JP2000151853A - Audio data / PB signal transmission / reception method - Google Patents

Abstract

(57) [Problem] To reliably transmit and receive a PB signal between voice data transmission devices while a voice call is being performed. SOLUTION: While packetized voice data is being transmitted from a voice data transmission device 3 to a partner device by a connectionless type protocol, the device 3 sends a PB to the partner device.
When a signal is transmitted, it is transmitted as code data as non-packetized audio data by a connection-type protocol, and a PB signal is reproduced at the other party based on the code data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reliably transmitting and receiving a PB signal between voice data transmitting apparatuses in order to enable various services using a PB signal while a voice call is being performed. The present invention relates to an audio data / PB signal transmission / reception method, and more particularly to an audio data / PB signal transmission / reception method in which a PB signal is transmitted / received in a mode different from packetized audio data.

[0002]

2. Description of the Related Art Generally, between conventional audio data transmission apparatuses, a transmission-side audio data transmission apparatus transmits packetized audio data to a reception-side audio data transmission apparatus via a transmission path in a state of being encoded and compressed. On the other hand, in the receiving-side voice data transmission device, packetized voice data received from a transmission path is decoded and expanded. At this time, as long as the call voice is transmitted and received as packetized voice data, the deterioration of voice data due to coding compression and the like and the voice data error during transmission are as follows.
Actually, there is no particular problem in reproducing the sound. This is because, due to the characteristics of the call voice, the voice data at the deteriorated or erroneous portion can be easily predicted from the continuity of the voice data and its context.

[0003]

However, in the same manner as in the case of a call voice, when only a PB signal as an audible sound or a call voice including a PB signal is transmitted and received between voice data transmission devices as packetized voice data. Is such that deterioration of audio data due to coding compression and audio data errors during transmission cannot be ignored. This is P
This is because the B signal itself does not have much continuity as a PB signal and does not have any context, so that it is easily affected by data loss or deterioration due to compression or the like. That is, up to now, the PB signal cannot be reliably transmitted and received between the voice data transmission devices, and therefore, the service improvement using the PB signal cannot be achieved.

[0004] It is an object of the present invention to provide a system in which voice data and PB signals can be reliably transmitted and received between voice data transmission devices so that various services using PB signals can be reliably performed while voice communication is being performed. A method for transmitting and receiving signals.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to transmit a PB signal from each voice data transmission device to a counterpart voice data transmission device while packetized voice data is being bidirectionally communicated between the voice data transmission devices. In doing so,
The PB signal is transmitted as code data, and the other party's voice data transmission device achieves this by reproducing the PB signal based on the code data. More specifically, the PB signal is transmitted from each of the voice data transmission apparatuses to the other party's voice data transmission apparatus while the packetized voice data uses a connectionless protocol and passes in both directions between the voice data transmission apparatuses. The transmission is achieved by using a connection-type protocol, transmitting the PB signal as code data, and reproducing the PB signal based on the code data in the other party's voice data transmission device.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, an audio data transmission apparatus according to the present invention will be described. FIG. 1 shows an example of a data exchange network including the audio data transmission apparatus. As shown, assuming that a subscriber calls a voice response device (not shown) on the network 8 from the telephone 1 to receive a voice response service, for example,
The telephone 1 and the voice response device include an exchange 2, a (transmission side) voice data transmission device 3,... (Omitted), a (reception side) voice data transmission device (not shown), and an exchange (not shown, (Accommodating a voice response device).

A general data transmission / reception operation between these audio data devices will be described below. That is, the call voice from the telephone 1 (including the PB signal)
Is input to the voice data transmission device 3 via the exchange 2 as an analog voice signal or a PCM signal (usually 8 kHz sampling, 8-bit data). For a call voice that does not exist, the voice data transmission device 3 sends a connectionless protocol (for example, UDP: User Datagram Protocol) as encoded and compressed packetized voice data.
ocol), and with respect to only the PB signal, the PB signal is transmitted as code data to the (reception side) voice data transmission device by a connection-type protocol (eg, TCP: Transmission Control Protocol). is there. For convenience of explanation, FIG.
The packetized voice data and the code data are transmitted from the voice data transmission device 3 on physically different transmission paths, but are physically transmitted on the same transmission path. Thereafter, each of the packetized voice data is received by the voice data transmission device via various paths, and the code data is received via a predetermined path. Such a situation is generally the same in the opposite direction, that is, when packetized voice data and code data are transmitted from the (reception side) voice data transmission apparatus to the voice data transmission apparatus 3.

Here, the operation of the voice data transmission device 3 will be described. The speech voice (including the PB signal) from the telephone 1 is input to the voice data transmission device 3 as an analog voice signal or a PCM signal. However, in the voice data transmission device 3, the analog voice signal is voice / PB
As a state converted into a PCM signal by the signal transmitting / receiving unit 4,
Further, the PCM signal passes through the audio / PB signal receiving section 4 as it is and is subjected to predetermined filtering processing by the audio / PB signal identifying section 5, respectively. While no PB signal can be detected by the filtering process,
The call voice is transmitted from the UDP conversion unit 7 on the transmission path as packetized voice data encoded and compressed.
When the PB signal is detected by the filtering process, the code data indicating the PB signal is inserted between the packetized voice data,
Is transmitted on the transmission path from As described above, since the PB signal is transmitted by TCP which is excellent in terms of an error detection / recovery function, the (reception side) voice data transmission device is more reliable than the case of transmission by UDP. A PB signal can be received.
(Reception side) When the PB signal is reproduced as audio data based on the code data in the audio data transmission device, the PB signal is packetized for a certain period of time before and after the reproduction so that the reproduction is prioritized over the packetized audio data. The audio data is discarded. This is because, when the audio data including the PB signal is discarded on the receiving side, the packetized audio data including only the PB signal is newly reproduced at the time of reproducing the PB signal. The data may be inserted between the packetized voice data in a state where the data is replaced with the discarded data.

Finally, the operation of transmitting the audio data / PB signal in the audio data transmission device and the operation of receiving the audio data / PB signal in the audio data transmission device, including the meaning of confirmation, will be described below. . That is, first, the operation of transmitting the audio data / PB signal in the receiving-side audio data transmitting apparatus will be described. As shown in FIG. 2, the transmitting-side audio data transmitting apparatus transmits the audio data or the PB signal during the call state. Are input continuously, and the type is continuously identified (processes 21 and 22). If the type is identified as a PB signal, it is determined that the PB signal has been received, and the communication protocol is a normal UD signal.
With the state changed from P to TCP, the PB signal is to be transmitted to the receiving-side voice data transmission device by TCP as PB signal data (code data) (processes 23 to 25). Also, if the type is P
If it is determined that the signal is not a B signal, it is determined that audio data has been received, and the audio data is transmitted as packetized audio data by the normal transmission method, that is, UDP (processes 26 and 27). ).

Next, the operation of receiving the voice data / PB signal in the receiving voice data transmitting apparatus will be described. As shown in FIG. Are generally received discontinuously, and their types are sequentially identified (processes 31 and 32). If a UDP packet is received, the data is to be transmitted to the receiving exchange as voice data (process 36). Also, if a TCP packet is received and its data is PB
If the packetized voice data is identified as signal data (code data), the packetized voice data already received by UDP is discarded for a certain time before and after that, and the PB signal data received by TCP is given priority. After being reproduced as a PB signal, the audio data discarded portion is transmitted to the receiving exchange with the reproduced PB signal inserted as audio data (processes 33 to 35).

The voice data / PB signal transmission / reception method according to the present invention will be described in more general terms. The modes of the method include whether or not a coding method, a connection type protocol method, and the like. Various modes can be considered depending on various combinations of these methods, whether or not the method is a packet discarding method before and after a received PB signal, and whether or not a PB signal compression method. Incidentally, each of the above methods will be briefly described as follows.

Coding method: When a PB signal from a telephone is input to a voice data transmission device via an exchange, and is identified as a PB signal by a "voice / PB signal identification unit", a The PB signal is transmitted in a coded state, while the other party's voice data transmission apparatus selects a signal corresponding to the reception code from a group of PB signals registered in advance and sends it to the other party's exchange. It was made.

Connection-type protocol method: Similar to the above-mentioned coding method, the PB signal from the telephone is "voice / PB".
If the signal is identified as a PB signal by the signal identification section, the PB signal (its format is code data, original audio data including the PB signal, or PCM data)
Is transmitted to the other party's voice data transmission device without fail.
The connection type protocol having the retransmission control function is used, and the PB signal is transmitted to the other party's voice data transmission device. This is because if a connectionless protocol is used, if a packet loss occurs between voice data transmission devices, it is no longer possible to support a PB signal service.

A method of discarding packets before and after a received PB signal: When a PB signal code data is received by a receiving voice data transmission device, an original voice packet including a PB signal and voices positioned before and after the voice packet are received. The packet is discarded, and a PB signal corresponding to the received code is inserted as a voice packet instead. With this method, double transmission of the PB signal is suppressed.

[0015] PB signal compression method: indicates that the audio data transmission apparatus has an encoding compression function for a PB signal (the format is PCM data).

[0016]

As described above, in each of the first to fifth aspects, in order to reliably enable various services using the PB signal while a voice call is being made,
The B signal can be reliably transmitted and received between the audio data transmission devices.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a data exchange network including a voice data transmission device according to the present invention;

FIG. 2 is a diagram showing an operation flow of audio data / PB signal transmission in the audio data device according to the present invention.

FIG. 3 is a diagram showing an audio data / PB signal receiving operation flow in the audio data device according to the present invention;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Telephone, 2 ... Exchange, 3 ... Voice data transmission device,
4 voice / PB signal transmission / reception section, 5 voice / PB signal identification section, 6 TCP conversion section, 7 UDP conversion section, 8 network

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K028 EE05 KK32 MM12 MM13 5K030 HA08 HB18 HC01 JA01 JT01 LA07 LB18 LB19 5K101 NN07 NN15 SS01 SS08 UU03 UU19 UU20

Claims (5)

[Claims] 1. A voice data / PB signal between voice data transmission devices for reliably transmitting and receiving a PB signal so that various services using the PB signal can be reliably performed while a voice call is being performed. In a transmission / reception method, when packetized voice data is bidirectionally communicated between voice data transmission devices, when a PB signal is transmitted from each of the voice data transmission devices to a partner voice data transmission device, the PB signal is transmitted. An audio data / PB signal transmission / reception method in which a signal is transmitted as code data and a PB signal is reproduced on the other party's audio data transmission device based on the code data. 2. A voice data / PB signal between voice data transmission apparatuses for reliably transmitting and receiving a PB signal so that various services using the PB signal can be reliably performed while a voice call is being performed. In the transmission / reception method, each of the voice data transmission devices transmits the encoded and compressed voice data to the other party's voice data transmission device as a packetized state, and the packetized voice from the other party's voice data transmission device. When the PB signal is transmitted from each of the voice data transmission devices to the other party's voice data transmission device in a state where the data is decoded and decompressed, the PB signal is transmitted as code data and the other party's voice data transmission device is transmitted. Then, an audio data / PB signal transmission / reception method in which a PB signal is reproduced based on the code data. 3. A voice data / PB signal between voice data transmission devices for reliably transmitting and receiving a PB signal so that various services based on the PB signal can be reliably performed while a voice call is being performed. In a transmission / reception method, a PB signal is transmitted from each of the voice data transmission devices to a partner voice data transmission device in a state where packetized voice data is bidirectionally communicated between the voice data transmission devices using a connectionless protocol. In this case, the PB signal is transmitted using a connection-type protocol, and the other party's voice data transmission apparatus reproduces the PB signal. 4. A voice data / PB signal between voice data transmission apparatuses for reliably transmitting and receiving a PB signal so that various services using the PB signal can be reliably performed while a voice call is being performed. In a transmission / reception method, a PB signal is transmitted from each of the voice data transmission devices to a partner voice data transmission device in a state where packetized voice data is bidirectionally communicated between the voice data transmission devices using a connectionless protocol. In this case, the PB signal is transmitted as code data by a connection-type protocol, and the other party's voice data transmission apparatus reproduces the PB signal based on the code data. 5. A voice data / PB signal between voice data transmission apparatuses for reliably transmitting and receiving a PB signal so that various services using the PB signal can be reliably performed while a voice call is being performed. In a transmission / reception method, a PB signal is transmitted from each of the voice data transmission devices to a partner voice data transmission device in a state where packetized voice data is bidirectionally communicated between the voice data transmission devices using a connectionless protocol. In this case, the PB signal is transmitted as code data by a connectionless protocol, while when the other party's audio data transmission apparatus reproduces the PB signal as audio data based on the code data, the PB signal is transmitted as packetized audio data. In order to give priority, packetized audio data is An audio data / PB signal transmission / reception method in which the PB signal is discarded and then reproduced as audio data.