JP2019049921A - Communication system, communication method, and program - Google Patents

Abstract

To improve the consistency and security of communication using voice as a transmitting media.SOLUTION: A communication system 1 includes a communication terminal 200 which a user owns, a store terminal installed in a store, and a server which is so connected to be able to communicate with the store terminal to each other via a network 9. The communication terminal 200 sends transmitting information to a store terminal 999 by voice. The store terminal 999 receives the transmitting information by voice, then demodulates the received transmitting information, and sends the same to the server via the network 9. The server receives the demodulated transmitting information, carries out settlement processing, and then sends the settlement result to the store terminal via the network 9. The store terminal displays the settlement result received from the server.SELECTED DRAWING: Figure 1

Description

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

  In recent years, a technology has been used in which an individual is authenticated using a communication terminal such as a portable terminal, and an electronic payment such as point addition is performed. However, the network environment of the portable terminal is unstable depending on the situation, and under such circumstances, it has been difficult to perform electronic payment such as point addition. Therefore, it is considered that communication is performed using the network environment of the store side instead of the network environment of the portable terminal, and electronic settlement such as point addition is performed.

  As described above, in order to perform electronic settlement using a store-side network environment, for example, one that performs processing by acquiring a personal ID from a portable terminal by proximity communication using an inductive RFID (Radio Frequency Identifier) is known. ing. However, not all mobile terminals are equipped with an RF (Radio Frequency) tag. Therefore, various techniques have been proposed for performing authentication of such communication terminals by close proximity communication.

  For example, Patent Document 1 proposes a technique for performing authentication using speech as a transmission medium, such as outputting speech as transmission data on the portable terminal side and acquiring transmission data from the received speech. .

International Publication No. 2012/046885

  However, with the technology described in Patent Document 1, the output voice is recorded, and it is easily reproduced that the voice is reproduced later, and stable communication can not be secured, and the voice is accurately received. There was a problem that I could not do it. Therefore, it has not yet been sufficient in terms of the stability and security of communication using voice as a transmission medium.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a communication system, communication method and program capable of improving the stability and safety of communication using voice as a transmission medium. And

(1) In order to achieve the above object, the communication system according to the first aspect of the present invention is
A communication system including a communication terminal owned by a user, a shop terminal installed in a shop, and a server communicably connected to the shop terminal via a network.
The communication terminal includes transmission means for transmitting transmission information, which is information to be transmitted, to the shop terminal by voice.
The shop terminal is
Receiving means for receiving the transmission information in voice from the communication terminal;
Demodulation information transmitting means for demodulating the transmission information received by the receiving means and transmitting the information to the server via the network;
The server is
Demodulation information receiving means for receiving the demodulated transmission information from the shop terminal;
Settlement processing means for performing settlement processing based on the transmission information received by the demodulation information reception means;
And a settlement result transmission unit that transmits the settlement result in the settlement processing unit to the shop terminal via the network.
The shop terminal further includes a settlement result reception display unit that receives and displays the settlement result from the server.
It is characterized by

(2) Further, the communication system according to the second aspect of the present invention is
A communication terminal owned by the user, a shop terminal installed in the shop, a relay terminal relaying communication between the communication terminal and the shop terminal, and the shop terminal are communicably connected to each other via the network. A communication system including:
The communication terminal includes transmission means for transmitting transmission information, which is information to be transmitted, to the relay terminal by voice.
The relay terminal is
Receiving means for receiving transmission information in voice from the communication terminal;
And demodulation information transmitting means for demodulating the transmission information received by the receiving means and transmitting the demodulated information to the shop terminal through near field communication.
The shop terminal is
Demodulation information receiving means for receiving the demodulated transmission information;
Transmission information transmitting means for transmitting the transmission information received by the demodulation information receiving means to the server via the network;
The server is
Transmission information receiving means for receiving the transmission information from the shop terminal;
Settlement processing means for performing settlement processing based on the transmission information received by the transmission information reception means;
And a settlement result transmission unit that transmits the settlement result in the settlement processing unit to the shop terminal via the network.
The shop terminal further includes a settlement result reception display unit that receives and displays the settlement result from the server.
It is characterized by

(3) In addition, in the communication system of the above (2),
The shop terminal further includes a wireless transmission unit that transmits the settlement result received by the settlement result reception display unit to the relay terminal by near field communication.
The relay terminal further includes voice transmission means for receiving the settlement result from the shop terminal and transmitting the settlement result to the communication terminal by voice.
The communication terminal is
Voice receiving means for receiving the settlement result in voice from the relay terminal;
It further comprises demodulation display means for demodulating and displaying the settlement result received by the voice receiving means.
You may do so.

(4) In the communication system of (2) or (3) above,
The shop terminal further includes control signal transmitting means for transmitting a control signal for enabling the function of the receiving means by the relay terminal based on an operation by the user.
The relay terminal further includes notification means for notifying that the function of the receiving means has become effective when receiving the control signal transmitted from the shop terminal.
You may do so.

(5) In addition, in order to achieve the above object, the communication method according to the third aspect of the present invention is:
A communication method by a communication system including a communication terminal owned by a user, a shop terminal installed in a shop, and a server communicably connected to the shop terminal via a network.
The communication terminal executes a transmission step of transmitting transmission information, which is information to be transmitted, to the shop terminal by voice.
The store terminal is
A receiving step of receiving the transmission information by voice from the communication terminal;
Performing a demodulation information transmission step of demodulating the transmission information received in the reception step and transmitting the information to the server via the network;
The server
A demodulation information receiving step of receiving the demodulated transmission information from the shop terminal;
A settlement processing step of performing settlement processing based on the transmission information received in the demodulation information reception step;
Executing a settlement result transmitting step of transmitting the settlement result in the settlement processing step to the store terminal via the network;
The shop terminal further executes a settlement result reception display step of receiving and displaying the settlement result from the server;
It is characterized by

(6) Further, in order to achieve the above object, a program according to a fourth aspect of the present invention is:
A program in a communication system including a communication terminal owned by a user, a shop terminal installed in a shop, and a server communicably connected to the shop terminal via a network.
Allowing the communication terminal to function as transmission means for transmitting transmission information, which is information to be transmitted, to the shop terminal by voice.
The store terminal,
Receiving means for receiving the transmission information by voice from the communication terminal;
The transmission information received by the reception unit is demodulated to function as a demodulation information transmission unit that transmits the information to the server via the network.
The server,
Demodulation information receiving means for receiving the demodulated transmission information from the shop terminal;
Settlement processing means for performing settlement processing based on the transmission information received by the demodulation information reception means;
Allowing a settlement result in the settlement processing means to function as a settlement result transmission means for transmitting the settlement result to the shop terminal via the network,
Allowing the shop terminal to further function as a settlement result reception display means for receiving and displaying the settlement result from the server,
It is characterized by

  According to the present invention, the stability and security of communication using voice as a transmission medium can be improved.

It is a block diagram showing an example of the communications system concerning an embodiment of the present invention. It is a block diagram showing an example of a communication terminal concerning an embodiment of the present invention. (A) shows an example of the circuit which a transmission part has, (b) is a figure which shows an example of the circuit which a receiving part has. It is a block diagram showing an example of the point payment server concerning an embodiment of the present invention. It is a flowchart which shows an example of a process of an information processing apparatus, a communication terminal, and a point payment server. It is a flowchart which shows an example of a one-time key generation process. (A) is an example of transmitting data using a frequency modulation method, (b) is an example of transmitting data using a phase modulation method, (c) is using a frequency modulation method and a phase modulation method It is a figure which shows the example which transmits data. It is a figure for demonstrating the transmission method of an audio | voice signal. It is a flow chart which shows an example of transmission data generation processing. It is a flow chart which shows an example of attestation processing. It is a block diagram showing an example of the attestation system in a modification. It is a figure for demonstrating the transmission method of the audio | voice signal in a modification.

  First, a communication system 1 according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 1, the communication system 1 includes an information processing apparatus 100, a communication terminal 200, and a point payment server 300 that can communicate with the information processing apparatus 100 via the network 9. As illustrated, both the information processing apparatus 100 and the communication terminal 200 are in the store 999. The function of the information processing apparatus 100 in this embodiment is incorporated in the settlement terminal of the store 999, and the information processing apparatus 100 in this embodiment is a settlement terminal of the shop 999. The settlement terminal has a function of performing general settlement processing such as commodity purchase, although the description is omitted.

  As shown in FIG. 1, the information processing apparatus 100 connects the storage unit 110, the control unit 120, the input unit 130, the output unit 140, the detection unit 150, the communication unit 160, and the like to one another. And a bus 99. The information processing apparatus 100 in this embodiment functions as an authentication apparatus, and also functions as a relay apparatus for point payment processing such as processing for giving points. Although details will be described later, the information processing apparatus 100 has a function of generating a one-time key as authentication information having an expiration date and outputting the one-time key to the communication terminal 200 and a function of authenticating the legitimacy of the communication terminal 200. doing. Further, the user ID (membership number, password, etc.) received from the communication terminal 200 is transmitted to the point settlement server 300 via the network 9, and the point settlement process (settlement process related to point addition according to the settlement amount) is performed. It has a function.

  The storage unit 110 is configured of a hard disk, a memory, and the like, and stores the program 111. The program 111 is software for executing a process of generating and updating a one-time key and a process of authenticating the legitimacy of the communication terminal 200. Although not shown, the storage unit 110 stores a one-time key generated by a one-time key generation unit 121 described later, its expiration date, transmission data received from the communication terminal 200, and the like.

  The control unit 120 is configured of a CPU (Central Processing Unit) or the like. The control unit 120 operates according to the program 111 stored in the storage unit 110, and executes processing according to the program 111. The control unit 120 includes, as main functional units provided by the program 111, a one-time key generation unit 121 and an authentication processing unit 122.

  The one-time key generation unit 121 has a function of executing a process of generating a one-time key (one-time key generation process). The one-time key is information that has a predetermined expiration date and is valid only once (only in one authentication). The one-time key generation unit 121 generates a one-time key by a general method based on the detection unit 150 detecting that the communication terminal 200 has approached the information processing apparatus 100.

  The authentication processing unit 122 has a function of executing processing (authentication processing) for authenticating the legitimacy of the communication terminal 200. When receiving the transmission data from the communication terminal 200, the authentication processing unit 122 authenticates whether or not the communication terminal 200 is valid based on the one-time key included in the transmission data.

  The input unit 130 is a device for inputting audio data such as a microphone. Specifically, the input unit 130 receives the transmission data output from the communication terminal 200, demodulates it, and inputs it to the control unit 120.

  The output unit 140 is a device for outputting audio data such as a speaker. Specifically, the output unit 140 converts (modulates) the one-time key generated by the one-time key generation unit 121 into audio data, and outputs the converted audio data of the one-time key to the communication terminal 200. In addition, the output unit 140 includes a display device such as a general monitor, and the output unit 140 displays the point processing result received from the point settlement server 300.

  The detection unit 150 includes, for example, a proximity sensor, and detects that the distance between the information processing apparatus 100 and the communication terminal 200 is within a predetermined distance (for example, 7 cm). When detecting that the communication terminal 200 has approached the information processing apparatus 100, the detection unit 150 outputs a detection signal to the control unit 120. The one-time key generation unit 121 of the control unit 120 starts one-time key generation processing based on the detection signal. Note that the detection unit 150 can detect how long the distance between the information processing apparatus 100 and the communication terminal 200 is within a predetermined distance (for example, 7 cm) or less. . Although the detection unit 150 in this embodiment detects an example in which the distance between the information processing apparatus 100 and the communication terminal 200 is within 7 cm as a predetermined distance, 7 cm is merely an example. It is not limited to 7 cm as long as audio data can be suitably transmitted and received. That is, the distance at which voice data can be suitably transmitted and received may be set as a predetermined distance by an experiment or the like. Also, as the predetermined distance, different distances may be set according to the type of proximity sensor.

  The communication unit 160 is an interface that can be connected to a communication network such as the Internet. The communication unit 160 mutually communicates with the point payment server 300 via the network 9. The communication unit 160 communicates with the communication unit 330 of the point settlement server 300 via, for example, a dedicated line, and transmits and receives necessary information. In addition, the communication unit 160 may have a function of transmitting and receiving necessary information by performing communication using BLE (Bluetooth Low Energy) which is a standard of Bluetooth (registered trademark) formulated for the purpose of low power consumption. .

  The communication terminal 200 is, for example, a mobile phone, a smart phone, a tablet terminal, etc. As shown in FIG. 2, the storage unit 210, the control unit 220, the input unit 230, the output unit 240, and these are mutually connected. And a system bus 98.

  The storage unit 210 is configured of a hard disk, a memory, and the like, and stores the program 211. The program 211 is software that executes a process of generating transmission data to be output to the information processing apparatus 100. Although not shown, the storage unit 210 includes various data such as a member number and a password, transmission data generated by a transmission data generation unit 221 described later, and a one-time key received from the information processing apparatus 100. Voice data etc. are stored.

  The control unit 220 includes a CPU and the like. The control unit 220 operates in accordance with the program 211 stored in the storage unit 210, and executes processing in accordance with the program 211. The control unit 220 includes a transmission data generation unit 221 as a main functional unit provided by the program 211.

  The transmission data generation unit 221 has a function of executing a process of generating transmission data to be output to the information processing apparatus 100 (transmission data generation process). When the transmission data generation unit 221 receives audio data of the one-time key from the information processing apparatus 100, for example, the received audio data is added (added in a demodulated state) to data such as a membership number or password and transmitted Generate data.

  The input unit 230 is a device for inputting audio data such as a microphone. Specifically, the input unit 230 receives the audio data of the one-time key output from the information processing apparatus 100, demodulates the audio data, and inputs the demodulated data to the control unit 220.

  The output unit 240 is a device such as a speaker for outputting audio data. Specifically, the output unit 240 converts (modulates) the transmission data generated by the transmission data generation unit 221 into audio data, and outputs the audio data of the converted transmission data to the communication terminal 200. In this embodiment, an example in which transmission data is converted into voice data by the output unit 240 is shown. However, when transmission data is generated by the transmission data generation unit 221, it may be generated as sound data. (It may be modulated by the transmission data generation unit 221).

  Here, a communication method adopted in communication using voice as a transmission medium in the information processing apparatus 100 and the communication terminal 200 will be described. The information processing apparatus 100 and the communication terminal 200 employ orthogonal frequency division multiplexing (OFDM). OFDM is a type of multi-carrier transmission, in which a plurality of carriers are closely arranged within a predetermined frequency range so as not to interfere with adjacent carriers, and a limited frequency range is efficiently used. By using OFDM, multicarrier can be realized without enlarging the occupied frequency band. In general, IFFT (Inverse Fast Fourier Transform) is used for modulation of OFDM, and FFT (Fast Fourier Transform) is used for demodulation. The IFFT and FFT are performed for each symbol.

  Since OFDM is a multicarrier transmission scheme, any modulation scheme (primary modulation scheme) can be selected for each carrier (subcarrier). In the present embodiment, for the reasons to be described later, the first modulation scheme (Frequency Shift Keying: FSK) and the second modulation scheme (Binary Phase Shift Keying: BPSK) And modulate each subcarrier.

  In FSK, different subcarriers in two frequency bands are used as a pair, and different values are assigned to each. Therefore, in FSK, binary (one bit) information can be represented using two subcarriers per symbol.

  BPSK is a phase shift keying (PSK) that uses two phase waves separated by 180 °, and assigns different values to each phase. BPSK can represent binary (1 bit) information per symbol.

  In order to realize the above configuration, the output unit 140 of the information processing apparatus 100 and the output unit 240 of the communication terminal 200, and the input unit 130 of the information processing apparatus 100 and the input unit 230 of the communication terminal 200 have the following circuits. . First, FIG. 3A shows an example of a configuration of a circuit included in the output unit 140 of the information processing apparatus 100 and the output unit 240 of the communication terminal 200. The output unit 140 of the information processing apparatus 100 and the output unit 240 of the communication terminal 200 include a mapping circuit 1611, a subcarrier modulation circuit 1612, an IFFT circuit 1613, and a frequency conversion circuit 1614.

  The control unit 120 of the information processing apparatus 100 and the control unit 220 of the communication terminal 200 process the data sequence to be transmitted, divide it into data of a predetermined size (1 bit), and supply each divided data to the mapping circuit 1611 . The mapping circuit 1611 maps each divided data to each symbol section of each subcarrier. As described above, since subcarriers are modulated by FSK and BPSK, one bit is allocated to one symbol section of one subcarrier. After that, the subcarrier is modulated by FSK and BPSK in the subcarrier modulation circuit 1612, inverse discrete Fourier transformed in the IFFT circuit 1613, and converted to a time signal, so that the target audio frequency band is converted in the frequency conversion circuit 1614. It is converted and output to each speaker.

  FIG. 3B illustrates an example of the configuration of the circuits included in the input unit 130 of the information processing apparatus 100 and the input unit 230 of the communication terminal 200. The input unit 130 of the information processing apparatus 100 and the input unit 230 of the communication terminal 200 include a frequency conversion circuit 1621, an FFT circuit 1622, a demodulation circuit 1623, and a demapping circuit 1624. The voices collected by the respective microphones are converted to a predetermined frequency band by the frequency conversion circuit 1621 and are returned to the data of the frequency domain which has been discrete Fourier transformed by the FFT circuit 1622. After that, the subcarrier signal is demodulated by the demodulation circuit 1623 by the demodulation method corresponding to FSK and BPSK, and the demapping circuit 1624 restores data of a predetermined bit unit allocated to each subcarrier and each symbol section. The information is output to the control unit 120 of the information processing apparatus 100 and the control unit 220 of the communication terminal 200.

  Subsequently, the configuration of the point payment server 300 shown in FIG. 4 will be described. The point payment server 300 is an apparatus installed at a place different from the store 999, for example, a general-purpose computer. When the point settlement server 300 receives the user ID (member number and password) and the store ID from the information processing apparatus 100 via the network 9, the point settlement server 300 executes the settlement process (point settlement process) related to point addition according to the settlement amount. Then, the result of the point payment process is transmitted to the information processing apparatus 100 which is a payment terminal. In this embodiment, the point settlement server 300 gives points by way of example. However, other than this, the data such as settlement processing for merchandise purchase by electronic money, distribution of coupons, etc. Any matters relating to transmission and reception can be applied.

  As shown in FIG. 4, the point payment server 300 includes a storage unit 310, a control unit 320, a communication unit 330, and a system bus 97 for interconnecting them. In addition, the point payment server 300 is assumed to be provided with a function conventionally provided to a computer, and the description of the conventional function is omitted.

  The storage unit 310 functions as a main memory and a work memory for the control unit 320 to operate. The storage unit 310 includes, for example, a hard disk and a memory, and stores various types of information, fixed data, an application, screen data, an operation program executed by the control unit 320, and the like.

  In addition, the storage unit 310 stores a payment processing program 311 for executing processing relating to payment performed by the control unit 320. Furthermore, the storage unit 310 stores a user table 312 that stores information (a user ID, the remaining number of points, and the like) of a user who uses the communication system 1 in order to process payment. In addition, the storage unit 310 stores a shop table 313 that stores information (shop ID and the like) of a shop that uses the communication system 1 in order to process payment. The user table 312 and the shop table 313 may be stored at the time of use registration of the communication system 1 (at the time of first use registration).

  The control unit 320 includes, for example, a CPU, and controls each unit of the point payment server 300. The control unit 320 executes the payment processing program 311 stored in the storage unit 310 to execute processing relating to point payment.

  The communication unit 330 is an interface that can be connected to a communication network such as the Internet. The communication unit 330 communicates with the communication unit 160 of the information processing apparatus 100 via the network 9 to transmit and receive necessary information.

  The above is the configuration of the communication system 1. Subsequently, the overall operation of the communication system 1 will be described focusing on the operation of the information processing apparatus 100.

  First, when the information processing apparatus 100 is powered on, the process starts as shown in FIG. 5, and it is determined whether the distance between the information processing apparatus 100 and the communication terminal 200 is within a predetermined distance, that is, It is determined whether or not the detection unit 150 has detected proximity (step S101). If not detected by the detection unit 150 (step S101; No), the process of step S101 is repeated until it is detected.

  On the other hand, when it is detected by the detection unit 150 (step S101; Yes), the control unit 120 executes the one-time key generation processing by the function of the one-time key generation unit 121 (step S102). FIG. 6 is a flowchart showing an example of the one-time key generation process performed in step S102 of FIG. As shown in FIG. 6, the one-time key generation unit 121 of the control unit 120 first generates a one-time key (step S111). In the process of step S111, for example, the one-time key may be generated by a general one-time key generation method such as generation based on the current time. Note that the information processing apparatus 100 and the communication terminal 200 are kept close to each other until the authentication process is completed.

  After executing the process of step S111, the one-time key generation unit 121 converts (modulates) the generated one-time key into audio data by the output unit 140 and outputs the data (step S112), and the one-time key generation process ends Do. The execution of the process of step S112 causes the communication terminal 200 in proximity to receive the voice data of the one-time key. In the process of step S112, the sound is output at a sound volume (that is, the minimum sound volume that can be transmitted and received by voice within a range detected by the detection unit 150) previously determined by experiment or the like. In the process of step S112, the output volume of the one-time key may be adjusted and output so as to be different according to the distance between the information processing device 100 detected by the detection unit 150 and the communication terminal 200. For example, when the detection unit 150 detects that the distance is 2 cm, the output volume may be adjusted and output so as to be smaller than when it is detected that the distance is 7 cm. The output volume may be set in advance according to the separation distance.

  The generated one-time key is modulated by the process of step S112 and transmitted as audio data. In this embodiment, the communication using the audio as a medium is utilized in FIG. As shown, transmission data is multiplexed and transmitted by using a plurality of modulation schemes having mutually different characteristics which are different from each other (user ID as transmission data in the process of step S 212 in FIG. The same applies to the case of outputting voices and passwords). By using a plurality of modulation schemes with different characteristics, it is possible to reduce the possibility that each data will simultaneously cause a transmission error. Examples of mutually independent modulation schemes include FSK, PSK, and amplitude shift keying (ASK).

  Hereinafter, a case where subcarriers are modulated using FSK (first modulation scheme) and BPSK (second modulation scheme) will be described as an example. The combination of different modulation schemes is not limited to the above combination. For example, PSK and ASK may be used, or ASK and FSK may be used. In addition, as PSK, Quadrature Phase Shift Keying (QPSK), Differential Quadrature Phase Shift Keying (DQPSK), Differential Binary Phase Shift Keying (Differential Binary Phase Shift) Keying: DBPSK) may be used.

  FSK is a modulation scheme that transmits data by modulating the frequency of subcarriers. Since the phase is not used for subcarrier modulation, it is resistant to changes in the communication environment caused by movement of the communication terminal 200 or the like. However, since the frequency is used to modulate the subcarrier, the frequency use efficiency is low. FIG. 7A shows a specific example in which 1 channel and 0 channel of data are expressed using two channels (hereinafter, ch) in FSK combined with OFDM. It is 1 when ch1 is used and 0 when ch2 is used. In FSK, as shown in FIG. 7A, information corresponding to one bit can be transmitted per symbol section using two channels.

  BPSK is a modulation scheme that transmits data by modulating the phase of a subcarrier. Since frequency is not used for subcarrier modulation, the frequency use efficiency is excellent, but unlike FSK, it is weak to changes in the communication environment caused by the movement of the communication terminal 200 and the like. FIG. 7B shows a specific example in which 1 and 0 of data are expressed using two types of phases in BPSK. The case where the subcarrier starts from the mountain is 1 and the case where the subcarrier starts from the valley is 0. In BPSK, as shown in FIG. 7 (b), information of one bit can be transmitted per one symbol section by one ch.

  FIG. 7C shows an example in which different information is loaded on subcarriers using BPSK and transmitted while loading information on subcarriers using FSK. In the first symbol period, since the subcarrier of ch1 starts from the mountain, FSK data is 1 and BPSK data is 1. In the second symbol period, since the subcarrier of ch 2 starts from the mountain, FSK data is 0 and BPSK data is 1. In this way, different data can be transmitted on subcarriers using FSK and BPSK. As can be understood from FIG. 7C, when FSK and BPSK are used, data of 0.5 bit / ch can be transmitted per symbol section as FSK and 0.5 bit / ch per symbol section can be transmitted as BPSK. .

  Hereinafter, a process in which the output unit 140 modulates a subcarrier using FSK and BPSK according to the one-time key as transmission data will be specifically described. The same applies to the case where the user ID (membership number or password) or the like as transmission data is output by voice in the process of step S212 in FIG. In this example, the case where the number of subcarriers is 126 will be described as an example.

Hereinafter, in order to facilitate understanding, the bit string of transmission data is B ₁ , B ₂ , ..., B _n , B ₁ ', B ₂ ', ..., B _n '(n is a natural number), and the subcarrier is C _{1, C} 2, ..., and _{C 126.} Subcarriers C ₁ and C ₂ , subcarriers C ₃ and C ₄ ,..., And subcarriers C ₁₂₅ and C ₁₂₆ are paired, respectively, and are sequentially referred to as pairs P ₁ , P _{2 ,.} Here, it is assumed that the order of bit strings is not changed in data mapping.

Mapping circuit 1611, using FSK, the first symbol interval, the bit string _{B 1} pair _{P 1,} the bit string _{B 2} pair _{P 2,} ..., allocates the bit string _{B 63} sequentially paired _{P 63.} Then, the mapping circuit 1611, using FSK, allocated in the second symbol period, the bit string _{B 64} to the pair _{P 1,} the bit string _{B 65} into the pair _{P 2,} ..., a bit string _{B 126} sequentially paired _{P 63.}

  After that, as described above, the subcarrier modulation circuit 1612 modulates each subcarrier using FSK and BPSK according to the data assigned to each subcarrier.

The output unit 140 transmits data using FSK by selecting one of the subcarriers for each of the pairs P ₁ , P ₂ ,..., P ₆₃ . Then, the output unit 140 transmits data using BPSK by modulating the phase of the selected subcarrier. The output unit 140 may transmit the same data using FSK and BPSK, or may transmit different data using FSK and BPSK.

  As described above, in the communication method according to the present embodiment, since a plurality of modulation methods that are affected differently to changes in the communication environment are used, it is possible to prevent the occurrence of a data communication error, and the communication is stable. It is possible to improve the quality. When the change in the communication environment is large, for example, when the movement of the communication terminal 200 is large, the collected voice signal is demodulated using a portion modulated with FSK that is resistant to the change in the environment. It is only necessary to stably receive 5 bits / ch of data. On the other hand, when the change in the communication environment is small, additional data of 0.5 bit / ch can be added per symbol interval by additionally reading out the BPSK modulated part from the collected audio signal, so the total is 1 Information of 1 bit / ch can be received per symbol period.

  By the way, in order to perform multiplexing using different modulation schemes, it is also conceivable to adopt different modulation schemes for different subcarriers. However, in this case, since a large number of subcarriers need to be used, a wide frequency band is required. Also, since the transmission capability of the output unit 140 is limited, the energy per subcarrier decreases as the number of subcarriers increases. In the communication method according to the present embodiment, since subcarriers are modulated using FSK and BPSK, it is possible to improve frequency use efficiency and to realize energy efficiency to be used for transmission and reception of subcarriers. As described above, the same applies to the case where the user ID or the like (membership number or password) as transmission data is voice-outputted in the process of step S212 in FIG. 9 described later. That is, although the information processing apparatus 100 has been described as an example here, the same applies to the communication terminal 200.

  As described above, the information processing apparatus 100 (as well as the communication terminal 200) can transmit the same data in duplicate using two modulation schemes. Furthermore, the following method is employed to transmit data. If the communication speed is constantly reduced according to the case where the change in the communication environment is large in order to ensure the stability of communication, the communication time is extended, and the convenience of the user is impaired.

  Therefore, by devising and transmitting the transmission order of multiplexed data, the communication speed is increased or decreased according to the change of the environment. FIG. 8 shows an example of an image for transmitting data using FSK and BPSK. In the transmission image of FIG. 8, transmission data (one-time key) transmitted by the information processing apparatus 100 includes the first data D1, the second data D2, the third data D3, the fourth data D4, the fifth data D5, the sixth data. It comprises data D6.

  The information processing apparatus 100 changes the transmission order of the data D1 to D6 according to the modulation scheme to be used. Specifically, based on information (rules) defined in advance, a series of data to be transmitted is divided into two (D1 to D3 and D4 to D6), and data to be modulated by BPSK is a group of the latter half divided into two (D4 to D6) are transmitted first, and then the divided first half group (D1 to D3) is transmitted. On the other hand, data modulated by FSK transmits data D1 to D6 without changing the order. For example, as shown in FIG. 8, in the first symbol period, the first data D1 is loaded on FSK, and the fourth data D4 is loaded on BPSK. In the second symbol period, FSK carries the second data D2 and BPSK carries the fifth data D5.

  According to this configuration, when the communication state is normal, the receiving side can demodulate data from both FSK and BPSK, so in the first half of the communication, the group (D1 to D3) with FSK is BPSK When the group (D4 to D6) is received, all data can be received. For this reason, processing such as reception and demodulation in the second half is unnecessary. Therefore, the communication speed can be increased if the reception process can be completed more quickly and information can be restored from a plurality of modulation schemes as a result.

  Also, even if it is not possible to demodulate part or all of data from either FSK or BPSK due to bursty noise etc. in the first half of communication, the groups (D4 to D6) received as FSK in the second half of communication Since the received data can be correctly restored from the groups (D1 to D3) received as BPSK, stable communication can be realized.

  Furthermore, even if the data can not be demodulated by BPSK due to the change of the communication environment caused by the movement of the communication terminal 200 etc. throughout the first half and the second half of communication, the data can be demodulated by FSK, so stable communication can be realized.

  As described above, in the communication method according to the present embodiment, data is transmitted using a plurality of modulation methods having different characteristics with respect to the movement of communication terminal 200. Therefore, according to changes in communication environment such as movement of communication terminal 200. Thus, communication speed can be increased and stable communication can always be realized. Here, although the information processing apparatus 100 has been described as an example, the communication terminal 200 also has the same configuration as that described above.

  Returning to FIG. 5, when the process of step S102 is executed, the voice data of the one-time key is received by the communication terminal 200, and the process of the communication terminal 200 is started due to this. The voice data of the one-time key is received by the input unit 230 of the communication terminal 200 as described above, but the input unit 230 is set in a receivable state (a state where voice data can be received). It shall be. Also, the audio data received by the input unit 230 is demodulated by the input unit 230 to be bit string data.

  Here, the demodulation process performed by the communication terminal 200 will be described. The communication terminal 200 receives twice the same information from a signal modulated using FSK and BPSK, but performs demodulation processing in consideration of the quality of received data at the time of signal demodulation. The same applies to the case where transmission data is received by the input unit 130 of the information processing apparatus 100 after the process of step S201 in FIG. 5 described later is performed.

  Specifically, the input unit 230 of the communication terminal 200 receives an audio signal modulated using FSK and BPSK, and of the audio signal, a portion modulated by FSK and a portion modulated by BPSK. Each demodulate. Then, the input unit 230 determines whether the data obtained by demodulating the part where the voice signal is modulated by FSK by FSK and the data when the part modulated by BPSK is demodulated by BPSK each satisfy predetermined quality. . Whether or not the demodulated data satisfies a predetermined quality is, for example, the presence or absence of a defect in data determined using an error detection code such as CRC, the S / N ratio (Signal-Noise Ratio) or the strength of a received signal, etc. Is determined based on whether or not the predetermined value or more.

  Then, using the data determined to satisfy the predetermined quality, the voice signal is converted into reception data. After that, the input unit 230 executes subsequent processing such as subcarrier demodulation and demapping. Here, although the communication terminal 200 has been described as an example, as described above, the information processing apparatus 100 also has the same configuration.

  As described above, in the communication system 1, by having the above configuration, a part or all of the data can not be accurately demodulated from the audio signal modulated using one of the modulation schemes due to a transmission error or the like. A voice signal modulated using the other modulation scheme can also be used to demodulate the received data.

  Returning to FIG. 5, when the processing of the communication terminal 200 is started, the communication terminal 200 executes transmission data generation processing by the function of the transmission data generation unit 221 (step S201), and thereafter the communication terminal 200 ends the processing. FIG. 9 is a flowchart showing an example of transmission data generation processing performed in step S201 of FIG. As shown in FIG. 9, the transmission data generation unit 221 of the control unit 220 first receives the one-time information received from the information processing apparatus 100 as the information to be transmitted, such as the member number and password stored in the storage unit 210. The voice data of the key (demodulated bit string data) is added to generate transmission data (step S211).

  After executing the process of step S211, the transmission data generation unit 221 converts the generated transmission data into voice data by the output unit 240 and outputs the converted data (step S212), and ends the transmission data generation process. As described above, also in the process of step S212, transmission data is multiplexed and transmitted using a plurality of modulation schemes as in the process of step S112. By executing the process of step S212, the transmission data is received and demodulated by the information processing apparatus 100 in close proximity (the demodulation process is the same as that of the communication terminal 200). In addition, about the output sound volume in the process of step S212, as above-mentioned, if it is in the range detected by the detection part 150 of the information processing apparatus 100, it should just be the minimum sound volume which can transmit / receive by an audio | voice. Specifically, in the process of step S212, the sound may be output at the same volume as the volume received by the input unit 230 of the communication terminal 200.

  As described above, according to the processing of step S112 of FIG. 6 and the processing of step S212 of FIG. It is output. Therefore, for example, it is prevented that a one-time key is received by a communication terminal (a communication terminal which is not a target) which is not detected by the detection unit 150 of the information processing apparatus 100 although the distance to the communication terminal 200 is short. Can. Further, when the output volume of the communication terminal of the non-target communication terminal is large, the voice output by the non-target communication terminal is received by the information processing apparatus 100. In this case, Since the one-time key is different (the non-target communication terminal uses another one-time key), the authentication is not successful. Therefore, fraud can be suitably prevented.

  Returning to FIG. 5, when the process of step S201 is executed, transmission data is received by the input unit 130 of the information processing apparatus 100, and the information processing apparatus 100 performs an authentication process due to this (step S103). . The transmission data received by the input unit 130 is subjected to demodulation processing by the input unit 130 as described above, and becomes bit string data.

  FIG. 10 is a flowchart showing an example of the authentication process performed in step S103 of FIG. As shown in FIG. 10, the authentication processing unit 122 of the control unit 120 first determines whether the one-time key generated by the one-time key generation unit 121 matches the one-time key included in the transmission data. Is determined (step S131). Specifically, in the process of step S131, first, the one-time key included in the transmission data that has been demodulated to become bit string data is extracted. Then, it is determined whether or not the extracted one-time key matches the one-time key generated by the one-time key generation unit 121. As described above, since the one-time key generated by one-time key generation unit 121 is stored together with the expiration date in storage unit 110, the expiration date of the one-time key stored in storage unit 110 If the process of step S131 is not performed, the process of step S134 described later may be performed without executing the process of step S131. That is, the expiration date of the one-time key of the storage unit 110 is first confirmed, and the process of step S131 may be executed only when the expiration date is reached. The one-time key whose expiration date has passed may be deleted from the storage unit 110 when the expiration date has passed.

  If it is determined in step S131 that the one-time keys match (step S131; Yes), the authentication processing unit 122 determines that the authentication is successful (step S132). Specifically, in the process of step S132, the communication terminal 200 may be notified of an authentication result, such as voice output indicating that authentication has succeeded. As described above, the subsequent process may be performed. After executing the process of step S132, the authentication processing unit 122 deletes the one-time key stored in the storage unit 110 (step S133), and ends the authentication process. On the other hand, when it is determined that the one-time keys do not match (including the case where the one-time key is not stored in the storage unit 120 or the expiration date) (step S131; No), the authentication processing unit 122 performs authentication. It is determined that a failure has occurred (step S134), and the authentication process is ended. Specifically, in the process of step S134, the communication terminal 200 may be notified of the authentication result, for example, by outputting a voice indicating that the authentication has failed.

  Returning to FIG. 5, after executing the process of step S103, the control unit 120 determines whether the authentication has succeeded by the function of the authentication processing unit 122 (step S104). If the authentication fails (step S104; No), the information processing apparatus 100 ends the process as it is.

  On the other hand, if the authentication is successful (step S104; Yes), the control unit 120 transmits a message requesting the point settlement server 300 to execute the settlement process (step S105). Specifically, in the process of step S105, a message requesting settlement processing via the communication unit 160, a user ID (member number or password) for performing the point settlement processing, a shop ID of the request source, and a settlement amount And the communication unit 330 of the point settlement server 300. When the message is transmitted to the point settlement server 300, the processing of the point settlement server 300 is started.

  When the process of the point payment server 300 is started, the point payment server 300 executes the point payment process, transmits the execution result to the information processing apparatus 100 (step S301), and ends the process. In the point payment process of step S301, first, the user table 312 stored in the storage unit 310 and whether the user ID (member number or password) received from the information processing apparatus 100 and the shop ID are valid or not It authenticates by comparing with the store table 313. And when authentication is successful, the point according to the amount shown by the received settlement amount is given. Specifically, the number of points according to the payment amount is added to the remaining number of points in the user table 312. Then, the user ID and the remaining number of points (point processing result) are transmitted to the information processing apparatus 100. If the authentication fails, information indicating that the authentication failed may be transmitted as the point processing result.

  Subsequently, when the information processing apparatus 100 receives the point processing result from the point payment server 300, the information processing apparatus 100 performs point display processing for displaying the processing result on the monitor included in the output unit 240 (step S106), and ends the processing.

  The above is the operation in the communication system 1 centering on the information processing apparatus 100. As described above, the information processing apparatus 100 according to the present embodiment generates a one-time key effective for one authentication and outputs the one-time key by voice. Then, the transmission data from the communication terminal 200 is voice input, and the legitimacy of the communication terminal 200 is determined based on whether or not the onetime key included in the transmission data matches the onetime key generated and output immediately before. . That is, it is authenticated as valid only when the one-time key included in the transmission information received from communication terminal 200 matches the one-time key at the time of generation. Therefore, it is possible to prevent a fraud that is reproduced after being recorded. Therefore, the security in authentication using voice as a transmission medium can be improved to prevent fraud. Further, as shown in FIG. 7, the information processing apparatus 100 according to the present embodiment makes use of a plurality of modulation schemes having different characteristics which are independent of each other, utilizing communication that uses voice as a medium. , Transmit data multiplexed. By using a plurality of modulation schemes with different characteristics, it is possible to reduce the possibility that each data will simultaneously cause a transmission error. That is, since a plurality of modulation schemes that are affected differently to changes in the communication environment are used, it is possible to prevent the occurrence of data communication errors, and improve the stability of communication.

  In addition, when the detection unit 150 of the information processing apparatus 100 detects that the distance between the information processing apparatus 100 and the communication terminal 200 is within a predetermined distance (for example, 7 cm), the one-time key is voice output. . Therefore, the output sound volume of the one-time key can be set to a sound volume that can be received by the communication terminal 200 in the close proximity, and it is possible to prevent another person from recording the sound.

(Modification)
The present invention is not limited to the above embodiment, and various modifications and applications are possible. It is not necessary to have all the technical features shown in the above embodiment, and some of the configurations described in the above embodiment so as to be able to solve at least one problem in the prior art. It may be. Further, the configurations shown in the following modifications may be combined respectively.

  Although the said embodiment demonstrated as a thing with the function of the information processing apparatus 100 being incorporated in the payment terminal of the shop 999 (that is, the information processing apparatus 100 is a payment terminal), this is an example. The function of the information processing apparatus 100 does not have to be built in the settlement terminal of the store 999. For example, as shown in FIG. 11, it is built in the relay apparatus that relays the communication terminal 200 and the settlement terminal 900. It is also good. That is, the information processing apparatus 100 may be a relay apparatus that relays the communication terminal 200 and the payment terminal 900. The relay device may have a size suitable for performing voice communication with the communication terminal 200 in close proximity.

  In this case, in the process of step S105 shown in FIG. 5, the information processing apparatus 100 may transmit a message requesting the settlement terminal 900 to execute the settlement process, and the other processes are performed in the same manner as in the above embodiment. It is good. In the process of step S105, a message requesting settlement processing via the communication unit 160 may be transmitted to the settlement terminal 900 together with a user ID (member number or password) for performing the point settlement processing. At this time, unlike the above embodiment, the communication unit 160 does not transmit via a dedicated line, but BLE (Bluetooth Low Energy) which is a standard of Bluetooth (registered trademark) formulated for the purpose of low power consumption. It may be sent by). Then, the settlement terminal 900 adds the shop ID to the received information and transmits it to the communication unit 330 of the point settlement server 300, and the settlement terminal 900 displays the execution result of the point settlement processing received from the point settlement server 300. Just do it.

  Here, performing voice communication by bringing the speaker of the communication terminal 200 close to the microphone of the information processing apparatus 100 which is a shop terminal depends on the size of the shop terminal, the position of the microphone, and the like, and it is difficult. In addition, there are many cases where the shop terminal is installed in advance, and adding a function of the information processing apparatus 100 newly requires a large cost. Therefore, when the relay device has the function of the information processing device 100, it is possible to avoid the difficulty of making voice communication close to the microphone of the information processing device 100 which is a shop terminal and stable voice. It can communicate.

  Furthermore, the information processing apparatus 100 as a relay apparatus may receive the execution result of point settlement processing received by the settlement terminal 900 from the point settlement server 300 from the settlement terminal 900 by BLE (also, by wired communication) May be received). Then, the information processing apparatus 100 may modulate the received execution result of the point payment processing using the plurality of modulation methods described in the above embodiment and transmit the result to the communication terminal 200 by voice. Then, the communication terminal 200 may display the received execution result on the output unit 240 of the communication terminal 200.

  Note that the user of the communication terminal 200 can access the point payment server 300 via the network of the communication terminal 200, and can refer to the execution result of the point payment process by the access. However, the network environment of the communication terminal 200 is unstable depending on the situation. Therefore, the information processing apparatus 100 transmits the execution result of the point settlement process to the communication terminal 200 by voice as described above, thereby making the user surely recognize the execution result of the point settlement process regardless of the network environment. be able to.

  In addition, the information processing apparatus 100 as a relay apparatus may make detection by the detection unit 150 effective by receiving a control command transmitted from the payment terminal 900, for example. Specifically, on the settlement terminal 900 side, a control command for validating the detection of the detection unit 150 of the information processing apparatus 100 may be transmitted based on an operation by an operator (such as a clerk) of the settlement terminal 900. Then, on the side of the information processing apparatus 100, the detection by the detection unit 150 is validated based on the reception of the control command, and the user of the communication terminal 200 is notified that the detection by the detection unit 150 is validated. do it. The notification may be performed, for example, by sound notification or lighting an LED (Light Emitting Diode) provided in the relay device.

  According to this, it is possible to prevent unnecessary detection on the side of the information processing apparatus 100, and it is possible to notify the user of the communication terminal 200 that it should be approached, so that suitable point settlement processing can be performed. It can be carried out.

  In the above embodiment, in the transmission data generation process, an example in which the transmission data generation unit 221 of the communication terminal 200 generates transmission data by adding (adding in a demodulated state) the received voice data of the one-time key Although shown, this is an example. For example, in the process of step S211 of FIG. 9, the transmission data generation unit 221 simply adds (adds in a demodulated state) the voice data of the one-time key to the information to be transmitted such as a membership number and a password. Instead, the information to be transmitted may be encrypted with the received and demodulated one-time key. In addition to encryption, information to be transmitted may be calculated using the received and demodulated one-time key (for example, adding the one-time key). Then, encrypted or calculated information may be used as transmission data, and in this case, for example, information to be transmitted may be added to the information to be transmitted, such as adding a remainder obtained by squaring the information to be transmitted and dividing by 5. A predetermined hash function may be applied to the data, and the result (hash value) may be added to the transmission data.

  Then, in the process of step S 212 in FIG. 9, the generated transmission data and the hash value may be converted into voice data by the output unit 240 and may be output to the information processing apparatus 100. On the side of the information processing apparatus 100, in the authentication process of FIG. 10, before the process of step S131, voice data of transmission data and hash value received from the communication terminal 200 are demodulated into bit string data, and transmission data is one time Decryption is performed using the one-time key generated by the key generation unit 121 (returning to the state before the operation). Then, in the process of step S132, a predetermined hash function may be applied to the decrypted transmission data, and it may be determined whether the result (hash value) matches the received hash value. The process when the one-time key has expired is the same as that of the above embodiment. Then, when the hash values match, it is determined that the authentication is successful, and in the case of the non-coincidence (same as the above embodiment), it may be determined that the authentication is failed. The hash function is assumed to be stored in advance in each of the storage units of the information processing apparatus 100 and the communication terminal 200. According to this, since the one-time key and the hash value are not authenticated if they are not valid, security can be improved more than simply adding the one-time key, and fraud can be further prevented.

  In addition, whether to add the one-time key only to the information to be transmitted or to encrypt or calculate the information to be transmitted using the one-time key, for example, the distance between the information processing apparatus 100 and the communication terminal 200 It may be selectable accordingly. Specifically, when the distance between the information processing apparatus 100 and the communication terminal 200 is less than a predetermined distance, only the one-time key is added to the transmission target information, and the distance is not less than the predetermined distance. In this case, the information to be transmitted may be encrypted or calculated using the one-time key. According to this, since suitable security can be secured according to the distance, fraud can be prevented while reducing the processing load.

  Also, in the above modification, an example in which information to be transmitted is encrypted or calculated with a one-time key is shown, but in addition to this, information to be transmitted is a one-time key and a secret unique to each communication terminal. The key may be used to encrypt or calculate. Specifically, the communication terminal 200 receives in advance identification information for identifying the communication terminal 200 from an encryption server that can mutually communicate via the network, and a secret key corresponding to the identification information (once received After that, communication between the communication terminal 200 and the server is unnecessary. Then, in the transmission data generation process of FIG. 9, the information to be transmitted, such as the member number and the password, etc., the one-time key (demodulated state) received from the information processing apparatus 100 and the secret key received from the encryption server , Or may be used to generate transmission data. In this case, a hash value may be added to the transmission data as in the above modification, and identification information received from the server may be added to the transmission data. That is, in the process of step S212 in FIG. 9, the output unit 240 may convert (modulate) the generated transmission data, the hash value, and the identification information into audio data and output the audio data to the information processing apparatus 100.

  On the side of the information processing apparatus 100, in the authentication process of FIG. 10, before the process of step S131, the transmission data, the hash value, and the identification information received from the communication terminal 200 are demodulated to be bit string data. Decryption is performed using the one-time key generated by the time key generation unit 121 and the secret key (returning to the state before the operation). Then, in the process of step S132, a predetermined hash function may be applied to the decrypted transmission data, and it may be determined whether the result (hash value) matches the received hash value. For example, the secret key is stored in advance in the storage unit 110 of the information processing apparatus 100 in association with the identification information of the communication terminal 200, and if the secret key is specified from the storage unit 110 based on the received identification information. Good. Also, for example, the secret key may be calculated by calculation according to a predetermined rule based on the identification information. The subsequent processing is the same as that of the above-described modification. According to this, security can be further improved.

  In addition to this, for example, the identification information may be encrypted or calculated with the one-time key on the communication terminal 200 side, and the information to be transmitted may be encrypted or calculated with the one-time key and the secret key. Good. Then, on the side of the information processing apparatus 100, the identification information is first decrypted by the one-time key, and the secret key is acquired based on the identification information. Then, the transmission data may be decrypted using the acquired secret key and the one-time key. According to this, security can be further improved.

  In the above embodiment, as shown in FIG. 1, the information processing apparatus 100 includes one output unit 140, but this is an example. The information processing apparatus 100 may include a plurality of output units 140. In this case, the output units 140 may be provided at different positions and at positions where voices uniformly spread around the periphery. According to this, it is possible to output the sound at a more preferable output volume.

  For example, even if the distance between the information processing apparatus 100 and the communication terminal 200 is a distance detected by the detection unit 150, the distance between the input unit 230 of the communication terminal 200 and the output unit 140 of the information processing apparatus 100 is large. There is also a problem. In such a case, if the output sound volume of the information processing apparatus 100 is small, an event may occur in which the communication terminal 200 can not receive voice accurately. On the other hand, when the output sound volume is increased, there is a possibility that the signal may be received by an unintended communication terminal. Therefore, by providing the output units 140 at positions where voices can spread all around, the distance between the input unit 230 of the communication terminal 200 and the output unit 140 of the information processing apparatus 100 becomes substantially constant, and voices can be generated at suitable output volumes. Can be output.

  Furthermore, the information processing apparatus 100 may include a plurality of detection units 150 corresponding to the plurality of output units 140. Then, the voice output may be performed only from the output unit 140 corresponding to the detection unit 150 that detects that the communication terminal 200 has approached among the plurality of detection units 150. According to this, it is possible to prevent unnecessary output from the output unit 140, output voice with suitable output voice, and further improve security.

  Further, in the above-described embodiment, in the process of step S112 of FIG. 6, the sound volume (that is, within the range detected by the detection unit 150) determined in advance by experiment etc. An example is shown in which the one-time key is output at the volume), but this is an example. As described above, the volume output in step S112 may not be a constant volume, and may be, for example, a volume in consideration of ambient noise and the like. Specifically, when the volume of surrounding noise is large, the volume needs to be increased to such an extent that voice communication between the information processing apparatus 100 and the communication terminal 200 does not fail. However, since the volume of the ambient noise changes with the passage of time, if the volume of the ambient noise decreases, if the output volume remains high, the security is degraded. Therefore, it is necessary to change the output volume according to the volume of the surrounding noise.

  In this example, the volume of surrounding noise is measured by the input unit 130 of the information processing apparatus 100 during the period in which the one-time key is voice-outputted in step S112 of FIG. 6, and the output volume is adjusted to the volume of the noise You can adjust it. Specifically, the volume of the measured noise may be divided into a plurality of stages, and output may be performed at an output volume according to the stage. The sound volume of the surrounding noise may be similarly measured for the sound output of the communication terminal 200 in step S212 of FIG. 9 to adjust the output sound volume. According to this, it is possible to output at a suitable volume according to the surrounding situation, and it is possible to prevent a drop in security. When measuring the volume of ambient noise, the volume of noise in a frequency band generally used for voice communication may be measured, and noise in an unused frequency band may not be considered.

  Also, for example, as in the above modification, a plurality of output units 140 (the same applies to the detection unit 150) are provided around the information processing apparatus 100, and a plurality of input units 130 are provided correspondingly. The user may be notified that the communication terminal 200 should be moved to the lowest position of the volume of surrounding noise before the output of. For example, the volume of surrounding noise is measured by each of the plurality of input units 130 provided around the information processing apparatus 100, and the input unit 130 determined to be the lowest noise volume among the plurality of input units 130 A notification sound may be output from the corresponding output unit 140, and the user may be prompted to move the communication terminal 200 to the position of the output unit 140. Then, based on the detection by the corresponding detection unit 150, the voice output of the one-time key may be performed. According to this, the influence of noise can be reduced and security can be improved.

Further, in the above embodiment, the output unit 140 and the output unit 240 convert (modulate) data (bit string data) to be transmitted into audio data, and the input unit 130 and the input unit 230 demodulate the audio data received. Although an example in which bit string data is used is described above, these may be performed by the control unit 120 and the control unit 220, respectively.

  Further, in the above embodiment, for example, transmission data is doubled and transmitted by using FSK and BPSK carrying the same data, but as shown in FIG. By transmitting the same data in the band, transmission data may be multiplexed in quadruple and transmitted.

  First, multiplexing of frequency bands will be described. Communication terminal 200 has two bands of 15.9 kHz to 17.9 kHz (first voice frequency band) and 17.9 kHz to 19.9 kHz (second voice frequency band) for communication using voice as a medium. use. The above-mentioned band takes into consideration the frequency characteristics of a speaker that is typically mounted on a smartphone or the like.

  At the time of transmission, the communication terminal 200 transmits the same data in two bands of low band 15.9 kHz to 17.9 kHz and high band 17.9 kHz to 19.9 kHz, respectively. That is, the signal of 15.9 kHz to 17.9 kHz and the signal of 17.9 kHz to 19.9 kHz are modulated with data to be transmitted.

  Specifically, the frequency conversion circuit 1614 shown in FIG. 3 converts the output of the IFFT circuit 1613 into a low band and a high band, and transmits the same data in the low band and the high band. From the speaker of the output unit 140, an audio signal in a band of 15.9 kHz to 17.9 kHz (first audio signal) and an audio signal in a band of 17.9 kHz to 19.9 kHz (second audio signal) are output. Ru.

  As described above, the communication terminal 200 transmits the same data in duplicate using two frequency bands, but further transmits data using the following method. FIG. 12 illustrates an example of transmitting data by simultaneously multiplexing data by using two frequency bands and multiplexing data by using two modulation schemes. In FIG. 12, for example, D1 (D2) indicates that data transmitted by FSK is D1 and data transmitted by BPSK is D2.

  For example, the communication terminal 200 divides transmission data into first data D1, second data D2, third data D3, and fourth data D4 and transmits. Communication terminal 200 changes the transmission order of data D1 to D4 according to the frequency band to be used and the modulation method. Specifically, based on the information defined in the transmission order definition information, data is transmitted in the order of D1, D3, D4, D2 in low band FSK, and in low band BPSK, D2, D4, D3,. Send data in the order of D1. Also, in the high band FSK, data is transmitted in the order of D4, D2, D1, and D3, and in the high band BPSK, data is transmitted in the order of D3, D1, D2, and D4. In other words, different data are transmitted at the same timing for each frequency band and modulation scheme.

  According to this configuration, if the communication state is normal, all data can be received by receiving D1 and D2 in the low band and D3 and D4 in the high band in the first symbol period. Reception and demodulation after the 2 symbol interval are unnecessary.

  Also, for example, even if the data modulated by BPSK can not be demodulated due to the movement of the communication terminal 200, the portion where the voice signal is modulated by FSK is D1 in the low band and D4 in the high band in the first symbol period. Since it is possible to receive all data by receiving D3 in the low band and D2 in the high band in the second symbol period, it is unnecessary to receive and demodulate in and after the third symbol period.

  Furthermore, even if there is frequency interference throughout the communication and transmission in either the low band or the high band is disabled, the received data can be correctly restored only in one of the bands that can be transmitted normally. For example, assuming that the low band can be transmitted normally, it is possible to receive D1 with FSK in the first symbol interval, D2 with BPSK in the first symbol interval, D3 with FSK in the second symbol interval with D4 with BPSK, and receive all data. Reception, demodulation, etc. after the 3 symbol section become unnecessary.

  Then, even if there is frequency interference throughout the communication, and even if the BPSK modulated data can not be demodulated due to the movement of the communication terminal 200, correctly received data from FSK only in one of the bands that can be transmitted normally. Can be restored. For example, assuming that the low band can be transmitted normally, data can be received in the order of D1, D3, D4, and D2 using FSK.

  Although the communication terminal 200 has been described as an example in this modification, the information processing apparatus 100 also has a similar configuration.

  Next, demodulation processing performed by communication terminal 200 will be described. Communication terminal 200 receives the same information in quadruple from signals modulated using different frequency bands and different modulation schemes, but performs demodulation processing in consideration of the quality of received data when demodulating signals. Do.

  Specifically, the input unit 230 of the communication terminal 200 receives an audio signal, demodulates a subcarrier, demodulates the data in which the signal is demodulated by FSK, and demodulates the portion modulated by BPSK. It is determined whether each set of data satisfies a predetermined quality. Also, the input unit 230 of the communication terminal 200 determines whether or not the data obtained by demodulating the high band voice signal and the data obtained by demodulating the low band voice signal each satisfy predetermined quality.

  Then, the input unit 230 of the communication terminal 200 converts the voice signal into reception data using the data determined to satisfy the predetermined quality. Thereafter, the control unit 220 controls the input unit 230 to execute subsequent processing such as demapping. The order of the quality determination and the demapping of the demodulated data is not limited to the above processing, and the quality determination may be performed after the demapping.

  Here, the communication terminal 200 has been described as an example, but the information processing apparatus 100 also has the same configuration.

  As described above, according to this modification, even if part or all of the data can not be received correctly in one of the bands due to the frequency interference due to a decrease in the reception strength of the other band. The audio signal can be used to demodulate the data. Also, when there is no movement of the communication terminal 200 and there is no frequency interference, data can be demodulated using both bands. Therefore, it is possible to realize further speeding up of communication using voice as a medium according to the change of the communication environment.

  In this modification, when there is no movement of communication terminal 200 or the like and there is no disturbance in frequency, data is demodulated using the sound (first sound) of the first symbol, but the present invention It is not restricted to this. For example, if the sound of the first symbol is largely destroyed by impulse noise or the like, all data may be received using symbols included in the second and subsequent sounds.

  More specifically, before performing other signal processing, it is detected from the received signal strength whether or not the received so-called raw data contains impulse noise. For example, the received signal after A / D (analog / digital) conversion is temporarily stored and analyzed. When impulse noise is detected, a time zone in which the impulse noise is present is specified. For example, when impulse noise is present in the first sound, the first sound is ignored to determine whether analysis of the second sound is possible. With such a configuration, high noise immunity can be realized.

  Further, in the above embodiment, information is transmitted only once for each modulation scheme and frequency band, but the present invention is not limited to this. The same information may be transmitted twice or more in each modulation scheme and each frequency band. In this case, for example, after transmitting the first data, the second data may be transmitted after leaving a predetermined time.

  Alternatively, if the receiving side demodulates the first data and determines that the first transmission data has been correctly received, or if the data can be received only in the first half of the signal, that fact is notified to the transmitting side. In this case, the transmitting side may not transmit the second data or the second half data. In this case, the transmitter does not have to transmit the same data twice.

  Alternatively, if the reception signal strength at the time of receiving the first data is equal to or more than a predetermined value before performing demodulation processing, the reception side determines that the data has been correctly received, and notifies the transmission side to that effect. May be Alternatively, when it is determined that the data has been correctly received, demodulation processing or the like may not be performed on the data received for the second time without notifying the transmission side of the fact.

  In the above embodiment, the same data is redundantly transmitted using different modulation schemes, but the present invention is not limited to this. For example, the first data may be transmitted using a first modulation scheme, and second data different from the first data may be transmitted using a second modulation scheme.

  Communication terminal 200 in the above-mentioned embodiment can apply the above-mentioned art also to other devices provided with a speaker and a microphone, for example. For example, it is a portable music apparatus such as an MP3 player, an IC (Integrated Circuit) recorder, and a wearable terminal such as a wristwatch (however, each needs to have a speaker and a microphone). Also, a sound amplification device other than a speaker may be used to output sound, and a sound collection device other than a microphone may be used to input sound.

  In the above embodiment, an example in which voice used as a carrier is voice in an inaudible band has been described, but voice in an audible band may be used as a carrier. By using audio in the audible band as a carrier, the user can confirm the timing at which data is transmitted, so that the communication terminal 200 can be consciously stopped with respect to the settlement terminal 900.

  In the above embodiment, at the time of signal demodulation, communication terminal 200 determines whether data modulated using different modulation schemes and different frequency bands satisfy predetermined quality, and data meeting predetermined quality. Although only the signal is converted into received data using only the present invention, the present invention is not limited to this. For example, the reliability of communication is evaluated based on the strength of received signal, the presence or absence of data defect, etc., and the modulation method with higher communication reliability and the voice signal received in the frequency band are weighted to perform demodulation processing. It may be executed. The demodulation process may be performed by weighting based on communication reliability and calculating a weighted average of the weighted data.

  In the above embodiment, data to be modulated by BPSK is transmitted first by the second half group (D4 to D6) divided into two, and then transmitted to the first half group (D1 to D3) divided and modulated by FSK. Although data transmitted data D1-D6 without changing the order, the present invention is not limited to this. The data to be modulated by BPSK transmits data D1 to D6 without changing the order, and the data to be modulated by FSK transmits the second half of the divided second group (D4 to D6) first, and then the first divided half Groups (D1 to D3) may be transmitted.

  In the above embodiment, BPSK is used as PSK, but the present invention is not limited to this. For example, QPSK, DQPSK, DBPSK may be used as PSK. For example, in DQPSK, four waves shifted in phase in four stages are used, and different values are assigned to the differences from the previous waves. For this reason, in DQPSK, 4-value (2-bit) information can be expressed in one symbol section of one subcarrier.

  When DQPSK is used as PSK, FSK is a binary value in one symbol period, and DQPSK is a quaternary value in one symbol period, so that it is a combination of modulation schemes having different transmission rates. Using this, the data modulated by DQPSK may be divided into the first half and the second half, and if the first half of data modulated by DQPSK can be correctly received, the reception and demodulation thereafter may be stopped.

  In addition, when the above-described function is realized by sharing the OS (Operating System) with the application, or by cooperation between the OS and the application, etc., only the part other than the OS may be stored in the medium.

  It is also possible to superimpose a program on a carrier wave and distribute it via a communication network. For example, the program may be posted on a bulletin board (BBS, Bulletin Board System) on a communication network, and the program may be distributed via the network. Then, the program may be configured to be able to execute the above-described processing by starting up these programs and executing them as other application programs under the control of the operating system.

Reference Signs List 1 communication system 9 network 97, 98, 99 system bus 100 information processing apparatus 110 storage unit 111 program 120 control unit 121 one-time key generation unit 122 authentication processing unit 130 input unit 140 output unit 150 detection unit 160 communication unit 200 communication terminal 210 Storage unit 211 program 220 control unit 221 transmission data generation unit 230 input unit 240 output unit 300 point settlement server 310 storage unit 311 settlement processing program 312 user table 313 store table 320 control unit 330 communication unit 900 settlement terminal 999 store 1611 mapping circuit 1612 Subcarrier modulation circuit 1613 IFFT circuit 1614, 1621 Frequency conversion circuit 1622 FFT circuit 1623 Demodulation circuit 1624 Demapping circuit

Claims (6)

A communication system including a communication terminal owned by a user, a shop terminal installed in a shop, and a server communicably connected to the shop terminal via a network.
The communication terminal includes transmission means for transmitting transmission information, which is information to be transmitted, to the shop terminal by voice.
The shop terminal is
Receiving means for receiving the transmission information in voice from the communication terminal;
Demodulation information transmitting means for demodulating the transmission information received by the receiving means and transmitting the information to the server via the network;
The server is
Demodulation information receiving means for receiving the demodulated transmission information from the shop terminal;
Settlement processing means for performing settlement processing based on the transmission information received by the demodulation information reception means;
And a settlement result transmission unit that transmits the settlement result in the settlement processing unit to the shop terminal via the network.
The shop terminal further includes a settlement result reception display unit that receives and displays the settlement result from the server.
A communication system characterized by A communication terminal owned by the user, a shop terminal installed in the shop, a relay terminal relaying communication between the communication terminal and the shop terminal, and the shop terminal are communicably connected to each other via the network. A communication system including:
The communication terminal includes transmission means for transmitting transmission information, which is information to be transmitted, to the relay terminal by voice.
The relay terminal is
Receiving means for receiving transmission information in voice from the communication terminal;
And demodulation information transmitting means for demodulating the transmission information received by the receiving means and transmitting the demodulated information to the shop terminal through near field communication.
The shop terminal is
Demodulation information receiving means for receiving the demodulated transmission information;
Transmission information transmitting means for transmitting the transmission information received by the demodulation information receiving means to the server via the network;
The server is
Transmission information receiving means for receiving the transmission information from the shop terminal;
Settlement processing means for performing settlement processing based on the transmission information received by the transmission information reception means;
And a settlement result transmission unit that transmits the settlement result in the settlement processing unit to the shop terminal via the network.
The shop terminal further includes a settlement result reception display unit that receives and displays the settlement result from the server.
A communication system characterized by The shop terminal further includes a wireless transmission unit that transmits the settlement result received by the settlement result reception display unit to the relay terminal by near field communication.
The relay terminal further includes voice transmission means for receiving the settlement result from the shop terminal and transmitting the settlement result to the communication terminal by voice.
The communication terminal is
Voice receiving means for receiving the settlement result in voice from the relay terminal;
It further comprises demodulation display means for demodulating and displaying the settlement result received by the voice receiving means.
The communication system according to claim 2, characterized in that: The shop terminal further includes control signal transmitting means for transmitting a control signal for enabling the function of the receiving means by the relay terminal based on an operation by the user.
The relay terminal further includes notification means for notifying that the function of the receiving means has become effective when receiving the control signal transmitted from the shop terminal.
The communication system according to claim 2 or 3, characterized in that: A communication method by a communication system including a communication terminal owned by a user, a shop terminal installed in a shop, and a server communicably connected to the shop terminal via a network.
The communication terminal executes a transmission step of transmitting transmission information, which is information to be transmitted, to the shop terminal by voice.
The store terminal is
A receiving step of receiving the transmission information by voice from the communication terminal;
Performing a demodulation information transmission step of demodulating the transmission information received in the reception step and transmitting the information to the server via the network;
The server
A demodulation information receiving step of receiving the demodulated transmission information from the shop terminal;
A settlement processing step of performing settlement processing based on the transmission information received in the demodulation information reception step;
Executing a settlement result transmitting step of transmitting the settlement result in the settlement processing step to the store terminal via the network;
The shop terminal further executes a settlement result reception display step of receiving and displaying the settlement result from the server;
A communication method characterized by A program in a communication system including a communication terminal owned by a user, a shop terminal installed in a shop, and a server communicably connected to the shop terminal via a network.
Allowing the communication terminal to function as transmission means for transmitting transmission information, which is information to be transmitted, to the shop terminal by voice.
The store terminal,
Receiving means for receiving the transmission information by voice from the communication terminal;
The transmission information received by the reception unit is demodulated to function as a demodulation information transmission unit that transmits the information to the server via the network.
The server,
Demodulation information receiving means for receiving the demodulated transmission information from the shop terminal;
Settlement processing means for performing settlement processing based on the transmission information received by the demodulation information reception means;
Allowing a settlement result in the settlement processing means to function as a settlement result transmission means for transmitting the settlement result to the shop terminal via the network,
Allowing the shop terminal to further function as a settlement result reception display means for receiving and displaying the settlement result from the server,
A program characterized by

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