JP6577429B2 - Communication terminal, communication method and communication program using communication terminal - Google Patents

Description

  The present invention relates to a communication terminal that transmits a received sound wave, and a communication method and program using the communication terminal. More specifically, the communication terminal that receives the sound wave has received it with a probability corresponding to a correlation value calculated at the time of sound wave reception. The present invention relates to a communication terminal having a function of transmitting sound waves, a communication method using the communication terminal, and a communication program stored in the communication terminal in order to construct the communication method.

Conventionally, there are various communication techniques for communicating using sound as a transmission medium. For example, the inventor of the present application reproduces a sound including information such as ID from a speaker such as a television, signage, or in-house broadcasting, and receives the sound with a microphone of a terminal such as a smartphone. The system which displays a page, coupon information, etc. on a terminal was proposed (patent document 1).
Since such a sound communication technology is realized by using a speaker or a microphone, a dedicated antenna or communication device is not required unlike communication using radio waves. Pre-installed speakers and microphones such as TV speakers, smartphones and microphones can be used and are easy to introduce, so further spread is expected in the future.

  The range in which sound can be received is determined by the volume and the directivity of the speaker. In addition, unlike radio waves, sound is blocked by a wall or the like, so that it can be used for applications that can be received only at specific locations. Since many speakers have directivity, when using existing speakers, the reception range may be limited due to the directivity of the speakers.

  For example, in a ball game facility such as a covered baseball stadium shown in FIG. 4, when sound waves (voice information) are transmitted to the audience side using a plurality (four) of speakers 10 installed in the center of the ceiling, the orientation of the speakers 10 Due to the characteristics, good reception may not be possible at a part of the passenger seat (for example, a place other than the directivity range Y of each speaker 10 in FIG. 4). Even within the directivity range of the speaker, reception may not be possible due to noise or the like.

  On the other hand, in an environment where a plurality of wireless communication terminals are installed, a communication terminal that has received data transmits the received data to surrounding communication terminals, thereby transmitting the received data to a communication terminal that has not received the data in a multi-hop manner. There is technology to do. When all of the communication terminals that have received data transmit, the transmitted data collide with each other. Therefore, a communication method including means for determining whether to transmit data has been proposed.

  For example, in Patent Document 2, in order to avoid collision between data transmitted from a plurality of communication terminals, the communication terminal determines whether or not to transmit data with a predetermined transmission probability at the time of data reception. This transmission probability is determined according to the number of transmission waiting packets of the communication terminal. A communication terminal having a smaller number of transmission waiting packets (not in a load state) has a larger transmission probability, and a communication terminal having a larger number of transmission waiting packets (in a load state) has a smaller transmission probability. Thereby, it is possible to suppress excessive data transmission by the communication terminal in a loaded state.

  Further, in Non-Patent Document 1, it is determined whether to transmit data using the topology information of the communication terminal. Specifically, a communication terminal that has received data includes a set N (r) of its own peripheral communication terminals (communication terminals capable of direct communication), and a set N (s) of peripheral terminals of the communication terminal that has transmitted data. Compare If the set N (r) is a subset of the set N (s), no data is transmitted, otherwise data is transmitted. Thereby, unnecessary data transmission can be suppressed. Each communication terminal exchanges Hello messages with each other in order to grasp the surrounding communication terminals and obtain topology information.

Japanese Patent Application No. 2015-044673 JP 2011-030210 A

W. Peng and X. Lu.On the reduction of broadcast redundancy inmobile ad hoc networks.In Proceedings of MOBIHOC, 2000.

However, the communication method described above does not correspond to a communication terminal that cannot receive sound waves due to the directivity of a speaker or the like.
That is, Patent Document 2 assumes that each communication terminal generates data and transmits it in multihop. Each communication terminal needs to transmit the data generated by itself and the data received from surrounding communication terminals, so that a transmission waiting packet is generated, and the transmission probability is determined according to the number of transmission waiting packets. Is called.

  On the other hand, when it is assumed that information is distributed from a television, a signage, or a stadium speaker using sonic communication, each communication terminal does not generate data, so no transmission waiting packet is generated. Therefore, the technique of Patent Document 1 that determines the transmission probability according to the number of packets waiting for transmission cannot be applied to the above-described sonic communication.

Non-Patent Document 1 exchanges Hello messages to obtain information on peripheral communication terminals. When using sonic communication, it is necessary to activate a microphone in order to receive a Hello message.
With current smartphones such as iOS, it is difficult to activate the microphone at the time determined by the application or to always activate the microphone, and it is difficult to apply the technology of Non-Patent Document 1 to sonic communication. It was.

  As described above, it is difficult to apply the prior art to information distribution using sound wave communication, and there is a region where sound waves cannot be satisfactorily received due to the directivity of the speakers installed in the ball game field. However, there remains a problem that the communication terminal located in the area cannot receive sound waves from the speaker satisfactorily.

  The present invention has been proposed in view of the above circumstances, and when a plurality of communication terminals receive sound waves transmitted from a speaker installed in a ball game field or the like, the sound waves are favorably received due to the directivity of the speakers or the like. A communication terminal capable of transmitting sound waves received by a communication terminal located in an area where sound waves can be received to a communication terminal located in an incapable area, a communication method using the communication terminal, and a communication program stored in the communication terminal The purpose is to provide.

In order to achieve the above object, a communication terminal according to claim 1 of the present invention provides:
A sound wave receiver for receiving sound waves to be transmitted and acquiring sound data;
A demodulator that demodulates an ID included in the sound wave and calculates a correlation value between the voice data and pre-registered waveform data;
An operation unit for performing a predetermined operation according to the ID;
A transmission determination unit that calculates a sound wave transmission probability according to the correlation value and determines whether or not to transmit a sound wave according to the sound wave transmission probability;
An audio generation unit that generates transmission audio data including the ID when transmission of sound waves is determined by the transmission determination unit;
An audio transmission unit for transmitting the transmission audio data as a sound wave;
It is characterized by having.

  According to a second aspect of the present invention, in the communication terminal of the first aspect, the sound wave includes TTL (Time To Live) information that determines the number of times of sound wave relay.

  According to a third aspect of the present invention, in the communication terminal according to the second aspect, the transmission determination unit outputs a sound wave when an initial value is given as a predetermined value and a TTL that decreases each time the communication terminal relays the sound wave is greater than “0”. It is characterized by transmitting.

  According to a fourth aspect of the present invention, in the communication terminal according to the first aspect, the transmission determination unit sets the sound wave transmission probability to be smaller as the correlation value is larger and the sound wave transmission probability to be larger as the correlation value is smaller. Yes.

  According to a fifth aspect of the present invention, in the communication terminal according to the second aspect, the transmission determination unit updates the sound wave transmission probability according to the value of the TTL when the TTL is larger than “0”.

  According to a sixth aspect of the present invention, in the communication terminal according to the fifth aspect, the transmission determination unit sets the sound wave transmission probability to be larger as the TTL is larger and the sound wave transmission probability to be smaller as the TTL is smaller.

  According to a seventh aspect of the present invention, in the communication terminal according to the first aspect, a display unit is provided, and a predetermined operation by the operation unit is displayed on the display unit.

  According to an eighth aspect of the present invention, in the communication terminal according to the first aspect, the predetermined operation by the operation unit is to start a predetermined application.

A communication method using the communication terminal according to claim 9 includes: one or more speakers installed to transmit sound waves in a certain range; one or more communication terminals that can transmit sound waves received from the speakers; In a communication method of a communication system comprising:
The sound wave transmitted from the speaker includes ID information,
When the communication terminal receives the sound wave,
Demodulate the ID included in the sound wave, start a predetermined application according to the ID,
A sound wave transmission probability is calculated by calculating a correlation value between sound data included in the sound wave and waveform data registered in advance, and the received sound wave is transmitted according to the sound wave transmission probability.

  According to the communication method using the communication terminal of claim 1 and the communication terminal of claim 9, the communication terminal that has received the sound wave transmits the received sound wave to the surrounding communication terminals according to the correlation value calculated at the time of sound wave reception. Can transmit sound waves to communication terminals located in areas where sound waves cannot be received due to the directivity of speakers, etc., while reducing the number of communication terminals that simultaneously transmit sound waves and colliding. it can.

  According to the communication terminal of claim 2, by including TTL (Time To Live) information in the sound wave, it is possible to grasp the number of relays to the communication terminal when demodulating the sound wave.

  According to the communication terminal of claim 3, the transmission determination unit performs control to transmit the received sound wave when the TTL is larger than “0”, and not to transmit the sound wave when the TTL is “0”. Can do.

  According to the communication terminal of claim 4, in the transmission determination unit, the sound wave transmission probability can be changed depending on the magnitude of the correlation value, and the communication terminal is located at the end of the region where the sound wave can be received better as the correlation value is smaller. Recognizing that it is located, the sound wave transmission probability can be set large.

  According to the communication terminal of claim 5, by updating the sound wave transmission probability according to the value of TTL, the sound wave transmission probability can be changed according to the number of relays.

  According to the communication terminal of claim 6, in the transmission determination unit, the sound wave transmission probability can be changed depending on the magnitude of the TTL, and the communication terminal is located at a position in a region away from the central region where the reception is better as the TTL is larger. Recognizing that it is located, the sound wave transmission probability can be set large.

  According to the communication terminal of the seventh aspect, the operation state can be confirmed by displaying the predetermined operation by the operation unit on the display unit.

  According to the communication terminal of claim 8, it is possible to activate the predetermined application by demodulating the ID at the time of sound wave reception by setting the activation of the predetermined application as a predetermined operation. Images and the like can be displayed on the screen.

  According to the communication program of the tenth aspect, the communication method according to the ninth aspect can be established in the communication terminal by storing it in the communication terminal.

It is a block diagram for demonstrating the communication system using the communication terminal of embodiment of this invention. It is a flowchart figure which shows the sequence of the transmission instruction | indication in the visit determination part of a communication terminal. It is a model figure in the case of transmitting with the sound wave transmission probability according to the correlation value when the communication terminal receives the sound wave. It is a model figure in the case of transmitting a sound wave (audio | voice information) using the speaker installed in the baseball field.

Next, a communication system as an example of an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the communication system includes a speaker (playing device) 10 installed in a ball game field and the like, and a smartphone (communication terminal) 20 owned by a large number of users who gathered as event spectators in the ball game field or the like. Composed. As the speaker 10, a speaker installed in a stadium, an event venue, a building, or the like may be used, or a dedicated speaker device may be used.

  The communication terminal 20 may be a tablet terminal, a PC, or a dedicated terminal in addition to a smartphone. The communication terminal 20 includes a ROM that stores a basic program including an operating system (OS) and various basic devices, a hard disk drive (HDD) that stores various programs and data, a CPU that executes the program, The system includes a RAM that provides a work area for the CPU, a display unit that includes a touch panel that also serves as an operation unit, and an interface that communicates with an external device. Is stored in the HDD.

The speaker (reproducer) 10 reproduces (transmits) a sound wave including information such as an ID, and receives the sound wave reproduced by the speaker 10 by a microphone included in the smartphone (communication terminal).
In the communication terminal 20 that has received the sound wave, a predetermined operation such as connecting to the Internet and displaying a web page or starting an application registered in advance in the communication terminal 20 is performed according to the ID information included in the sound wave. Done.

The speaker (reproducer) 10 includes a sound wave transmission unit 11 and transmits sound waves including an ID. The ID is composed of uniquely identifiable information such as a unique numerical value. The sound wave including the ID may be transmitted alone or may be transmitted after being mixed with other sound.
When information such as an ID is transmitted by a sound wave, an error may occur in the information due to the influence of environmental noise or the like. In order to reduce such errors, an error correction code, which is an existing technology, may be added, or interleaving may be performed.

When the sound wave transmission unit 11 transmits a sound wave including an ID, the communication terminal 20 that has received the sound wave can perform an operation according to the ID. As described above, the operation according to the ID by the communication terminal 20 includes connecting to the Internet and displaying a web page, starting an application registered in advance in the communication terminal 20, and the like. When displaying, it is possible to access different web pages according to the ID.
Therefore, the ID superimposed on the sound wave is changed according to the web page to be displayed on the communication terminal 20. For example, when a shopping program on a television is assumed, a different ID is superimposed for each introduced product. Thereby, it becomes possible to guide to the introduction page for each product. Regardless of the broadcast content, the ID to be superimposed may be changed based on other criteria such as broadcast time.

The sound wave transmitted by the sound wave transmitting unit 11 may use a non-audible sound or an audible sound. If you do not want to affect broadcast sound such as TV program sound, non-audible sound may be used. Conversely, if it is desired to explicitly indicate that a sound wave is being transmitted, an audible sound may be used.
Further, the frequency of the sound wave may be set in consideration of the frequency that can be reproduced by the speaker (reproducing device) 10. For example, a sound wave having a frequency of less than 6 kHz is used because a data having a frequency of 6 kHz or higher cannot generally be reproduced in television data broadcasting.

The sound wave includes TTL (TimeToLive) in addition to the ID information. As will be described later, the TTL is used when the communication terminal 20 that has received the sound wave determines whether or not to transmit the sound wave to the surrounding communication terminals 20. The TTL is given an initial value with a predetermined value T (a positive integer greater than or equal to “0”), and is a value that subtracts “1” every time a sound wave is transmitted and relayed.
Note that the TTL value T may be held by the communication terminal 20 or may be included in the sound wave and communicated to the communication terminal 20.

  The communication terminal 20 includes a sound wave receiving unit 21 that receives sound waves from the speaker 10, a demodulation unit 22 that demodulates the received sound waves, an operation unit 23 that performs an operation according to ID, and surrounding communication terminals 20. A transmission determination unit 24 that determines whether or not to transmit a sound wave, a sound generation unit 25 that generates transmission sound data to be transmitted to surrounding communication terminals 20, and a sound transmission unit 26 that transmits the generated transmission sound data And a display unit 27 for displaying information.

  The sound wave receiving unit 21 records voice from the speaker 10 using a voice input device such as a microphone already installed in the communication terminal 20, and generates received voice data. The received audio data is output to the demodulator 22.

The demodulator 22 detects sound waves from the audio data received from the sound wave receiver 21. At this time, the detection of the sound wave may be facilitated by extracting only the frequency of the sound wave from the sound data by using a frequency filter. In this case, the frequency of the sound wave is stored in the communication terminal 20 in advance.
The communication terminal 20 stores waveform data of sound waves transmitted from the speaker 10 in advance. A correlation value (0 to 1) between the waveform data and the audio data is calculated. The correlation value is a numerical value of the degree of approximation between the stored waveform data and audio data. The larger the numerical value, the closer the both are. If the correlation value is equal to or greater than a predetermined threshold (eg, 0.3), it is determined that a sound wave has been detected. If the correlation value is lower than the predetermined threshold (eg, 0.3), sound wave data suitable for re-transmission is obtained. Judge that it is not obtained.
The calculated correlation value is output to the transmission determination unit 24.

Further, the demodulator 22 demodulates the detected sound wave and acquires ID and TTL. When an error correction code is added or interleaved, reverse processing is performed to obtain ID and TTL. The acquired ID is output to the operation unit 23 and the voice generation unit 25, and the ID and TTL are output to the transmission determination unit 24.
Also, when the demodulator 22 obtains the same ID as the previously detected ID from the detected sound wave (second reception of the same sound wave), the sound wave data is discarded without performing subsequent processing. Also good.

The operation unit 23 causes the communication terminal 20 to perform an operation according to the ID acquired by the demodulation unit 22. Examples of the operation include information display on the display unit 27 such as a liquid crystal screen or a touch panel provided in the communication terminal 20 or activation of a specific application. When information is displayed on the display unit 27, the information to be displayed may be stored in the communication terminal 20 or acquired from a server. When acquiring from a server, the communication function with which the communication terminal 20 is provided is utilized, and ID input from the demodulation part 22 is transmitted to a server.
As a communication function, when a smartphone or a tablet is assumed as the communication terminal 20, access via the Internet by cellular communication such as LTE or wireless communication such as Wi-Fi can be considered. Further, not limited to wireless communication, wired communication may be used.
The connection destination server may be fixed or may be changed according to time or the like. Information necessary for connection, such as an IP address, may be stored in the communication terminal 20 in advance, or may be distributed and changed via a communication function.

When the information displayed by the communication terminal 20 is acquired from the server, the URL is acquired from the server after transmitting the ID to the server. Then, the URL acquired from the server is accessed. Content such as a web page is received from the accessed destination.
The received content is displayed on a display unit 27 such as a liquid crystal screen or a touch panel provided in the communication terminal 20.
As the content, a web page, an image, a moving image, or the like can be considered. In addition, assuming a smartphone or a PC as the communication terminal 20, it is assumed that it has a function equivalent to a web browser, such as browsing a link or purchasing a product from a displayed web page by operating a touch panel, a mouse, a keyboard or the like. An operation may be performed.

The transmission determination unit 24 determines whether or not to transmit a sound wave to the surrounding communication terminals 20 using the correlation value and TTL received from the demodulation unit 22. The procedure of determination processing by the transmission determination unit 24 will be described with reference to the flowchart of FIG.
First, when determining whether or not to transmit a sound wave, it is determined whether the TTL input from the demodulator 22 is not “0” (step 101).
If TTL is “0”, the process ends without transmitting (step 200).

If TTL is greater than “0”, the sound wave transmission probability X is calculated using the correlation value received from the demodulator 22 (step 102). Specifically, the calculation is performed by the following equation so that the sound wave transmission probability is smaller as the correlation value is larger and the sound wave transmission probability is larger as the correlation value is smaller.
X = 1- (phase Sekichi)

  The correlation value becomes higher as the reception environment is better, for example, the volume of the sound reproduced from the speaker is large or the noise is low. Further, as shown in communication terminals 20 of A, B, and C in FIG. 3, due to the directivity of the speaker 10, the front side of the speaker 10 has a high correlation value (the communication terminal B has a correlation value of 0.95), and the front side. It is known that the correlation value decreases as the value deviates from (the communication terminal A has a correlation value of 0.4 and the communication terminal C has a correlation value of 0.35).

As a result, a communication terminal with a poor reception environment (low correlation value) transmits sound waves with a high sound wave transmission probability (1-correlation value).
In the case of this example, the communication terminal having the lowest correlation value (correlation value 0.3) among the communication terminals performing retransmission has the sound wave retransmitted with a sound wave transmission probability of 70% (1-correlation value). become.
Therefore, in FIG. 3, in a region where the reception environment in front of the speaker is relatively good, a plurality of communication terminals easily receive sound waves. Therefore, by setting the sound wave transmission probability as described above, collisions due to unnecessary transmission are reduced. Yes (communication terminal B).
On the contrary, in the communication terminal A and the communication terminal C that are located away from the front of the speaker, the communication terminal 20 (communication terminal D and communication terminal E outside the directivity range of the speaker is set by setting the sound wave transmission probability high. ) Make it easier to transmit sound waves to.

Next, it is determined whether or not TTL is an initial value (step 103).
In step 103, if the TTL is other than the initial value T (meaning reception from a communication terminal), the sound wave transmission probability X is updated.
That is, when the communication terminal 20 receives the retransmitted sound wave, the sound wave transmission probability X is updated. For example, if the same sound wave is transmitted many times (TTL decreases), transmission is performed with a lower sound wave transmission probability X (the larger the TTL, the larger the sound wave transmission probability becomes. The smaller the is, the smaller the sound wave transmission probability can be set). Therefore, it is possible to reduce the repeated transmission of the same sound wave.

X = X × α
α = TTL / 10 (where α = 1 when α is 1 or more)

If it is determined in step 103 that TTL is the initial value T (meaning reception from the speaker 10), the process proceeds to step 105.
In step 105, a random number for determining whether or not to transmit a sound wave is generated based on the sound wave transmission probability X calculated in step 102 or the sound wave transmission probability X updated in step 104.

Subsequently, it is determined whether or not to transmit a sound wave according to the sound wave transmission probability X calculated in step 102 or the sound wave transmission probability X updated in step 104 (step 106).
That is, it is determined whether or not to transmit a sound wave with reference to the random number created in step 105 based on the sound wave transmission probability X.

When transmitting a sound wave with the sound wave transmission probability X, the TTL is decremented by “1” (step 107) and the updated TTL is output to the sound generation unit 25 so that the communication terminal receives and relays the sound wave. An instruction to transmit sound waves is given (step 108).

  In step 106, when the sound wave is not transmitted with the sound wave transmission probability (1-X), the operation of the transmission determining unit 24 is ended (step 200).

Returning to the block diagram of FIG. 1, the voice generation unit 25 generates transmission voice data in which the ID input from the demodulation unit 22 and the TTL input from the transmission determination unit 24 are superimposed. ID and TTL are used as bit string data and modulated with sound waves. Examples of modulation methods include frequency modulation and phase modulation.
The transmission audio data to be generated has the same format as that of the speaker (playback device) 10. Error correction codes and interleaving may be applied. Further, a signal (header or footer) that can identify the beginning or end of the sound wave may be added.
The generated transmission voice data is output to the voice transmission unit 26.

  The audio transmission unit 26 converts the transmission audio data input from the audio generation unit 25 into an analog signal and reproduces it from an audio output device such as a speaker. The reproduced audio is received by another communication terminal 20 in the same manner as the audio reproduced from the speaker (reproducer) 10.

Then, about the specific example which reproduces | regenerates the audio | voice containing ID from the speaker 10 for guidance installed in the baseball field etc., receives with the smart phone (communication terminal 20) which a user has, and displays coupon information on the communication terminal 20, This will be described with reference to FIG.
First, a sound including ID and TTL is created as a sound wave transmitted from the speaker 10. Here, ID = 0001 and TTL = 1 are set, and a sound file such as wav is created so that it can be easily reproduced from the sound device of the baseball field. It is assumed that the sound person in charge of the baseball stadium can save the created wav file in the sound equipment of the stadium and reproduce the sound at an arbitrary timing by pressing a button.
In this example, it is initialized with TTL = 1 for simplicity. That is, the sound wave transmitted from the speaker 10 is transmitted only once at the maximum by the communication terminal 20 that has received it.

  A non-audible frequency band is used for sound waves so as not to interfere with baseball speech announcements. For example, modulation is performed using sound in a frequency band of 17 to 20 kHz. Thereby, since the sound wave is hard to be heard by the human ear, the sound wave can be reproduced simultaneously with the baseball voice announcement.

The person in charge of sound reproduces the sound wave from the speaker in the stadium by pressing a button of the sound device at a timing designated in advance, registering the time for reproduction in advance and automatically reproducing it.
For example, a sound wave is reproduced from the speaker 10 at the same time as a beer advertisement is displayed on an electric bulletin board in a stadium.
A spectator who is watching a baseball game installs an application to receive sound waves in his / her smartphone (communication terminal 20) and starts it up. When the application is activated, the microphone of the communication terminal 20 is activated and acquisition of audio data is started.
The correlation value between the acquired voice data and the waveform data of the sound wave saved in the application is calculated. While the sound wave is not reproduced, the correlation value is a small value of about 0 to 0.2. When sound waves are reproduced from the speaker 10 in the stadium, the correlation value increases.

A high correlation value of 0.95 is obtained for the communication terminal B located within the directivity range Y in front of the speaker. Since the correlation value exceeds the threshold (here, 0.3), ID = 0001 and TTL = 1 are acquired from the received audio data. Then, information corresponding to ID = 0001 (here, beer coupon information) is displayed on the screen (display unit 27) of communication terminal 20.
Since TTL = 1> 0, the sound wave transmission probability is obtained in order to determine whether the received sound wave is transmitted to the surrounding communication terminals. The sound wave transmission probability is relatively low 5% (0.05 = 1−0.95). Whether or not to transmit using a random number is determined according to the sound wave transmission probability of 5%. Here, it is determined that transmission is not performed.

Thus, the communication terminal 20 (communication terminal B), which is located in front of the speaker 10 and has a relatively good sound wave reception environment, transmits sound waves with a low sound wave transmission probability, so that a plurality of communication terminals simultaneously transmit sound waves. Reduce transmission and collisions.
On the other hand, since the communication terminal A is located at the end of the directivity range Y of the speaker 10, it is assumed that a relatively low correlation value 0.4 is obtained. The correlation probability is calculated to be relatively high 60% (0.6 = 1−0.4). Here, it is assumed that the communication terminal A is determined to transmit sound waves. Then, the communication terminal A decrements “1” from the received TTL = 1 and sets TTL = 0. A sound wave including the received ID = 0001 and TTL = 0 is generated and reproduced from the speaker of the communication terminal 20 (communication terminal D).

  Here, the communication terminal D is located outside the directivity range of the speaker. When the communication terminal 20 of the present invention is not used, coupon information cannot be obtained because sound waves cannot be received. By using the communication terminal 20 of the present invention, the communication terminal D can receive the sound wave transmitted by the communication terminal A, and coupon information can be obtained.

According to the communication method using the communication terminal described above, the threshold value of the correlation value when the communication terminal 20 that has received the sound wave from the speaker 10 retransmits the sound wave is 0.3, and the sound wave transmission probability X associated with the correlation value. The sound wave is transmitted based on (1-correlation value), but the threshold value of the correlation value when the communication terminal 20 retransmits the sound wave may be set to a value exceeding 0.3. In addition, the sound wave transmission probability X may be set to a value different from (1-correlation value).
For example, the threshold value of the correlation value when the communication terminal 20 that receives the sound wave from the speaker retransmits the sound wave is set to 0.5, and when the correlation value exceeds 0.5, the sound wave is not retransmitted (the sound wave transmission probability). 0%), the sound wave may be retransmitted only when the correlation value is 0.5 (sound wave transmission probability 100%).

  By using the communication terminal 20 having the above-described configuration, the communication terminal 20 that has received the sound wave transmits the received sound wave to another communication terminal 20 in the vicinity according to the correlation value calculated at the time of sound wave reception. The sound waves can be transmitted to the communication terminals 20 that cannot directly receive sound waves due to the directivity of the speaker 10 or the like, while reducing the collision of a large number of communication terminals 20 transmitting sound waves at the same time.

  DESCRIPTION OF SYMBOLS 10 ... Speaker (reproduction machine) 11 ... Sound wave transmission part 20 ... Communication terminal 21 ... Sound wave reception part 22 ... Demodulation part 23 ... Operation | movement part 24 ... Transmission determination part 25 ... Sound generation part 26 ... Voice Transmitting unit, 27... Display unit.

Claims (10)

A sound wave receiver for receiving sound waves to be transmitted and acquiring sound data;
A demodulator that demodulates an ID included in the sound wave and calculates a correlation value between the voice data and pre-registered waveform data;
An operation unit for performing a predetermined operation according to the ID;
A transmission determination unit that calculates a sound wave transmission probability according to the correlation value and determines whether or not to transmit a sound wave according to the sound wave transmission probability;
An audio generation unit that generates transmission audio data including the ID when transmission of sound waves is determined by the transmission determination unit;
An audio transmission unit for transmitting the transmission audio data as a sound wave;
A communication terminal comprising:   The communication terminal according to claim 1, wherein the sound wave includes TTL (Time To Live) information that determines the number of times the sound wave is relayed.   The communication terminal according to claim 2, wherein the transmission determination unit transmits the sound wave when an initial value is given as a predetermined value and a TTL that decreases every time the communication terminal relays the sound wave is greater than “0”.   The communication terminal according to claim 1, wherein the transmission determination unit sets the sound wave transmission probability to be smaller as the correlation value is larger, and the sound wave transmission probability is set to be larger as the correlation value is smaller.   The communication terminal according to claim 2, wherein the transmission determination unit updates the sound wave transmission probability according to a value of the TTL when the TTL is larger than “0”.   The communication terminal according to claim 5, wherein the transmission determination unit sets the sound wave transmission probability to be larger as the TTL is larger and the sound wave transmission probability to be smaller as the TTL is smaller.   The communication terminal according to claim 1, further comprising a display unit, wherein a predetermined operation by the operation unit is displayed on the display unit.   The communication terminal according to claim 1, wherein the predetermined operation by the operation unit is to start a predetermined application. In a communication method in a communication system comprising one or more speakers installed to transmit sound waves in a certain range and one or more communication terminals capable of transmitting sound waves received from the speakers,
The sound wave transmitted from the speaker includes ID information,
When the communication terminal receives the sound wave,
Demodulate the ID included in the sound wave, start a predetermined application according to the ID,
A communication terminal that calculates a sound wave transmission probability by calculating a correlation value between sound data included in the sound wave and waveform data registered in advance, and transmits a received sound wave according to the sound wave transmission probability Communication method using In a communication system comprising one or more speakers installed to transmit sound waves in a certain range and one or more communication terminals capable of transmitting sound waves received from the speakers,
A communication program stored in the communication terminal,
When a sound wave that is transmitted from the speaker and includes ID information is received,
Demodulate the ID included in the sound wave, start a predetermined application according to the ID,
A communication program for calculating a sound wave transmission probability by calculating a correlation value between sound data included in the sound wave and pre-registered waveform data, and transmitting a received sound wave according to the sound wave transmission probability .