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    • 专利摘要:
    The mobile radio telephone, the said apparatus being characterized in that it comprises a body (1) divided at least in a first portion (2) and a second portion (3), the first and second portions being mutually and physically separated from each other other; wherein in said first portion (2) there is: - at least one battery (4) for supplying a radiofrequency stage (5) configured for transmitting and / or receiving a radiofrequency signal of cellular mobile radio telephony and operatively connected with a microphone (6) and / or a speaker (7) installed on said body (1), and - a first optical transceiver stage (8), capable of transmitting an at least vocal signal s (t) encoded by means of an optical radiation (108 ) modulated through said at least vocal signal s (t); and wherein in said second portion (3) there is at least a second optical transceiver stage (9), operatively connected with said microphone (6) and / or said loudspeaker (7), able to transmit said at least one vocal electric signal s (t) encoded by means of an optical radiation (108) modulated through said at least vocal signal s (t) towards said first optical transceiver stage (8), said second portion (3) being in use the portion susceptible to be gripped or however retained during the telephone conversation and in which the second portion (3) lacks radiofrequency transceiver devices and in which at least said loudspeaker (7) is installed at the second portion (3) of said body (1).
    公开号:CH714132A2
    申请号:CH01124/17
    申请日:2017-09-08
    公开日:2019-03-15
    发明作者:Pasquali Alessandro
    申请人:Slux Sagl；
    IPC主号:
    专利说明:

    Description
    FIELD OF THE FOUND
    [0001] The present invention relates to the field of electronic devices for transceiver and in detail concerns a mobile radio telephone apparatus.
    STATE OF ART
    [0002] To date mobile radio telephones include a body typically equipped with a battery, a screen, a data processing unit electrically powered by said battery, and at least one radiofrequency stage, also electrically powered by said battery and integrating means for receiving and transmitting radio signals that include appropriately coded voice signals, text messages, images and more generally any type of multimedia content that can be transmitted through a today's smartphone.
    [0003] The radiofrequency stage is electrically connected to an antenna - typically of the patch type - which receives the radiofrequency signals from the various repeaters in the area and transmits signals to the aforementioned repeaters. To date, mobile telephone radio communication uses frequency bands between 900 MHz and 2.1 GHz, and the power radiated and transmitted by the antenna is a function of the distance between it and the repeater.
    [0004] Following the widespread use of radiofrequency systems for mobile radio communication, doubts and numerous researches have arisen about the risk that the population runs in maintaining mobile radiocommunication devices near the head for a long time. A measure of the radiofrequency exposure level for cellular mobile radio telephony devices is the SAR, typically used to measure the exposure of a radiofrequency biological tissue with a carrier frequency between 100 kHz and 100 GHz.
    [0005] The various governments have defined the safety limits of exposure (head or a portion thereof) to the RF energy produced by mobile devices. For example, to date in the United States of America, the Federal Communications Commission (FCC) requires that mobile phones sold have a SAR level of 1.6 watts per kilogram (W / kg) relative to a volume containing a mass of 1 gram of tissue, while in the European Union CENELEC sets the limits for SAR following IEC standards. Despite the limitations introduced by the regulations, today there is still doubt that exposure to radiofrequency sources for a long time leads to a concrete neoplastic risk, especially in the brain.
    [0006] The applicant has found that the current demand of the population in terms of telephone radio communication is such that it can no longer do without cellular telephone communication. Not only has the need for cellular radio communication become widespread in developing countries, but, moreover, in the industrialized countries, the old concomitant domestic telephony is gradually disappearing with a progressive reduction in the number of workstations - the old telephone booths - in which a user could connect in telephony with another user through a landline outside the home.
    [0007] The object of the present invention is to describe a mobile radio telephone which allows to solve the drawbacks described above.
    SUMMARY OF THE INVENTION
    [0008] The Applicant, in order to allow the user to overcome the drawback also of the localized heating caused by the radiofrequency communication in the vicinity of the ear, has realized a mobile radio telephone apparatus, the said apparatus being characterized in that it comprises a body ( 1) divided at least into a first portion (2) and a second portion (3), said first and second portions being mutually and physically separated from each other; wherein in said first portion (2) there is: - at least one battery (4) for supplying a radiofrequency stage (5) configured for transmitting and / or receiving a radiofrequency signal of cellular mobile radio telephony and operatively connected with a microphone (6) and / or a speaker (7) installed on said body (1), and - a first optical transceiver stage (8), capable of transmitting an at least vocal signal s (t) encoded by means of an optical radiation (108 ) modulated through said at least vocal signal s (t); and wherein in said second portion (3) there is at least a second optical transceiver stage (9), operatively connected with said microphone (6) and / or said loudspeaker (7), able to transmit said at least one vocal electric signal s (t) encoded by means of an optical radiation (108) modulated through said at least vocal signal s (t) towards said first optical transceiver stage (8), said second portion (3) being in use the portion susceptible to be gripped or however retained during the telephone conversation.
    [0009] According to a further non-limiting aspect, or second aspect, depending on the said first aspect, the said high-speaker (7) is installed at the second portion (3) of the said body (1).
    [0010] According to a further non-limiting aspect, or third aspect, the second portion (3) is devoid of radiofrequency ricetra-device devices.
    [0011] Advantageously, the Applicant has observed that during the telephone conversation, the second portion which has the loudspeaker is the one most likely to be held near the body; therefore having this portion only an optical transceiver stage, it avoids having near the ear a radiofrequency device that could damage or in any case place the user in a potential situation of increased cancer risk.
    [0012] According to a further non-limiting or fourth aspect, depending on any of the previous aspects, the said second portion (3) of the body (1) also comprises the said microphone (6).
    [0013] According to a further non-limiting or fifth aspect, depending on any of the previous aspects, the said loudspeaker (7) and the said microphone (8) are electrically connected to the said second optical transceiver stage (9).
    [0014] According to a further non-limiting or sixth aspect, depending on any of the previous aspects, the said first and the said second optical transceiver stage (8, 9) each comprise at least one modulator stage (101) comprising: - an input (105) adapted to receive in use an electrical signal (s (t)) to be modular, and - an output (107) transmitting to at least one photoemitter (100) a driving signal (v7 (t), I7 ( t)) in voltage or current for which the said electrical signal (s (t)) represents a modulating signal, where the said at least one photoemitter (100) transmits an optical radiation (108) with radiation intensity lr (t) variable according to said driving signal (v7 (t), Ì7 (t)).
    [0015] According to a further non-limiting aspect, or seventh aspect, depending on the said sixth aspect or on one of the previous aspects when it depends on it, the said modulator stage (101) is a frequency modulation modulator stage.
    [0016] Alternatively, according to a further non-limiting aspect, or eighth aspect, depending on said sixth aspect or on one of the previous aspects depending therefrom, the said modulator stage (101) is an amplitude modulation modulator stage.
    [0017] Still alternatively, according to a further non-limiting aspect, or ninth aspect, depending on said sixth aspect or on one of the previous aspects, said modulator stage (101) comprises a cascade of a first modulator AM (102) and a second FM modulator (103), said FM modulator (103) being located downstream of said AM modulator (102) and having its own output directly connected with the output (107) of said modulator stage (101), wherein said modulator AM (102) has an input directly connected to said input (105) of said modulator stage and is directly supplied by said electric signal (s (t)) to be modulated and in which said modulator AM (102) has an output on which it generates an intermediate signal (s2 (t)) fed to the input of the said FM modulator (103).
    [0018] Advantageously, the AM / FM hybrid modulation of which in the previous ninth aspect has been observed to be particularly suitable for an indirect radiation transmission of optical radiation.
    [0019] According to a further non-limiting or tenth aspect, depending on the aforesaid ninth aspect, there is also a driving stage (104) for said at least one photoemitter (100) interposed between said output (107) of said modulator stage (101) and the said at least one photo-emitter (100), in which the said driving stage (104) is configured to condition the said driving signal (v7 (t), I7 (t)) and comprises processing means comprising at least an operative configuration such that the said intensity of radiation lr (t) variable according to the said driving signal comprises a first continuous part I, independent of the said driving signal and a second part variable in time, direct function of the said driving signal , in which the said variable part in the direct function of the said driving signal is lower by absolute value than the absolute value assumed by the said first continuous part.
    [0020] According to a further non-limiting aspect, or eleventh aspect, depending on the ninth or tenth aspect, said intermediate signal (s2 (t)) fed into the input of said FM modulator (103) is a signal able to cause a variation of the instantaneous frequency assumed by the said driving signal (v7 (t)), Ì7 (t)) at the output of the said FM modulator (103).
    [0021] According to a further non-limiting aspect, or twelfth aspect, the said device comprises at least one reference frequency generating stage (109), in which the said reference frequency generating stage (109) is electrically connected to a reference frequency input of said AM modulator (102) and generates at least a first reference frequency (fO) for said AM modulator.
    [0022] Alternatively to the aforementioned twelfth aspect, according to a further non-limiting aspect, or thirteenth aspect, the said reference frequency generating stage (109) is electrically connected with a frequency reference input of the said modulator AM (102) by means of a first output thereof (109f) and is also electrically connected to a frequency reference input of said FM modulator (103) by means of a second output thereof (109s).
    [0023] According to a further non-limiting aspect, or fourteenth aspect, the said reference frequency generating stage (109) generates at least a first reference frequency (fO) for the said modulator AM (102) and a second reference frequency (fc) for the said FM modulator (103).
    [0024] According to a further non-limiting or fifteenth aspect, which can be combined with one or more of the preceding aspects, the said modulator stage (101) is configured to be supplied with an analog signal and wherein upstream of the said input (105) of said modulator stage (101) there is a digital / analog converter.
    [0025] According to a further non-limiting aspect, or sixteenth aspect, depending on one or more of the preceding aspects, the said first and the said second optical transceiver stage (8, 9) each comprise at least one demodulator stage (201) comprising : - an input (205) adapted to receive in use a driving signal (v7 (t), i7 (t)) in modulated voltage or current and generated through a photoreceiver (200) connected to it and receiving in use a radiation optics (108) also reflected, and - a transmitting output (207) an output replication signal (s' (t)) for which the said electrical signal (s (t)) represents a modulating signal.
    [0026] According to a further non-limiting aspect, or seventeenth aspect dependent on the previous sixteenth aspect, the said demodulator stage (201) is a demodulation amplitude demodulator stage.
    [0027] Alternatively, according to a further non-limiting aspect, or eighteenth aspect, depending on the said sixteenth aspect, the said demodulator stage (201) is a demodulation frequency demodulator stage.
    [0028] Still alternatively, according to a further non-limiting aspect, or nineteenth aspect, depending on said sixteenth aspect, between said input and said output of said demodulator stage (201) there is a cascade of a first demodulator FM (203) and a second demodulator AM (202), said demodulator FM (203) being located upstream of said demodulator AM (202), in which said demodulator AM (202) has an input directly connected to the output of said demodulator FM (203) .
    [0029] According to a further non-limiting aspect, or twentieth aspect, which can be combined with the said eighteenth or nineteenth aspect, the said demodulator FM (203) has an output on which it generates an intermediate signal (s2 '(t)) fed into the input to the said demodulator AM (202).
    [0030] According to a further non-limiting aspect, or twenty-first aspect, the said at least one photoreceiver (200) feeds a driving stage (204) for the said demodulator stage (201), the said driving stage being interposed between the said input ( 205) of the said demodulator stage (201) and the said at least one photoreceiver (200), wherein the said driving stage (204) in generating the said driving signal (v7 (t), i7 (t)), is configured to identify in the intensity of radiation lr (t) variable received in use by said photoreceiver (200) a first continuous part I and a second part variable in time direct function of said driving signal, and to generate said driving signal ( v7 '(t), i7' (t)) as a time-varying direct signal of said second variable part.
    [0031] According to a further non-limiting aspect, or twenty-second aspect, which can be combined with one or more of the previous aspects, the said first optical transceiver (8) comprises at least a first operating configuration in which it transmits an electrical signal containing said radio-frequency signal to the said radio-frequency stage. at least one component of said vocal electric signal (s (t)) when retrieved from said microphone (7).
    [0032] According to a further non-limiting aspect, or twenty-third aspect, the said modulator stage (101) is a pulse-width modulation modulator stage.
    [0033] According to a further non-limiting aspect, or twenty-fourth aspect dependent on the previous sixteenth aspect, the said demodulator stage (201) is a demodulation demodulation pulse-width stage.
    [0034] According to a further preferred and non-limiting aspect, or twenty-fifth aspect, which can be combined with one or more of the preceding aspects, the said first and second portions (2, 3) of the body (1) can be selectively coupled together in at least one first operative configuration in which, when coupled, the aforementioned first and second portions (2, 3) of the body (1) form a single body.
    [0035] According to a further preferred and non-limiting aspect, or twenty-sixth aspect, which can be combined with one or more of the preceding aspects, the said first optical modulator stage comprises a digital / analogue converter stage (106), placed between the input of the device and the input (105) of the modulator stage (101).
    [0036] According to a further preferred and non-limiting aspect, or twenty-seventh aspect, which can be combined with one or more of the preceding aspects, the said first optical transceiver stage and the said second optical transceiver stage (8, 9) each comprise an encryption stage and decryption (12, 13), configured at least to cause a transmission of optical radiation (108) in which the modulating signal is not a clear signal.
    [0037] Advantageously, the use of an encryption and decryption stage allows to transmit an optical radiation (108) whose payload, represented by said at least one vocal electric signal s (t) is encrypted. A potential attacker who also knew the modulation scheme used to modulate optical radiation would not be able to intercept its contents.
    [0038] According to a further non-limiting aspect, or the 28th aspect of the invention, which can be combined with the previous aspects of the invention, the said first optical transceiver stage and the said second optical transceiver stage (8, 9) each comprise at least one photoemitter ( 100) transmission of directive radiation.
    [0039] According to a further non-limiting aspect, or twenty-ninth aspect of the invention, which can be combined with one or more of the previous aspects of the invention, the said first optical transceiver stage and the said second optical transceiver stage (8, 9) realize a communication bidirectional with electric optical electric conversion.
    [0040] According to a further non-limiting aspect or thirtieth aspect of the invention, which can be combined with one or more of the previous aspects of the invention, the said first optical transceiver stage and the said second optical transceiver stage (8, 9) realize a data transceiver full-duplex.
    [0041] For greater clarity, the following definitions apply in the present description.
    [0042] For the purposes of the present invention, by optical radiation is meant an optical radiation comprised in the infrared spectrum and / or in the ultraviolet spectrum and / or in the visible spectrum.
    [0043] According to the present invention, direct optical radiation or direct optical transmission means a transmission of optical radiation in which optically opaque obstacles and reflections are not interposed between a source or photoemitter and a destination or photoreceiver. In other words, in the direct optical radiation or direct optical transmission, the transmission of the signals takes place with the said source or photoemitter and the destination or photoreceiver in an optical range, ie mutually visible.
    [0044] For the purpose of greater understanding of the present invention, the following definitions are applied: - "Transparency" means a characteristic such that the material under examination can pass radiation incident along a preferential direction, independently of the attenuation that this radiation undergoes in passing through the said material. - "Infrared" or "Infrared" means electromagnetic radiation which has a wavelength of approximately between 0.7 pm and 15 pm. - "visible" or "visible spectrum" means an electromagnetic radiation which has a wavelength indicatively comprised between 390 and 700 nm. - "Ultraviolet" or "ultraviolet" means an electromagnetic radiation which has a wavelength approximately between 400 nm and 10 nm. - By "directive irradiation" or even only "directive" when referring to an optical and / or radiofrequency radiation, we mean a radiation emitted by a radiator in the domain of interest - therefore optical or radiofrequency - in which a sector of the sphere of an otherwise isotropic radiator has a greater radiated electromagnetic power density than the remaining sectors.
    BRIEF DESCRIPTION OF THE DRAWINGS
    [0045] Some embodiments and some aspects of the invention will be described hereinafter with reference to the accompanying drawings, provided for indicative purposes only and therefore not limiting, in which:
    Fig. 1 shows a schematic representation of a mobile radio telephone in accordance with the present invention;
    Fig. 2 shows a block diagram of a first optical transceiver stage object of the invention;
    Fig. 3 shows a block diagram of a second optical transceiver stage object of the invention; is
    Fig. 4 illustrates a principle scheme of the optical modulation / demodulation of a transmission according to the object of the invention.
    DETAILED DESCRIPTION OF THE INVENTION
    [0046] With reference to the annexed figures, a first object of the invention relates to a cellular telephone set or mobile radio telephone set, which uses an optical communication to transmit voice and / or video and / or data between two of its portions in such a way that the communication radiofrequency which takes place in reception and transmission from and to the various repeaters takes place via a radiofrequency communication stage which is connected as far as possible with respect to the portion of the device that is closest to the user's brain.
    [0047] As shown in detail in fig. 1, the apparatus according to the invention comprises a first portion 2 and a second portion 3 which are physically separable from each other and which define in the assembly at least a first operative configuration of mutual divisible grouping in which they are joined to form a single body and at least one second division operating configuration such that the first portion 2 and the second portion 3 are separated and communicate electronic data between them by means of optical radiation reciprocally transmitted by means of respective optical transceiver stages.
    [0048] In detail, in the first portion 2 of the body 1 which is that which in use is maintained at the maximum distance from the user's brain there is at least one battery 4, preferably but not limited to a rechargeable type for powering a stage radiofrequency 5 configured to receive and / or transmit a radiofrequency signal of cellular mobile telephony according to any of the GSM, GRPS, UMTS, UPSA, HSDPA, LTE, or future generations standards including multimedia electronic and / or voice data as appropriate . The radiofrequency stage 5 is operatively connected with a microphone 6 and a loudspeaker 7 which are installed on the body 1 of the apparatus of the invention, and which preferably although not limitedly are both installed on the second portion 3 of the body 1 which is the one in question. use kept closer to the operator's brain. For the purposes of the present invention, for operationally connected purposes it is to be understood a non-direct electronic connection, preferably not via wire, in which the 10 radiofrequency stage transmits data coming also from said microphone 6 and / or towards said loudspeaker 7, also electronically processed.
    [0049] The first portion 2 of the body 1 integrates an antenna 5a preferably but not limitedly of the patch type, apt to cause the diffusion in the atmosphere of the radio-frequency electromagnetic signal, preferably though not limitedly in the range of frequencies 900 MHz-2 , 1 GHz typical of mobile cellular radio communications. The antenna 5a is electrically connected to the radiofrequency stage 5.
    [0050] The first portion 2 of the body 1 further integrates a data processing unit 11 which is electrically powered by the battery 4, which in turn also supplies the radiofrequency stage 5 and a first stage of optical radio communication 8, also it is installed within the first portion 2 of the body 1. The optical radiocommunication stage 8 presents in detail at least a first photoemitter 100 adapted to transmit an optical radiation 108 towards a corresponding second optical radio-communication stage 9 installed in the second portion 3 of the body 1. More particularly, the first optical transceiver stage 8 is adapted in use to transmit at least one vocal electric signal s (t) which is suitably coded with an optical radiation 108 which is precisely modulated according to the aforementioned vocal electric signal s ( t).
    [0051] The second portion 3 of the body 1, which is a portion lacking in radiofrequency devices, and which in use is the portion which is susceptible of being held by the user, also comprises a second stage with optical radio communication 9 operatively coupled to said first stage with optical radio communication 8, and having integrated a microphone 6 and a loudspeaker 7 which are electrically connected to the optical radio communication stage 8, in turn configured in such a way as to at least transmit the said at least one voice electric signal s (t) encoded by optical radiation which this time comes from the microphone 6. The second portion 3 of the body 1 is advantageously also supplied through a battery which can be a rechargeable battery. Preferably, although not limitedly, the battery of the second portion 3 is recharged indirectly through contacts present on the portion itself, which in the first operating configuration couple with further contacts of the first portion 2 of the body 1 so as to create a stable electrical connection - at least as long as the aforementioned first operational configuration remains.
    [0052] Each of the optical radio-communication stages 8, 9 further comprises an electrically-connected photoreceiver 200. This makes it possible to realize a bidirectional optical communication of also fuli-duplex type between the first and the second portion of the body 1.
    [0053] The Applicant has considered that in order to lead to the establishment of an efficient optical communication between the first and second portions 2, 3 of the body 1,11, the first stage with optical radio communication 8 and the second stage with optical radio communication 9 transmit according to one predefined modulation scheme which may comprise for example and not limitedly, an AM modulation, an FM modulation, a PWM modulation or a hybrid modulation. According to the selected modulation scheme, therefore, the first and second stage with optical radio communication 8, 9 will comprise modulating and demodulating and modulating and demodulating stages respectively a modulated signal in AM, FM, PWM or hybrid.
    [0054] According to a first embodiment, the first and second stage of optical radio communication 8, 9 comprise a modulator and an AM demodulator; the modulator AM is fed into the input with the aforesaid at least one vocal electric signal s (t) and generates in output an electrical driving signal in voltage or current for the photoemitter 100; the demodulator AM is fed into the input with a voltage or current driving signal received from the photoreceiver 200 and generates at its output a signal in base band s' (t) corresponding to a replica of the aforementioned vocal electric signal s (t).
    [0055] According to a second embodiment, the first and second stage of optical radio communication 8, 9 therefore comprise a modulator and an FM demodulator; the FM modulator is fed at the input with the aforesaid at least one vocal electric signal s (t) and generates in output an electrical driving signal in voltage or in current for the photoemitter 100; the FM demodulator is fed at the input with a voltage or current driving signal received from the photoreceiver 200 and generates at its output a signal in base band s' (t) corresponding to a replica of the aforementioned vocal electric signal s (t).
    [0056] According to a third embodiment, the first and second stage of optical radio communication 8, 9 therefore comprise a modulator and a PWM demodulator; the PWM modulator is fed at the input with the aforesaid at least one vocal electric signal s (t) and generates in output an electrical driving signal in voltage or current for the photoemitter 100; the PWM demodulator is fed at the input with a voltage or current driving signal received from the photoreceiver 200 and generates at its output a signal in base band s' (t) corresponding to a replica of the aforementioned vocal electric signal s (t).
    [0057] According to a fourth embodiment, said first and said first and second stage of optical radio communication 8, 9 each comprise a modulator and an AM / FM hybrid demodulator.
    [0058] Fig. 2 shows a detailed diagram of the second portion 3 of the body 1; fig. 3 shows a detailed diagram of the first portion 2 of the body 1, both equipped with an AM / FM hybrid modulator and demodulator which will be better described in the following description portion.
    [0059] In greater detail, and with reference to figs. 2 and 3, the analog audio signal s (t) before being transmitted to the photo-emitter 100 which preferably includes but not limited to a LED diode, is subjected during transmission to a modulation step performed by an analogue and modulator stage 101. hybrid. In a transmission module 99, which comprises the photo-emitter 100, the modulator stage 101 comprises a plurality of series modulators able to perform the said hybrid modulation, and in detail, starting from its input 105 on which it receives the audio signal analog s (t), first comprises a modulator AM 102 directly supplied by the aforesaid input 105, and a modulator FM 103 placed in series with the modulator AM 102 and directly supplied by it. The output 107 of the modulator stage 101 supplies an input of a driver stage 104 for the said photoemitter 100.
    [0060] In particular the output 107 of the modulator stage 101 produces a voltage signal v7 (t) or in current Ì7 (t) which is fed through the driver 104 to the photoemitter 100. In particular if the photoemitter 100 is realized by one or more LEDs 100, it has been found that the brightness of the diode is proportional to the voltage or current supplied to it at the input. More in detail, the LED diode or in general the photo-emitters 100 must be photo-emitters whose light intensity curve of the voltage or current supplied to them at the input must not be constant. More preferably, but not limited to, the light intensity curve of the voltage or current is substantially linear.
    [0061] The voltage signal v7 (t) or the current signal I7 (t) produced at the output 107 by the modulator stage 101 are analog signals correlated to the audio input signal s (t) and, when supplied to the photoemitter 100, they produce a variation in the brightness lr (t) of the optical beam 108 transmitted by the photoemitter proportional to the voltage or current variation of the voltage signal v7 (t) or of the current signal I1 (t) respectively.
    [0062] More particularly, given s (t) the input signal to the modulator AM 102, this modulator AM 102 produces at its output an intermediate signal s2 (t) which takes the following form: s2 (t) = s (t) sin (2ìr / ot) [0063] Where f or is the carrier frequency of the AM modulation.
    The FM 103 modulator realizes a frequency modulation, such that its instantaneous frequency takes the form: / i (0 = fc + krs2 (t) [0064] In which fc is the carrier frequency of the FM modulation.
    The output signal v7 (t) or Ì7 (t) will therefore take the form
    Acos [^ 27t / c + 2nkfS2 (.t ') ^ t] [0065] The two carrier frequencies fO and fc respectively of the AM or FM modulation are predetermined real values, which however can be modified by the user according to a known technique and therefore not described here. Conveniently, a frequency generator 109 is also present in the device object of the invention, provided with a first output 109f supplying the modulator AM and a second output 109s supplying the modulator FM respectively with a sinusoidal frequency-frequency signal fo and with a cosine-frequency frequency signal fc. This solution is not to be understood in a limiting way, since it is possible to realize the device object of the invention in such a way that the frequency generator 109 has a single output directed towards both the modulator AM 102 and the modulator FM 103, leaving then to this lastly, the task of generating the frequency the cosinusoidal signal at frequency fc on the basis of the sinusoidal signal at frequency f o generated by the frequency generator 109. The applicant has found that the carrier frequency fc can also be zero. In this case the hybrid modulation takes the form of a direct modulation. In order that there are no significant distortions of the optical beam 108 in terms of brightness variation lr (t), the applicant observed that the band occupied by the brightness change signal lr (t) is even more the voltage signal v7 (t) or current I7 (t) supplied to the photoemitter 100 must not exceed its maximum pass band.
    [0066] The applicant has observed that the input data signal can also be a digital signal. In this case, a second embodiment was conceived which differs from the first embodiment in that it comprises a digital / analog converter stage 106, placed between the input of the device and the input 105 of the modulator stage 101, which transforms the input data signal into an appropriately shaped analogue signal to be modulated analogically through the AM 102 and FM 103 modulators as previously described. Since the digital / analog converter 106 belongs to the second embodiment and therefore with respect to the first embodiment, it is optional, representing an additional module with respect to the basic system of the first embodiment, in fig. 2 this digital / analog converter 106 is represented with dashed lines precisely to highlight the optionality of the first embodiment and the association with the second.
    [0067] In the optical transceiver stage 8 or 9, at the receiver 199 at least one photoreceiver 200 receives the reflected optical beam 108 and transmits a voltage or current signal v7 '(t) or i7' (t) according to the function intensity. of the time of said optical beam 108 towards a demodulator stage 201 which performs a hybrid demodulation step of the received voltage or current signal. The demodulator 201 comprises a cascade of a demodulator FM 203 and a demodulator AM 202, in which the input of the demodulator AM 202 is directly supplied by the output of the demodulator FM 203. The demodulator FM 203 has an input 205 on which it is powered the said voltage or current signal v7 '(t) or i7' (t). As in the case of the transmission side, between the FM demodulator and the photoreceiver 200 there may be a driver capable of generating the voltage or current signal v7 '(t) or Ì7' (t), said for the purposes of the present invention "signal of piloting, so as to separate the first continuous component I from the second variable component of the optical radiation.
    [0068] As in the case of the modulation side, the receiver device 199 also comprises a frequency generator 109, provided with a first output 109f supplying the modulator AM and a second output 109s supplying the modulator FM respectively with a sinusoidal signal at frequency fo and with a cosinusoidal signal at frequency fc. This solution is not to be understood in a limiting manner, since it is possible to realize the device object of the invention in such a way that the frequency generator 109 possesses a single output directed towards both the demodulator AM 202 and the demodulator FM 203, leaving then to this lastly, the task of generating the frequency the cosinusoidal signal at frequency fc on the basis of the sinusoidal signal at frequency f o generated by the frequency generator 109. The applicant has found that the carrier frequency fc can also be zero. In this case the hybrid demodulation takes the form of a direct demodulation.
    [0069] The demodulator stage 201, like the modulator stage 101, can be realized hardware or with a mixed hardware software structure or again as SDR, therefore purely software without this difference constituting a limitation for the purposes of the present invention. The receiver device 199 therefore produces on its output 199u a replica s' (t) of the input signal s (t) on the transmitter side.
    [0070] In particular, the voltage or current signal v7 '(t) or i7' (t) generated by the photoreceiver is first transmitted to the demodulator FM 203 which extracts a copy s2 '(t) of the intermediate signal s2 (t) which is fed to the input of the demodulator AM 202 which performs the actual conversion towards the replica signal s' (t) of the input signal s (t) to the transmitter side.
    [0071] Advantageously, the Applicant has observed that the hybrid modulation and demodulation performed as described above are particularly suitable for being used to transmit an analog audio data signal even with transmission by reflections, since it has been proved that the replica s' (t) of the analog audio input signal s (t) on the transmitter side is received without audible distortions or otherwise capable of significantly worsening the quality of the signal.
    [0072] The method which is therefore carried out by the first and second stage of optical radio communication 8, 9 during the transmission of the audio signal comprises first of all a step for feeding an analog signal s (t) to a modulator stage 101, which performs a modulation step first comprising an amplitude modulation step of said analog signal s (t) to produce at its output from its modulator AM 102 an intermediate signal s2 (t) amplitude modulated and further comprising an intermediate signal supply step s2 (t) to a modulator FM 103 for obtaining at output a voltage or current signal v7 (t), Ì7 (t) fed to the input of a photoemitter 100, in which the step of feeding the voltage or current signal v7 (t), 7 (t) to said photoemitter 100 generates a variation in luminous intensity lr (t) proportional to the voltage or current signal v7 (t), 7 (t). Similarly, on the receiver side, the said method comprises a receiving step of an optical beam 108 carrying an electronic data modulated therein according to a predetermined modulation, in which at least one photoreceiver 200 generates a voltage or current signal v7 'in the reception step. t), i7 '(t) of amplitude proportional to the luminous intensity Ir (t) received, and in which there is a demodulation step performed by at least one demodulator stage 201 of a receiver 199 in which the at least one demodulator stage 201 first of all it performs a frequency demodulation of said voltage or current signal v7 '(t), i7' (t) generated by the at least one photoreceiver to produce an intermediate signal s2 '(t) and in which said method comprises a step of supply of said intermediate signal s2 '(t) to the input of an amplitude demodulator 102 of said receiver 199, which performs an amplitude demodulation to extract from said intermediate signal s2' (t) a data signal s (t) analog.
    [0073] In the aforementioned method, both in the transmission phase and in the reception phase, the frequency and amplitude modulations are sequential respectively, and in particular: in the transmission phase, the frequency modulation follows the amplitude modulation while in phase of reception the amplitude demodulation follows the frequency demodulation. In the transmission phase, the intermediate signal s2 (t) contributes to defining an instantaneous frequency of a signal which will be subject to a frequency modulation by means of the aforesaid intermediate signal s2 (t).
    [0074] The Applicant has observed that in the optical domain the hybrid modulation formed by a cascade of an FM modulation of a signal already modulated in AM makes the receivers particularly sensitive to detect the presence of a very weak power signal.
    权利要求:
    Claims (18)
    [1]
    claims
    1. Mobile radio telephone, said apparatus being characterized in that it comprises a body (1) divided at least in a first portion (2) and a second portion (3), said first and second portions being mutually and physically separated one on the other; wherein in said first portion (2) there is: - at least one battery (4) for supplying a radiofrequency stage (5) configured for transmitting and / or receiving a radiofrequency signal of cellular mobile radio telephony and operatively connected with a microphone (6) and / or a speaker (7) installed on said body (1), and - a first optical transceiver stage (8), capable of transmitting an at least vocal signal s (t) encoded by means of an optical radiation (108 ) modulated through said at least vocal signal s (t); and wherein in said second portion (3) there is at least a second optical transceiver stage (9), operatively connected with said microphone (6) and / or said loudspeaker (7), able to transmit said at least one vocal electric signal s (t) encoded by means of an optical radiation (108) modulated through said at least vocal signal s (t) towards said first optical transceiver stage (8), said second portion (3) being in use the portion susceptible to be gripped or however retained during the telephone conversation and in which the second portion (3) lacks radiofrequency transceiver devices and in which at least said loudspeaker (7) is installed at the second portion (3) of said body (1).
    [2]
    2. Apparatus according to claim 1, wherein said second portion (3) of the body (1) also comprises said microphone (6) and in which said loudspeaker (7) and said microphone (8) are electrically connected with the said second optical transceiver stage (9).
    [3]
    3. Apparatus according to claim 1 or claim 2 wherein said first and said second optical transceiver stage (8, 9) each comprise at least one modulator stage (101) comprising: - an input (105) adapted to receive in use an electrical signal (s (t)) to be modular, and - an output (107) transmitting to at least one photoemitter (100) a driving signal (v7 (t), i7 (t)) in voltage or current for which the said electric signal (s (t)) represents a modulating signal, where the said at least one photoemitter (100) transmits an optical radiation (108) with radiation intensity lr (t) variable according to the said driving signal ( v7 (t), i7 (t)).
    [4]
    4. Apparatus according to claim 3, wherein said modulator stage (101) is a frequency modulation modulator stage.
    [5]
    5. Apparatus according to claim 3, wherein said modulator stage (101) is an amplitude modulation modulator stage.
    [6]
    6. Apparatus according to claim 3, wherein said modulator stage (101) comprises a cascade of a first modulator AM (102) and of a second modulator FM (103), said FM modulator (103) being located downstream of said modulator AM (102) and having its own output directly connected to the output (107) of said modulator stage (101), in which said modulator AM (102) has an input directly connected to said input (105) of said stage modulator and is directly supplied by the said electrical signal (s (t)) to be modulated and in which the said modulator AM (102) has an output on which it generates an intermediate signal (s2 (t)) fed to the input of the said modulator FM (103).
    [7]
    7. Apparatus according to claim 6, wherein said intermediate signal (s2 (t)) fed to the input of said FM modulator (103) is a signal able to cause a variation of the instantaneous frequency which the said driving signal takes (v7 ( t)), i7 (t)) at the output of the said FM modulator (103).
    [8]
    8. Apparatus according to Claim 6 or Claim 7, in which the said reference frequency generating stage (109) is electrically connected to a frequency reference input of the said AM modulator (102) and generates at least a first frequency of reference (fO) for the said AM modulator.
    [9]
    9. Apparatus according to claim 6 or claim 7, wherein said reference frequency generating stage (109) generates at least a first reference frequency (fO) for said AM modulator (102) and a second reference frequency (fc) for the said FM modulator (103).
    [10]
    10. Apparatus according to any one of the preceding claims, wherein said first and said second optical transceiver stage (8, 9) each comprise at least one demodulator stage (201) comprising: - an input (205) adapted to receive in I use a driving signal (v7 (t), i7 (t)) in modulated voltage or current and generated through a photoreceiver (200) connected to it and receiving in use an optical radiation (108) also reflected, and - an output (207) transmitting an output replication signal (s' (t)) for which the said electrical signal (s (t)) represents a modulating signal.
    [11]
    11. Apparatus according to claim 10 when dependent on claim 5, wherein said demodulator stage (201) is an amplitude demodulation demodulator stage.
    [12]
    12. Apparatus according to claim 10, when dependent on claim 4, wherein said demodulator stage (201) is a demodulation frequency demodulator stage.
    [13]
    13. Apparatus according to claim 10 when dependent on claim 6 and / or claim 7 and / or claim 8, wherein a cascade of a first demodulator FM is present between said input and said output of said demodulator stage (201). 203) and of a second demodulator AM (202), said demodulator FM (203) being located upstream of said demodulator AM (202), wherein said demodulator AM (202) has an input directly connected to the output of said demodulator FM (203).
    [14]
    14. Apparatus according to Claim 13, in which the said demodulator FM (203) has an output on which it generates an intermediate signal (s2 '(t)) fed to the input of the said demodulator AM (202).
    [15]
    15. Apparatus according to claim 3, wherein said modulator stage (101) is a pulse-width modulation modulator stage.
    [16]
    16. Apparatus according to claim 15 and claim 10, wherein said demodulator stage (201) is a demodulation demodulation pulse-width stage.
    [17]
    17. Apparatus according to one or more of claims 1-16, wherein said first and second portions (2, 3) of the body (1) can be selectively coupled together in at least one first operating configuration in which when coupled, the aforementioned first and the second portion (2, 3) of the body (1) form a single body.
    [18]
    18. Apparatus according to one or more of the preceding claims, wherein said first optical transceiver stage and said second optical transceiver stage (8, 9) each comprise an encryption and decryption stage (12, 13), configured at least to cause a transmission of an optical radiation (108) in which the modulating signal is not a clear signal.
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    同族专利:
    公开号 | 公开日
    CH714132B1|2021-11-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CH01124/17A|CH714132B1|2017-09-08|2017-09-08|Mobile radio telephone set.|CH01124/17A| CH714132B1|2017-09-08|2017-09-08|Mobile radio telephone set.|
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