JP2003244111A - Signal sending and receiving method, and device and program to operate its method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a signal sending and receiving method which transmits a time difference signal to compensate for a time synchronism of the signal when the signal is sent and received by using a terminal connected to a network without existence of a reference clock and to provide a device and a program to operate this method. <P>SOLUTION: In the signal sending and receiving method which reproduces a signal received from a reference terminal by decoding it and transmits a signal generated synchronizing the reproduction by taking it in and encoding it, when the signal generated synchronizing the reproduction is taken in, the sending and receiving method which takes the reproduced reproduction signal in at the same time, compares the signal obtained by decoding it with the reproduction signal taken in at the same time as the signal generated synchronizing the reproduction, determines the time difference between both the signals and transmits the time difference by encoding it is provided. The device and the program to operate this method are provided. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal transmitting / receiving method, an apparatus for implementing this method, and a program,
The present invention relates to a signal transmission / reception method for compensating the time synchronization of a signal when transmitting / receiving a signal using a terminal connected to a network having no reference clock, a device for implementing this method, and a program.

[0002]

2. Description of the Related Art Signals generated at a plurality of points are collected via a network, and signals that are important in time sequence and continuity, such as audio signals and moving image signals, are synthesized and reproduced after establishing time synchronization with each other. In this case, conventionally, a reference clock flowing in the network is used. That is, all signal transmitting terminals generate and transmit signals using the reference clock,
The signal receiving terminal uses the reference clock to combine the signals. According to this method, since all terminals involved in signal transmission / reception operate under the control of the same reference clock, it was easy to establish time synchronization.

On the other hand, in an IP network using Ethernet (registered trademark), there is no reference clock in the network. If an audio signal, a temporal sequence such as a moving image signal, or a signal whose continuity is important is transmitted and received on an IP network without this reference clock, RT
There is a method of using P and RTSP. RTP and RT
Regarding SP, refer to the document “Mastering TCP / IP I
P Multicast Edition ", Ohmsha (1999) and other documents. However, these methods only compensate for the temporal integrity of the packets transmitted in the network. Regarding what kind of signal is included in a packet, RTP and RTSP are not covered by the compensation, and it is impossible to establish time synchronization between the signals included in the packet.

[0004]

SUMMARY OF THE INVENTION The present invention is directed to a signal transmitting / receiving method for compensating the time synchronization of signals when transmitting / receiving a signal using a terminal connected to a network having no reference clock, and an apparatus for implementing this method. , To provide a program.

[0005]

In a signal transmission method for decoding and reproducing a signal received from a reference terminal, and for capturing and encoding a signal generated in synchronization with the reproduction, the signal is transmitted in synchronization with the reproduction. When a signal to be reproduced is captured, the reproduced signal is simultaneously captured and decoded, and the signal generated in synchronism with the reproduction is compared with the captured signal simultaneously, and the time difference between these two signals is compared. Was measured and the time difference was encoded and transmitted. Then, in the signal transmitting method, the signal obtained by the decoding is stored, the reproduction signal taken in at the same time as the signal generated in synchronization with the reproduction is stored, and the cross-correlation function between the two stored signals is stored. A signal transmission method was constructed in which the correlation delay was calculated by changing the correlation delay and the correlation delay giving the maximum cross-correlation function was taken as the time difference between the two signals. In the signal transmission method, the signal obtained by the decoding is band-passed, the reproduction signal taken in at the same time as the signal generated in synchronization with the reproduction is band-passed, and the time difference between the two signals passed the band is obtained. The signal transmission method for calculating

Further, in the signal transmitting method, the signal obtained by the decoding is subjected to frequency analysis to find the frequency having the strongest power, and the signal obtained by the decoding is set with the vicinity of the frequency having the strongest power as the center frequency. A reproduction signal that is band-passed and taken in at the same time as the signal that is generated in synchronization with the reproduction is band-passed with the vicinity of the frequency with the strongest power as a center frequency, and the time difference between the band-passed signals is calculated. The signal transmission method was configured. Then, the signal received from the reference terminal is decoded and reproduced, the signal generated in synchronization with the reproduction is taken in, the encoded transmission signal is received and encoded, and the signal obtained by decoding is synchronized with the reproduction. The generated signal is compared with the reproduced signal taken in at the same time, the encoded time difference signal obtained by encoding the time difference between the obtained signals is received, and further the encoded reference terminal transmission signal is received from the reference terminal. Then, the coded transmission signal is decoded to generate a decoded transmission signal, the coded reference terminal transmission signal is decoded to generate a decoded reference terminal transmission signal, and the coded time difference signal is decoded to obtain a time difference. A signal receiving method is configured to generate a signal and synthesize and reproduce the decoded transmission signal and the decoded reference terminal transmission signal by compensating the time difference between the two signals with the time difference signal.

In the signal receiving method, the coded transmission signal and the coded reference terminal transmission signal are decoded and stored, and the stored decoded transmission signal and the decoded reference terminal transmission signal are divided by the time difference signal. A signal receiving method for shifting and combining is constructed. Here, a signal decoding unit 11 that decodes the signal received from the reference terminal, a signal reproducing unit 12 that reproduces the decoded signal, a transmission signal acquisition unit 22 that acquires a signal that is generated in synchronization with the reproduction, a acquisition In a signal transmission device having a coding unit 51 for coding the generated transmission signal, a reception signal acquisition unit 2 that simultaneously acquires the reproduction signal when the signal generated in synchronization with the reproduction is acquired.
1, a signal obtained by decoding and a reproduced signal which is simultaneously acquired with a signal generated in synchronization with the reproduction are compared with each other to measure a time difference between the two signals. And a signal transmission apparatus including an inter-signal time difference coding unit 41 for coding the time difference.

Further, the signal received from the reference terminal is decoded and reproduced, the signal generated in synchronization with the reproduction is taken in, the encoded transmission signal is received and encoded, and the signal obtained by decoding and the reproduction The signal generated in synchronism with the received signal is compared with the reproduced signal taken in at the same time, and the encoded time difference signal obtained by encoding the time difference between the obtained signals is received, and further transmitted from the reference terminal to the encoded reference terminal. A signal receiving apparatus for receiving a signal comprises a signal decoding unit 11 for decoding the coded transmission signal, and a signal decoding unit 11 for decoding the coding reference terminal transmission signal, A time difference information decoding unit 42 for decoding the time difference signal is provided, and the output of the signal decoding unit 11 and the output of the time difference information decoding unit 42 are sent as a set, and are sent as a decoded transmission signal and a decoding reference terminal transmission. Belief Comprising a signal combining unit 13 for combining with decoded time difference information by shifting compensation bets, and the combined transmitted signal constitutes a signal receiving apparatus having a signal reproduction unit 12 for reproducing.

Here, the signal received from the reference terminal is decoded, the decoded signal is reproduced, the signal generated in synchronization with the reproduction is captured, the captured signal is encoded, and the signal is synchronized with the reproduction. When capturing the generated signal, the reproduced signal is simultaneously captured and decoded, and the reproduced signal that is simultaneously captured with the signal generated in synchronization with the reproduction is compared, and the time difference between these signals is measured. Then, the time difference is encoded, and an encoded transmission signal is output,
A signal transmission program for executing the output of the coded time difference signal was configured.

Further, the received signal is decoded and reproduced,
A signal obtained by decoding and receiving a coded transmission signal in which a signal generated in synchronization with the reproduction is captured and coded,
The signal generated in synchronization with the reproduction is compared with the reproduction signal taken in at the same time, the encoded time difference signal obtained by encoding the time difference between the obtained signals is received, and the encoded reference terminal transmission signal is received. Then, the coded transmission signal is decoded to generate a decoded transmission signal, the coded reference terminal transmission signal is decoded to generate a decoded reference terminal transmission signal, and the coded time difference signal is decoded to be decoded. An encoded time difference signal is generated, the decoded transmission signal and the decoded reference terminal transmission signal are combined by the decoding time difference signal by compensating for the time difference between the two signals, and the combined transmission signal is reproduced. The signal receiving program for executing

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A transmitting terminal, which is a terminal connected to a network and trying to transmit a signal, transmits a signal to which its own signal to be transmitted is synchronized with another terminal on the network prior to transmission. Is received from the reference terminal. Next, the transmitting terminal decodes the signal received from the reference terminal and reproduces it, and at the same time, takes in the signal to be transmitted generated in synchronization with this reproduced signal. At this time, the signals reproduced at the same time are taken in. Here, it is assumed that the signal generated in synchronization with the reproduction and the reproduced signal can be separated and the time synchronization is established.

The transmitting terminal compares the signal obtained by decoding with the regenerated signal that has been taken in and measures the time difference between these two signals. Here, since the reproduced signal is time-synchronized with the transmission signal, this measured time difference is also equal to the time difference between the decoded reception signal and the transmission signal. When the transmitting terminal encodes and transmits the transmitting signal, the transmitting terminal simultaneously transmits the measured time difference and the synchronization information which is the transmitting signal that uniquely determines the reference terminal. A playback terminal, which is a terminal that connects to a network and receives and plays back signals from multiple sending terminals or reference terminals, decodes each signal sent from the sending terminal, and further decodes using the synchronization information received at the same time. After the time synchronization between the converted signals is established, they are combined and reproduced.

As described above, when the reference clock does not exist in the network, the transmitting terminal selects the reference terminal, and the information on the time difference between the signal transmitted from the reference terminal and the signal to be transmitted by the transmitting terminal is transmitted. By transmitting together with this, the receiving terminal can compensate for the time synchronization between the plurality of signals and reproduce.

[0014]

Embodiments of the present invention will be described with reference to the embodiment of FIG. The received signal is input through the received signal input terminal 1, decoded by the signal decoding unit 11, reproduced by the signal reproducing unit 12, and output through the received signal reproducing terminal 2. Then, the signal to be transmitted is input through the transmission signal input terminal 3, is acquired by the transmission signal acquisition unit 22, is encoded by the signal encoding unit 51, and is output through the transmission signal output terminal 5.

Here, the reception signal acquisition unit 21 and the transmission signal acquisition unit 22 operate while maintaining time synchronization. That is, the time when the signal input to the reception signal acquisition unit 21 at a certain time T is output from the reception signal acquisition unit 21 is
When the delay time in the reception signal acquisition unit 21 is δ, T +
If δ, the signal input to the transmission signal acquisition unit 22 at time T is output from the transmission signal acquisition unit 22 at time T + δ. Since the signal reproduction unit 12, the reception signal acquisition unit 21, and the transmission signal acquisition unit 22 operate with a time delay, the output signal of the signal decoding unit 11 input to the inter-signal time difference measurement unit 31 and the reception signal acquisition unit 21. An output time difference occurs between the output signals of the. In general, a signal obtained by outputting the output of the signal decoding unit 11 via the signal reproducing unit 12 and the received signal acquiring unit 21 is delayed compared with the output of the signal decoding unit 11.

The inter-signal time difference measuring unit 31 assumes that the output signal of the signal decoding unit 11 is one input and causes the output signal of the signal decoding unit 11 to pass through the signal reproducing unit 12 and the received signal acquiring unit 21. The other input is obtained, and the delay of the correlation between these two inputs is measured, and the measured time difference is output. The output of the signal time difference measuring unit 31 is encoded by the signal time difference encoding unit 41 and output via the time difference information output terminal 4. To describe a modified example of the embodiment of FIG. 1, in the inter-signal time difference measuring unit 31, two input signals are temporarily stored and a cross-correlation function of these stored signals is calculated by changing the delay of correlation. Then, the delay of the correlation that maximizes the cross-correlation function is obtained, and this is used as the time difference between the signals.

Another embodiment will be described with reference to FIG. In FIG. 2, members common to those in FIG. 1 are given common reference numerals. The received signal is input through the received signal input terminal 1, decoded by the signal decoding unit 11, reproduced by the signal reproducing unit 12, and output through the received signal reproducing terminal 2. Then, the signal to be transmitted is input via the transmission signal input terminal 3, acquired by the transmission signal acquisition unit 22, encoded by the signal encoding unit 51, and output via the transmission signal output terminal 5.

Here, the reception signal acquisition unit 21 and the transmission signal acquisition unit 22 operate while maintaining time synchronization. That is, the time when the signal input to the reception signal acquisition unit 21 at a certain time T is output from the reception signal acquisition unit 21 is T
In the case of + δ, the signal input to the transmission signal acquisition unit 22 at time T is output from the transmission signal acquisition unit 22 at time T + δ. Since the signal reproduction unit 12, the received signal acquisition unit 21, and the signal filter unit 62 operate with a time delay, the output of the signal decoding unit 11 and the output of the received signal acquisition unit 21 that are input to the inter-signal time difference measurement unit 31 are output. Has an output time difference. Generally, for a signal obtained by outputting the output of the signal decoding unit 11 through the signal reproducing unit 12, the received signal acquiring unit 21, and the signal filtering unit 62, the output of the signal decoding unit 11 is converted into the signal filtering unit 62.
With a time delay compared to the signal obtained via

The inter-signal time difference measuring section 31 receives the output of the signal decoding section 11 as one input of the signal obtained through the first signal filtering section 61 and reproduces the output of the signal decoding section 11 as a signal. Unit 12, received signal acquisition unit 21, and second
The signal obtained via the signal filter unit 62 is used as the other input, the delay of the correlation between these two inputs is measured, and the measured time difference is output. The output of the signal time difference measuring unit 31 is coded by the signal time difference coding unit 41 and output via the time difference information output terminal 4. Here, the first signal filter unit 61 and the second signal filter unit 62 have the same characteristics. Then, the first signal filter unit 61
The characteristic of the second signal filter unit 62 is that the number of filtering bands is about 10 at a specific frequency, for example, 1 kHz.
It is preferable to use a bandpass filter having a narrow band of 0 Hz to several kHz, which is about 200 Hz compared to the signal frequency of 20 kHz.

To explain a modification of the other embodiment of FIG. 2,
In the inter-signal time difference measuring unit 31, two input signals are temporarily stored, a cross-correlation function of these stored signals is calculated by changing the delay of the correlation, and the delay of the correlation that maximizes the cross-correlation function is obtained. , Which is the time difference between the signals. Still another embodiment will be described with reference to FIG.
In FIG. 3, members that are the same as those in the previous embodiment are given the same reference numerals. The received signal is input through the received signal input terminal 1, decoded by the signal decoding unit 11, reproduced by the signal reproducing unit 12, and output through the received signal reproducing terminal 2. Then, the signal to be transmitted is input through the transmission signal input terminal 3, is acquired by the transmission signal acquisition unit 22, is encoded by the signal encoding unit 51, and is output through the transmission signal output terminal 5.

Here, the reception signal acquisition unit 21 and the transmission signal acquisition unit 22 operate while maintaining time synchronization. That is, the time when the signal input to the reception signal acquisition unit 21 at a certain time T is output from the reception signal acquisition unit 21 is T
In the case of + δ, the signal input to the transmission signal acquisition unit 22 at time T is output from the transmission signal acquisition unit 22 at time T + δ. The signal frequency analysis unit 73 frequency-analyzes the output of the signal decoding unit 11, and outputs the frequency with the strongest power.
The third signal filter unit 71 and the fourth signal filter unit 72 receive the output of the frequency with the strongest power and set the center frequency of band-pass filtering to a frequency near the output of the signal frequency analysis unit 73.

The inter-signal time difference measuring section 31 receives the output of the signal decoding section 11 as one input of the signal obtained through the third signal filtering section 71 and reproduces the output of the signal decoding section 11 as a signal. Unit 12, received signal acquisition unit 21, and fourth
The signal obtained via the signal filter unit 72 of (1) is used as the other input, the delay of the correlation between these two inputs is measured, and the measured time difference is output. The output of the signal time difference measuring unit 31 is output via the signal time difference encoding unit 41 and the time difference information output terminal 4. Here, the third signal filter unit 71 and the fourth signal filter unit 72 have the same characteristics at each time point when the signals to be compared are generated. Then, the third signal filter unit 71 and the fourth signal filter unit 7
The second characteristic is also the same as the first signal filter section 61 and the second signal
Similarly to the characteristic of the signal filter section 62, it is preferable to use a band pass filter having a narrow band compared to the frequency of the signal, which has a filtering band number of 100 Hz to several kHz centered on a specific frequency.

To explain a modification of still another embodiment of FIG. 3, in the inter-signal time difference measuring section 31, two input signals are temporarily stored and the cross-correlation function of these stored signals is correlated. The calculation is performed by changing the delay of, the delay of the correlation that maximizes the cross-correlation function is obtained, and this is used as the time difference between the signals. An embodiment of the receiving apparatus will be described with reference to FIG. In FIG. 4, members that are the same as the members in the previous embodiment are given the same reference numerals. An embodiment of this signal receiving apparatus is to decode and reproduce a signal received from a reference terminal, receive a coded transmission signal obtained by encoding a signal generated in synchronization with the reproduction, and obtain a signal obtained by decoding. , A signal generated at the same time as the signal generated in synchronism with the reproduction is compared with the reproduced signal, and an encoded time difference signal obtained by encoding the time difference between the obtained signals is received,
A signal receiving device for receiving a coded reference terminal transmission signal from a reference terminal, comprising a signal decoding unit 11 for decoding the coded transmission signal, and decoding the coded reference terminal transmission signal. A signal decoding unit 11 is provided, and a time difference information decoding unit 42 for decoding the coded time difference signal is provided, and the output of the signal decoding unit 11 and the output of the time difference information decoding unit 42 are sent as a set. And a signal reproduction unit 12 that reproduces the combined transmission signal by combining the decoded transmission signal and the decoded reference terminal transmission signal by performing shift compensation for the decoded time difference information and combining them. To do.

The coded reference terminal transmission signal transmitted from the reference terminal and the coded transmission signal transmitted from the transmission terminal are input via the respective reception signal input terminals 1 and sent to the signal decoding section 11 for decoding. Be converted. The time difference signals simultaneously transmitted by the transmitting terminal are input via the time difference information input terminal 6 and sent to the time difference information decoding unit 42. The output of each signal decoding unit 11 is paired with the output of the time difference information decoding unit 42 and sent to the signal synthesizing unit 13, and is synthesized after the time difference shift is performed to establish time synchronization. It is reproduced and output through the reception signal reproduction terminal 2.

To explain a modification of the embodiment of FIG. 4, FIG.
In the signal synthesizing unit 13 of, the output of each signal decoding unit 11 is temporarily stored, and the time difference is shifted by using each time difference information input as a set of these stored signals to establish time synchronization. It will be combined and output later. here,
The following program is configured as a transmission program of the signal transmission device. When decoding the signal received from the reference terminal, reproducing the decoded signal, capturing the signal generated in synchronization with the reproduction, encoding the captured signal, and capturing the signal generated in synchronization with the reproduction The reproduced signal is simultaneously captured, the signal obtained by decoding is compared with the reproduced signal which is simultaneously captured with the signal generated in synchronization with the reproduction, the time difference between these two signals is measured, and the time difference is calculated. A signal transmission program that executes encoding, outputs an encoded transmission signal, and outputs an encoded time difference signal.

Then, the following program is configured as a receiving program of the signal receiving device. A signal obtained by decoding and reproducing the received signal, receiving a coded transmission signal obtained by encoding the signal generated in synchronization with the reproduction, decoding the signal, and a signal generated in synchronization with the reproduction At the same time, it compares the read signals that have been captured, receives the encoded time difference signal that encodes the obtained time difference between the two signals, receives the encoded reference terminal transmission signal, and decodes the encoded transmission signal. To generate a decoded transmission signal, decode the coding reference terminal transmission signal to generate a decoding reference terminal transmission signal, decode the coding time difference signal to generate a decoding time difference signal, and decode the decoded time difference signal. And a decoding reference terminal transmission signal for compensating the time difference between the two signals with the decoding time difference signal, and synthesizing the signals to reproduce the synthesized transmission signals.

With respect to the above-mentioned signal transmitting / receiving apparatus, as an input signal, a sampling frequency: 44.1 kHz, a channel number: monaural, a format: linear PCM1
6 bits, sound source: Experiments were performed using percussion instruments, string instruments, and pop songs. That is, these signals are input from the reception signal input terminal 1. In this case, since the input signal is uncompressed, the signal decoding unit 11 outputs the input signal as it is. Usually, decoding corresponding to encoding is performed and a linear PCM is output. The 1st signal filter part 61 and the 2nd signal filter part 62 used the bandpass filter which has a 900-1100 Hz pass band. All of these are composed of software on a computer. Then, in the experiment, the input signal is stored in advance in the storage device HDD as the file A on the electronic computer. The signal reproduction unit 12 and the reception signal acquisition unit 21 use so-called sound cards equipped in an electronic computer, and the signal reproduction unit 12 and the reception signal acquisition unit 21 are cable-connected. Further, in the experiment, the reception signal reproducing terminal 2 and the transmission signal input terminal 3 are also directly connected to the cable. Similar to the signal encoding unit 51 and the signal decoding unit 11, the input signal is output as it is. The signal output from the transmission signal output terminal 5 is stored in the storage device HDD as the file B on the electronic computer.

The above experiment was carried out, the time difference between the two input signals was measured in the signal time difference measuring unit 31, and the measured time difference information was stored in the file B on the electronic computer together with the output of the transmission signal output terminal 5. After that, the signal of the file A is time-corrected using the time difference stored in the file B, and is saved as the file C. Here, the signals reproduced by the receiving terminal are the signal in the file B and the signal in the file C. As described above, the signal transmission / reception device of the present invention is configured with the electronic computer as a main constituent member. Then, the present invention can be implemented by installing a program downloaded from a storage medium such as a CD or downloaded via a communication line into this electronic computer.

[0029]

As described above, according to the present invention, when the delay in the correlation between the signal in the file B reproduced by the receiving terminal and the file C is confirmed under the experimental conditions described above, both signals are confirmed. Although the time error of is within 0.1 ms, the delay of the correlation between the signal in the file B and the file A, that is, the time difference when the time difference compensation of the present invention is not performed, is confirmed. It was 3 to 26 ms.
From this, the present invention can exert a sufficient effect when time synchronization is established for a plurality of signals and reproduction is performed.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an embodiment of a transmission device.

FIG. 2 is a diagram illustrating another embodiment of a transmission device.

FIG. 3 is a diagram for explaining still another embodiment of the transmission device.

FIG. 4 is a diagram illustrating an embodiment of a receiving device.

[Explanation of symbols]

1 reception signal input terminal 11 signal decoding section 12 signal reproduction section 13 signal synthesis section 2 reception signal reproduction terminal 21 reception signal acquisition section 22 transmission signal acquisition section 3 transmission signal input terminal 31 signal time difference measurement section 4 time difference information output terminal 41 Inter-signal time difference coding unit 42 Time difference information decoding unit 5 Transmission signal output terminal 51 Signal coding unit 6 Time difference information input terminal 61 First signal filter unit 62 Second signal filter unit 71 Third signal filter unit 72 4 signal filter unit 73 signal frequency analysis unit

Claims (10)

[Claims] 1. A signal transmitting method for decoding and reproducing a signal received from a reference terminal, capturing a signal generated in synchronization with the reproduction, encoding and transmitting the signal, and capturing a signal generated in synchronization with the reproduction. On the occasion,
A signal obtained by simultaneously capturing and decoding the reproduced signal that has been reproduced and a reproduced signal that was simultaneously acquired simultaneously with the signal generated in synchronization with the reproduction are compared, and the time difference between these two signals is measured. A signal transmitting method, characterized in that the signal is encoded and transmitted. 2. The signal transmitting method according to claim 1, wherein the signal obtained by the decoding is stored, a reproduction signal taken in at the same time as a signal generated in synchronization with the reproduction is stored, and stored. The signal transmission method is characterized in that the cross-correlation function between both signals is calculated by changing the correlation delay, and the correlation delay that gives the maximum cross-correlation function is the time difference between both signals. 3. The signal transmitting method according to claim 1, wherein the signal obtained by the decoding is band-passed, and the reproduction signal taken in at the same time as the signal generated in synchronization with the reproduction is band-passed, A time difference between both signals that have passed through the band is calculated. 4. The signal transmitting method according to claim 1, wherein the frequency of the signal obtained by the decoding is frequency-analyzed to obtain the frequency having the strongest power, and the signal obtained by the decoding has the strongest power. Bandpass with the vicinity of the frequency as the center frequency, the reproduction signal taken in at the same time as the signal generated in synchronization with the reproduction is bandpassed with the vicinity of the frequency with the strongest power as the center frequency, A method for transmitting a signal, comprising calculating a time difference between the two. 5. A signal obtained by decoding and reproducing a signal received from a reference terminal, receiving a signal generated in synchronization with the reproduction, receiving a coded transmission signal, decoding the signal, and reproducing the signal. The signal generated in synchronism with the received signal is compared with the reproduced signal taken in at the same time, and the encoded time difference signal obtained by encoding the time difference between the obtained signals is received, and further transmitted from the reference terminal to the encoded reference terminal. Receiving a signal, decoding the coded transmission signal to generate a decoded transmission signal, decoding the coded reference terminal transmission signal to generate a decoded reference terminal transmission signal, decoding the coded time difference signal A signal receiving method, comprising: generating a time difference signal to generate a time difference signal, and synthesizing and reproducing the decoded transmission signal and the decoding reference terminal transmission signal by compensating for a time difference between the signals with the time difference signal. 6. The signal receiving method according to claim 5, wherein the encoded transmission signal and the encoded reference terminal transmission signal are each decoded and stored, and the stored decoded transmission signal and decoding reference terminal are stored. A signal receiving method, wherein a transmission signal is shifted by the time difference signal and combined. 7. A signal decoding unit for decoding a signal received from a reference terminal, a signal reproducing unit for reproducing the decoded signal, a transmission signal acquiring unit for acquiring a signal generated in synchronization with the reproduction, and a signal acquiring unit. In a signal transmission device having an encoding unit that encodes the transmitted signal, when capturing a signal generated in synchronization with the reproduction,
The reception signal acquisition unit that simultaneously captures the reproduction signal is provided, and the signal obtained by decoding is compared with the reproduction signal that is captured simultaneously with the signal that is generated in synchronization with the reproduction, and the time difference between these signals is calculated. An inter-signal time difference measurement unit for measuring, and an inter-signal time difference encoding unit for encoding the time difference are provided. 8. A signal obtained by decoding and reproducing a signal received from a reference terminal, receiving a signal generated in synchronization with the reproduction, encoding a coded transmission signal, decoding the signal, and reproducing the signal. The signal generated at the same time as that of the reproduction signal captured at the same time is compared, and the encoded time difference signal obtained by encoding the time difference between the obtained signals is further received.
A signal receiving device for receiving a coded reference terminal transmission signal from a reference terminal, comprising a signal decoding section for decoding the coded transmission signal, and a signal decoding section for decoding the coded reference terminal transmission signal. And a time difference information decoding unit for decoding the coded time difference signal, wherein the output of the signal decoding unit and the output of the time difference information decoding unit are sent as a pair, and the decoded decoding transmission is performed. A signal synthesizing unit for synthesizing the signal and the decoded decoded reference terminal transmission signal by performing shift compensation for the decoded decoding time difference information and synthesizing, and a signal reproducing unit for reproducing the synthesized transmission signal A signal receiving device characterized by the above. 9. A signal received from a reference terminal is decoded, a decoded signal is reproduced, a signal generated in synchronization with reproduction is taken in, the acquired signal is encoded and generated in synchronization with the reproduction. When a signal to be read is taken in, the reproduced signal is taken in at the same time, the signal obtained by decoding is compared with the reproduced signal taken in at the same time as the signal generated in synchronization with the above-mentioned reproduction, and the time difference between these two signals is measured. A signal transmission program for executing the following: encoding the time difference, outputting an encoded transmission signal, and outputting an encoded time difference signal. 10. The received signal is decoded and reproduced,
The encoded transmission signal obtained by capturing and encoding the signal generated in synchronization with the reproduction is received, and the signal obtained by decoding is compared with the reproduction signal captured simultaneously with the signal generated in synchronization with the reproduction. Receiving a coded time difference signal obtained by coding a time difference between the two signals obtained, receiving a coded reference terminal transmission signal, decoding the coded transmission signal to generate a decoded transmission signal, and Decoding a coding reference terminal transmission signal to generate a decoding reference terminal transmission signal, decoding the coding time difference signal to generate a decoding time difference signal, the decoding transmission signal and the decoding reference terminal transmission signal A signal receiving program for executing the following, by compensating the time difference between the two signals with the decoded time difference signal and combining the signals, and reproducing the combined transmission signal.