JP2621768B2 - Detour method of voice compression transmission equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice compression transmission apparatus, and more particularly, to a method of bypassing a voice compression transmission apparatus when a bypass communication network does not guarantee multiframe synchronization.

[0002]

2. Description of the Related Art Conventionally, various audio compression transmission apparatuses have been proposed. For example, Japanese Patent Application Laid-Open No. 63-314037 discloses a synchronization system for a voice compression transmission device. According to this publication, on the transmitting side, a frame synchronization bit is added for each voice parameter, and further, when out-of-sync is detected on the receiving side, as an alternative to the silent voice parameter,
Synchronization information was sent to establish resynchronization.

[0003] Japanese Patent Application Laid-Open No. 60-62764 discloses a bypass method of a voice compression transmission device. According to this publication, even if the transmission data is transmitted a predetermined number of times, if the loop is not returned after looping through the loop, it is determined that the loop is abnormal, and switching to the bypass transmission path is performed.

[0004]

In the above-described synchronization method of the conventional audio compression transmission apparatus, since a synchronization bit is provided for each audio parameter, the transmission efficiency for actual data deteriorates. For example, in Japanese Patent Application Laid-Open No. 63-314037, if the voice parameter is 6 bits, the transmission efficiency is 75%.

In the conventional detour system of the voice compression transmission apparatus, a network of the same type as the normal transmission line is presumed as the detour transmission line, and if the synchronization types of the transmission lines are different, detour is impossible. .

An object of the present invention is to provide a method of bypassing a voice compression transmission apparatus that enables data communication even when the bypass communication network does not guarantee intra-network multiframe synchronization.

[0007]

According to the present invention, there is provided a detour method for a voice compression transmission apparatus according to the present invention. After a voice signal is digitally coded on a transmission side, asynchronous data is inserted when no sound is transmitted, and transmission data is transmitted to a reception side. In a voice compression transmission device that performs silence correction based on received data to improve transmission efficiency, a detour that ensures transmission quality stability by diverting transmission data to a detour communication network when a normal communication network fails.
In the method , when the alternate communication network is a communication network that does not guarantee intra-frame multi-frame synchronization, the transmitting side inserts a multi-frame synchronization bit inside the transmission data and transmits when detouring to the alternate communication network, On the receiving side, multi-frame synchronization processing corresponding to the multi-frame synchronization bit is performed to establish multi-frame synchronization.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

Referring to FIG. 1, an audio compression transmission apparatus 10 according to an embodiment of the present invention includes an audio data internal bus 11.
An asynchronous data internal bus 12, a normal communication network 13,
It is connected to the detour communication network 14. The normal communication network 13 is a communication network that guarantees intra-frame multi-frame synchronization, and the bypass communication network 14 is a communication network that does not guarantee intra-network multi-frame synchronization.

[0010] The voice compression transmission device 10 has a transmission unit 20, a reception unit 30, and a control unit 40. The transmission unit 20 includes a silence compression unit 21, an asynchronous transmission data interface unit 22, a transmission data generation unit 23, a multi-frame synchronization bit generation unit 24, a normal / detour switching unit 25, a normal transmission buffer 26, And a detour-time transmission buffer 27. The receiving unit 30 includes a normal reception buffer 31, a bypass reception buffer 32, a normal / detour coupling unit 33, a reception data generation unit 34, a multi-frame synchronization timing detection unit 35, a silence correction unit 36, and an asynchronous And a reception data interface unit 37. The control unit 40 includes a bypass register 41.

First, the transmission unit 2 of the audio compression transmission apparatus 10
The transmission operation at 0 will be described. The silence compressor 21 connected to the audio data internal bus 11 generates audio / non-speech identification bits and audio encoded data from the audio data input from the audio data internal bus 11. The asynchronous transmission data interface unit 22 connected to the asynchronous data internal bus 12 serializes the asynchronous data input from the asynchronous data internal bus 12 and outputs the serialized data. The transmission data generation unit 23 is connected to the silence compression unit 21 and the asynchronous transmission data interface unit 22. The transmission data generator 23 monitors the sound / silence discrimination bit, and
When the silence identification bit indicates silence, the serialized asynchronous data supplied from the asynchronous transmission data interface unit 22 is inserted into the silence data position to create normal-time transmission data. FIG. 2A shows an example of a frame format of normal transmission data. This shows an example where the normal communication network 13 is a high-speed digital line having a data rate of 1.5 Mbps.

It is assumed that a fault has occurred in the normal communication network 13.
In this case, the multi-frame synchronization bit is supplied from the multi-frame synchronization bit generation unit 24 to the transmission data generation unit 23 according to the instruction of the bypass register 41 of the control unit 40,
The transmission data generation unit 23 inserts a multi-frame synchronization bit into the normal transmission data to generate bypass transmission data. FIG. 2B shows an example of a frame format of transmission data at the time of detour.

The transmission data (normal transmission data or detour transmission data) generated by the transmission data generation unit 23 is supplied to the normal / detour switching unit 25. Normal / Detour switching unit 2
5 distributes transmission data to the normal-time transmission buffer 26 and the bypass-time transmission buffer 27 in accordance with an instruction indicating normal / bypass from the bypass register 41. Normal transmission buffer 2
6 is transmitted to the normal communication network 13 and the bypass transmission data stored in the bypass transmission buffer 27 is transmitted to the bypass communication network 14.

Next, the receiving unit 30 of the audio compression transmission apparatus 10
Will be described. The normal reception buffer 31 connected to the normal communication network 13
Is stored as normal-time reception data. On the other hand, the detour-time receiving buffer 32 connected to the detour communication network 14 stores the detour-time transmission data transmitted from the detour communication network 14 as the detour-time reception data.

The normal / detour coupling unit 33 is connected to the normal reception buffer 31 and the detour reception buffer 32.
The normal / detour coupling unit 33 combines the normal reception data output from the normal reception buffer 31 with the detour reception data output from the detour reception buffer 32, and supplies the reception data to the reception data generation unit. I do. Further, the normal / detour coupling unit 33 extracts a multi-frame synchronization bit from the received data at the time of detour, and sends out the extracted multi-frame synchronization bit to the multi-frame synchronization timing detection unit 35. In response to the extracted multi-frame synchronization bit, the multi-frame synchronization timing detection unit 35 establishes multi-frame synchronization and supplies a synchronization timing detection signal to the reception data generation unit 34.

Based on the synchronization timing detection signal, the reception data generator 34 supplies the reception data excluding the multi-frame synchronization bit to the silence corrector 36 and the asynchronous reception data interface 37. The silence corrector 36 performs silence correction of the received data based on the sound / silence discrimination bit in the received data, and converts the audio data to the audio data internal bus 11.
Transfer to Similarly, the asynchronous reception data interface unit 37 extracts asynchronous data from the reception data based on the sound / non-speech discrimination bit in the reception data, and transfers the extracted asynchronous data to the asynchronous data internal bus 12.

As is clear from the above description of the embodiment,
The voice compression transmission device 10 can perform data communication via the bypass communication network 14 that does not guarantee intra-network multi-frame synchronization.

Although the present invention has been described with reference to the embodiment, the present invention is not limited to the embodiment, and it is needless to say that various changes / modifications can be made without departing from the spirit of the present invention. .

[0019]

As described above, according to the present invention, when the alternate communication network does not guarantee multi-frame synchronization within the network, the transmitting side inserts a multi-frame synchronization bit into transmission data and the receiving side performs multi-frame synchronization. Since multi-frame synchronization can be established based on the frame synchronization bit, data communication can be performed by a bypass communication network that does not guarantee intra-network multi-frame synchronization.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a voice compression transmission apparatus to which a bypass method according to an embodiment of the present invention is applied.

FIG. 2 is a diagram showing an example of a transmission frame format of transmission data transmitted from the audio compression transmission apparatus shown in FIG. 1;
(A) shows the frame format of the normal transmission data, and (b) shows the frame format of the bypass transmission data.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Audio compression transmission apparatus 11 Audio data internal bus 12 Asynchronous data internal bus 13 Normal communication network 14 Detour communication network 20 Transmission unit 21 Silence compression unit 22 Asynchronous transmission data interface unit 23 Transmission data generation unit 24 Multi-frame synchronization bit generation unit 25 Normal / Detour switching unit 26 normal transmission buffer 27 detour transmission buffer 30 receiving unit 31 normal reception buffer 32 detour reception buffer 33 normal / detour coupling unit 34 received data generation unit 35 multi-frame synchronization timing detection unit 36 silence correction unit 37 Asynchronous reception data interface unit 40 Control unit 41 Detour register

Claims (3)

(57) [Claims] 1. A transmitting side, after digitally encoding a voice signal, inserting asynchronous data during silence to transmit transmission data, and performing silence correction on the receiving side based on the received data.
In a voice compression transmission device for improving transmission efficiency, a detour method for ensuring the stability of transmission quality by detouring the transmission data to a detour communication network in the event of a failure of a normal communication network. When the network is a communication network that does not guarantee intra-frame multi-frame synchronization, the transmission side inserts a multi-frame synchronization bit into the transmission data when transmitting to the detour communication network, and transmits the data. A bypass method for an audio compression transmission device, comprising: performing multiframe synchronization processing corresponding to a multiframe synchronization bit to establish multiframe synchronization. 2. A digital coding of a voice signal on a transmission side, transmission of transmission data by inserting asynchronous data during silence, and silence correction on the receiving side based on the received data.
In a voice compression transmission apparatus for improving transmission efficiency, it is possible to ensure transmission quality stability by diverting the transmission data to a detour communication network that does not guarantee intra-network multi-frame synchronization when a normal communication network fails. A speech compression unit for generating speech / silence discrimination bits and speech coded data from inputted speech data; and asynchronous transmission data for serializing and outputting inputted asynchronous data. An interface unit, a multi-frame synchronization bit generation unit that outputs a multi-frame synchronization bit when the normal communication network fails, connected to the silence compression unit, the asynchronous transmission data interface unit, and the multi-frame synchronization bit generation unit, The voice / silence identification bit is monitored, and the voice / silence identification bit detects silence. In the case shown, the serialized asynchronous data is inserted into the silent data position to create normal transmission data, and in the event of a failure in the normal communication network, the multi-frame synchronization bit is inserted into the normal transmission data to bypass the normal transmission data. A transmission data generation unit that generates time transmission data; a normal / detour switching unit that distributes transmission data generated from the transmission data generation unit according to the normal transmission data and the detour transmission data; A normal transmission buffer for storing the normal transmission data distributed by the switching unit and transmitting the stored normal transmission data to the normal communication network; and storing the detour transmission data distributed by the normal / detour switching unit. A transmitting unit of the audio compression transmission device, comprising: a detour transmission buffer for transmitting the stored detour transmission data to the detour communication network. 3. A receiving section of the audio compression transmission apparatus for receiving data transmitted from the transmission section of the audio compression transmission apparatus according to claim 2, wherein the reception section is connected to the normal communication network and transmits the normal transmission data in a normal state. A normal reception buffer that stores the received data, a detour reception buffer that is connected to the detour communication network, and stores the detour transmission data as the detour reception data, and is connected to the normal reception buffer and the detour reception buffer. Combining the normal reception data output from the normal reception buffer and the detour reception data output from the detour reception buffer to output reception data, and performing multi-frame synchronization from the detour reception data. A normal / reverse coupling unit that extracts bits and establishes multi-frame synchronization in response to the extracted multi-frame synchronization bits A multi-frame synchronization timing detection unit that outputs a synchronization timing detection signal, a reception data generation unit that outputs reception data excluding the multi-frame synchronization bit based on the synchronization timing detection signal, and a connection to the reception data generation unit A silence correction unit that performs silence correction of the reception data based on the sound / non-speech identification bit in the reception data output from the reception data generation unit and reproduces the audio data; and the reception data generation unit. And an asynchronous reception data interface unit for extracting the asynchronous data from the reception data based on the sound / non-speech identification bit in the reception data output from the reception data generation unit. Receiver.