JP2005341130A - Method and apparatus for transmitting/receiving multiplex sound - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize multi-channel communication without adding an electronic circuit and without the increase in electric power and enlargement of a cabinet. <P>SOLUTION: Visible light or infrared rays modulated in strength by an input signal are respectively output by light emitting means 72 and 73 to two sound signal inputs 70 and 71. The output from the light emitting means 72 is output via a vertical polarizing means 74, and the output from the light emitting means 73 is output via a horizontal polarizing means 75. They are output to the same position. Thus, the visible light or the infrared output modulated vertically by the sound signal 70 and horizontally by the sound signal 71 can be obtained. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a multiplexed voice transmission / reception method and apparatus for multi-channel voice data transmission.

  In the conventional technology, a method is described in which an analog signal is quantized by a noise shaping circuit or the like, transmitted as 1-bit data quantized instead of conventional PCM, and reproduced on the reception side (see, for example, Patent Document 1). .

  FIG. 15 shows an example of the above prior art. 1-bit quantization means 12 for converting an analog signal 11 such as voice or music into a 1-bit digital signal by a noise shaping method, and light, infrared rays, ultraviolet rays, radio waves, and magnetism modulated in some way by the 1-bit digital signal in the air Infrared (1 bit) transmitting means 13 for emitting light, infrared (1 bit) receiving means 14 for receiving and demodulating light, infrared light, ultraviolet light, radio waves and magnetism emitted in the air and obtaining the original 1 bit digital signal, and this 1 bit The speaker driving means 15 for driving the speaker 16 with the digital signal is provided with the speaker 16.

  The output of the 1-bit quantizing means 12, that is, the noise shaping A / D converter, converts an analog signal such as a sound into a pulsed dense wave so that the sound travels in the air as an air dense wave. This pulse train is a normal serial data train, but is not serially expanded as a group of data of several bits as in the conventional circuit, but each piece of data is independent data.

  For this reason, it is unnecessary to add synchronization data indicating the head position of a group of data as in the prior art. Furthermore, since the noise shaping output is originally 1 bit, parallel serial conversion means is also unnecessary.

  Therefore, it is not necessary to perform synchronization extraction by the synchronization pattern on the receiving side, and therefore, there is no need for data calculation processing, and there is no need for clock recovery for taking in data. Furthermore, since the received data string has a waveform as a pulse sparse / dense wave, if the speaker is driven by speaker driving means such as a low impedance driver with this waveform, it can be reproduced as it is.

  In this way, 1-bit A / D conversion by noise shaping is performed, and light, infrared rays, ultraviolet rays, radio waves, and magnetism, which are modulated by 1-bit digital signals, are emitted into the air, received, demodulated, and original By acquiring a 1-bit digital signal and driving a speaker with this digital signal, both the transmission side and the reception side can be configured with a very simple circuit as shown in FIG.

In addition, as another conventional technique, a transceiver (COBIT) in which infrared rays are AM-modulated and transmitted and received by a solar cell has been introduced (for example, see Non-Patent Document 1). As shown in FIG. 16, COBIT amplifies an input analog signal 60 with power AMP 61 and causes light emitting diode 62 to emit light. In the transmitter, the intensity of infrared light is intensity-modulated (AM-modulated) by an input analog and transmitted. On the receiving side, the solar cell 63 receives the intensity-modulated infrared light. Since the solar cell 63 generates a current proportional to the intensity of the infrared light, the speaker 64 is driven by this current to generate sound.
JP-A-8-37502 Reference "Various power-free small information terminals for interactive information support"

  By the way, in the above-described prior art (Patent Document 1), by using a 1-bit data string by a noise shaping method for audio digital communication, a large-scale synchronous reproduction means and D / A conversion means that require high performance characteristics are provided. It becomes possible to make it unnecessary. However, with the above configuration, only one piece of audio information can be sent with radio waves or light of one frequency, and if a large number of pieces of information are transmitted at the same time, all information is mixed on the receiving side. However, there is a problem that information on a large number of channels cannot be transmitted by radio waves or light of one frequency.

  Also in the configuration of the above-described prior art (Non-patent Document 1), only one piece of audio information can be sent with infrared of one frequency, and if a large number of pieces of information are transmitted at the same time, all information is mixed on the receiving side. In other words, there is a problem that information of a large number of channels cannot be transmitted by infrared rays of one frequency.

  As described above, in the communication technique using light or infrared rays, the multiplexing of two or more channels has a drawback in that the number of circuits is increased, the size of the casing is increased, and the power consumption is increased.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a multi-channel communication capable of realizing multi-channel communication without adding an electronic circuit and without causing an increase in power or an increase in size of a housing. It is to provide a transmission / reception method and apparatus.

  In order to solve the above-mentioned problems, the present invention provides first and second light emitting means for inputting an analog signal, modulating the intensity of the light with an analog signal intensity with respect to light such as visible light, ultraviolet light, and infrared light and outputting the light. And a polarizing means corresponding to each of the first and second light emitting means and passing only one direction of the light output from the first and second light emitting means in the vertical direction or the horizontal direction. And a second transmission means, a first input signal is input to the first light emitting means, polarized light in only a vertical direction is output from the first transmission means, and the second light emission means A second input signal is input to the light emitting means, and polarized light only in the horizontal direction is output from the second transmitting means.

  In order to solve the above-described problems, the present invention provides a noise shaping A / D converter that converts an analog signal into a 1-bit digital signal, or a digital coded signal of an analog signal that is input as PCM data or the like. The first and second 1-bit quantizers corresponding to the first and second 1-bit quantizers, each of which includes a noise shaping quantizer for converting to a signal, and the first and second 1-bit quantizers, respectively. Corresponding to each of the first and second light emitting means, which outputs the visible light, ultraviolet light, and infrared light as inputs, and the first and second light emitting means, respectively. The first and second transmission means having polarization means for passing only one vertical or horizontal direction of the light output from the light emitting means, and the first 1b. A first input signal is input to the t quantizing unit, and polarized light in only a vertical direction is output from the first transmitting unit via the first light emitting unit, and the second 1-bit quantization is performed. A second input signal is input to the means, and polarized light only in the horizontal direction is output from the second transmitting means via the second light emitting means.

  In order to solve the above-described problems, the present invention provides first and second 1-bit quantizing means for converting an analog signal such as speech or music or a digital signal obtained by digitizing speech into a 1-bit digital signal by a noise shaping method. Corresponding to each of the first and second 1-bit quantizing means, a high level for 1 of the digital signal converted by the first and second 1-bit quantizing means, and a low level for 0 The first and second return zero means that correspond to the level output, set the pulse width at the High level to 10% or more and less than 90%, and output the signal as it is at the Low level; Corresponding to each of the first and second return zero means, the output from the first and second return zero means is visible light, ultraviolet light The first and second light emitting means for outputting in the infrared, and the vertical and horizontal directions of the light output from the first and second light emitting means, corresponding to each of the first and second light emitting means First and second transmission means having polarization means that pass only in one direction, a first input signal is input to the first 1-bit quantization means, and the first return zero means and the first Via the first light emitting means, the first transmitting means outputs polarized light only in the vertical direction, the second 1-bit quantization means receives a second input signal, and the second The polarized light in only the horizontal direction is output from the second transmitting means through the return zero means and the second light emitting means.

  In the present invention, the pulse width is 50% or less, the output pulse of the first return zero means is arranged in the first half of one sampling time, and the output of the second return zero means is By arranging the pulse in the first half of one sampling time, the high part of the pulse of the output of the first and second return zero means is not overlapped.

  In order to solve the above-described problems, the present invention receives polarization light that passes only one direction of visible light, ultraviolet light, and infrared light in the vertical direction or horizontal direction, and receives visible light, ultraviolet light, and infrared light output from the polarization means. It is characterized by comprising receiving means, sound output means for converting an electrical signal into a sound signal, and drive means for driving the sound output means with a signal output from the receiving means.

  In order to solve the above-described problems, the present invention provides first and second light emitters that receive an analog signal and modulate and output the light with an analog signal intensity with respect to light such as visible light, ultraviolet light, and infrared light. And a polarization means corresponding to each of the first and second light emitters and passing only one direction of the light output from the first and second light emitters in the vertical direction or the horizontal direction. And a second transmitter, wherein a first input signal is input to the first light emitter, light vertically polarized from the first transmitter is output, and the second transmitter is output. A second input signal is input to the light emitter, and polarized light only in the horizontal direction is output from the second transmission means.

  In order to solve the above-described problems, the present invention provides a noise shaping A / D converter that converts an analog signal into a 1-bit digital signal, or a digital coded signal of an analog signal that is input as PCM data or the like. First and second 1-bit quantizers corresponding to the first and second 1-bit quantizers each including a noise shaping quantizer for converting into a signal, and the first and second 1-bit quantizers. The first and second outputs light when the output of the first and second 1-bit quantizers is 1 when visible light, ultraviolet light, and infrared light are input, and when the output is 0, no light is emitted. Corresponding to each of the first and second light emitters, and passes only one direction of light output from the first and second light emitters in the vertical direction or the horizontal direction. First and second transmitters having an optical device, a first input signal is input to the first 1-bit quantizer, and the first transmission is performed via the first light emitter. Output polarized light only in the vertical direction from the transmitter, input a second input signal to the second 1-bit quantizer, and horizontally from the second transmitter via the second light emitter. It outputs polarized light only in the direction.

  In order to solve the above-described problems, the present invention provides first and second 1-bit quantizers that convert an analog signal such as speech or music or a digital signal obtained by digitizing speech into a 1-bit digital signal using a noise shaping method. Corresponding to each of the first and second 1-bit quantizers, a high level for 1 of the digital signal converted by the first and second 1-bit quantizers, and a low level for 0 The first and second return zero devices that correspond to the level output, set the pulse width at the High level to 10% or more and less than 90%, and output the signal as it is at the Low level, Corresponding to each of the first and second return zero devices, the output from the first and second return zero devices is visible light, ultraviolet light, infrared light. The first and second light emitters that emit light when the outputs of the first and second 1-bit quantizers are 1 and emit light when they are 0, and the first and second light emitters And a first transmitter and a second transmitter having polarizers that pass only one direction of the light output from the first and second light emitters in the vertical direction or the horizontal direction, respectively. 1 1-bit quantizer receives a first input signal, and polarized light only in the vertical direction from the first transmitter via the first return zero means and the first light emitter. And a second input signal is input to the second 1-bit quantizer, and the horizontal direction from the second transmitter through the second return zero means and the second light emitter. Only polarized light is output.

  Further, the present invention is the above invention, wherein the pulse width is 50% or less, the pulse of the output of the first return zero device is arranged in the first half of one sampling time, and the output of the second return zero device is By arranging the pulses in the first half of one sampling time, the high portions of the pulses of the outputs of the first and second return zero devices are prevented from overlapping.

  In order to solve the above-described problems, the present invention receives a polarizer that passes only one vertical or horizontal direction of visible light, ultraviolet light, and infrared light, and receives visible light, ultraviolet light, and infrared light output from the polarizer. A receiver, a sound output device that converts an electrical signal into a sound signal, and a driver that drives the sound output device with a signal output from the receiver.

  According to this invention, a first input signal is inputted to the first light emitting means, light polarized in only the vertical direction is outputted from the first transmitting means, and the second light emitting means is outputted to the second light emitting means. Since the second input signal is inputted and the polarized light in only the horizontal direction is outputted from the second transmission means, the increase in power and the enlargement of the casing are not caused without adding an electronic circuit. In addition, an advantage that multi-channel communication can be realized is obtained.

  Further, according to the present invention, the first input signal is input to the first 1-bit quantizing unit, and the first transmitting unit is polarized only in the vertical direction from the first transmitting unit. Output light, input a second input signal to the second 1-bit quantization means, and output polarized light only in the horizontal direction from the second transmission means via the second light-emitting means Thus, there is an advantage that multi-channel communication can be realized without adding an electronic circuit and without causing an increase in power and an increase in size of the housing.

  According to the present invention, the first input signal is input to the first 1-bit quantizing unit, and the first transmission is transmitted via the first return zero unit and the first light emitting unit. Means for outputting polarized light only in the vertical direction, inputting a second input signal to the second 1-bit quantizing means, via the second return zero means and the second light emitting means. Since the polarized light in only the horizontal direction is output from the second transmission means, multi-channel communication can be realized without adding an electronic circuit and without causing an increase in power and an increase in size of the housing. The advantage that it can be obtained.

  According to the present invention, the pulse width is 50% or less, the output pulse of the first return zero means is arranged in the first half of one sampling time, and the output pulse of the second return zero means is 1 By arranging it in the first half of the sampling time, the high part of the pulse of the output of the first and second return zero means is not overlapped. Therefore, without adding an electronic circuit, increase in power and enlargement of the housing The advantage is that multi-channel communication can be realized without inviting the network.

  Also, according to the present invention, the polarizing means passes only one direction of visible light, ultraviolet light and infrared light in the vertical direction or horizontal direction, and the visible light, ultraviolet light and infrared light output from the polarizing means are received by the receiving means, Since the sound output means is driven by the signal output from the reception means by the drive means, multi-channel communication is realized without adding an electronic circuit and without causing an increase in power and an increase in size of the housing. The advantage that it can be obtained.

  According to the present invention, the first light emitter receives a first input signal, and the first transmitter outputs light polarized in the vertical direction only, and the second light emitter. Since the second input signal is input and the polarized light in only the horizontal direction is output from the second transmission means, it is possible to increase the power and increase the size of the housing without adding an electronic circuit. There is an advantage that multi-channel communication can be realized without inviting.

  Further, according to the present invention, a first input signal is input to the first 1-bit quantizer, and polarized in the vertical direction only from the first transmitter via the first light emitter. Output light, input a second input signal to the second 1-bit quantizer, and output polarized light only in the horizontal direction from the second transmitter via the second light emitter Thus, there is an advantage that multi-channel communication can be realized without adding an electronic circuit and without causing an increase in power and an increase in size of the housing.

  Further, according to the present invention, the first input signal is input to the first 1-bit quantizer, and the first transmission is performed via the first return zero means and the first light emitter. Output polarized light only in the vertical direction from the output device, input a second input signal to the second 1-bit quantizer, and pass through the second return zero means and the second light emitter. Since the second transmitter outputs only polarized light in the horizontal direction, multi-channel communication can be realized without adding an electronic circuit and without increasing power and increasing the size of the housing. The advantage that it can be obtained.

  Further, according to the present invention, the pulse width is set to 50% or less, the output pulse of the first return zero device is arranged in the first half of one sampling time, and the output pulse of the second return zero device is set to 1 By arranging it in the first half of the sampling time, the high part of the pulse of the output of the first and second return zero devices is prevented from overlapping, so there is no need to add an electronic circuit and increase the power and the size of the housing The advantage is that multi-channel communication can be realized without inviting the network.

  Further, according to the present invention, the polarizer allows the visible light, ultraviolet rays, and infrared rays to pass through only one direction in the vertical direction or the horizontal direction, and the visible light, ultraviolet rays, and infrared rays output from the polarizer are received by the receiver. Since the sound output device is driven by the signal output from the receiver by the driver, multi-channel communication is realized without increasing the power and increasing the size of the housing without adding an electronic circuit. The advantage of being able to do is obtained.

  Hereinafter, a multiplexed audio transmission / reception method and a multiplexed audio transmission / reception device according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic block diagram showing a multiplex audio transmitting apparatus according to the first embodiment of the present invention. In the figure, for two audio signal inputs 70 and 71, visible light or infrared light intensity-modulated by the input signals is output by the light emitting means 72 and 73, respectively. The output of the light emitting means 72 is output via the vertical polarizing means 74, and the output of the light emitting means 73 is output via the horizontal polarizing means 75. This is output to the same location. As a result, a visible light or infrared light output modulated by the audio signal 70 in the vertical direction and the audio signal 71 in the horizontal direction is obtained.

  FIG. 2 is a schematic block diagram showing a multiplex voice transmitting apparatus according to the second embodiment of the present invention. In the figure, 1-bit quantizing means 12A, B for converting analog signals 11A, 11B such as voice or music into a 1-bit digital signal by a noise shaping method, and outputting the 1-bit digital signal with light such as infrared light and visible light. 1-bit transmission means 13A and 13B, and one has vertical polarization means 74 for light output and the other has horizontal polarization means 75.

  Here, the optical output of one 1-bit transmission means 13A is output via the vertical polarization means 74, and the optical output of the other 1-bit transmission means 13B is the same as the output of the vertical polarization means 74 via the horizontal polarization means 75. Output to the location. As a result, a visible light or infrared light output modulated with the first audio signal in the vertical direction and the second audio signal in the horizontal direction is obtained.

  FIG. 3 is a schematic block diagram showing a multiplex audio transmitting apparatus according to the third embodiment of the present invention. 1-bit quantizing means 12A, 12B for converting analog signals 11A, 11B such as voice or music into a 1-bit digital signal by a noise shaping method; high level for 1 of 1-bit converted digital signal; low for 0 Return zero signals 91A and 91B that correspond to level outputs, set the pulse width at High level to 10% or more and less than 90% and output as it is at Low, and the return zero means 1-bit transmission means 13A and 13B for outputting an output signal as light such as infrared light and visible light, and one has vertical polarization means 74 for light output and the other has horizontal polarization means 75.

  Here, the optical output of one 1-bit transmission means 13A is output via the vertical polarization means 74, and the optical output of the other 1-bit transmission means 13B is the same as the output of the vertical polarization means 74 via the horizontal polarization means 75. Output to the location. As a result, pulsed visible light or infrared light output modulated with the first audio signal in the vertical direction and the second audio signal in the horizontal direction is obtained.

  FIG. 4 is a schematic block diagram showing a multiplex voice transmitting apparatus according to the fourth embodiment of the present invention. 1-bit quantizing means 12A, 12B for converting analog signals 11A, 11B such as voice or music into a 1-bit digital signal by a noise shaping method; high level for 1 of 1-bit converted digital signal; low for 0 The output of the level is made to correspond to a return zero signal with a pulse width of 10% or more and less than 50% at the High level, the signal is output as it is when it is Low, and the first half of the output timing when the control signal is High In the second half, the second half is set to the low level, and when the control signal is low, the low level is outputted in the first half of the output timing, and the second half outputs the pulse, and the output of the return zero means 1-bit transmission means 13A, 13B for outputting a signal with light such as infrared light and visible light A, and one for the control signal of the return-to-zero means and high, and the vertical polarization means 74 to the light output and the other to the control signal of the return-to-zero means and low, and has a horizontal polarization means 75.

  Here, the optical output of one 1-bit transmission means 13A is output via the vertical polarization means 74, and the optical output of the other 1-bit transmission means 13B is the same as the output of the vertical polarization means 74 via the horizontal polarization means 75. Output to the location. As a result, a pulsed visible light or infrared light output is obtained which is modulated by the first audio signal in the vertical direction and the second audio signal in the horizontal direction, and the pulses do not overlap in the vertical and horizontal directions. FIG. 5 shows the pulse output timing of the return zero means 101A and the return zero means 101B, and the pulse width of the return zero signal at 25%.

  FIG. 6 is a schematic block diagram showing a multiplex voice receiving apparatus according to the fifth embodiment of the present invention and according to the first to fourth embodiments described above. Visible light or infrared light obtained by mixing the vertically polarized light and the horizontally polarized light generated in the first to fourth embodiments described above is received by the infrared light receiving means 122 through the polarizing means 121, and this is driven by the speaker 124. The audio signal is reproduced by driving the speaker 124 by the output from the speaker driving unit 123 and driving the speaker 124 by the output of the speaker driving unit 123.

  At this time, if a vertical polarization unit is used as the polarization unit 121, only a vertically polarized signal of visible light or infrared rays, which is a mixture of the vertical polarization and the horizontal polarization generated in the first to fourth embodiments, is obtained. Played. On the other hand, when a horizontal polarization unit is used as the light polarization unit 121, only a horizontally polarized signal of visible light or infrared rays, which is a mixture of the vertical polarization and the horizontal polarization generated in the first to fourth embodiments described above, is obtained. Played.

  FIG. 7 is a block diagram showing a specific configuration example of the first embodiment described above, which is the sixth embodiment of the present invention. With respect to the two audio signal inputs 70 and 71, the power amplifiers 131 and 132 amplify the signals, and the light-emitting diodes 133 and 134 emit light by using the outputs of the amplifiers as power sources, and the intensity-modulated visible light or infrared light is emitted from the light-emitting diode 133. , 134. The output of the light emitting diode 133 is output through the vertical polarizing plate 135, and the output of the light emitting diode 134 is output through the horizontal polarizing plate 136. This is output to the same location. As a result, a visible light or infrared light output that is intensity-modulated by the audio signal 70 in the vertical direction and the audio signal 71 in the horizontal direction is obtained.

  FIG. 8A is a block diagram showing a specific configuration example of the first embodiment described above according to the seventh embodiment of the present invention. A / D converters 142A... Convert analog signals 141A, 14B such as voice or music into 1-bit digital signals by a noise shaping method. 142B and a light emitting diode or IrDA transmitter unit 143A, 143B that outputs this 1-bit digital signal with infrared light, visible light, or the like, and one has a vertical polarizing plate 144 and the other has a horizontal polarizing plate 145. .

  Here, the light output of one light emitting diode 143A is output through the vertical polarizing plate 144, and the light output of the other light emitting diode 143B is output through the horizontal polarizing plate 145 to the same location as the output of the vertical polarizing plate 144. To do. As a result, a visible or infrared pulse output modulated with the first audio signal in the vertical direction and the second audio signal in the horizontal direction is obtained. FIG. 8B shows a configuration example of the infrared transmitters 143A and 143B. The input signal 146 is connected to the input of the inverter 137, and the gate of the transistor 148 is controlled by the output of the inverter 137 to turn the transistor on or off. This can be realized by causing the light emitting diode 134 to emit light.

  FIG. 9A is a block diagram showing a specific configuration example of the third embodiment described above, which is the eighth embodiment of the present invention. A / D converters 142A and 142B for converting analog signals 141A and 141B such as voice or music into a 1-bit digital signal by a noise shaping method, and a high level for 0 of 1 of the 1-bit converted digital signal Return zero circuits 151A and 151B which correspond to low level output, set a return zero signal whose pulse width at high level is 10% or more and less than 90%, and output at low level, and this return zero means Are transmitted by light such as infrared light and visible light, and infrared transmitters (light emitting diodes) 143A and 143B are provided, one of which has a vertical polarizing plate 144 and the other has a horizontal polarizing plate 145.

  Here, the optical output of one infrared transmitter (light emitting diode) 143A is output via the vertical polarizing plate 144, and the optical output of the other infrared transmitter (light emitting diode) 143B is output via the horizontal polarizing plate 145 above. Output to the same location as the output of the vertical polarizing plate 144.

  As a result, a pulsed visible light or infrared light output modulated with the first audio signal in the vertical direction and the second audio signal in the horizontal direction is obtained. FIG. 9B is an implementation example of the return zero circuit, which drives the noise shaping circuit and defines the output data of the noise shaping A / D converter and the output of the noise shaping A / D converter. Return zero data can be generated by taking a logical product (AND) with the data (input data of the return zero circuit) 152. FIG. 9C shows the relationship between the input data 152, the clock 154, and the turn zero data.

  FIG. 10 is a block diagram showing a specific configuration example of the fourth embodiment described above, which is the ninth embodiment of the present invention. A / D converters 142A and 142B for converting analog signals 141A and 141b such as voice or music into a 1-bit digital signal by a noise shaping method, a high level for 1 of 1-bit converted digital signal, and a 0 for Corresponding to low level output, the pulse width at high level is 10% or more and less than 50%, a return zero signal is output when it is low, and when the control signal is high, the output timing A return zero circuit 161A, 161B that outputs a pulse in the first half, outputs a low level in the first half of the output timing when the control signal is low, and outputs a pulse in the second half, and this return zero means Infrared transmitter (light-emitting diode) that outputs output signals with infrared or visible light 143A, having 143B, and one for the control signal of the return-to-zero circuit and high, and one vertical polarizer 144, the other with a horizontal polarizer 145.

  Here, the optical output of one infrared transmitter (light emitting diode) 143A is output via the vertical polarizing plate 144, and the optical output of the other infrared transmitter (light emitting diode) 143B is output via the horizontal polarizing plate 145 above. Output to the same location as the output of the vertical polarizing plate 144.

  As a result, a pulsed visible light or infrared light output that is modulated by the first audio signal in the vertical direction and the second audio signal in the horizontal direction and that does not overlap in the vertical and horizontal directions is obtained. Thereby, a pulse timing equivalent to the pulse output timing shown in FIG. 5 is obtained. Further, the return zero circuit having the control signal used here can be realized by the circuit example shown in FIG. The doubler circuit 175 of this circuit is a circuit that generates a clock having a frequency twice that of the data clock 171.

  Next, FIG. 12 is a block diagram of a specific configuration example of the fifth embodiment described above, which is the tenth embodiment of the present invention. Visible light or infrared light obtained by mixing the vertically polarized light and the horizontally polarized light generated in the first to fourth embodiments described above is received by the infrared light receiver 182 such as a solar cell or a light receiving diode via the optical polarizing plate 181. This is input to the speaker drive circuit 183 that drives the speaker 184, and the speaker 184 is driven by the output of the speaker drive circuit 183 to reproduce the audio signal. At this time, if the vertical polarizing plate 144 is used as the optical polarizing plate 181, only the vertically polarized signal of visible light or infrared rays, which is a mixture of the vertical polarized light and the horizontal polarized light generated in the first to fourth embodiments described above, is used. When the horizontal polarizing plate 145 is used, only visible light or infrared horizontally polarized signals obtained by mixing the vertical polarization and the horizontal polarization generated in the first to fourth embodiments are reproduced. .

  Next, FIG. 13 is a schematic block diagram showing a multiplex voice receiving apparatus according to the eleventh embodiment of the present invention, according to the first to fourth embodiments described above. In FIG. 13, visible light or infrared light obtained by mixing the vertically polarized light and the horizontally polarized light generated in the first to fourth embodiments described above is used as the polarizing plate 181, either the vertical polarizing plate 144 or the horizontal polarizing plate 145. The light is received by the solar cell 191 as a light receiver, and the speaker 184 is directly driven by the power generated by the solar cell 191 to reproduce the audio signal. At this time, when the vertical polarization plate 144 is used as the polarization plate 181, only the vertically polarized signal of visible light or infrared light, which is a mixture of the vertical polarization and the horizontal polarization generated in the first to fourth embodiments described above, is obtained. When the horizontal polarizing plate 145 is used as the polarizing plate 181 that has been reproduced, only the horizontally polarized signal of visible light or infrared light, which is a mixture of the vertically polarized light and the horizontally polarized light generated in the first to fourth embodiments described above, is obtained. Played.

  FIG. 14 is a schematic block diagram showing a multiplex audio receiving apparatus according to the twelfth embodiment of the present invention, according to the first to fourth embodiments described above. In FIG. 14, visible light or infrared light obtained by mixing the vertically polarized light and the horizontally polarized light generated in the first to fourth embodiments described above is used as the polarizing plate 181, either the vertical polarizing plate 144 or the horizontal polarizing plate 145. Then, the light receiving diode 201 serves as a light receiver, and the speaker 184 is driven by the inverter output of the speaker driving circuit to reproduce the audio signal. At this time, when the vertical polarization plate 144 is used as the polarization plate 181, only the vertically polarized signal of visible light or infrared light, which is a mixture of the vertical polarization and the horizontal polarization generated in the first to fourth embodiments described above, is obtained. When the horizontal polarizing plate 145 is used as the polarizing plate 181 that has been reproduced, only the horizontally polarized signal of visible light or infrared light, which is a mixture of the vertically polarized light and the horizontally polarized light generated in the first to fourth embodiments described above, is obtained. Played.

  The major difference between the present invention and the prior art is that two sets of optical communication devices that can communicate only with one channel are used, and a vertical polarizing plate and a horizontal polarizing plate are combined to add a new function to the circuit of the optical communication device. It is possible to make two channels. Using the present invention, two sets of transmitters have a vertical polarizer and a horizontal polarizer, and a receiver has either a vertical polarizer or a horizontal polarizer, so either of the two sets of transmitters. Only the signal can be received. In addition, vertical polarization and horizontal polarization can be switched by rotating the polarizing plate on the receiving side by 90 degrees, and it has an advantage that it is possible to easily select which of the two sets of transmitter signals is received on the receiving side.

1 is a schematic block diagram illustrating a multiplex audio transmission apparatus according to a first embodiment of the present invention. It is a schematic block diagram which shows the multiplex audio | voice transmission apparatus by 2nd Embodiment of this invention. It is a schematic block diagram which shows the multiplex audio | voice transmission apparatus by 3rd Embodiment of this invention. It is a schematic block diagram which shows the multiplex audio | voice transmission apparatus by 4th Embodiment of this invention. It is a conceptual diagram which shows the output timing of the output signal of the return zero means with a control signal terminal in 4th Embodiment. FIG. 10 is a schematic block diagram showing a multiplex audio receiving apparatus according to the fifth embodiment of the present invention, according to the first to fourth embodiments described above. FIG. 9 is a block diagram illustrating a specific configuration example of the first embodiment described above and a circuit diagram illustrating a configuration example of an infrared transmitter according to the sixth embodiment of the present invention. FIG. 10 is a block diagram showing a specific configuration example of the first embodiment described above, which is the seventh embodiment of the present invention. FIG. 10 is a block diagram illustrating a specific configuration example of the third embodiment described above, a circuit diagram of a return zero circuit, and a timing chart according to the eighth embodiment of the present invention. It is 9th Embodiment of this invention and is a block diagram which shows the specific structural example of 4th Embodiment mentioned above. It is a circuit diagram which shows the structural example of the return zero circuit with a control signal terminal by 9th Embodiment of this invention. It is a 10th embodiment of the present invention and is a block diagram of a concrete example of composition of a 5th embodiment mentioned above. FIG. 12 is a schematic block diagram showing a multiplex audio receiving apparatus according to the eleventh embodiment of the present invention, according to the first to fourth embodiments described above. It is a twelfth embodiment of the present invention, and is a schematic block diagram showing a multiplex audio receiving apparatus according to the first to fourth embodiments described above. It is a block diagram which shows the structure which implement | achieves the communication method using 1 bit quantization by a prior art. It is a block diagram which shows the structure which implement | achieves the communication method using AM modulation by a prior art.

Explanation of symbols

60 Input signal 61 Power amplifier 62 Light emitting diode 63 Solar cell 64 Speaker 70, 71 Input audio signal 72, 73 Infrared transmission means 74 Vertical polarization means 75 Horizontal polarization means 11A, 11B Input audio signals 12A, 12B 1-bit quantization means 13A, 13B Infrared transmitting means 91A, 91B Return zero means 101A, 101B Return zero means with control signal terminal 121 Polarizing means 122 Infrared receiving means 123 Speaker driving means 124 Speaker 131, 132 Power amplifier 133, 134 Light emitting diode 135 Vertical polarizing plate 136 Horizontal polarizing plate 137 Inverter 141A, 141B Input audio signal 142A, 142B Noise shaping A / D converter 143A, 143B Infrared transmitter 144 Vertical polarizing plate 145 Horizontal polarizing plate 146 Signal input 148 Transistor 149 Power supply 151A, 151B Return zero circuit 152 Input data 154 A / D converter clock 153 AND 155 Return zero output 161A, 161B Return zero circuit with control signal terminal 171 Data clock 172 Input data 173 Control input 174 Return Zero output 175 Double multiplier 176 AND
177 AND
178 Inverter 179 OR
181 Polarizing plate 182 Infrared light receiver 183 Speaker driving circuit 184 Speaker 191 Solar cell 201 Light receiving diode 202 Inverter 203 Resistance 204 Filter 205 Power supply

Claims (10)

First and second light emitting means for inputting an analog signal, modulating the light with an analog signal intensity with respect to light such as visible light, ultraviolet light, and infrared light, and outputting the light;
Polarizing means corresponding to each of the first and second light emitting means and having only one direction of the vertical or horizontal direction of the light output from the first and second light emitting means. 2 transmission means,
The first light emitting means receives a first input signal, the first transmitting means outputs only vertically polarized light, and the second light emitting means receives a second input signal. A multiplex audio transmission method comprising: inputting and outputting polarized light only in a horizontal direction from the second transmission means. A noise shaping A / D converter that converts an analog signal into a 1-bit digital signal, or a noise shaping quantizer that converts a digitally encoded signal of an analog signal input as PCM data into a 1-bit digital signal. And a second 1-bit quantization means;
The first and second 1-bit quantizing means correspond to each of the first and second 1-bit quantizing means, and the outputs of the first and second 1-bit quantizing means are input and output as visible light, ultraviolet light, and infrared light. Two light emitting means;
Corresponding to each of the first and second light-emitting means, the first and second light-polarizing means that pass only one direction of the light output from the first and second light-emitting means in the vertical direction or the horizontal direction. 2 transmission means,
A first input signal is input to the first 1-bit quantization unit, and polarized light in only a vertical direction is output from the first transmission unit via the first light-emitting unit, and the second A second input signal is input to the 1-bit quantizing means, and polarized light only in the horizontal direction is output from the second transmitting means via the second light emitting means. Transmission method. First and second 1-bit quantization means for converting an analog signal such as voice or music or a digital signal obtained by digitizing voice into a 1-bit digital signal by a noise shaping method;
Corresponding to each of the first and second 1-bit quantization means, the digital signal 1-bit converted by the first and second 1-bit quantization means has a high level for 1 and a low level for 0 First and second return zero means for making outputs correspond to return zero signals having a pulse width of 10% or more and less than 90% at high level, and outputting them as they are at low level;
Corresponding to each of the first and second return zero means, first and second light emitting means for outputting the output from the first and second return zero means as visible light, ultraviolet light, and infrared light; and
Corresponding to each of the first and second light emitting means, the first and second polarizing means have a polarizing means that allows light output from the first and second light emitting means to pass only in one direction in the vertical or horizontal direction. Transmission means,
A first input signal is input to the first 1-bit quantizing means, and polarized in the vertical direction only from the first transmitting means via the first return zero means and the first light emitting means. From the second transmitting means via the second return zero means and the second light emitting means. A method of transmitting multiple voices characterized by outputting polarized light only in a horizontal direction. The pulse width is 50% or less, the output pulse of the first return zero means is arranged in the first half of one sampling time, and the output pulse of the second return zero means is arranged in the first half of one sampling time. 4. The multiplex voice transmission method according to claim 3, wherein the high portions of the pulses of the outputs of the first and second return zero means do not overlap. Polarization means that allows only one direction of visible light, ultraviolet light, and infrared light to pass in the vertical or horizontal direction;
Receiving means for receiving visible light, ultraviolet light and infrared light output from the polarizing means;
Sound output means for converting electrical signals into sound signals;
Driving means for driving the sound output means with the signal output from the receiving means;
A multiplex voice receiving method comprising: First and second light emitters for inputting an analog signal and modulating and outputting the light with an analog signal intensity with respect to light such as visible light, ultraviolet light, and infrared light;
Polarizing means corresponding to each of the first and second light emitters and having only one vertical or horizontal direction of light output from the first and second light emitters. 2 transmitters,
The first light emitter receives a first input signal, the first transmitter outputs light polarized in the vertical direction only, and the second light emitter receives a second input signal. A multiplex voice transmitting apparatus, characterized in that it inputs and outputs polarized light only in the horizontal direction from the second transmitting means. A noise shaping A / D converter that converts an analog signal into a 1-bit digital signal, or a noise shaping quantizer that converts a digitally encoded signal of an analog signal input as PCM data into a 1-bit digital signal. And a second 1-bit quantizer;
Corresponding to each of the first and second 1-bit quantizers, the outputs of the first and second 1-bit quantizers are input, and these are input to the first and second as visible light, ultraviolet light, and infrared light. First and second light emitters that emit light when the output of the 1-bit quantizer is 1 and emit light when it is 0; and
The first and second polarizers each having a polarizer corresponding to each of the first and second light emitters and passing only one direction of the light output from the first and second light emitters in a vertical direction or a horizontal direction. 2 transmitters,
A first input signal is input to the first 1-bit quantizer, and polarized light in only a vertical direction is output from the first transmitter via the first light emitter, and the second light is output from the first transmitter. A second input signal is input to the 1-bit quantizer, and polarized light in only the horizontal direction is output from the second transmitter via the second light emitter. Transmitter device. First and second 1-bit quantizers for converting an analog signal such as voice or music or a digital signal obtained by digitizing voice into a 1-bit digital signal by a noise shaping method;
Corresponding to each of the first and second 1-bit quantizers, the digital signal 1-bit converted by the first and second 1-bit quantizers has a high level for 1 and a low level for 0 First and second return zero devices that correspond to outputs, set the pulse width at High level to 10% or more and less than 90%, and output as it is when Low,
Corresponding to each of the first and second return zero devices, the output from the first and second return zero devices is visible light, ultraviolet light, infrared light, and the first and second 1-bit quantizers. First and second light emitters that emit light when the output is 1 and emit light when the output is 0;
First and second polarizers corresponding to each of the first and second light emitters and having polarizers that allow light output from the first and second light emitters to pass only in one direction in a vertical direction or a horizontal direction. With a transmitter of
A first input signal is input to the first 1-bit quantizer and is polarized in the vertical direction only from the first transmitter via the first return zero means and the first light emitter. From the second transmitter through the second return zero means and the second light emitter. A multiplex voice transmitting apparatus that outputs polarized light only in a horizontal direction. The pulse width is 50% or less, the output pulse of the first return zero device is arranged in the first half of one sampling time, and the output pulse of the second return zero device is arranged in the first half of one sampling time. 9. The multiple voice transmitting apparatus according to claim 8, wherein high portions of pulses of the outputs of the first and second return zero devices do not overlap. A polarizer that passes only one vertical or horizontal direction of visible light, ultraviolet light, infrared light, and
A receiver that receives visible light, ultraviolet light, and infrared light output from the polarizer;
A sound output device for converting an electrical signal into a sound signal;
And a driver that drives the sound output device with a signal output from the receiver.

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