TW201429179A - Information distribution system - Google Patents

Abstract

[Problem] To provide an information distribution system capable of selective distribution involving acoustic communication while preventing an increase in the volume of data. [Solution] An information distribution system (1) equipped with: an emitting device (10), equipped with an encoding unit (21) that adds a selective distribution key to calculation source data and calculates an error detection code, a modulation unit (25) that modulates a carrier wave by means of encoded data, and a speaker (17) that emits a modulated signal and a reception device (30), equipped with a microphone (36), a storage unit (32) that records the selective distribution key, a demodulation unit (41) that demodulates the signal received by the microphone (36), and a decoding unit (42), having a calculation error detection code generation unit (423), which adds the selective distribution key in the storage unit (32) to the calculation source data obtained from the demodulated signal and calculates a calculation error detection code, and a comparison unit (425), which compares the calculation error detection code and the received error detection code obtained directly from the demodulated signal, with various information being decoded only when the comparison result is a match.

Description

Information dissemination system

The present invention relates to an information dissemination system for utilizing acoustic telecommunication by sound waves to propagate various information from a transmitting device toward a receiving device.

Conventionally, for example, as disclosed in Patent Documents 1 and 2 below, there has been provided an information providing system that provides information by acoustic communication using sound waves. Since the sound generated by the acoustic communication is widely transmitted from a general speaker, the receiving device can be received without any restriction as long as it is within the range in which the sound can be received.

However, there is a demand that only a specific receiving device is transmitted among receiving devices within a range in which sound can be received, but selective propagation is not considered in Patent Documents 1 and 2 below.

On the other hand, in order to achieve selective propagation only towards a particular receiving device, a system is known which is constructed by first inserting a predetermined authorization key into the transmission material, but only with the same authorization key. The receiving device can receive the transmitted data.

[Previous Technical Literature] (Patent Literature)

Patent Document 1: Japanese Patent No. 3834579

Patent Document 2: Japanese Patent No. 4528365

However, in order to selectively propagate, inserting an authorization key in the transmission data will cause the transmission data to increase by the amount equivalent to the authorization key. In the audio communication, the error rate during communication is increased due to noises in the surroundings, and the transmission speed is also slow. Therefore, the data capacity is not required to increase.

In view of the above problems, an object of the present invention is to provide an information dissemination system capable of selectively transmitting in an acoustic communication while suppressing an increase in data capacity.

In order to solve the above problems, an information dissemination system according to the present invention includes: a transmitting device that converts encoded various information into sound waves and transmits the same; and a receiving device that receives the aforementioned sound waves to decode the aforementioned various information; The information transmission system is characterized in that the transmission device includes a coding unit that adds an error detection correction symbol for error detection correction, and the above-described various information is transmitted from the transmission device to the reception device by acoustic communication. Encoding the various pieces of information to generate a coded unit of the baseband signal for adding the selected propagation key to the calculated original data to calculate the error detection correction symbol; and a modulation unit adjusted by the baseband signal Transforming a carrier to generate a modulated signal; and a speaker for transmitting the modulated signal as a sound wave; the receiving device comprising: a microphone receiving the sound wave; and remembering a pre-recorded selection propagation key; a demodulation variable unit that demodulates the received signal of the microphone to generate a demodulation signal; and a decoding unit that decodes the demodulated signal into the decoding of the various information And a calculation unit for calculating an error detection correction symbol, wherein the selected propagation key recorded by the storage unit is added to the calculation original data obtained from the demodulation conversion signal to calculate an error detection correction symbol; and a comparison unit that compares the reception error detection correction symbol directly obtained from the demodulation-converted signal with the calculation error detection correction symbol; and the decoding unit includes the foregoing only when the comparison results made by the comparison unit match Various information is decoded.

Further, the transmission device according to the present invention is a transmission device that transmits various kinds of information to the receiving device by means of audio communication, and is characterized in that the coding unit is provided with an error detection correction symbol for error detection correction. Encoding the various pieces of information to generate a baseband signal encoding unit for adding a selected propagation key to the calculated original data to calculate the error detection correction symbol; and a modulation unit modulated by the base frequency signal a carrier to generate a modulated signal; and a speaker that transmits the aforementioned modulated signal as a sound wave.

Further, the receiving apparatus of the present invention is a receiving apparatus that receives various kinds of information transmitted by the transmitting apparatus, and the various types of information are encoded by adding an error detecting correction symbol to the transmitting apparatus, and are transmitted as sound waves. The detection correction symbol is obtained by adding a selection propagation key to the calculation of the original data, and the receiving device is characterized by comprising: a microphone that receives the sound wave; and a memory unit that records a selection propagation key in advance; and a demodulation variable unit The demodulation of the received signal of the aforementioned microphone becomes alive And a decoding unit that decodes the demodulated signal into the various types of information, and includes: an error detection correction symbol unit that adds the selected propagation key recorded by the memory unit Calculating the original data obtained from the demodulated variable signal to calculate an error detection correction symbol; and comparing the reception error detection correction symbol directly obtained from the demodulation signal and the calculation error detection symbol The comparison unit decodes the various pieces of information only when the comparison results made by the comparison unit match.

Further, the acoustic signal transmission program according to the present invention is an acoustic signal transmission program for causing a computer to encode various information and transmit it as a sound wave, and is characterized in that it includes an error detection correction symbol calculation step of adding a selection propagation key to Calculating the original data to calculate the error detection correction symbol; and encoding a step of encoding the various information to generate a baseband signal while adding the error detection correction symbol; and a modulation step by using the baseband signal The carrier is modulated to generate a modulated signal that is transmitted as a sound wave from the speaker.

Further, the acoustic signal receiving program according to the present invention is an acoustic signal receiving program for causing a computer to receive various kinds of information transmitted from the transmitting device, and the various kinds of information are encoded and added as sound waves by adding an error detecting correction symbol to the transmitting device. And being transmitted, the error detection correction symbol is calculated by adding a selection propagation key to the calculation original data, and the acoustic signal receiving program is characterized by: a demodulation changing step of solving the received signal of the microphone receiving the sound wave Modulating to generate a demodulation signal; and calculating an error detection correction symbol generating step of adding the selected propagation key recorded by the computer to the calculated original data obtained from the demodulated signal to calculate an error detection correction symbol Calculating; a comparison step of comparing a reception error detection correction symbol directly obtained from the demodulation signal to the calculation error detection correction symbol; and a decoding step only when the comparison result by the comparison unit is identical Decoding the aforementioned demodulated signal into various information.

According to the information dissemination system of the present invention, it is possible to selectively propagate in the acoustic communication while suppressing an increase in the data capacity.

1‧‧‧Information dissemination system

10‧‧‧Transfer device

11‧‧‧ arithmetic device

12‧‧‧ memory device

17‧‧‧ Speaker

21‧‧‧Decoding Department

22‧‧‧Carrier Generation Department

25‧‧‧Transformation Department

30‧‧‧ Receiving device

41‧‧‧Demodulation

42‧‧‧Decoding Department

121‧‧‧Program Storage

122‧‧‧Data Storage Department

123‧‧‧Authorized Key Storage Department

211‧‧‧Error detection symbol calculation unit

321‧‧‧Program Storage Department

323‧‧‧Authorization Key Storage Department

421‧‧‧Error Detection Department

31‧‧‧ arithmetic device

32‧‧‧Memory device (memory department)

36‧‧‧Microphone

423‧‧‧Computed error detection symbol generation unit

425‧‧‧Comparative Department

Fig. 1 is a schematic view showing the configuration of an information distribution system according to an embodiment of the present invention.

Fig. 2 is a schematic view showing the configuration of a transfer device according to an embodiment of the present invention.

Fig. 3 is a block diagram schematically showing the function of the transport device according to the embodiment of the present invention.

Fig. 4 is a view showing a frame structure of the encoded material according to the embodiment of the present invention.

Fig. 5 is a schematic view showing the configuration of a receiving apparatus according to an embodiment of the present invention.

Fig. 6 is a block diagram schematically showing the function of the receiving apparatus according to the embodiment of the present invention.

Figure 7 is a diagram showing the coding of a variation of the embodiment of the present invention. A diagram of the framework of the materialized structure.

Hereinafter, an information dissemination system according to an embodiment of the present invention will be described with reference to the drawings. The information transmission system according to the present embodiment is a system that transmits various information such as a URL from a receiving device that is installed in a store to a user who is staying in the store, and that uses air as a sound wave of the media. Further, the information dissemination system can selectively transmit various kinds of information to a specific one of a plurality of (two or more) receiving devices.

Fig. 1 is a schematic view showing the configuration of an information distribution system according to an embodiment of the present invention. As shown in the figure, the information transmission system 1 includes a transmission device 10 that transmits an acoustic signal that is a sound wave including various kinds of information as propagation information, and a receiving device 30 that receives an acoustic signal and acquires various kinds of information.

Fig. 2 is a schematic view showing the configuration of a transfer device according to an embodiment of the present invention. Fig. 3 is a block diagram schematically showing the function of the transport device according to the embodiment of the present invention.

The transfer device 10 is installed in a PC (personal computer) of a store for the user who is visiting the store to spread various information such as the URL of the store, the promotion information, and the coupon information. As shown in FIG. 2, the transmission device 10 includes a computing device 11 that performs various calculations of a CPU or the like, and a memory device 12 that functions as a hard disk drive that stores various kinds of information in advance and a work area that is arithmetic processing. A RAM or the like is constructed; and a speaker 17 for transmitting sound waves.

The memory device 12 includes a program storage unit 121 that records various programs for executing a predetermined process to be described later in the transfer device 10, and a data storage unit 122 that records in advance a URL to be transmitted to the user, promotion information, Various information such as coupon information; and an authorization key storage unit 123 that pre-records an authorization key for receiving only a specific receiving device 30.

The program storage unit 121 stores an audio signal transmission program for performing the transmission processing of the acoustic signal in the transmission device 10. Further, the authorization key is a selective propagation key for selectively transmitting the propagation information to the specific receiving device 30, and as will be described later, only the authorization used when calculating the error detection symbol in the transmitting device 10 is used. The receiving device 30 of the same authorized key of the key can obtain the broadcast information.

Further, as shown in FIG. 3, the transmission device 10 includes a coding unit 21, a carrier generation unit 22, and a modulation unit 25. The functions of the respective units are realized by the arithmetic unit 11 executing the acoustic signal transmission program in the program storage unit 121.

The coding unit 21 includes an error detection symbol calculation unit 211 that calculates an error detection symbol (redundant bit) for detecting an error at the time of communication. The encoding unit 21 generates a baseband signal by encoding an error detection symbol or the like to the propagation information to be transmitted to the user, and encoding the propagation information into a frame structure.

Fig. 4 is a view showing a frame structure of the encoded material according to the embodiment of the present invention. In the present embodiment, the data shown in Fig. 4 is collectively referred to as a frame structure. The framework consists of four data columns (data groups, data transfer units), and each column is called a packet.

In Fig. 4, the packets of the first column are sequentially arranged from the front, and are "Preamble" for synchronizing the timing, "SOF" (Start of Frame) for identifying the front of the frame, and the structure of the frame. The "type" of the form, the "Pkt count" indicating the total number of packets included in the frame, the "SC data size" indicating the data capacity of the encoded data (the baseband data), and the "CRC8" for error detection. .

The packets in the second to fourth columns are arranged in order from the front, and each is a "Packet No." indicating the packet number, and a data body (payload) for transmitting information, that is, "data n" to "data n+". 5" and "CRC8". Each "data n" is a piece of metadata, and each packet can store 6 bytes of data.

Here, the error detection symbol calculation unit 211 that calculates the CRC 8 usually calculates the error detection symbol based on the data included in each packet, that is, "calculates the original data". However, in the present embodiment, the authorization key is further selected. The propagation key is added to the "calculated original data" and the error detection symbol is calculated.

Specifically, the error detection symbol calculation unit 211 adds the predetermined authorization key recorded by the authorization key storage unit 123 to the "Preamble", "SOF", and "type" in the first column of the frame. The "calculated raw data" consisting of "Pkt count" and "SC data size" is calculated to calculate CRC8. In addition, in the second to fourth columns of the framework (Packet No. 1 to No. 3), a predetermined authorization key is added to the "packet No." and the data body "data". Information" to calculate CRC8.

In this way, a number is added in advance for each packet, thereby being able to receive On the side of the device 30, each packet is decoded, and even in an environment where the error rate is high, it is possible to realize accurate information propagation by decoding each packet from the acoustic signal transmitted repeatedly.

Further, in all the packets constituting the frame, an error detecting symbol (an error detecting symbol including an authorization key) calculated by adding an authorization key is inserted in advance, whereby the receiving device 30 can perform for each packet. The control of decoding can improve security.

For example, in a frame composed of a plurality of packets, when only one error detecting symbol including an authorization key is inserted, in the receiving device 30 not having the authorization key, the data of the entire frame can be decoded. The matter is limited, but the information of each packet may still be decoded. In contrast, by inserting an error detection symbol containing an authorization key in all packets in advance, the decoding of each packet can be limited.

In addition, the manager of the transmission device 10 arbitrarily selects the authorization key used for propagation in consideration of the propagation destination (propagation target), and manages the storage of a plurality of authorization keys in the authorization key storage unit 123, When the transfer device 10 is caused to perform transfer processing, it is possible to select an authorization key to be used.

Of course, the error detection symbol calculation unit 211 can calculate the CRC 8 only from the normal "calculated original data" without adding the authorization key, and whether the encoded data (the baseband signal) is added with the authorization key. The method calculates the information of CRC8 and records it in the "type" indicating the form of the frame.

The carrier generation unit 22 generates a carrier (carrier) to carry the encoded propagation signal and transmit it. The carrier frequency fc of the carrier can be set, for example, to 8,820 Hz, 11,760 Hz, and 14,700 Hz.

The modulation unit 25 modulates the carrier wave generated by the carrier generation unit 22 by the coding information encoded in the coding unit 21, that is, the fundamental frequency signal, to generate a modulation signal. The modulation rate (baud rate) in the modulation section 25 is, for example, 2,940 Hz. As the modulation method, for example, an SSB (single sideband) method, BPSK, QPSK, or the like is employed.

The modulation signal generated by the modulation unit 25 is transmitted from the speaker 17 as a sound wave (audio signal, sound code) of the sound pressure vibration to the air. At the time of transmission, the modulated wave (modulation signal) is recorded as a sound data file (wav file or the like) for a predetermined number of seconds, and then the sound data file is repeatedly reproduced by a predetermined number of times, thereby transmitting an acoustic signal.

Next, the configuration of the receiving device 30 will be described. Fig. 5 is a schematic view showing the configuration of a receiving apparatus according to an embodiment of the present invention. Fig. 6 is a block diagram schematically showing the function of the receiving apparatus according to the embodiment of the present invention.

The receiving device 30 is a portable terminal carried by a user who is visiting a store, for example, a smart phone, but can also carry a portable notebook computer, a PDA (personal digital assistant), a tablet computer, a small notebook ( A netbook, a game machine, and the like, and various computer terminals having a smart phone for receiving sound waves are used as the receiving device 30.

The receiving device 30 includes a computing device 31, a CPU that performs various calculations, and the like, and a memory device (memory unit) 32 that functions as a flash memory that stores various kinds of information in advance, or a RAM that functions as a work area for arithmetic processing. The microphone 36 is configured to receive the sound wave and convert it into an electrical signal.

The memory device 32 includes a program storage unit 321 that records in advance Various programs for executing a predetermined process to be described later in the transmitting device 30; and an authorization key storage unit 323 that records in advance a necessary authorization key (selection propagation key) for decoding the received propagation signal.

The program storage unit 321 stores an audio signal receiving program for performing reception processing of an acoustic signal in the receiving device 30. The audio signal receiving program can be obtained, for example, by downloading the operator-specific dedicated receiving program provided by the operator in advance, and the operator is the operator who transmits the various information by the transmitting device 10. Moreover, the audio signal receiving program can also be a general-purpose receiving program for receiving communication information of a plurality of operators.

The acquisition of the authorization key in the receiving device 30 must be performed in advance of the reception of the broadcast information. For example, in the case of a dedicated acoustic signal receiving program, the authorization key already loaded in the receiving program can be used. Further, in the case of a general-purpose audio signal receiving program, the download function of the authorization key can be equipped in advance in the receiving program, and the authorization key can be downloaded from the website of the appropriate broadcast operator in accordance with the need.

Further, as shown in FIG. 6, the receiving device 30 includes a demodulation converting unit 41 that demodulates a received signal received by the microphone 36 into a demodulated signal corresponding to a fundamental frequency signal, and a decoding unit 42. The demodulated variable signal is decoded to produce propagation information. The functions of the respective units are realized by the arithmetic unit 31 executing the acoustic signal receiving program in the program storage unit 321.

The decoding unit 42 includes an error detecting unit 421 that performs error detection by the CRC 8. As described above, when the error detecting symbol is calculated by the encoding unit 21 of the transmitting device 10, the authorization key is added to the normal "calculated original data" to calculate an error detecting symbol.

Therefore, in the receiving device 30, the "reception error detection symbol" obtained by demodulating the conventional reception signal and the "calculation of the original data" obtained by demodulating the reception signal are calculated. The error detection symbol is compared, and if the two values are inconsistent, the appropriate error detection cannot be performed.

In this way, the error detecting unit 421 includes a calculated error detecting symbol generating unit 423 that generates a “calculated error detecting symbol” that adds the authorization key of the authorized key storage unit 323 to the slave. The "calculated raw data" obtained by demodulating the variable signal is calculated, and the comparing unit 425 compares the "calculated error detecting symbol" with the "reception error detecting symbol" directly obtained from the demodulated converted signal.

Then, when the comparison result of the comparison unit 425 is matched, the error detecting unit 421 determines that the received data is correct. According to the error detecting unit 421 having such a configuration, only when the communication error does not occur and the authorization key on the transmitting side matches the authorization key on the receiving side, it is judged that the received data is correct, and the transmission is performed in the decoding unit 42. Decoding of information.

In other words, the error detecting unit 421 has an error detecting function for detecting occurrence of a communication error and an authorization key collation function (selection of a transmission key comparison function) for checking whether or not the transmission key of the transmitting side and the receiving side are identical.

Further, when the license key storage unit 323 stores a plurality of license keys, the error detecting unit 421 can generate "calculate error detection symbols" from all the authorization keys, and perform the "reception error detection symbols". For comparison, when it is consistent with any of the "calculated error detection symbols", it is judged that the received data is correct. Further, at the time of reception, the user can also select the authorization key on the acoustic signal receiving program.

Further, the error detecting unit 421 adds a coded data (base frequency) of the error detection symbol (CRC8) calculated only from the normal "calculated original data" to the error detection symbol to which the authorization key is not added. The signal can also be detected by error, that is, the "type" in the encoded data (baseband signal) can be used to identify whether or not the attached error detection symbol is included.

In the case where the error detection symbol calculated by the normal "calculation of the original data" is added to the coded data, the error detection code generation unit 423 is calculated to calculate the original data only from the demodulation signal. The calculation unit generates a "calculated error detection symbol", and the comparison unit 425 compares the "calculated error detection symbol" with the "reception error detection symbol" directly obtained from the demodulation-converted signal.

When the error detecting unit 421 determines that the received data is correct, the decoding unit 42 extracts the portion of the data body from the demodulated variable signal and outputs it as the propagation information. Thereby, the receiving device 30 can receive the broadcast information from the transmitting device 10 via the sound wave.

Further, in the receiving apparatus 30, by referring to the frame type "type" of the received demodulated signal, it is determined that the received data is only the data of the CRC8 calculated from the normal "calculated original data", and is decoded. In the error detecting unit 421 of the unit 42, as described above, the error detecting symbol obtained by demodulating the received signal is compared with the error detecting symbol calculated from the "calculated original data" obtained by demodulating the received signal. For error detection.

Although the present embodiment has been described in detail above, according to the present embodiment, when the error detection symbol added to the encoding is calculated, The selection of the transmission key (authorization key) is added to the "calculation of the original data" to calculate the error detection symbol, whereby only the receiving device having the same selection of the transmission key receives the propagation information, that is, the selective transmission can be performed.

Further, according to the present embodiment, the selective propagation key for performing selective propagation is reflected to the value of the error detection symbol, so that it is not necessary to include the selection propagation key in the transmission data of different routes (extra) for transmission. Therefore, it does not increase the transmission data capacity and transmission time, but can achieve selective propagation. In particular, in the case of acoustic communication, this embodiment is particularly useful because it is susceptible to noise and has a large data capacity and greatly increases the error rate.

Further, in the present embodiment, as the structure of the encoded material (baseband signal), a frame structure composed of a plurality of data columns (packets) can be employed, and the built-in authorization key error detecting symbol can be inserted into Since all the data columns of the frame are formed, each of the data columns can be limited in decoding by the receiving device 30, and the security can be further improved.

Although the embodiments of the present invention have been described above, the embodiments of the present invention are not limited to the above embodiments. Various changes can be made without departing from the spirit and scope of the invention. For example, in the above-described embodiment, a PC is used as the transmission device, but various electronic devices (computers) including a speaker for transmitting sound waves, such as a television, a radio, a smart phone, a game device, etc., can be used as the transmission device. .

Further, in the above-described embodiment, the error detection correction of the data is described as an example in which only the error detection is performed. However, the present invention is of course applied to both the error detection and the error correction. In the present specification, when the so-called error detection correction is performed, only the error detection is performed. Occasionally, and when both error detection and error correction are performed.

Further, in the above-described embodiment, the CRC 8 is taken as an example of the error detection correction symbol added to the coding, but various error detection correction symbols such as the CRC 32, the checksum, the BCH code, and the hash function (MD5) can be used.

Further, in the above-described embodiment, the data structure of the encoded material is a frame structure composed of a plurality of data columns. However, a frame structure composed of a single data string as shown in Fig. 7 may be employed.

The frame structure of this variation is constructed by a single data column. In the first place, there is a "Preamble" for synchronizing the timing. "Start of Frame" at the head of the frame, the shape of the frame structure "type", which means "data1" to "data3" of the data body for disseminating information, And "CRC8" for error detection.

17‧‧‧ Speaker

21‧‧‧Decoding Department

22‧‧‧Carrier Generation Department

25‧‧‧Transformation Department

122‧‧‧Data Storage Department

123‧‧‧Authorized Key Storage Department

211‧‧‧Error detection symbol calculation unit

Claims (8)

An information dissemination system comprising: a transmitting device that converts encoded various information into sound waves and transmits the same; and a receiving device that receives the sound waves to decode the aforementioned various information; and transmits the foregoing information by acoustic communication The device transmits the various kinds of information to the receiving device. The information transmission system includes a coding unit that encodes the various types of information while adding an error detection correction symbol for error detection correction. Generating a baseband signal encoding unit for adding a selected propagation key to the calculated original data to calculate the error detection correction symbol; and a modulation unit that modulates the carrier by the baseband signal to generate a modulated signal; And a speaker that transmits the modulated signal as a sound wave; the receiving device includes: a microphone that receives the sound wave; a memory unit that records a selected propagation key in advance; and a demodulation unit that receives the microphone Signal demodulation is performed to generate a demodulation signal; and a decoding unit is demodulated from the foregoing a decoding unit that decodes the signal into the various types of information, and includes: an error detection correction symbol generating unit that adds the selected propagation key recorded by the storage unit to the calculated original data obtained from the demodulated signal to Calculating an error detection correction symbol; and a comparison unit that receives the reception error detection correction symbol directly obtained from the modulation signal The error detection correction symbol is compared with the calculation result, and the decoding unit decodes the various types of information only when the comparison results by the comparison unit match. The information dissemination system according to claim 1, wherein in the transmitting device, the encoding unit encodes data of a frame structure composed of a plurality of data columns, and the error detecting correction symbol is attached. To each data column. The information dissemination system according to claim 2, wherein the decoding unit decodes each of the data columns, and performs the foregoing various information in a comparison of the comparisons performed by the comparison units in all of the data columns. Decoding. The information transmission system according to any one of claims 1 to 3, wherein the encoding unit is configured to calculate the error detection correction symbol only from the calculation of the original data without adding the selection propagation key. The baseband signal includes information indicating whether or not the selection propagation key is added to calculate the error detection correction symbol. A transmission device is a transmission device that transmits various kinds of information to a receiving device by audio communication, and is characterized in that it includes a coding unit that encodes the various information while adding an error detection correction symbol for error detection correction. a coding unit for generating a baseband signal for adding a selection propagation key to the calculation original data to calculate the error detection correction symbol; and a modulation unit for modulating a carrier by the baseband signal to generate a modulation a signal; and a speaker that transmits the aforementioned modulated signal as a sound wave. A receiving device is a receiving device that receives various kinds of information transmitted by a transmitting device, and the various information is encoded in the transmitting device while being added with an error detecting correction symbol, and is transmitted as a sound wave, and the error detecting correcting symbol is Calculating the propagation key to calculate the original data, the receiving device is characterized by: a microphone that receives the sound wave; a memory unit that records a selection propagation key in advance; and a demodulation unit that receives the received signal of the microphone Demodulation is performed to generate a demodulated signal; and the decoding unit is a decoding unit that decodes the demodulated signal into the various types of information, and includes: a calculated error detection correction symbol generating unit that records the error recorded by the memory unit The selection propagation key is added to the calculation original data obtained from the demodulation conversion signal to calculate an error detection correction symbol; and the comparison unit receives the reception error detection correction symbol directly obtained from the modulation signal. Calculating the error detection symbols for comparison; and the decoding unit is only in the comparison unit The comparison results are consistent occasions, the aforementioned variety of information is decoded. An acoustic signal transmission program is an acoustic signal transmission program for causing a computer to encode various information and transmit it as a sound wave, and is characterized in that it includes an error detection correction symbol calculation step of adding a selection propagation key to the calculation of the original data to calculate The error detecting correction symbol; the encoding step of encoding the various information to generate a baseband signal while adding the error detecting correction symbol; and a modulating step of modulating the carrier by the baseband signal Generated A modulated signal that is transmitted as a sound wave from a speaker. An audio signal receiving program is an audio signal receiving program for causing a computer to receive various information transmitted by a transmitting device, and the various information is encoded in the transmitting device while being added with an error detecting correction symbol, and transmitted as a sound wave. The error detection correction symbol is obtained by adding a selection propagation key to the calculation of the original data, and the acoustic signal receiving program is characterized by comprising: a demodulation changing step of demodulating the reception signal of the microphone receiving the sound wave to generate Demodulating the variable signal; calculating an error detection correction symbol generating step of adding the selected propagation key recorded by the computer to the calculated original data obtained from the demodulated variable signal to calculate the error detection correction symbol; and comparing the steps And comparing the reception error detection correction symbol directly obtained from the modulation signal to the calculation error detection correction symbol; and the decoding step, wherein the demodulation signal is changed from the foregoing only when the comparison result of the comparison step is identical Perform the decoding of the aforementioned various information.