured to detect light within the enclosure and either the external light source, the external sound source or both are switched on to indicate an incoming call and/or message in the mobile device arranged within the enclosure, when the internal light sensor detects light. The internal light sensor thus detects light in the enclosure (from a mobile device) when the mobile device has an incoming call/ message and thus the display is switched on. Further, the detected light may optionally be amplified by using an ambient light amplifier and transmitted to a rectifier and comparator for further processing. Additionally, the present apparatus may include a sensor to indicate phone vibration in the case when a mobile device has an incoming call/message. According to an embodiment, when the internal light sensor is communicatively coupled to the closing mechanism, the apparatus is configured to - detect that the closing mechanism of the enclosure is closed; - detect light within the enclosure; and - switch on the external light source and/or switch on the external sound > 20 source to indicate an incoming call and/or message in the mobile device N arranged within the enclosure.
    O © The mute switch circuit is communicatively coupled to the closing E mechanism of the enclosure, to indicate if the enclosure is closed or open. 0 In an embodiment, the mute switch circuit is configured to switch off the 3 25 mechanical vibration when the closing mechanism of the enclosure is > opened. The mute switch circuit further switches on the mechanical vibration when the closing mechanism of the enclosure is closed. The mute switchcircuit is thus connected to the power amplifier or to a low frequency signal generator to mute the noise barrier when the enclosure is opened or switched off. When the closing mechanism of the enclosure is opened the generated mechanical vibration is switched off within the enclosure either by switching off the low frequency signal source (e.g., a random noise generator) or the power amplifier. In an embodiment, the mute switch circuit is configured to switch off the amplifier when the closing mechanism of the enclosure is opened and switch on the amplifier when the closing mechanism of the enclosure is closed. In yet another embodiment, the mute switch circuit is configured to switch off the low frequency signal generator when the closing mechanism of the enclosure is opened and switch on the low frequency signal generator when the closing mechanism of the enclosure is closed. The external light source, when used, is in communication with an outer surface of the enclosure and communicatively coupled with the internal light sensor. In an embodiment, the external light source is selected from a lamp, a light emitting diode (LED), a metal-halide lamp, an incandescent bulb, a compact fluorescent lamp (CFL) or it may be a combination thereof. > The external sound source, when used, is in communication with an outer I 20 surface of the enclosure and communicatively coupled with the internal light N sensor. In an embodiment, the external sound source is selected from at a © buzzer, a speaker, a bell or can be a combination thereof. Indeed, the E external sound source can be for example a mechanical, electromechanical 0 or a piezoelectric buzzer.
    D > 25 The apparatus may comprise a back-up battery, a battery charger and a N battery charger control circuit. The back-up battery can be a lead acidbattery if it is required by the security officials to be able to get the noise barrier enclosure into the airplane, i.e. in all conditions.
    The battery charger and control circuit are typically arranged to energize the back-up battery by receiving electrical energy from a switching power supply and to monitor the level of energy provided to the apparatus, if need be using the back-up battery.
    According to an embodiment, the present apparatus may include an audio level meter on the outer surface of the enclosure to measure the environmental sound level where the noise barrier enclosure is located.
    The measured outside environmental sound level information is fed inside to enclosure to adjust the mechanical vibration signal level (generated in the low frequency source, and amplified in the amplifier) to a higher or lower level depending on the measured sound level outside of the enclosure.
    The maximum sound level within the enclosure is for example 20 dB lower than the sound level outside the enclosure.
    In an embodiment, the present apparatus may include a semipermeable mirror film (so that cameras of the mobile devices under protection cannot see outside the enclosure) on the cover of the enclosure to be able to see from the outside of the enclosure an incoming call or message on a mobile > 20 device (light on) under protection.
    N In another embodiment, the present apparatus may include a fish-lens 2 camera and a display on the cover of the enclosure to be able to see from 7 the outside of the enclosure an incoming call or message on a mobile device E (light on) under protection.
    In a further embodiment, the present apparatus S 25 may include a filter circuitry after a low freguency signal generator (a 3 (white) noise generator) wherein the characteristics of the filter can be N varied.
    In an aspect, the internal light sensor may be communicatively coupled to the closing mechanism.
    Thus, when no light is sensed by the internal light sensor, the apparatus detects that the enclosure is closed.
    However, in such a case the apparatus preferably comprises at least two light sensors.
    A first light sensor would be arranged at the openable edge of the enclosure, while a second light sensor would be arranged at an opposite end of the enclosure (inside the enclosure). Both the first and second light sensors can be used to detect an incoming call or message.
    The first sensor can be used to detect opening of the enclosure, as in such a case the first sensor would receive a higher amount of light than the second sensor.
    The difference in the received amounts of light by the two sensors can also be used to calculate the speed of opening of the enclosure.
    A typical method for creating an acoustic noise barrier to prevent eavesdropping via a mobile device, wherein the mobile device is arranged in an enclosure, enclosure is being closable by a closing mechanism, the method comprising steps of - producing a mechanical vibration within the enclosure; and - generating resonation in the walls of the enclosure with the produced mechanical vibration to cover a sound coming from outside of the enclosure to a microphone of the mobile device. o > The method naturally comprises also the step of arranging the mobile device N in the enclosure and closing the enclosure with the closure mechanism.
    As O the apparatus (as described above) detects that the closure mechanism is = closed, it starts generating resonation in the walls of the enclosure.
    In an o 25 embodiment, the frequency of the produced low frequency is varied 3 randomly. &
    The enclosure may comprise a mute switch circuit communicatively coupled to the closing mechanism of the enclosure, in which case the method comprises the mute switch circuit switching off the mechanical vibration when the closing mechanism of the enclosure is opened and switching on the mechanical vibration when the closing mechanism of the enclosure is closed. In an embodiment, the enclosure further comprises an internal light sensor communicatively coupled to the closing mechanism. In this case, the method comprises detecting that the closing mechanism of the enclosure is closed, detecting light within the enclosure and switching on an external light source and/or switching on the external sound source in connection with an outside surface of the enclosure, to indicate an incoming call and/or message in the mobile device arranged within the enclosure. In operation, sound (speech) produced by humans in the room causes the wall of the enclosure to oscillate which transfers the attenuated sound (by the wall material of the enclosure) from the room into the enclosure. With a small amount of energy, a wideband mechanical vibration (noise barrier) is produced on the wall of the enclosure that begins to resonate and thus covers the sound coming from outside of the enclosure to the microphone > 20 of the mobile device making sound unrecognizable. N The natural oscillation of the enclosure wall material can be utilized by 2 injecting low freguency, e.g., broadband random noise into it that causes 7 the material to oscillate and that way it produces a noise barrier inside the E enclosure. The noise barrier must be bigger (resonating low freguency level) S 25 than the sound coming from outside. However, there is no need to limit the 3 level or frequency of the noise barrier.ON
    The present apparatus neither receives nor records in any way a sound coming from outside of the enclosure or use it. The mobile device having microphone and radio communication equipment is typically put in the noise barrier enclosure in a power-on state. The enclosure is closed and the noise barrier is activated automatically. It is also possible to activate the noise barrier manually, using an on/off-switch. In case there is a call/message into the mobile device in the enclosure there is a light and/or sound indication on the outside of the enclosure. When the enclosure is opened the noise barrier is de-activated automatically. The noise barrier does not try to prevent listening through the mobile device, but to make sure that the mobile device cannot hear anything, e.g., conversation in the room. On the other hand, normal functionality of the mobile device is allowed at all times, i.e., the reachability of a mobile device owner is made possible. Thus, the present apparatus and method provides a portable and a battery- backed industrial case that prevents possible eavesdropping via a mobile device, while at the same time an owner of the mobile device can hear a mobile device ringing or seeing a light indicator indicating an incoming call/connection request (message). > 20 It will be apparent to those skilled in the art that various modifications and N variations can be made to the present invention without departing from the 2 spirit and scope of the invention. There is no intention to limit the invention 7 to the specific form or forms enclosed. On the contrary, the intention is to E cover all modifications, alternative constructions, and equivalents falling S 25 within the spirit and scope of the invention, as defined in the appended 3 claims. Thus, it is intended that the present invention cover theO
    Nmodifications and variations of this invention, provided they are within the scope of the appended claims and their equivalents.
    DETAILED DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates a block diagram of the present apparatus for creating an acoustic noise barrier to prevent eavesdropping via a mobile device 120, in accordance with an embodiment. The apparatus comprises an enclosure 102, a low frequency signal generator 104, an amplifier 106, an electromechanical resonance element 108, an internal light sensor 110, a mute switch circuit 112, an external light source 114, and an external sound source 116. The enclosure 102 comprises a closing mechanism 118. Further, the enclosure 102 comprises a wall material 126, a back-up battery 122, a battery charger 124 and a battery charger control circuit 128. FIG. 2 illustrates an enclosure 200, in accordance with an embodiment. The enclosure 200 has the shape and size of a briefcase with a handle 202 and a closing mechanism 204a, 204b. FIG. 3 illustrates an operational block diagram 300 of the present apparatus for creating an acoustic noise barrier to prevent eavesdropping via a mobile device, in accordance with an embodiment. A low frequency signal generator > 104 is communicatively coupled to an amplifier 106, which in turn is > 20 communicatively coupled with a resonance vibration speaker 301 that N resonates a wall of the enclosure. The amplifier 106 is also communicatively © coupled to a mute switch circuit 112, which is in turn communicatively E coupled to an internal light amplifier 302. Further, the micro switch circuit - 112 is coupled to a closing mechanism of the enclosure, to indicate if the 3 25 enclosure is closed or open. The internal light amplifier 302 receives > information from an internal light detector 110, when the latter detects light 308, coming from the mobile device.
    The detected light is amplified by using the internal light amplifier 302 and transmitted to the rectifier and comparator 304 for further processing.
    In this embodiment, the apparatus comprises an external light source 114 on the outer surface of the enclosure to indicate incoming call/ message of the mobile device in the enclosure with a light signal.
    The apparatus comprises also an external sound source 116 to indicate an incoming call/message of a mobile device in the enclosure with a sound.
    The apparatus also comprises a battery charger and control circuit 128 connected to the internal light amplifier (and via it or directly to the other power requiring components of the apparatus). The battery charger and control circuit 128 also energizes the back-up battery 122 by receiving the electrical energy from a power supply 306 and monitors the level of energy provided to the apparatus.
    FIG. 4 illustrates a flowchart 400 of the present method for creating an acoustic noise barrier to prevent eavesdropping via a mobile device, in accordance with an embodiment.
    The method comprises a step 402 of arranging the mobile device in an enclosure and closing the enclosure.
    In step 404 a mechanical vibration is produced within the enclosure.
    The method further comprises a step 406 of generating resonation in the walls > 20 of the enclosure with the produced low frequency to cover a sound coming > from outside of the enclosure to a microphone of the mobile device. 2 The method then comprises a step 408 of switching off the mechanical 7 vibration when the closing mechanism of the enclosure is opened and a step E 410 of switching on the mechanical vibration when the closing mechanism S 25 of the enclosure is closed.
    Further, the method comprises a step 412 of 3 detecting that the enclosure is closed through the closing mechanism.
    The S method then comprises a step 414 of detecting light within the enclosure.
    Furthermore, the method comprises at least one of the steps: a step 416 of switching on an external light source in connection with an outside surface of the enclosure to indicate an incoming call and/or message in the mobile device and a step 418 of switching on the external sound source in connection with an outside surface of the enclosure to indicate an incoming call and/or message in the mobile device arranged within the enclosure. oON
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    权利要求:
    Claims (13)
    [1] 1. An apparatus for creating an acoustic noise barrier to prevent eavesdropping via a mobile device (120), the apparatus comprising - an enclosure (102, 200) comprising a closing mechanism (204a, 204b); - a low frequency signal generator (104) within the enclosure; - an amplifier (106) within the enclosure, communicatively coupled to the low frequency signal generator; - an electromechanical resonance element (108) communicatively coupled to the amplifier and configured to - produce a mechanical vibration inside the enclosure, - transmit the mechanical vibration into a wall material (126) of the enclosure, and - make the wall material of the enclosure to resonate; - an internal light sensor (110) for detecting light within the enclosure; - a mute switch circuit (112) communicatively coupled to the closing mechanism of the enclosure; and - at least one of - an external light source (114) in communication with an outer surface of the enclosure, communicatively coupled with the internal light sensor; O -an external sound source (116) in communication with an outer N surface of the enclosure and communicatively coupled with the 2 internal light sensor.
    [2] O = 2. An apparatus according to claim 1, wherein the low frequency signal o 25 generator (104) is a random noise signal generator. 3 3. An apparatus according to claim 1 or 2, wherein the mute switch circuit N (112) is configured to
    [3] - switch off the mechanical vibration when the closing mechanism (204a, 204b) of the enclosure (102, 200) is opened; and - switch on the mechanical vibration when the closing mechanism of the enclosure is closed.
    [4] 4. An apparatus according to claim 3, wherein the mute switch circuit (112) is configured to - switch off the amplifier (106) when the closing mechanism (204a, 204b) of the enclosure (102, 200) is opened; and - switch on the amplifier when the closing mechanism of the enclosure is closed.
    [5] 5. An apparatus according to claim 3, wherein the mute switch circuit (112) is configured to - switch off the low frequency signal generator (104) when the closing mechanism (204a, 204b) of the enclosure (102, 200) is opened; and - switch on the low frequency signal generator when the closing mechanism of the enclosure is closed.
    [6] 6. An apparatus according to any of the preceding claims, wherein when the internal light sensor (110) is communicatively coupled to the closing mechanism (204a, 204b) and the apparatus is configured to > 20 - detect that the closing mechanism of the enclosure (102, 200) is closed; N - detect light within the enclosure; and 2 - switch on the external light source (114) and/or switch on the external 7 sound source (116) to indicate an incoming call and/or message in the E mobile device (120) arranged within the enclosure. 00 3 25 J.
    [7] An apparatus according to any of the preceding claims, further comprising > a back-up battery (122), a battery charger (124) and a battery charger control circuit (128).
    [8] 8. An apparatus according to any of the preceding claims, wherein the external light source (114) is selected from a lamp, a light emitting diode, a metal-halide lamp, an incandescent bulb and a compact fluorescent lamp.
    [9] 9. An apparatus according to any of the preceding claims, wherein the external sound source (116) is selected from a buzzer, a speaker and a bell.
    [10] 10. A method for creating an acoustic noise barrier to prevent eavesdropping via a mobile device (120), wherein the mobile device is arranged in an enclosure (102, 200), enclosure is being closable by a closing mechanism (204a, 204b), the method comprising steps of - producing a mechanical vibration within the enclosure; and - generating resonation in the walls (126) of the enclosure with the produced mechanical vibration to cover a sound coming from outside of the enclosure to a microphone of the mobile device.
    [11] 11. A method according to claim 10, wherein the frequency of the produced mechanical vibration is varied randomly.
    [12] 12. A method according to claim 10 or 11, wherein the enclosure (102, 200) further comprises a mute switch circuit (112) communicatively coupled to the closing mechanism (204a, 204b) of the enclosure, and the method > comprises the mute switch circuit switching off the mechanical vibration I 20 when the closing mechanism of the enclosure is opened and switching on N the mechanical vibration when the closing mechanism of the enclosure is © closed. = =
    [13] 13. A method according to any of the claims 10-12, wherein the enclosure (102, 200) further comprises an internal light sensor (110) communicatively > 25 coupledto the closing mechanism (204a, 204b), and the method comprises N - detecting that the closing mechanism of the enclosure is closed;
    - detecting light within the enclosure; and - switching on an external light source (114) and/or switching on the external sound source (116) in connection with an outside surface of the enclosure, to indicate an incoming call and/or message in the mobile device arranged within the enclosure. o
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    申请号 | 申请日 | 专利标题
    FI20195078A|FI128649B|2019-02-06|2019-02-06|Apparatus for creating acoustic noise barrier to prevent eavesdropping via mobile device|FI20195078A| FI128649B|2019-02-06|2019-02-06|Apparatus for creating acoustic noise barrier to prevent eavesdropping via mobile device|
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