JP2016066878A - Communication system, communication state determination method, transmitting/receiving device, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication system, a communication state determination method, a transmitting/receiving device, and a program capable of easily determining communication state with a communication target at a terminal which has sent a transmission signal.SOLUTION: A first transmitting/receiving device generates a first transmission data signal by adding a first identification signal to a first data signal, transmits the generated data signal to a second transmitting/receiving device through a communication line, receives a second transmission data signal, sent through the communication line, as a first reception data signal, detects a second identification signal from the first reception data signal, and determines communication state between the first and the second transmitting/receiving devices according to the detected result. The second transmitting/receiving device receives the first transmission data signal, sent through the communication line, as a second reception data signal, detects the first identification signal from the second reception data, and if the first identification signal is detected, the second transmitting/receiving device generates the second transmission data signal by adding the second identification signal to a second data signal, and sends the generated data signal to the first transmitting/receiving device through the communication line.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a communication system for determining a communication state between two transmission / reception devices, a communication state determination method, each transmission / reception device used in the communication system, and a program for determining a communication state of the transmission / reception device.

  With the spread of smartphones, an increasing number of transmission / reception devices, that is, terminals, are used via an IP network such as the Internet using VoIP (Voice over Internet Protocol) or the like. However, in communication over an IP network, communication quality is likely to be impaired due to congestion or the like, so when such an event occurs during communication, it is required to notify the cause of the occurrence. It was.

  In order to cope with such a request, when communication quality deteriorates, the conventional technique, for example, the technique disclosed in Patent Document 1, measures at least one of delay, fluctuation, and data loss rate of a received packet, Based on the measurement result, the error rate of the communication packet is monitored and displayed to the user.

JP 2002-232475 A

  However, in such a conventional technique, it is determined that the communication is appropriate based on the received signal on the other terminal side that receives the transmission signal transmitted from one terminal, and the one terminal side It was not judged whether transmission and reception were appropriate. Therefore, there is a drawback that the user on one terminal side does not know whether the communication is properly performed.

  Accordingly, an object of the present invention is to provide a communication system, a communication state determination method, and transmission / reception that can easily determine whether or not a communication state with a communication partner terminal is appropriate in a terminal that has transmitted a transmission signal. An apparatus and a program are provided.

  In order to solve the above-described problem, according to the first aspect of the present invention, a communication system in which a first transmission / reception device and a second transmission / reception device are connected via a communication line, wherein the first transmission / reception device includes: First identification signal generating means for generating a first identification signal; first identification signal adding means for generating a first transmission data signal by adding a first identification signal to a first data signal to be transmitted; A first transmission means for transmitting one transmission data signal to the second transmission / reception device to the communication line; a first transmission data signal transmitted from the second transmission / reception device via the communication line; A first receiving means for outputting as a received data signal, a first identification signal detecting means for detecting a second identification signal from the first received data signal, and the first identification signal according to a detection result of the first identification signal detecting means. Transmission / reception device and second transmission / reception device Communication state determination means for determining a communication state between the first transmission / reception device and the second transmission / reception device receiving the first transmission data signal transmitted from the first transmission / reception device via the communication line. Second receiving means for outputting as a second received data signal; second identification signal detecting means for detecting the first identification signal from the second received data signal; and second identification signal generating means for generating the second identification signal. And generating the second transmission data signal by adding the second identification signal to the second data signal to be transmitted when the first identification signal is detected by the second identification signal detection means. There is provided a communication system comprising: an identification signal adding unit; and a second transmission unit for transmitting the second transmission data signal to the communication line toward the first transmission / reception device.

  In order to solve the above problem, according to a second aspect of the present invention, the first transmission / reception device and the second transmission / reception in a communication system in which the first transmission / reception device and the second transmission / reception device are connected via a communication line. A method for determining a state of communication with a device, wherein a first identification signal generating step for generating a first identification signal in the first transmitting / receiving device, and adding the first identification signal to a first data signal to be transmitted A first identification signal adding step for generating a first transmission data signal, a first transmission step for sending the first transmission data signal to the communication line toward the second transmission / reception device, and the second transmission / reception device. Receiving a second transmission data signal transmitted via the communication line from the first reception step for outputting the first transmission data signal as a first reception data signal; and a first identification for detecting a second identification signal from the first reception data signal And a communication state determination step for determining the communication state according to a detection result of the first identification signal detection step. In the second transmission / reception device, the communication line is connected from the first transmission / reception device. A second reception step of receiving the first transmission data signal transmitted via the second reception data signal and outputting it as a second reception data signal; a second identification signal detection step of detecting the first identification signal from the second reception data signal; When the first identification signal is detected by the second identification signal generation step for generating the second identification signal and the second identification signal detection step, the second identification signal is added to the second data signal to be transmitted. And a second identification signal adding step for generating the second transmission data signal and transmitting the second transmission data signal to the communication line toward the first transmitting / receiving device. Communication state determination method characterized by comprising a second transmission step, the for is provided.

  In order to solve the above problems, according to a third aspect of the present invention, the first transmission / reception device and the second transmission / reception in a communication system in which the first transmission / reception device and the second transmission / reception device are connected via a communication line. A communication state determination program for causing a transmission / reception device to execute a communication state determination with a device, wherein the first transmission / reception device generates a first identification signal, and the first transmission / reception device includes: Adding a first identification signal to the first data signal to be transmitted to generate a first transmission data signal; and wherein the first transmitting / receiving device converts the first transmission data signal to the first data signal. A first transmission step for sending to the communication line to the second transmission / reception device; and the first transmission / reception device receives a second transmission data signal sent from the second transmission / reception device via the communication line to the first transmission step. Receive A first reception step of outputting the data signal, a first identification signal detection step in which the first transmission / reception device detects a second identification signal from the first reception data signal, and the first transmission / reception device A communication state determination step for determining a communication state between the first transmission / reception device and the second transmission / reception device according to a detection result of one identification signal detection unit; and the second transmission / reception device from the first transmission / reception device. A second reception step of receiving the first transmission data signal transmitted via the communication line and outputting the first transmission data signal as a second reception data signal; and the second transmitting / receiving device configured to identify the first identification from the second reception data signal. A second identification signal detecting step for detecting a signal; a second identification signal generating step for generating a second identification signal by the second transmitting / receiving device; and a second identifying signal for the second transmitting / receiving device. A second identification signal adding step of generating the second transmission data signal by adding the second identification signal to the second data signal to be transmitted when the first identification signal is detected by the intelligence means; A second transmission / reception device executes a second transmission step of sending the second transmission data signal to the communication line toward the first transmission / reception device.

  In order to solve the above-described problem, according to a fourth aspect of the present invention, there is provided a transmission / reception apparatus connected to a communication line, including an identification signal generating means for generating a first identification signal, and a first data signal to be transmitted. An identification signal adding means for adding the first identification signal to generate a first transmission data signal; a transmission means for sending the first transmission data signal to the communication line toward a communication partner device; and the communication Receiving means for receiving a second transmission data signal sent from the counterpart transmission / reception device via the communication line and outputting it as a reception data signal; from the reception data signal to the transmission / reception device, the transmission / reception device and the communication counterpart An identification signal detecting means for detecting a second identification signal used for determining a communication state with the transmitting / receiving apparatus, and the transmitting / receiving apparatus and the Transceiver device is provided which comprises a communication state determining means for determining a communication state between the transmitting and receiving apparatus Shin partner.

  In order to solve the above problems, according to a fifth aspect of the present invention, there is provided a program for determining a communication state of a transmission / reception device connected to a communication line, wherein the identification signal generates a first identification signal to a computer. A generation step, an identification signal adding step for generating the first transmission data signal by adding the first identification signal to the first data signal to be transmitted, and communicating the first transmission data signal to the transmission means of the transceiver A transmission step for sending to the communication line of the other party to the communication line; and a reception means for receiving the second transmission data signal sent from the transmission / reception apparatus of the communication counterpart via the communication line to the receiving means of the transmission / reception apparatus. A reception step for outputting as a signal, an identification signal detection step for detecting a second identification signal from the received data signal, and a detection result of the identification signal detection step. Program the transceiver and the communication state determination step of determining a communication state of the transmission and reception device of the communication partner, characterized in that for the execution is provided in accordance with the.

  In order to solve the above-described problem, according to a sixth aspect of the present invention, a transmission / reception apparatus connected to a communication line receives a first transmission data signal sent from the communication partner's transmission / reception apparatus via the communication line. Receiving means for outputting as a first received data signal, identification signal detecting means for detecting a first identification signal from the first received data signal, identification signal generating means for generating a second identification signal, and the identification signal Identification signal adding means for generating the second transmission data signal by adding the second identification signal to the second data signal to be transmitted when the first identification signal is detected by the detection means; and the second And a transmission means for transmitting a transmission data signal to the communication line to the communication partner's transmission / reception apparatus.

  In order to solve the above-described problem, according to a seventh aspect of the present invention, there is provided a program for a communication state determination method for a transmission / reception device connected to a communication line, the computer having a communication partner connected to a reception unit of the transmission / reception device. Receiving step of receiving a first transmission data signal sent from the transmission / reception apparatus via the communication line and outputting it as a first reception data signal; and an identification signal detection for detecting a first identification signal from the first reception data signal A second identification signal generating step for generating a second identification signal; and when the first identification signal is detected by the identification signal detecting step, the second identification signal is added to the second data signal to be transmitted. An identification signal adding step for generating the second transmission data signal by adding the second transmission data signal to the transmission means of the transmission / reception apparatus; A program characterized by executing a transmitting step of sending to the communication line towards is provided.

  According to the present invention, when the first identification signal is detected from the received data signal in the second transmission / reception device that receives the transmission data signal including the first identification signal transmitted from the first transmission / reception device via the communication line, A transmission data signal including the second identification signal is transmitted to the first transmission / reception device via the communication line, and the first transmission / reception device determines whether or not the second identification signal is detected from the reception data signal. A communication state between the first transmission / reception device and the second transmission / reception device is determined. Therefore, it is possible to easily determine the communication state with the second transmission / reception device of the communication partner in the first transmission / reception device that has transmitted the transmission signal.

It is a block diagram which shows the communication system of Example 1 of this invention. FIG. 2 is a block diagram illustrating a configuration in one terminal in the system according to the first embodiment. FIG. 3 is a block diagram illustrating a configuration in the other terminal in the system according to the first embodiment. It is a wave form diagram which shows the signal interpolation conversion operation | movement of the pseudo data addition part in the system of Example 1. FIG. 3 is a flowchart illustrating an operation of an information determination unit in the system according to the first embodiment. It is a block diagram which shows the communication system of Example 2 of this invention. It is a block diagram which shows the structure in the terminal of Example 2. FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Example 1
FIG. 1 shows a communication system as a first embodiment of the present invention.

  This communication system includes two terminals, that is, a terminal (first transmission / reception device) 10 and a terminal (second transmission / reception device) 20. The terminal 10 and the terminal 20 are connected to a network 50 that is a communication line network. The terminal 10 and the terminal 20 can communicate with each other via the network 50. Of course, the number of terminals connected to the network 50 may be more than two.

  The terminal 10 includes a receiving unit 11 that is a receiving device and a transmitting unit 12 that is a transmitting device. Similarly, the terminal 20 includes a receiving unit 21 and a transmitting unit 22.

  As shown in FIG. 2, the reception unit 11 of the terminal 10 includes a reception unit 111, a decoding unit 112, an identification signal detection unit 113, a communication state determination unit 114, a pseudo data addition unit 115, a data storage device 116, a speaker device 117, And an information presentation unit 118.

  The receiving unit 111 is connected to the network 50, receives a signal from the network 50, and extracts encoded data S151 from the received signal.

  The decoding unit 112 is connected to the output of the receiving unit 111, decodes the encoded data S151, and outputs a received audio signal S152. The receiving unit 111 and the decoding unit 112 constitute a receiving unit.

  The identification signal detection unit 113 as the first identification signal detection unit is connected to the output of the decoding unit 112 and to the output of an identification signal generation unit 122 (described later) in the transmission unit 12, and the identification signal generation unit 122. Is determined based on the operation determination information J163 supplied from, and the determination result is output as the operation confirmation information J153.

  A communication state determination unit 114 serving as a communication state determination unit is connected to the output of the decoding unit 112 and the output of the identification signal detection unit 113, and based on the received audio signal S152 and the operation confirmation information J153, It is determined whether or not the communication state of communication performed between them is normal, and the determination result is output as communication state determination information J154.

  The pseudo data adding unit 115 as the first pseudo data adding means is connected to the output of the identification signal detecting unit 113 together with the output of the decoding unit 112, and performs signal interpolation on the received audio signal S152 based on the operation confirmation information J153. Conversion is performed to generate an output audio signal S155. The pseudo data adding unit 115 is connected to the data storage device 116 and stores the received audio signal S152 in the data storage device 116.

  The speaker device 117 is connected to the output of the pseudo data adding unit 115 and generates an acoustic output corresponding to the output audio signal S155.

  The information presentation unit 118 is connected to the output of the communication state determination unit 114, and presents the communication state determination information J154 by display, for example.

  Note that at least one of the speaker device 117 and the information presentation unit 118 may be externally connected without being included in the receiving unit 11.

  As illustrated in FIG. 2, the transmission unit 12 of the terminal 10 includes a microphone device 121, an identification signal generation unit 122, an identification signal addition unit 123, an encoding unit 124, and a transmission unit 125.

  The microphone device 121 converts the collected sound into an original audio signal S161 that is an electrical signal and outputs the converted signal. Note that the microphone device 121 may be externally connected without being included in the transmission unit 12.

  The identification signal generator 122 as the first identification signal generator generates an identification signal S162 (first identification signal) to be added to the original audio signal S161. In this embodiment, the identification signal S162 is a sine wave signal of 2000 Hz as will be described later. Further, the identification signal generation unit 122 outputs information included in the identification signal S162 as the operation determination information J163.

  The identification signal adding unit 123, which is a first identification signal adding unit, is connected to the output of the microphone device 121 and the output of the identification signal generating unit 122, and adds the identification signal S162 to the original audio signal S161 to transmit the transmission audio signal S164. Is generated.

  The encoding unit 124 is connected to the output of the identification signal adding unit 123, and encodes the transmission audio signal S164 to generate encoded data S165.

  The transmission unit 125 is connected to the output of the encoding unit 124 and is connected to the network 50, generates a packet including the encoded data S165, and sends the packet to the network 50. The encoding unit 124 and the transmission unit 125 constitute a first transmission unit.

  As shown in FIG. 3, the reception unit 21 of the terminal 20 includes a reception unit 211, a decoding unit 212, an identification signal detection unit 213, a pseudo data addition unit 214, a data storage device 215, and a speaker device 216.

  The receiving unit 211 is connected to the network 50, receives a signal from the network 50, extracts the encoded data S251 from the received signal, and outputs it.

  The decoding unit 212 is connected to the output of the receiving unit 211, decodes the encoded data S251, and outputs a received audio signal S252. The receiving unit 211 and the decoding unit 212 constitute a second receiving unit.

  The identification signal detection unit 213 serving as the second identification signal detection unit is connected to the output of the decoding unit 212, determines whether or not the identification signal is included in the received audio signal S252, and confirms the operation result of the determination. Output as information J253. The identification signal to be determined is the aforementioned identification signal S162.

  The pseudo data adding unit 214 as the second pseudo data adding means is connected to the output of the identification signal detecting unit 213 together with the output of the decoding unit 212, and performs signal interpolation on the received audio signal S252 based on the operation confirmation information J253. Conversion is performed to generate an output audio signal S254. The pseudo data adding unit 214 is connected to the data storage device 215 and stores the received audio signal S252 in the data storage device 215.

  The speaker device 216 is connected to the output of the pseudo data adding unit 214 and generates an acoustic output corresponding to the output audio signal S254. Note that the speaker device 216 may be externally connected without being included in the receiving unit 21.

  As shown in FIG. 3, the transmission unit 22 of the terminal 20 includes a microphone device 221, an identification signal extraction unit 222, an identification signal addition unit 223, an encoding unit 224, and a transmission unit 225.

  The microphone device 221 converts the collected sound into an original voice signal S261 that is an electrical signal and outputs the converted signal. Note that the microphone device 221 may be externally connected without being included in the transmission unit 22.

  The identification signal extraction unit 222, which is the second identification signal generation means, is connected to the output of the decoding unit 212 and the output of the identification signal detection unit 213 of the reception unit 21, and from the received audio signal S252 based on the operation confirmation information J253. An identification signal component to be added to the original audio signal S261 is extracted to generate an extracted identification signal S262 (second identification signal).

  The identification signal adding unit 223 as the second identification signal adding means is connected to the output of the microphone device 221 and the output of the identification signal extracting unit 222, and adds the extracted identification signal S262 to the original audio signal S261 to transmit the transmission audio signal. S263 is generated.

  The encoding unit 224 is connected to the output of the identification signal adding unit 223 and encodes the transmission voice signal S263 to generate encoded data S264.

  The transmission unit 225 is connected to the output of the encoding unit 224 and is connected to the network 50, generates a packet including the encoded data S264, and sends the packet to the network 50. The encoding unit 224 and the transmission unit 225 constitute a second transmission unit.

  Next, the operation of the above communication system will be described. In this operation, each of the terminal 10 and the terminal 20 performs signal processing in units of 10 ms audio frames.

  In the transmission unit 12 of the terminal 10, the original audio signal S 161 output from the microphone device 121 is supplied to the identification signal adding unit 123, and the identification signal adding unit 123 outputs the original audio signal S 161 from the identification signal generating unit 122. Identification signal S162 is added, and as a result, a transmission audio signal S164 is generated. The addition of the identification signal S162 will be described later. The transmission audio signal S164 is encoded by the encoding unit 124 and is supplied to the transmission unit 125 as encoded data S165. The encoded data S165 is packetized by the transmission unit 125 and sent to the network 50 toward the terminal 20.

  The identification signal S162 generated by the identification signal generator 122 is a 2000 Hz sine wave signal in this embodiment. In the present invention, the identification signal S162 is not limited to a sine wave signal of 2000 Hz. The identification signal S162 may be a signal having a frequency different from 2000 Hz, a signal having a waveform different from that of the sine wave signal, or a signal that is not an audio signal. A signal that is not an audio signal is, for example, an information signal such as a character or a code. That is, the identification signal S162 can be arbitrarily set as long as the signal is different from the original audio signal S161.

  The addition of the identification signal S162 to the original audio signal S161 by the identification signal adding unit 123 is performed periodically, for example, every 10 seconds, by measuring time by a timer not shown. The time measured by the timer is the additional interval (predetermined additional period) of the identification signal S162. The time measured by the timer, that is, the additional period is preset in the timer.

  The identification signal S162 is added to the original audio signal S161 by replacing a part of the original audio signal S161 with the identification signal S162. When signal processing is performed in units of 10 ms audio frames as in this embodiment, the original audio signal S161 is replaced with the identification signal S162 in the period from 2.5 ms to 7.5 ms at the time elapsed from the beginning of the processing unit. It is done. The signal from the beginning of the processing unit of the original audio signal S161 to the time when 2.5 ms elapses, and the signal from the time when 7.5 ms elapses to the end of the processing unit remain the original audio signal S161. Although it is desirable that the replacement part is not distributed to a plurality of packets after packetization, the length of the identification signal S162 to be replaced with the periodic interval of the periodic identification signal S162 by the above-mentioned timer is optimum depending on the terminal and network to be mounted. The value is different. Therefore, the timing for adding the identification signal to the original audio signal in the present invention is not limited to the timing for adding the identification signal S162 exemplified in this embodiment.

  In the terminal 20, the receiving unit 211 receives a packet sent from the terminal 10 via the network 50, and outputs encoded data S251. The encoded data S251 is decoded by the decoding unit 212 to be a reception voice signal S252, and is supplied to the identification signal detection unit 213 and the pseudo data addition unit 214.

  The identification signal detection unit 213 determines whether or not an identification signal is included in the received audio signal S252. As described above, since the identification signal is the 2000 Hz identification signal S162, if the identification signal detection unit 213 detects that a 2000 Hz component is included in the 10 ms audio frame, the identification signal S162 is included in the received audio signal S252. It is determined that it has been added. As a specific determination method, for example, a conventional frequency analysis method is used to compare the 2000 Hz signal component in the received audio signal S252 with the other frequency components in the audio frame, and there is a component difference of 50 dB or more. If this is detected, it can be determined that the received audio signal S252 includes the identification signal S162. However, the detection method of the identification signal S162 by the identification signal detection unit 213 is not limited to this method, and it is needless to say that other methods such as using a filter bank may be used.

  The operation confirmation information J253 output as a determination result from the identification signal detection unit 213 is a flag, which indicates 1 in the case of determination that the identification signal S162 is added to the reception audio signal S252, and is identified as the reception audio signal S252. In the case of determination that the signal S162 is not added, 0 is indicated. The operation confirmation information J253 is supplied to the pseudo data adding unit 214. However, the operation confirmation information J253 is not limited to a flag as long as it indicates the presence or absence of the identification signal S162.

  The pseudo data adding unit 214 performs signal interpolation conversion on the received audio signal S252 based on the operation confirmation information J253, and sequentially stores the received audio signal S252 in the data storage device 215.

  In the signal interpolation conversion, when the operation confirmation information J253 indicates 0 because the identification signal S162 is not added, the received audio signal S252 is directly used as the output audio signal S254 in the audio frame.

  Next, the signal interpolation conversion of the pseudo data adding unit 214 when the operation confirmation information J253 indicates 1 because the identification signal S162 is added will be described with reference to FIG. The operation of the pseudo data adding unit 214 is executed by digital processing of the voice signal and the identification signal. In FIG. 4, these signals are shown as analog signals for easy understanding.

  In FIG. 4, the received audio signal S252 of continuous audio frames fr01, fr02, fr03 is shown, and the identification signal S162 is included in the audio frame fr02. Since the audio signal fr01 does not include the identification signal S162, the received audio signal S252 is used as it is as the output audio signal S254.

  In the operation for the audio frame fr02, first, an audio signal up to a point when 2.5 ms has elapsed from the head of the audio frame fr02 is stored in the data storage device 215 as data. Thereafter, the basic period T0 is estimated from the latest sound data stored in the data storage device 215 by a known autocorrelation function, and the basic period is moved from the recorded end of the sound data stored in the data storage device 215 to the past side. The audio data for the period T0 is extracted as the interpolation candidate data DK. However, when the basic period T0 is smaller than the length of the identification signal in the audio frame + 1 ms (5 ms + 1 ms = 6 ms in this embodiment), the basic period T0 (3 ms in FIG. 4) is multiplied by an integer to 6 ms or more. After that, the interpolation candidate data DK is determined. After the determination of the interpolation candidate data DK, the audio data in the period of 1 ms from the earliest side of the period corresponding to the interpolation candidate data DK among the audio data stored in the data storage device 215 as the auxiliary data DH. Extracted.

When the operation check information J253 indicates 1, the output audio signal S254 output from the pseudo data adding unit 214 is the same signal as the received audio signal S252 in the period from the head of the audio frame fr02 to 1.5 ms. In a 1 ms period (fourth period) from 1.5 ms to 2.5 ms of the audio frame fr02, a signal obtained by superimposing the reception audio signal S252 and the auxiliary data DH of the audio frame fr02 is used as the output audio signal S254. That is, the elapsed time from 1.5 ms of the voice frame fr02 is t, the signal data s (t) at the time t of the received voice signal S252 of the voice frame fr02, the elapsed time from the head of the auxiliary data DH is τ, and the auxiliary data DH Assuming that the signal data d (τ) at the time τ, the output audio signal S254 is
s (t) · (1−t) / (2.5−1.5) + d (τ) · τ / (2.5−1.5)
It is represented by In the 5 ms period (fifth period) from 2.5 ms to 7.5 ms of the audio frame fr02, the signal of the period from the 1 ms elapse time to the 6 ms elapse time from the head of the interpolation candidate data DK is output audio signal S254. It is said. In a 1 ms period (sixth period) from 7.5 ms to 8.5 ms of the audio frame fr02, a signal obtained by superimposing the received audio signal S252 of the audio frame fr02 and the interpolation candidate data DK is set as the output audio signal S254. That is, the elapsed time from 7.5 ms of the voice frame fr02 is t, the signal data s (t) at the time t of the received voice signal S252 of the voice frame fr02, the elapsed time from the head of the interpolation candidate data DK is τ, and the interpolation candidate Assuming that the signal data d (τ) at the time τ of the data DK, the output audio signal S254 is
s (t) · (1-t) / (8.5-7.5) + d (τ) · (6-τ) / (6-5)
It is represented by In the period from 8.5 ms of the audio frame fr02 to 10 ms of the end of the frame fr02, the same signal as the received audio signal S252 becomes the output audio signal S254.

  In this way, an acoustic output is generated from the speaker device 216 in accordance with the output audio signal S254 output from the pseudo data adding unit 214.

  When the operation confirmation information J253 indicates 1, as described above, the identification signal S162 is included in the reception audio signal S252, so that the identification signal extraction unit 222 of the transmission unit 22 includes the operation confirmation information J253. Based on this, the component of the identification signal S162 is extracted from the received audio signal S252 to generate the extracted identification signal S262. In the extraction of the identification signal S162, the reception voice signal S252 for a period of 5 ms from the time when 2.5 ms elapses from the beginning of each voice frame to the time when 7.5 ms elapses is set as the extraction identification signal S262.

  The extracted identification signal S262 is supplied to the identification signal adding unit 223 and added to the original audio signal S261 from the microphone device 221. The addition of the extracted identification signal S262 to the original audio signal S261 by the identification signal adding unit 223 is performed in the same manner as the addition of the identification signal S162 to the original audio signal S161 by the identification signal adding unit 123 described above. That is, the period from 2.5 ms to 7.5 ms is replaced with the extracted identification signal S262 when the original audio signal S261 has elapsed from the beginning of the processing unit. The identification signal adding unit 223 generates a transmission voice signal S263 as a result of the replacement.

  The transmission voice signal S263 is encoded by the encoding unit 224 and supplied as encoded data S264 to the transmission unit 225. The encoded data S264 is packetized by the transmission unit 225 and sent to the network 50 toward the terminal 10. Is done.

  In the terminal 10, the reception unit 111 receives a packet transmitted from the terminal 20 via the network 50, and outputs received encoded data S151. The encoded data S151 is decoded by the decoding unit 112 and is supplied to the identification signal detection unit 113, the communication state determination unit 114, and the pseudo data addition unit 115 as a reception voice signal S152.

  The identification signal detection unit 113 determines whether or not the received audio signal S152 includes an identification signal component, that is, the extracted identification signal S262, based on the operation determination information J163 supplied from the identification signal generation unit 122. The determination operation of the identification signal detection unit 113 is the same as the determination operation of the identification signal detection unit 213 described above. Operation confirmation information J153 output as a determination result from the identification signal detection unit 113 is supplied to the communication state determination unit 114 and the pseudo data addition unit 115. The operation confirmation information J153 is a flag, which indicates 1 in the case of determination that the received identification signal S262 is included in the received audio signal S152, and in the case of determination that the extracted identification signal S262 is not included in the received audio signal S152. Indicates 0.

  The pseudo data adding unit 115 performs signal interpolation conversion on the received audio signal S152 based on the operation check information J153, and sequentially stores the received audio signal S152 in the data storage device 116. The operation including the signal interpolation conversion of the pseudo data adding unit 115 is the same as the operation of the pseudo data adding unit 214 described above. In the operation of the pseudo data adding unit 214 described above, the fourth period is the first period, the fifth period is the second period, and the sixth period is the third period. A sound output is generated from the speaker device 117 in accordance with the output audio signal S155 output from the pseudo data adding unit 115.

  The communication state determination unit 114 determines whether or not the communication state of communication performed between the terminal 10 and the terminal 20 is normal based on the received audio signal S152 and the operation confirmation information J153. In this determination operation, as shown in FIG. 5, the content of the operation confirmation information J153 is first determined (step S11). That is, it is determined whether or not the extracted identification signal S262 is included in the received audio signal S152 (whether the flag in the operation confirmation information J153 is 0 or 1). When the operation confirmation information J153 indicates 0 and the extraction identification signal S262 is not included, the communication state determination unit 114 determines that the communication state between the terminals 10 and 20 is abnormal (step S12). This abnormality is a lack of a transmission signal including at least an identification signal.

  On the other hand, when the operation identification information J153 indicates 1 and the extraction identification signal S262 is included, the communication state determination unit 114 determines whether or not the detection interval of the extraction identification signal S262 is more than twice the set time of the timer. Is determined (step S13). The set time of the timer is an additional interval of the identification signal S162. The communication state determination unit 114 determines that the communication state is abnormal within a set time of the timer, that is, more than twice the addition interval of the identification signal S162 (step S14). The abnormality in step S14 in which the detection interval of the extracted identification signal S262 becomes large indicates a case where the communication state between the terminals 10 and 20 deteriorates due to network transmission delay or fluctuation, and the incoming signal interval becomes large. If the detection interval of the extraction identification signal S262 is less than twice the set time of the timer, the communication state determination unit 114 determines that the communication state of communication performed between the terminal 10 and the terminal 20 is normal. (Step S15).

  Each determination result of steps S12, S14, and S15 is supplied to the information presentation unit 118 as communication state determination information J154, and is presented to the user of the terminal 10 by the information presentation unit 118. The presentation method may be any method as long as the user can visually recognize it. For example, a method of simply displaying either abnormal or normal on a display device, or in addition, transmission signal loss and transmission as abnormal The delay may be specifically indicated.

  As described above, in the communication system according to the first embodiment, the user of the terminal 10 determines whether or not the audio signal transmitted as a packet from the terminal 10 based on the content presented by the information presentation unit 118 has reached the terminal 20 normally. 10 to know. When the user is a maintenance person, it becomes easy to specify the cause of the communication state abnormality, and the maintenance cost can be reduced. In addition, since it is not necessary to transmit a dedicated packet for abnormality determination and communication state presentation, the network is not congested for abnormality determination and communication state presentation.

  In the first embodiment, the audio signal and the identification signal are digitally processed. However, it goes without saying that the processing unit may be determined and analog processing may be performed. Further, the present invention may be used in combination with a conventional function for detecting the communication state of the network.

  In addition, the decoding unit 112, the identification signal detection unit 113, the communication state determination unit 114, the pseudo data addition unit 115, the identification signal generation unit 122, and the identification signal addition unit of the transmission unit 12 according to the first embodiment described above. 123 and the encoding unit 124 are configured using one or more computers, the receiving unit 111 and the transmitting unit 125 can be controlled by a computer, and the above-described operation can be performed by causing the computer to execute software. May be. In addition, the reception unit 211, the decoding unit 212, the identification signal detection unit 213, and the pseudo data addition unit 214 of the reception unit 21, and the identification signal extraction unit 222, the identification signal addition unit 223, the encoding unit 224, and the transmission unit 22 The same applies to the transmission unit 225.

Example 2
FIG. 6 shows a communication system as a second embodiment of the present invention. The communication system according to the second embodiment includes terminals 30 and 40. The terminal 30 and the terminal 40 are connected to a network 50 that is a line network. The terminal 30 includes a reception unit 31 and a transmission unit 32, and the terminal 40 includes a reception unit 41 and a transmission unit 42. Since the terminal 30 and the terminal 40 have the same configuration, the configuration of the reception unit 31 and the transmission unit 32 of the terminal 30 will be described below.

  As shown in FIG. 7, the reception unit 31 includes a reception unit 111, a decoding unit 112, an identification signal detection unit 313, a communication state determination unit 114, a pseudo data addition unit 115, a data storage device 116, a speaker device 117, and information presentation. Part 118 is included. The reception unit 111, the decoding unit 112, the pseudo data addition unit 115, the data storage device 116, the speaker device 117, and the information presentation unit 118 are the same as those indicated by the same reference numerals in the reception unit 11 of the terminal 10 shown in FIG. It has the function of

  The transmission unit 32 includes a microphone device 121, an identification signal generation unit 322, an identification signal addition unit 123, an encoding unit 124, and a transmission unit 125. The microphone device 121, the identification signal adding unit 123, the encoding unit 124, and the transmission unit 125 have the same functions as those indicated by the same reference numerals in the transmission unit 12 of the terminal 10 shown in FIG.

  Further, the terminal 30 includes an incoming call detection unit 340 separately from the reception unit 31 and the transmission unit 32. The incoming call detection unit 340 acquires call control information J331 and call start information J332 from a call control processing unit (not shown) in the terminal 30, and outputs incoming call detection information J333 based on these information.

  The identification signal generation unit 322 of the transmission unit 32 is connected to each of the identification signal detection unit 313 and the incoming call detection unit 340, and is identified based on the incoming call detection information J333 and the transmission side additional information J334 from the identification signal detection unit 313. It is determined whether or not the signal S162 should be generated, and when it is determined that the signal S162 should be generated, the identification signal S162 is generated.

  The identification signal detection unit 313 of the reception unit 31 is connected to the identification signal generation unit 322 and the incoming call detection unit 340, respectively. The identification signal detection unit 313 determines whether or not an identification signal component that is an identification signal is included in the received audio signal S152 based on the operation determination information J163 supplied from the identification signal generation unit 322, and the determination result is The operation confirmation information J153 is output, and the identification signal is detected based on the incoming call detection information J333. When the additional information on the transmission side is acquired, the transmission side additional information J334 is generated to generate the identification signal generation unit. 322 is notified.

  Next, the operation of the communication system according to the second embodiment will be described focusing on the identification signal detection unit 313, the identification signal generation unit 322, and the incoming call detection unit 340.

  First, when the terminal 30 makes a call, the incoming call detection unit 340 acquires from the call control information J331 that the terminal 30 has made a call. The call control information J331 is information that becomes 1 when the terminal 30 receives an incoming call, -1 when the terminal 30 makes a call, and 0 when the terminal 30 is not in a call state. Also, when performing call control by SIP (Session Initiation Protocol), 1 when a SIP packet that is an INVITE request is received as a SIP message, -1 when a SIP packet that is an INVITE request is transmitted, and otherwise In this case, the information is 0.

  The incoming call detection unit 340 notifies the identification signal generation unit 322 of the incoming call detection information J333 based on the call control information J331. The incoming call detection information J333 is information in which 1 is set when there is an incoming call and 0 is set otherwise. When the terminal 30 transmits, the identification signal generation unit 322 is notified of 0, which is the other case. As a result, the identification signal generation unit 322 outputs the recognition signal S162 to the identification signal adding unit 123 when the incoming call detection information J333 indicates 0. The recognition signal S162 is a signal having a default value of 2000 Hz.

  Therefore, the transmission unit 32 generates a packet by the same operation as that of the transmission unit 12 of the first embodiment and sends it to the network 50.

  Next, when the terminal 30 receives an incoming call, the incoming call detection unit 340 acquires from the call control information J331 that the terminal 30 has received the incoming call. At the time of this incoming call, the call control information J331 becomes 1 indicating that the incoming call has been received as described above. Similarly, the incoming call detection information J333 generated from the incoming call detection unit 340 indicates 1.

  In the transmission unit 32, the identification signal generation unit 322 stops outputting the identification signal S162 according to the incoming call detection information J333 indicating 1 or outputs information such that the identification signal S162 becomes zero. The output stop of the identification signal S162 or the 0 information output of the identification signal S162 is continued until the start of the call is determined by the terminal 30 according to the call start information J332.

  In the reception unit 31, the identification signal detection unit 313 determines whether or not the reception voice signal S222 includes an identification signal having a default value of 2000 Hz according to the incoming call detection information J333 indicating 1, and adds the determination result to the transmission side. Output as information J334.

  When the identification signal is detected by the identification signal detector 313, the identification signal generator 322 is notified that the identification signal is detected by the transmission side additional information J334. The transmission side additional information J334 is a signal indicating 1 when a 2000 Hz identification signal is detected, and indicating 0 otherwise.

  If the incoming signal detection information J333 is 1 and the outgoing side additional information J334 is 1 when receiving an incoming call, the identification signal generator 322 has a frequency different from the default value of 2000 Hz as the recognition signal S162. A sine wave signal is generated. This different frequency is set to 3000 Hz in the present embodiment, but can be arbitrarily set as long as it can be discriminated from a predetermined value of 2000 Hz. The frequency of the identification signal S162 is output to the identification signal detection unit 313 by the operation determination information J163, and the identification signal detection unit 313 has a frequency of 3000 Hz of the recognition signal S162 according to the operation determination information J163 even if it is an incoming terminal. Identification can be made.

  In addition, you may change the aspects of other signals, such as a signal waveform, not only changing the signal frequency of identification signal S162.

  Since the incoming call terminal performs voice processing after receiving an incoming call, the identification signal on the called terminal side can be set to be different from that of the calling terminal, and it can be confirmed that a normal call can be made on both terminals. It becomes possible.

  As described above, since the terminal 30 and the terminal 40 have the same configuration, the operation is performed on the terminal 40 as described above. Below, each part in the receiving unit 41 and the transmission unit 42 is demonstrated using the same code | symbol as each part in the receiving unit 31 and the transmission unit 32. FIG.

  When the terminal 30 becomes the calling terminal when communicating between the terminal 30 and the terminal 40, the terminal 40 becomes the receiving terminal, and conversely, when the terminal 40 becomes the calling terminal, the terminal 30 Becomes the receiving terminal.

  The operation of each terminal when the terminal 30 is a calling terminal and the terminal 40 is a receiving terminal will be described. In the terminal 30, the identification signal generation unit 322 outputs the 2000 Hz recognition signal S162 to the identification signal addition unit 123 because the incoming call detection information J333 indicates 0. When a call is started, the identification signal adding unit 123 adds a 2000 Hz identification signal S162 to the original voice signal S161 at intervals of 10 seconds, and as a result, a transmission voice signal S164 is generated. The transmission audio signal S164 is encoded by the encoding unit 124 and supplied to the transmission unit 125 as encoded data S165. The encoded data S165 is packetized by the transmission unit 125 and sent to the network 50 toward the terminal 40.

  On the other hand, in the incoming side terminal 40, the incoming call detection information J333 output from the incoming call detection unit 340 by the incoming call from the terminal 30 indicates 1. Therefore, the identification signal generator 322 stops generating the recognition information S162. Thereafter, when the reception unit 111 receives a packet transmitted from the terminal 30 via the network 50, the reception audio signal S152 output from the reception unit 111 is decoded by the decoding unit 112 to be a reception audio signal S152. The reception audio signal S152 is supplied to the identification signal detection unit 313, the communication state determination unit 114, and the pseudo data addition unit 115. The identification signal detection unit 313 of the receiving terminal 40 determines whether or not an identification signal having a default value of 2000 Hz is included in the received voice signal S152. When the identification signal detection unit 313 obtains a determination result including an identification signal having a default value of 2000 Hz, the transmission side additional information J334 indicating 1 is output. Further, the operation confirmation information J153 output as the determination result from the identification signal detection unit 313 is supplied to the communication state determination unit 114 and the pseudo data addition unit 115.

  When the incoming signal detection information J333 indicating 1 is supplied, the identification signal generation unit 322 of the terminal 40 generates a 3000 Hz signal as the recognition signal S162. Therefore, when a call is started, in the terminal 40, the identification signal adding unit 123 adds an identification signal S162 of 3000 Hz to the original audio signal S161 at intervals of 10 seconds, and as a result, the transmission audio signal S164. Is generated. The transmission audio signal S164 is encoded by the encoding unit 124 to become encoded data S165, and is supplied to the transmission unit 125. The encoded data S165 is packetized by the transmission unit 125 and sent to the network 50 toward the terminal 30.

  When the receiving unit 111 receives a packet sent from the terminal 40 via the network 50, the transmitting side terminal 30 receives the received audio signal S152 output from the receiving unit 111 by the decoding unit 112 and receives the received audio signal. S152. The reception audio signal S152 is supplied to the identification signal detection unit 313, the communication state determination unit 114, and the pseudo data addition unit 115. The identification signal detection unit 313 of the transmission side terminal 30 determines whether or not a 3000 Hz identification signal is included in the received audio signal S152. The operation confirmation information J153 output as a determination result from the identification signal detection unit 313 is supplied to the communication state determination unit 114 and the pseudo data addition unit 115.

  The operations of the communication state determination unit 114 and the pseudo data addition unit 115 of the transmission side terminal 30 and the reception side terminal 40 are the same as those described in the first embodiment, and the description thereof is omitted here.

  As described above, in the second embodiment, whether the communication state of communication performed between the terminal 30 and the terminal 40 is normal with the identification signal added being different in each of the originating terminal 30 and the receiving terminal 40. It is possible to determine whether or not and present the result.

  In addition, the decoding unit 112, the identification signal detection unit 313, the communication state determination unit 114, the pseudo data addition unit 115, and the identification signal generation unit 322 and the identification signal addition unit of the transmission unit 32 according to the second embodiment described above. 123 and the encoding unit 124 are configured using one or more computers, the receiving unit 111 and the transmitting unit 125 can be controlled by a computer, and the above-described operation can be performed by causing the computer to execute software. May be.

  The identification signal generation unit 322 according to the second embodiment described above may extract the identification signal detected by the identification signal detection unit 313 from the received audio signal S152, and output the extracted identification signal as S162. That is, the pseudo data to be given from the calling side terminal to the receiving side terminal is a 2000 Hz sine wave, the pseudo data to be given from the receiving side terminal to the calling side terminal is a 3000 Hz sine wave, and the given data is not fixed depending on the direction of the signal. The signal to which the pseudo data of 2000 Hz as in the first embodiment is added and the signal to which the pseudo data of 3000 Hz is added may be transmitted and received. For example, when the identification signal detection unit 313 of the receiving terminal 40 includes an identification signal with a default value of 2000 Hz in the received voice signal S152, the identification signal generation unit 322 includes the identification signal with the transmission side additional information J334. After being output, a 2000 Hz sine wave is output as the identification signal S162, and then a 3000 Hz sine wave is output. Therefore, the transmission audio signal S164 output from the identification signal adding unit 123 generates an audio frame including an identification signal of 2000 Hz and an audio frame including an identification signal of 3000 Hz. Thereafter, when the received audio signal S152 includes an identification signal of 3000 Hz, the operation check information J153 notifies the communication state determination unit 114 of the determination result. The identification signal detection unit 313 of the transmission side terminal 30 is operated in the same manner as the identification signal detection unit 313 of the reception side terminal 40 by replacing 3000 Hz with 2000 Hz and 2000 Hz with 3000 Hz.

  In each of the first and second embodiments described above, each terminal has a telephone function and is configured to transmit and receive voice data for a call via a network in packets. Is not limited to audio data, but may be other data such as image data and character data.

  In each of the first and second embodiments, the communication line, that is, the network is formed by a wire. However, in the present invention, the apparatuses may be connected by a wireless network.

10, 20, 30, 40 Transmission / reception device 50 Network 11, 21, 31, 41 Reception unit 12, 22, 32, 42 Transmission unit 111, 211 Reception unit 112, 212 Decoding unit 113, 213, 313 Identification signal detection unit 114 Communication State determination unit 115, 214 Pseudo data addition unit 117, 216 Speaker device 121, 221 Microphone device 122, 322 Identification signal generation unit 123, 223 Identification signal addition unit 124, 224 Encoding unit 125, 225 Transmission unit 340 Incoming detection unit

Claims (21)

A communication system in which a first transmission / reception device and a second transmission / reception device are connected via a communication line,
The first transmitting / receiving device includes:
First identification signal generating means for generating a first identification signal;
First identification signal adding means for generating a first transmission data signal by adding the first identification signal to a first data signal to be transmitted;
First transmission means for transmitting the first transmission data signal to the communication line toward the second transmission / reception device;
First receiving means for receiving a second transmission data signal sent from the second transmission / reception device via the communication line and outputting it as a first reception data signal;
First identification signal detection means for detecting a second identification signal from the first received data signal;
Communication state determination means for determining a communication state between the first transmission / reception device and the second transmission / reception device according to a detection result of the first identification signal detection unit;
The second transmission / reception device includes:
Second receiving means for receiving the first transmission data signal transmitted from the first transmission / reception device via the communication line and outputting it as a second reception data signal;
Second identification signal detection means for detecting the first identification signal from the second received data signal;
Second identification signal generating means for generating the second identification signal;
A second identification signal for generating the second transmission data signal by adding the second identification signal to the second data signal to be transmitted when the first identification signal is detected by the second identification signal detection means; Additional means;
And a second transmission means for transmitting the second transmission data signal to the communication line toward the first transmission / reception device. The addition of the first identification signal to the first data signal by the first identification signal adding means is performed at a predetermined addition period.
The addition of the second identification signal to the second data signal by the second identification signal adding means is performed in the predetermined addition period.
The communication system according to claim 1. The first transmission / reception device detects a portion other than the second identification signal of the first reception data signal when the second identification signal is detected from the first reception data signal by the first identification signal detection unit. Generating a first pseudo data signal corresponding to the second identification signal portion, adding the first pseudo data signal to the second identification signal portion of the first received data signal, and First pseudo data adding means for
When the first identification signal is detected from the second received data signal by the second identification signal detection means, the second transmission / reception device starts from the portion other than the first identification signal of the second received data signal. A second pseudo data signal corresponding to the first identification signal portion is generated, and the second pseudo data signal is added to the first identification signal portion of the second reception data signal to obtain the second reception data signal. The communication system according to claim 1, further comprising second pseudo data adding means. The first pseudo data adding means includes a first data storage device for storing the first received data signal,
A portion of the first received data signal that is longer than the basic period of the first received data signal and longer than the time length of the second identified signal from the past portion in time from the start time of the second identification signal. A first interpolation data signal is extracted from the storage device, and the first reception data signal and the first interpolation data signal are superimposed in a first period before the start time of the second identification signal of the first reception data signal. The second period from the start point to the end point of the second identification signal is replaced with the first interpolated data signal, and the first received data signal and the first period in the third period after the end point of the second identification signal. Adding the first pseudo data signal by superimposing one interpolated data signal;
The second pseudo data adding means includes a second data storage device for storing the second received data signal,
A portion of the second received data signal that is longer than the basic period of the second received data signal and longer than the time length of the first identified signal from the past time point as the second interpolated data signal from the beginning of the first identified signal. Extracting and superimposing the second received data signal and the second interpolated data signal in a fourth period before the start time of the first identification signal of the second received data signal, from the start time of the first identification signal By replacing the fifth period up to the end point with the second interpolation data signal and superimposing the second received data signal and the second interpolation data signal in the sixth period after the end point of the first identification signal The communication system according to claim 3, wherein the second pseudo data signal is added.   The communication status determination means determines whether the communication status is normal based on the detection result of the second identification signal by the first identification signal detection means and the detection interval of the second identification signal by the first identification signal detection means. The communication system according to claim 1, wherein it is determined whether or not.   The second identification signal generation unit extracts the first identification signal when the second identification signal detection unit detects the first identification signal, and extracts the extracted first identification signal as the second identification signal. The communication system according to claim 1, wherein the communication system outputs the identification signal.   The second identification signal generation unit generates the second identification signal as a signal having a signal form different from that of the first identification signal when the first identification signal is detected by the second identification signal detection unit. The communication system according to claim 1.   The communication system according to claim 7, wherein the signal mode is a signal frequency, and the first identification signal and the second identification signal have different frequencies.   The communication system according to any one of claims 1 to 8, wherein the first data signal and the second data signal are audio signals.   The communication system according to claim 1, wherein the first transmission / reception device includes an information presentation unit that presents information on a determination result of the communication state determination unit. The second transmission / reception device includes:
Further comprising an incoming call detecting means for detecting an incoming call from the first transmitting / receiving device;
The second identification signal generation means stops generating the first identification signal during a period until the first data signal is generated when an incoming call is detected by the incoming call detection means. The transmission / reception apparatus according to claim 1.   The second identification signal generating means differs from the first identification signal when the second identification signal detecting means detects the first identification signal after the incoming call detecting means detects the incoming call. The communication system according to claim 11, wherein two identification signals are added to the second data signal. A communication state determination method between the first transmission / reception device and the second transmission / reception device in a communication system in which a first transmission / reception device and a second transmission / reception device are connected via a communication line,
In the first transmission / reception device,
A first identification signal generating step for generating a first identification signal;
A first identification signal adding step for generating a first transmission data signal by adding the first identification signal to a first data signal to be transmitted;
A first transmission step of sending the first transmission data signal to the communication line toward the second transmission / reception device;
A first reception step of receiving a second transmission data signal transmitted from the second transmission / reception device via the communication line and outputting it as a first reception data signal;
A first identification signal detecting step of detecting a second identification signal from the first received data signal;
A communication state determination step of determining the communication state according to a detection result of the first identification signal detection step,
In the second transceiver,
A second reception step of receiving the first transmission data signal transmitted from the first transmission / reception device via the communication line and outputting the first transmission data signal as a second reception data signal;
A second identification signal detection step of detecting the first identification signal from the second received data signal;
A second identification signal generating step for generating the second identification signal;
A second identification signal for generating the second transmission data signal by adding the second identification signal to the second data signal to be transmitted when the first identification signal is detected by the second identification signal detection step; Additional steps;
A second transmission step of transmitting the second transmission data signal to the communication line toward the first transmission / reception device. Communication state determination for causing a transmission / reception device to execute a communication state determination between the first transmission / reception device and the second transmission / reception device in a communication system in which the first transmission / reception device and the second transmission / reception device are connected via a communication line. A program,
A first identification signal generating step in which the first transmission / reception device generates a first identification signal;
A first identification signal adding step in which the first transmission / reception device generates a first transmission data signal by adding a first identification signal to a first data signal to be transmitted;
A first transmission step in which the first transmission / reception device sends the first transmission data signal to the communication line toward the second transmission / reception device;
A first reception step in which the first transmission / reception device receives a second transmission data signal transmitted from the second transmission / reception device via the communication line and outputs the second transmission data signal as a first reception data signal;
A first identification signal detecting step in which the first transmission / reception device detects a second identification signal from the first received data signal;
A communication state determination step in which the first transmission / reception device determines a communication state between the first transmission / reception device and the second transmission / reception device according to a detection result of the first identification signal detection unit;
A second reception step in which the second transmission / reception device receives the first transmission data signal transmitted from the first transmission / reception device via the communication line and outputs the first transmission data signal as a second reception data signal;
A second identification signal detection step in which the second transmission / reception device detects the first identification signal from the second received data signal;
A second identification signal generating step in which the second transmitting / receiving device generates the second identification signal;
When the second identification signal detection means detects the first identification signal, the second transmission / reception device adds the second identification signal to the second data signal to be transmitted and the second transmission data signal A second identification signal adding step for generating
A second transmission step in which the second transmission / reception device sends the second transmission data signal to the communication line toward the first transmission / reception device;
A communication state determination program characterized in that A transmission / reception device connected to a communication line,
Identification signal generating means for generating a first identification signal;
Identification signal adding means for generating the first transmission data signal by adding the first identification signal to the first data signal to be transmitted;
A transmission means for transmitting the first transmission data signal to the communication line toward a transmission / reception device of a communication partner;
Receiving means for receiving a second transmission data signal sent from the transceiver device of the communication partner via the communication line and outputting it as a received data signal;
Identification signal detection means for detecting a second identification signal used for determining a communication state between the transmission / reception device and the communication partner's transmission / reception device from the received data signal,
A transmission / reception apparatus comprising: communication state determination means for determining a communication state between the transmission / reception apparatus and the communication partner's transmission / reception apparatus in accordance with a detection result of the identification signal detection means. The transmission / reception device includes:
Having an incoming call detection means for detecting an incoming call from the transceiver device of the communication partner,
The said identification signal production | generation means stops the production | generation of the said 1st identification signal in the period until the said 1st data signal is produced | generated when the said incoming call detection means detects an incoming call. 15. The transmission / reception device according to 15.   The identification signal adding means extracts the second identification signal when the identification signal detecting means detects the second identification signal, and uses the extracted second identification signal as the first identification signal. The transmission / reception apparatus according to claim 15 or 16, characterized by being added to the first data signal. A program for determining a communication state of a transmission / reception device connected to a communication line,
On the computer,
An identification signal generating step for generating a first identification signal;
An identification signal adding step of generating the first transmission data signal by adding the first identification signal to the first data signal to be transmitted;
A transmission step of causing the transmission means of the transmission / reception device to transmit the first transmission data signal to the communication line of the communication partner;
A receiving step of causing the receiving means of the transmitting / receiving device to receive a second transmission data signal transmitted from the transmitting / receiving device of the communication partner via the communication line and to output as a received data signal;
An identification signal detection step of detecting a second identification signal from the received data signal;
A program for executing a communication state determination step for determining a communication state between the transmission / reception apparatus and the communication partner transmission / reception apparatus in accordance with a detection result of the identification signal detection step. A transmission / reception device connected to a communication line,
Receiving means for receiving a first transmission data signal transmitted from the transmission / reception apparatus of a communication partner via the communication line and outputting the first transmission data signal;
Identification signal detecting means for detecting a first identification signal from the first received data signal;
Identification signal generating means for generating a second identification signal;
Identification signal adding means for generating the second transmission data signal by adding the second identification signal to the second data signal to be transmitted when the first identification signal is detected by the identification signal detection means;
Transmitting / receiving apparatus, comprising: a transmission means for transmitting the second transmission data signal to the communication line toward the communication partner's transmission / reception apparatus.   The identification signal generation unit extracts the first identification signal when the identification signal detection unit detects the first identification signal, and outputs the extracted first identification signal as the second identification signal. The transmitting / receiving apparatus according to claim 19. A program for a communication state determination method of a transmission / reception device connected to a communication line,
On the computer,
A receiving step of causing the receiving means of the transmitting / receiving device to receive a first transmission data signal transmitted from the transmitting / receiving device of the communication partner via the communication line, and to output the first transmission data signal;
An identification signal detection step of detecting a first identification signal from the first received data signal;
A second identification signal generating step for generating a second identification signal;
An identification signal adding step of generating the second transmission data signal by adding the second identification signal to a second data signal to be transmitted when the first identification signal is detected by the identification signal detection step;
And a transmission step of causing the transmission means of the transmission / reception apparatus to send the second transmission data signal to the communication line toward the communication partner's transmission / reception apparatus.

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