JP5106664B1 - Transmission device, reception device, transmission method, reception method, communication system, communication method, and program - Google Patents

Abstract

Provided is a technique capable of exchanging information between nearby devices without adding a special communication device.
A transmission apparatus includes means for acquiring transmission data, encoding means for outputting output audio data in PCM format obtained by encoding the transmission data, and converting the output audio data to a DA converter. Output means for outputting a sound corresponding to the output sound data to a speaker. The receiving device includes input means for acquiring input voice data in PCM format indicating voice input to the microphone via an AD converter, and decoding means for decoding the transmission data based on the input voice data. .
[Selection] Figure 2

Description

  The present invention relates to a transmission device, a reception device, a transmission method, a reception method, a communication system, a communication method, and a program.

  Conventionally, when exchanging information between relatively close apparatuses, devices such as infrared communication are often used. For example, many conventional mobile phones have a function of exchanging information such as a contact information through a device for infrared communication. Patent Document 1 describes a technique for transmitting and receiving information between mobile phones using infrared communication.

JP-A-11-154916

  When a special device such as infrared communication is used to communicate between nearby devices, the device on the transmitting side and the device on the receiving side must be equipped with the device. For example, in recent years, devices such as smartphones that do not have an infrared communication function are rapidly spreading, and it is difficult to exchange information between nearby smartphones and the like. Although it is conceivable to use radio waves such as a wireless LAN as a communication method, it is difficult to specify a communication partner based on a positional relationship, so that security and convenience problems are likely to occur.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a technology capable of exchanging information between nearby devices without adding a special communication device. .

  In order to solve the above-mentioned problems, a transmitting apparatus according to the present invention includes a means for acquiring transmission data, an encoding means for outputting output audio data in PCM format obtained by encoding the transmission data, and the output audio. Output means for outputting a sound corresponding to the output sound data to a speaker by converting the data to a DA converter.

  Further, the receiving device according to the present invention is an input means for acquiring, through an AD converter, PCM format input voice data indicating voice input to a microphone and indicating voice obtained by encoding transmission data; Decoding means for decoding the transmission data based on the input voice data.

  The transmission method according to the present invention includes a step of acquiring transmission data, an encoding step of outputting output audio data in PCM format obtained by encoding the transmission data, and the output audio data to a DA converter. And a step of causing the speaker to output a sound corresponding to the output sound data by performing the conversion.

  According to another aspect of the present invention, there is provided a receiving method for obtaining PCM format input voice data via an AD converter based on voice input to a microphone and encoded transmission data; And a decoding step of decoding the transmission data based on the input voice data.

  The program for transmission according to the present invention includes means for acquiring transmission data, encoding means for outputting output audio data in PCM format obtained by encoding the transmission data, and DA conversion of the output audio data. The computer is caused to function as output means for outputting a sound corresponding to the output sound data to a speaker by converting the sound into a device.

  Further, the reception program according to the present invention is an input means for acquiring, through an AD converter, PCM format input voice data indicating voice input to a microphone and indicating voice obtained by encoding transmission data. And a computer functioning as decoding means for decoding the transmission data based on the input voice data.

  A communication system according to the present invention includes the above-described transmission device and reception device.

  The communication method according to the present invention includes a step of acquiring transmission data, an encoding step of outputting output audio data in PCM format obtained by encoding the transmission data, and the output audio data to a DA converter. A step of causing the speaker to output a sound corresponding to the output sound data by conversion, and an input for acquiring input sound data in PCM format indicating the sound output from the speaker and input to the microphone via the AD converter And a decoding step of decoding the transmission data based on the input voice data.

  According to the present invention, a special device is obtained by using an apparatus including a speaker that emits sound according to the output of the DA converter and an apparatus including a microphone that outputs a voltage signal obtained by converting the sound into the AD converter. Information can be exchanged between these devices even without adding. For example, information can be exchanged between smartphones or between a TV and a smartphone.

  In one aspect of the present invention, the output sound data may be data indicating sound in a non-audible frequency band.

  In one aspect of the present invention, the inaudible frequency band may be 20 kHz or more.

  In one aspect of the present invention, the receiving device further includes extraction means for generating extracted voice data obtained by extracting a sound in a non-audible frequency band from the voice indicated by the input voice data, and the decoding means adds the extracted voice data to the extracted voice data. Based on this, the transmission data may be decoded.

  In one aspect of the present invention, the encoding means may output the output sound data so as to suppress a change in sound amplitude indicated by the output sound data.

  In one aspect of the present invention, the encoding means indicates the speech in which the output speech data includes a plurality of speech segments and a silent segment between adjacent speech segments according to the transmission data, and The output voice data may be output so that the voiced section includes at least one of a section where the amplitude gradually increases and a section where the amplitude gradually decreases.

  In one aspect of the present invention, a time width of each of the plurality of sound periods may be any of a predetermined number of time widths.

  In one aspect of the present invention, the decoding means is a plurality of sound segments indicated by the extracted speech data, and is based on the length of time of each of the plurality of sound segments input in order to the microphone. The transmission data may be decoded.

It is a figure which shows an example of a structure of the communication system concerning embodiment of this invention. It is a functional block diagram which shows the function of the communication system concerning embodiment of this invention. It is a figure which shows an example of the processing flow of a transmitter. It is a figure which shows the time transition of the audio | voice which output audio | speech data shows. It is a figure which shows an example of the waveform in a sound area. It is a figure which shows an example of the processing flow of a receiver. It is a figure which shows an example of the system which transmits data using the speaker of a television.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Of the constituent elements that appear, those having the same function are given the same reference numerals, and the description thereof is omitted.

  FIG. 1 is a diagram illustrating an example of a configuration of a communication system according to an embodiment of the present invention. This communication system includes a transmission device 1 and a reception device 2. The transmission device 1 includes a processor 11, a memory 12, a display operation unit 13, a DA converter 14, and a speaker 15. The reception device 2 includes a processor 21, a memory 22, a display operation unit 23, an AD converter 24, and a microphone. 25. The transmission device 1 may be any device that outputs audio to an audio speaker via the DA converter 14, and may be, for example, a smartphone or a mobile phone. The receiving device 2 may be a device that acquires data indicating sound input from a sound microphone via the AD converter 24, and may be, for example, a smartphone or a mobile phone.

  The processor 11 and the processor 21 can operate according to programs stored in the memory 12 and the memory 22, respectively. The processor 11 controls the display operation unit 13 and the DA converter 14, and the processor 21 controls the display operation unit 23 and the AD converter 24. The program may be provided via a network such as the Internet, or may be provided by being stored in a computer-readable information recording medium such as a flash memory.

  The memory 12 and the memory 22 are configured by memory elements such as RAM and flash memory, hard disk drives, and the like. The memory 12 and the memory 22 store the program. The memory 12 and the memory 22 store information input from each unit and calculation results.

  The display operation unit 13 and the display operation unit 23 are configured by means for controlling a display output device such as a liquid crystal display panel, means for controlling an input device such as a touch panel and a remote control, and the like. The display operation unit 13 and the display operation unit 23 output image data and the like to the display output device based on the control of the processor 11 and the processor 21, respectively, and acquire information from the operator (user) from the input device. .

  The DA converter 14 converts output audio data in PCM format into an output signal voltage based on the control of the processor 11. The DA converter 14 performs DA conversion using, for example, the ΔΣ method. The DA converter 14 also has a volume control function for converting the output signal voltage according to the setting by the operator.

  The speaker 15 outputs sound corresponding to the output signal voltage output from the DA converter 14. The speaker 15 is a sound output speaker, and of course can output sound in an audible frequency band.

  The microphone 25 converts input sound into an input signal voltage. When communicating with the transmission device 1, sound output from the transmission device 1 is input to the microphone 25. The microphone 25 is a microphone for voice input, and of course can also input audio in an audible frequency band.

  The AD converter 24 converts the input signal voltage into PCM format input voice data based on the control of the processor 21. The AD converter 24 performs AD conversion using, for example, the ΔΣ method.

  FIG. 2 is a functional block diagram showing functions of the communication system according to the embodiment of the present invention. The transmission apparatus 1 functionally includes a transmission data acquisition unit 31, an encoding unit 32, and an audio output unit 33. These functions are realized by the processor 11 executing a program stored in the memory 12 and controlling the DA converter 14, the display operation unit 13, and the like. In addition, the receiving device 2 functionally includes a voice input unit 41, an extraction unit 42, and a decoding unit 43. These functions are realized by the processor 21 executing a program stored in the memory 22 and controlling the AD converter 24, the display operation unit 23, and the like.

  FIG. 3 is a diagram illustrating an example of a processing flow of the transmission device 1. Below, the function which the transmission apparatus 1 has is demonstrated according to this processing flow.

  The transmission data acquisition unit 31 is realized centering on the processor 11, the memory 12, and the display operation unit 13. The transmission data acquisition unit 31 operates based on an instruction input from the user via the display operation unit 13, and acquires transmission data from information input from the display operation unit 13 or information stored in the memory 12. (Step S101). When the transmission device 1 is a smartphone, the transmission data is information such as information such as an owner's phone number or email address, or an ID for identifying the smartphone.

  The encoding unit 32 is realized centering on the processor 11 and the memory 12. The encoding unit 32 outputs output audio data in PCM format obtained by encoding transmission data.

  The format of the output audio data will be described. FIG. 4 is a diagram showing a time transition of the voice indicated by the output voice data. The audio indicated by the output audio data includes a synchronization signal 51 indicating the start of output, a synchronization signal 52 indicating the end of output, and a plurality of transmission signal sections 53 sandwiched between the synchronization signal 51 and the synchronization signal 52 in terms of time. . The plurality of transmission signal sections 53 are signals obtained by modulating transmission data. Each transmission signal section 53 is a voiced section in which sound is output, and the output sound is one of two types of predetermined sounds. Each transmission signal section 53 corresponds to one of the bit arrangements constituting the transmission data. Here, the two types of sound output to the transmission signal section 53 have different time widths. Specifically, the time width Tt1 of the transmission signal section 53 corresponding to a bit having a value of 1 is different from the time width Tt0 of the transmission signal section 53 corresponding to a bit having a value of 0. In the example of the present embodiment, the time width Tt1 is 6 ms and the time width Tt0 is 2 ms. Further, a silent section is arranged between adjacent transmission signal sections 53, and a silent section is also arranged between the synchronization signals 51 and 52 and the adjacent transmission signal section 53. The time interval Tn of the silent section is 10 ms. In the present embodiment, as long as the time width Tt1 and the time width Tt0 are different, the time widths of the time widths Tt0, Tt1, and Tn may be different from those described above.

  Next, details of the processing of the encoding unit 32 will be described. The encoding unit 32 first sets audio data indicating the synchronization signal 51 in the output audio data (step S102), and adds audio data indicating a silent period (step S103). Next, 1 is substituted into the variable i (step S104), and processing for adding a plurality of transmission signal sections 53 to the output audio data is performed.

  The encoding unit 32 acquires the i-th bit from the transmission data (step S105). Here, the transmission data is regarded as a set of n bits arranged in order. Next, voice data indicating a voiced section having a time width corresponding to the acquired bit is added to the output voice data (step S106), and voice data indicating a silent section is further added to the output voice data (step S107). ). Then, the value of the variable i is incremented by 1 (step S108), and if all (n) bits constituting the transmission data are not processed (N in step S109), the processing is repeated from step S105. If all the bits have been processed (Y in step S109), audio data indicating the synchronization signal 52 is added to the output audio data (step S110). Through these processes, the encoding unit 32 outputs output audio data that sequentially outputs audio of the type corresponding to each bit when the transmission data is a binary bit string.

  The audio output unit 33 is realized centering on the processor 11 and the memory 12. The audio output unit 33 converts the output audio data to the DA converter 14 to output the audio indicated by the output audio data to the speaker 15. Specifically, the audio output unit 33 first outputs the output audio data to the DA converter 14 (step S111), and the DA converter 14 converts the output audio data into an output signal voltage. The output signal voltage output from the DA converter 14 is input to the speaker 15, and the speaker 15 outputs sound corresponding to the output signal voltage.

  Here, the detail of the signal of a sound section is demonstrated. FIG. 5 is a diagram illustrating an example of a waveform in a sound section. The solid line indicates the waveform of the voice in the voiced section, and the broken line indicates the time change of the amplitude of the waveform. In the voiced section, sound having a frequency of a non-audible frequency band, specifically, a frequency of 20 kHz or more and a maximum frequency (about 25 kHz) that can be output is output. By using sound in a non-audible frequency band for communication, surrounding humans can be prevented from recognizing unpleasant noise. Also, the encoding unit 32 sets the output voice data so as to suppress the change in the voice amplitude in the voiced section. More specifically, each voiced section indicated by the output voice data has a section in which the voice amplitude gradually increases and a section in which the voice amplitude gradually decreases. The section where the amplitude of the voice gradually increases is a constant section after switching from the silent section to the voice section, and the section where the amplitude of the voice gradually decreases is a fixed section before switching from the voice section to the silent section It is. In the present embodiment, the amplitude of the sound section having the above-described characteristics is obtained from a sine function having a period twice as long as the time width of the sound section.

  An expression showing the waveform f (x) at time step x in the sound section is shown below. Here, the output audio data in the PCM format is 16 bits and can take values of -32768 to 32767, and one time step is a time obtained by dividing one second by the sampling rate.

  Here, γ is a value obtained by dividing the sampling rate of the output audio data by the frequency of the audio in the inaudible frequency band. The sampling rate is preferably at least twice the frequency of the non-audible frequency band used for communication and a natural number. This is because a frequency lower than the target frequency can be prevented from being output due to the difference between the sampling period and the voice period. In this embodiment, the sampling rate is 44.1 kHz and the audio frequency is 22.05 kHz. A indicates a maximum value that can be taken as data of a voiced section. B is a value obtained by dividing the sampling rate by a frequency 1000 indicating an amplitude change. In the actual output audio data, the decimal part of the value indicated by f (x) is truncated.

  The expression of f (x) is an expression obtained by applying a sine wave that suppresses a change in amplitude over time to a sine wave indicating sound in a non-audible frequency band. Thereby, the time change of an amplitude is suppressed compared with the sine wave which makes the amplitude in the sound area shown by the following formula | equation of fs (x) constant.

  Here, as described above, the speaker 15 of the transmission device 1 is an audio speaker. Therefore, when a sound in an inaudible frequency band of 20 kHz or higher is output, a change in the output signal voltage follows the physical characteristics. Unusable phenomenon may occur. When this phenomenon occurs, a sound like noise at a lower frequency is output from the speaker 15. The above phenomenon occurs almost certainly when the sound in the voiced section indicated by fs (x) is output. However, when the time variation of the amplitude is limited as in f (x), the speaker 15 outputs the output signal voltage. It will not occur because it becomes easier to follow the time change. Thereby, it is possible to greatly reduce the noise generated by the speaker 15 during communication and recognized by the user.

  Note that one transmission signal section 53 in the output audio data output from the encoding unit 32 does not necessarily represent 1-bit data. For example, four types of time widths of one transmission signal section 53 may be used, and one transmission signal section 53 may correspond to 2 bits of transmission data. Further, even if the encoding unit 32 outputs the output voice data so as to convert the transmission data into an array of k-ary (k> 3) values and output k kinds of voices corresponding to the respective values. Good.

  FIG. 6 is a diagram illustrating an example of a processing flow of the receiving device 2. Below, the function which the receiving apparatus 2 has according to this processing flow is demonstrated.

  The voice input unit 41 is realized centering on the processor 21, the memory 22, and the display operation unit 23. The voice input unit 41 acquires PCM format input voice data from the AD converter 24 based on an instruction input from the user via the display operation unit 23 (step S201). At this time, the sound output from the transmission device 1 is input to the microphone 25 so that the input sound data includes sound data obtained by encoding the transmission data. In the present embodiment, the sampling rate is the same as that of the transmission apparatus 1.

  The extraction unit 42 is realized centering on the processor 21 and the memory 22. The extraction unit 42 extracts a non-audible frequency band sound from the input sound data acquired by the sound input unit 41 (step S202), and stores data indicating the extracted sound in the memory 22. The extraction unit 42 uses a bandpass filter in order to extract sound in an inaudible frequency band. By performing this process, it is possible to remove the influence of noise such as the voices of surrounding people. If communication is performed in an environment with little noise, the input voice data may be passed to the decoding unit 43 as it is without performing this process.

  The decoding unit 43 is realized centering on the processor 21 and the memory 22. The decoding unit 43 decodes the transmission data based on the data indicating the extracted voice. First, the decoding unit 43 normalizes the amplitude of the extracted speech (step S203). Thereby, even if the magnitude of the sound input to the microphone 25 is different every time communication is performed, no problem occurs in the subsequent processing.

  Next, the decoding unit 43 detects the boundary between the voiced section and the silent section, and detects the time width of each of the plurality of voiced sections (step S204). The decoding unit 43 acquires an array of bit values according to the detected duration of each sound period (step S205), and outputs the acquired array of values to the memory 22 or the like as decoded received data. (Step S206). Here, the decoding unit 43 may improve the accuracy of the received data using a known error correction technique such as CRC correction. Further, if the type of time width of the transmission signal section 53 output by the transmission device 1 is 3 or more, the received data may be decoded by obtaining an array of values corresponding to the time width.

  If the transmitter 1 including the speaker 15 connected to the DA converter 14 and the receiver 2 including the microphone 25 connected to the AD converter 24 are provided by the above-described technique, other devices need not be added. Can also communicate. Since sound in the non-audible frequency band is more directional than radio waves, there is less risk of another device receiving the wrong transmission content, and a function to prevent interference, such as when using radio waves, is added. There is no need to complicate the operation. In addition, since non-audible frequency band audio is used and noise generation is suppressed, even though communication is performed using a speaker, a person does not recognize an unpleasant sound. . Therefore, there is little influence on the human body.

  Also, since most of the devices having the DA converter 14 and the speaker 15 can be adjusted by the user, for example, the balance between security and communication error can be arbitrarily adjusted. This is because the user may make an adjustment such that the volume is reduced when the distance between the transmission-side device and the reception-side device is short (for example, 5 cm), and the volume is increased when the distance is long (for example, 1 m).

  In the above description, the transmission data is encoded using the time width of the sound output from the transmission device 1, but the transmission data may be encoded using other modulation methods. For example, each bit of the bit array to be transmitted may be represented by a difference in sound amplitude as in the AM modulation method, or each bit of the bit array may be represented by a difference in sound frequency as in the FM modulation method. . However, using the time width of speech is more resistant to environmental changes such as noise than the former, and requires less computation for decoding than the latter.

  The communication methods described so far are particularly effective for smartphones and mobile phones. A digital-compatible portable terminal that inputs and outputs audio, such as a smartphone or a mobile phone, is always equipped with a DA converter 14 and a speaker 15 connected thereto, an AD converter 24 and a microphone 25 connected thereto. With this feature, the functions of the transmission device 1 and the reception device 2 can be realized by installing a program in a smartphone or a mobile phone. That is, communication using a mobile terminal can be realized without purchasing or connecting an external communication device. For example, even if one or both of two smartphones do not have an infrared communication function, by installing a program, e-mail address exchange, URL, Messages can be sent and received. Of course, even if there is no radio wave from the base station of the mobile phone or the base unit of the wireless LAN, such information can be exchanged. In addition, if radio waves from a base station or the like can be received, information that identifies at least one smartphone etc. is transmitted and received in a network via radio waves using communication using non-audible band audio, and more It is also possible to send and receive large data.

  So far, an example of one-to-one transmission / reception such as communication between mobile phones and smartphones has been described. However, a transmitting apparatus may transmit data to a plurality of receiving apparatuses 2. More specifically, for example, output audio data may be generated by a television station or a radio station, and audio corresponding to the output audio data may be output from a speaker of the home television 7 or the like. A plurality of mobile phones, smartphones, and the like in front of the television 7 receive the sound via the microphone 25.

  FIG. 7 is a diagram illustrating an example of a system that transmits data using a speaker of the television 7. The station side device 6 is installed in a television station. The station side device 6 includes a processor 61, a storage unit 62, and a transmission circuit 63. The television 7 includes a receiving circuit 71, a display circuit 72, a DA converter 73, and a speaker 74. A transmission system that combines the station-side device 6 and the television 7 corresponds to the transmission device 1 of FIG. The processor 61 and the storage means 62 included in the station side device 6 correspond to the processor 11 and the memory 12 included in the transmission device 1, respectively, and the DA converter 73 and the speaker 74 included in the television 7 are included in the transmission device 1, respectively. Corresponds to the DA converter 14 and the speaker 15.

  The transmission circuit 63 transmits broadcast data including video data to be displayed on the display circuit 72 of the television 7 and output audio data to be output to the speaker 73 to the plurality of televisions 7 through the antenna of the television station. The receiving circuit 71 receives broadcast data, outputs video data included in the broadcast data to the display circuit, and outputs output audio data included in the broadcast data to the DA converter 73. The display circuit 72 includes a video processing circuit, a display panel, and the like, and displays an image based on the video data. The difference between the transmission apparatus 1 shown in FIG. 1 and this transmission system is that data is transferred because the transmission circuit 63 and the reception circuit 71 exist between the processor 61, the storage means 62, and the DA converter 73. The route is longer.

  This transmission system also functionally includes a transmission data acquisition unit 31, an encoding unit 32, and an audio output unit 33. The transmission data acquisition unit 31 is realized centering on the processor 61 and the storage unit 62. The transmission data acquisition unit 31 acquires transmission data based on video data and audio data serving as content to be broadcast and a time from the beginning of the video data and audio data. The video data and audio data are stored in the storage unit 62, and the transmission data is stored in advance in the storage unit 62 in association with the video data and audio data and their time intervals.

  The encoding unit 32 is realized centering on the processor 61 and the storage unit 62. The encoding unit 32 outputs output audio data in PCM format obtained by encoding transmission data. The details are the same as those described in the transmission apparatus 1 shown in FIG.

  The audio output unit 33 is realized with the processor 61 and the storage unit 62 as the center. The audio output unit 33 generates new output audio data by mixing the output audio data output from the encoding unit 32 with the audio data serving as the content to be broadcast, and includes the new output audio data and video data. Broadcast data is output to the transmission circuit 63. By doing so, the audio output unit 33 causes the speaker 74 to output the audio indicated by the output audio data by converting the output audio data to the DA converter 73 included in the television 7. Note that the reception device 2 can decode the transmission data even if the audio data is mixed with the output audio data. This is because the influence of audio data containing almost no sound in the inaudible frequency band is reduced by the band pass filter.

  In this way, information such as the URL of the Web page for introducing information and applying for a campaign according to the content broadcast by the TV station, and information such as the program name are transmitted and received using the hardware of the existing TV 7 or smartphone. can do. The viewer of the television can acquire information that has been conventionally displayed on the screen without performing an operation such as character input, and the convenience is greatly improved. This is particularly advantageous when a mobile terminal such as a smartphone or a mobile phone is used. This is because a portable terminal cannot be equipped with a keyboard like a PC due to its size, and is not good at inputting characters.

  The station side device 6 may be placed in a radio station that performs digital broadcasting. In this case, the transmission data acquisition unit 31 acquires transmission data based on the audio data as the content to be broadcast and the time from the beginning, and the transmission circuit 63 transmits the broadcast data including the audio data. A radio compatible with digital broadcasting may receive broadcast data and output the sound from a speaker.

  DESCRIPTION OF SYMBOLS 1 Transmitter, 2 Receiver, 6 Station side apparatus, 7 Television, 11,21,61 Processor, 12,22 Memory, 13,23 Display operation part, 14,73 DA converter, 15,74 Speaker, 24 AD conversion 25, microphone, 31 transmission data acquisition unit, 32 encoding unit, 33 audio output unit, 41 audio input unit, 42 extraction unit, 43 decoding unit, 51, 52 synchronization signal, 53 transmission signal section, 62 storage unit, 63 Transmission circuit, 71 Reception circuit, 72 Display circuit, Tn, Tt0, Tt1 Time width.

Claims (12)

Means for obtaining transmission data;
Encoding means for outputting output sound data indicating sound in a non-audible frequency band, which is output sound data in PCM format obtained by encoding the transmission data;
Output means for outputting a sound corresponding to the output sound data to a speaker by converting the output sound data to a DA converter;
Including
It said encoding means indicates a voice and a silent section between the sound period to the output audio data is adjacent to the plurality of voiced section in accordance with the transmission data, and amplitude start of each chromatic sounds interval Output the output audio data so that it shows a sine curve that increases from time to time and then decreases ,
A transmission apparatus characterized by the above. The encoding means determines a time width of each of the plurality of sound sections according to the transmission data, and outputs output sound data indicating sound including the plurality of sound sections.
The transmission apparatus according to claim 1, wherein: The inaudible frequency band is 20 kHz or more,
The transmission apparatus according to claim 1 or 2 , wherein Each time width of the plurality of sound periods is one of a predetermined number of time widths,
Transmission device according to any one of claims 1 to 3, characterized in that. Obtaining transmission data; and
An encoding step of outputting output audio data indicating audio in a non-audible frequency band, which is output audio data in PCM format obtained by encoding the transmission data;
Converting the output audio data to a DA converter to output a sound corresponding to the output audio data to a speaker;
Including
In the encoding step, the output voice data indicates a voice having a plurality of voiced sections and a silent section between adjacent voiced sections according to the transmission data, and the amplitude of each voiced section starts. Output the output audio data so that it shows a sine curve that increases from time to time and then decreases ,
A transmission method characterized by the above. Means for obtaining transmission data;
PCM format output audio data obtained by encoding the transmission data, and encoding means for outputting output audio data indicating audio in an inaudible frequency band; and
An output means for outputting a sound corresponding to the output sound data to a speaker by converting the output sound data to a DA converter;
Function as a computer
It said encoding means indicates a voice and a silent section between the sound period to the output audio data is adjacent to the plurality of voiced section in accordance with the transmission data, and amplitude start of each chromatic sounds interval Output the output audio data so that it shows a sine curve that increases from time to time and then decreases ,
A program characterized by that. A voice in a non-audible frequency band that is input to a microphone and encoded with transmission data, and has a plurality of sound sections and a silent section between adjacent sound sections according to the transmission data; and Input means for acquiring, via an AD converter, PCM format input voice data indicating a voice indicating a sine curve that increases after the amplitude of each voiced section increases from the start and reaches a maximum ;
Extracting means for generating extracted voice data obtained by extracting voice in a non-audible frequency band from the voice indicated by the input voice data;
Decoding means for decoding the transmission data based on the extracted voice data;
A receiving apparatus comprising: The decoding means decodes the transmission data based on respective lengths of a plurality of sound segments indicated by the extracted voice data and sequentially input to the microphone.
The receiving apparatus according to claim 7 . A voice in a non-audible frequency band that is input to a microphone and encoded with transmission data, and has a plurality of sound sections and a silent section between adjacent sound sections according to the transmission data; and An input step of acquiring input voice data in PCM format via an AD converter based on voice indicating a sine curve that increases after the amplitude of each voiced section increases from the start and reaches a maximum ;
An extraction step of generating extracted voice data obtained by extracting voice in a non-audible frequency band from the voice indicated by the input voice data;
A decoding step of decoding the transmission data based on the extracted voice data;
A receiving method comprising: A voice in a non-audible frequency band that is input to a microphone and encoded with transmission data, and has a plurality of sound sections and a silent section between adjacent sound sections according to the transmission data; and Input means for acquiring, via an AD converter, PCM format input voice data indicating a voice indicating a sine curve that increases after the amplitude of each voiced section increases from the start and reaches a maximum ;
Extraction means for generating extracted voice data obtained by extracting voice in a non-audible frequency band from the voice indicated by the input voice data; and
Decoding means for decoding the transmission data based on the extracted voice data;
As a program to make the computer function as. A communication system including a transmission device and a reception device,
The transmitter is
Means for obtaining transmission data;
Encoding means for outputting output sound data indicating sound in a non-audible frequency band, which is output sound data in PCM format obtained by encoding the transmission data;
An output means for outputting a sound corresponding to the output sound data to a speaker by converting the output sound data to a DA converter;
Including
It said encoding means indicates a voice and a silent section between the sound period to the output audio data is adjacent to the plurality of voiced section in accordance with the transmission data, and amplitude start of each chromatic sounds interval Output the output audio data so that it shows a sine curve that increases from time to time and then decreases ,
The receiving device is:
Input means for acquiring, through an AD converter, PCM-format input sound data indicating sound output from the speaker and input to a microphone;
Extracting means for generating extracted voice data obtained by extracting voice in a non-audible frequency band from the voice indicated by the input voice data;
Decoding means for decoding the transmission data based on the extracted voice data;
including,
A communication system characterized by the above. Obtaining transmission data; and
An encoding step of outputting output audio data indicating audio in a non-audible frequency band, which is output audio data in PCM format obtained by encoding the transmission data;
Converting the output audio data to a DA converter to output a sound corresponding to the output audio data to a speaker;
An input step of acquiring, through an AD converter, input audio data in PCM format indicating the audio output from the speaker and input to the microphone;
An extraction step of generating extracted voice data obtained by extracting voice in a non-audible frequency band from the voice indicated by the input voice data;
A decoding step of decoding the transmission data based on the extracted voice data;
Including
In the encoding step, the output voice data indicates a voice having a plurality of voiced sections and a silent section between adjacent voiced sections according to the transmission data, and the amplitude of each voiced section starts. Output the output audio data so that it shows a sine curve that increases from time to time and then decreases ,
A communication method characterized by the above.

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