JPH03270424A - Sound data compression multistep connecting system - Google Patents

Abstract

PURPOSE:To reduce the number of times for compressing/extending data and to improve the quality and reliability of a sound by adding and utilizing a through function into a so-called digital relay line trunk so as to pass the compressed data to be transferred to a repeater station as it is. CONSTITUTION:A nextwork device 33 as a relay exchange is equipped with sound compressing/extending devices 40 and 40 with the built-in through functions and connected through multiplexers 43 and 44, which erase sound compressing/extending functions, to a digital transmission line. Namely, the compressing/extending function is realized by sound compressing/extending devices 32, 37, 40 and 40 provided in the digital relay line trunk and corresponding to respective calls, it can be controlled from the side of the network device whether the compressing/extending function is operated or not. When the data to be transferred between both terminals 2a and 2b pass through a relay exchange 33 as a repeater station 51, the compressed, multiplexed and transferred data pass through by the sound compressing/extending device 40 as they are. Thus, the number of times for compressing/extending the data is reduced and the sound quality is improved.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to an audio data compression multi-stage connection system for compressing, multiplexing, and transmitting data between terminals in one communication network.

The purpose of this invention is to provide an audio data compression multi-stage connection method that reduces the number of times data is compressed and expanded during data transfer, thereby improving the quality and reliability of audio (including video).

The relay station is configured to add a through function that allows compressed data to pass through as is, and to transmit using the through function to prevent undesired repetition of compression and expansion.

[Industrial Field of Application] The present invention relates to an audio data compression multi-stage connection system that compresses, multiplexes, and transmits data between terminals.

Compressed data is multi-electronic and transferred to the digital relay network that connects the originating station to which the terminal is connected, the relay station 1 and the terminating station, increasing the efficiency of using one communication network.

Under these circumstances, there is a need for technology that increases the reliability of voice quality.

[Conventional technology]

A conventional 5"-data compression multi-stage connection node will be explained with reference to FIGS. 6 and 7.

As shown in FIG. 6, an illumination communication network usually includes a plurality of terminals 1a and 1b, such as telephones, for example.

4J1 cut off the communication partner 2. and a switch (network device fNW) 4.5.6 for specifying the information. For the sake of explanation, it shows the intervention of 23 aircraft, but 1
For example, in the figure, the switch on the right side and 1 on one side (hereinafter referred to as
(referred to as the subscriber exchange) 4.6 has terminals la, ll) and 1.
．． C (subscriber circuit) 7.8 and digital trunk trunk 9
．． 10 and multiplexing devices 19.22 are provided. In addition, in the figure T, the intermediate switching equipment (hereinafter referred to as the trunk switching equipment) 5 is operated by one person, and the output side C is equipped with a digital trunk line I, rank 11, 12, etc. multiplexing equipment W20.
21 is provided. And, they are connected by each h digital transmission line 13.

Each subscriber and relay exchange in this type of communication network 11
! ! The data processing performed on machine 4.5.6 is.

The target data is 64 Kbps. Therefore, during actual data transfer, 1. ! An audio data compression multi-stage connection method is adopted. 7: L, one terminal 1
When data is transferred from a to the other terminal 1b, the data is processed on the subscriber exchange a4 side, which is the originating station, and then the multi-electrification device 19 compresses and multiplexes the data, and then transfers the data to the relay station. It is sent to the subscriber exchange a6, which is the destination station, via the relay exchange 5, via j-2. For data processing at the receiving station, data expanded by the multi-electrification device 22 and restored at 64 Kbps is supplied to the terminal 21). Data transfer (communication) is performed between the terminals 1a and lb in this manner (1), and the same is true for the reverse (transfer at the time of response).

Transmission like above? In this case, even when data compressed to 32 Kbps or the like passes through the relay exchange 5, which is a relay station, it is once decompressed by the multiplexer 20.
64 and restore it to the old 1pM data and replace it. The data is then compressed and sent to the called party. The reason for this can be considered to be that the relay station may become the receiving station.

FIG. 7 shows the main structure of the parts related to compression and decompression in the multiplexing device.1. ing. In addition, in the same figure, the code 19.2
Case 1 is shown as an example.

14... is a data compression function, and the compressed data is combined (multiplexed) by the combination function 15. 16... is the compressed data decompression function, which separates (transferred) data by the separation function 17. The data is expanded by N minutes) and then decompressed. That is, the multi-electrification device F21 configured in this way
The data is decompressed by the decompression function 16 and then transferred to the relay exchange 5δ. Sled.

Then, the data is again compressed and multiplexed by the compression function 14 of the multiplexer 20 and transferred to the subscriber exchange 4 on the left side of the figure, which has three destination stations.

[Problem to be solved by the invention]

In the conventional voice data compression multi-stage connection, the horn type, when data is transferred between each terminal, the data must be compressed and decompressed even when passing through the exchange that serves as a relay station. The more you go through (, this voice (
There was a problem in that the quality of the images (including images) deteriorated, leading to problems.

Furthermore, this also poses a problem in that G3 also becomes a major hindrance when transmitting signals for models such as G3 faxes.

Furthermore, since the compression/expansion function was provided in the multi-electronic equipment, it was difficult to control the function depending on the state of each call.

The present invention has been made to solve this problem, and is designed to solve the problem of El = 7j when transferring data. It is an object of the present invention to provide a voice data compression multi-stage connection system that greatly reduces the number of times data is compressed/expanded in two steps and improves the quality reliability of voice (including images).

[Means to solve the problem]

FIG. 1 shows a basic configuration diagram of the present invention.

In the same figure, reference numerals 31 and 36 are network devices such as subscriber exchanges, which are equipped with voice compression/expansion devices (equipped with a compression/expansion function in the digital trunk trunk) with a built-in through function. , are connected to the digital transmission line via multiplexers 41 and 42 that have no audio compression/expansion function. And the former network device i! 31 is connected to the terminal 2a via an LC (subscriber circuit).
is connected to the latter network device 36, and the terminal 2b is similarly connected to the latter network device 36. 33 is a network device, for example, a relay exchange, which is equipped with voice compression/expansion devices 40, 40 with a built-in through function, and is connected to a digital transmission line via multiplexing devices 43, 44, which have the voice compression/expansion function removed. There is.

Note that between the subscriber circuit LC and the network device 31,
Between multiplexing devices 32 and 40, between multiplexing bags W144 and 42,
The network device 36 and the subscriber circuit LC are connected through digital transmission lines, respectively.

In the case of the present invention, the audio compression/expansion devices 32.37, 40.4 have the compression/expansion functions, which were provided on the multiplexing device side in the conventional case, in the digital trunk trunk.
0 is used, and whether or not the compression/expansion function is activated can be controlled from the network device side for each call.

[For production]

According to the audio data compression multi-stage connection system of the present invention, when data transferred between both terminals 2a and 2b passes through the relay exchange 33, which is the relay station 5I.

The compressed, multiplexed, and transferred data is passed through the audio compression/expansion device 40 as it is. This makes it possible to significantly reduce the number of times data is compressed and expanded during data transfer.

〔Example〕

EMBODIMENT OF THE INVENTION Below, one embodiment of the present invention will be described in detail based on the accompanying drawings.

FIG. 2 shows the configuration of a first embodiment of the present invention. In the figure, symbols 3a, 3b, 3c, and 3d are telephones (terminals), 21
, 22, 23.24 is LC (subscriber circuit), 31.36
3 is a subscriber exchange (network device NW), 33 is a relay exchange (network device NW), and 32.37 is a voice compression/expansion device.

Reference numerals 34 and 35 designate a digital transmission line, and 41, 42, and 4344 designate multiplexing devices, respectively.

This communication network includes a voice compression/decompression device 32 in a subscriber exchange 31 to which a plurality of terminals 3a and 3b are respectively connected via LCs 21 and 22. Similarly, a plurality of other terminals 3c and 3d are connected via LCs 23 and 24. A voice compression/expansion device 37 is provided in the subscriber exchange 36 connected to
．． 35, and are connected to each other by a digital transmission line 38 with multiplexing devices 41, 42, 43, and 44 interposed therebetween.

Terminals 3a, 3b, 3c, 3d and LC21, 22°23.
24 is exactly the same as that used conventionally, so the explanation here will be omitted.

The subscriber exchanges 31, 36 include 1, for example, each terminal 3a,
3b, 3c, or 3d, and a space switch having a gate matrix for switching to the desired output highway, that is, the destination terminal. ing. This also applies to the relay exchange 33, although the terminals are not connected thereto, but the configuration is generally similar. Therefore, it is possible to accommodate terminals in this relay exchange 33 as well.

FIG. 4 shows the main structure of the portion related to compression/expansion functions in the audio compression/expansion devices 32, 34, 3537. Note that FIG. 4 shows an example of the audio compression/expansion device 35. In other words, the output highway (×N
), a through buffer 40 and a compression function 41 are connected in parallel and integrated into a set by an SEL (selecting switch) 42, and each of the 5 IELs 42 . . . is combined by a combining function 43. The output of the coupling function 43 is guided to a multiplexer 44 and communicated to the local exchange 36 side. The data exchanged as 64 Kbps data by the relay exchange 33 is compressed by the compression function 41, selected by the 5EL 42, and transferred to the combination function 43.

Data that passes through the relay exchange 33 as is, that is, 32K
bps data is sent via the previous through buffer 40, the transfer timing is determined by the through buffer 40, and
It is selected by EL42 and transferred to the combining function. Further, the data compressed into bps unit data, multiplexed and transferred from the subscriber exchange 36 side to 32 is led to a separation function 44 which separates the data into each unit of data. Each separation output terminal of this separation function 44 has a through buffer 4.
0' and an expansion function 45 are provided in parallel, 5EL42
' to form a set, and further direct each S E L 42' to a corresponding input of the relay exchange 1133. If the separated transferred (compressed) data is not destined for the relay exchange 4ia33, the above-mentioned through buffer 40'
The through buffer 40' determines the transfer timing, and the 5EL 42' selects the data and directs it directly to the corresponding relay exchange 33.

When the separated transfer data is for the relay exchange 33 as the receiving station, the separated transfer data is restored to data in units of 64 Kbps by the decompression function 45 and 5EL4.
2' and guided to the relay exchange 33.

Next, the operation of the audio data compression multi-stage connection system in this embodiment will be explained with reference to FIG.

In addition, here, in the same figure, the pro-7 centering on the subscriber exchange 31 on the left side is used as the originating station 50, and the relay exchange 3
In the following description, the block centered on the subscriber exchange 36 on the right side is assumed to be the relay station 51, and the block centered on the subscriber exchange 36 on the right side is assumed to be the receiving station 52.

When data is transmitted from the terminal 3a on the originating station side to the terminal 3c on the receiving station side, first, the telephone number data of the terminal 3c is sent from the terminal 3a of the originating station 51. Telephone number data is sent to the central control unit 53 of the subscriber exchange 31 via the LC 21.
is input. In the central control unit 53, the subscriber exchange 31
The exchange process is performed at the terminal 3c, and the data is transferred to the relay station 51 toward the location of the terminal 3c, which is the connection destination. At this time, the central control device 53 instructs the audio compression/expansion device 32 to compress the audio data to be sent later.

The relay station 51 that has received the telephone number data inputs the data to the central control unit 54, and determines whether the data is intended for the local line or another station. If it is determined that the telephone number data received here is for an extension within your own office.

The voice compression/expansion device 34 with a built-in through function is instructed to expand the data that will be transferred later, that is, the compressed and multiplexed voice data, and the relay exchange 33 is instructed to transfer the expanded voice data to the own local line. command to input.

If it is determined that the telephone number data is intended for another station, it instructs the relay exchange 33 to transfer the voice data that will be transferred later to the destination station 52 as the destination light. That is, at this time, the through function (buffer 40) is applied to the previous audio compression/expansion device 34 with built-in through function and the other audio compression/expansion device 35 with built-in through function.
is activated (selected), and the audio data that is compressed (multiplexed) and transferred after 5 is instructed to be passed through as is.

The receiving station 52 that has received the telephone number data inputs the data into the central control unit 55, and determines whether the call is for an internal extension of the local station or for another station. Here, since the received telephone number data is for an internal extension, the subscriber exchange 36 is instructed to transfer this telephone number data to the terminal 3c, and the terminal 3c is called via the LC 23.

Also, at this time, a command is given to the audio compression/expansion device 37 to activate (select) the expansion function and to expand and restore the compressed audio data that will be sent later. In addition,
When the terminal 3c is called, if voice data is sent from the terminal 3c first, the voice data is transmitted by the subscriber exchange 36 to the previous terminal 3a. That is, the audio data is compressed (multiplexed) by the audio compression/expansion device 37 and transferred to the terminal 3a.

When the telephone number data is transferred to the terminal 3C of the receiving station 52 and the terminal 3C is called, voice data is sent from the terminal 3a of the second originating station 50. in this case.

Since the destination of the audio data has already been determined, LC21
After passing through the subscriber exchange fi 31, the audio signal is compressed by the audio compression/expansion device 32 and transferred to the relay station 51.

Once transferred to the relay station 51, this audio data is transferred from the audio compression/expansion device 34 with built-in through function to the audio compression/expansion device 35 with built-in through function as previously determined. Pass through Banfa 40.40').

It is transferred to the destination station 51.

When transferred to the second receiving station 51, this voice data is expanded by the voice compression/expansion device 37 and then transferred to the subscriber exchange 3.
6 and the LC 23, the call is transferred to the terminal 3C and a telephone call is executed.

As described above, according to the audio data compression multi-stage connection system of the second embodiment, by providing a through function to the audio compression/expansion devices 34 and 35 of the relay station 51, it is possible to transmit and receive compression/expansion of transferred audio data. This means that it is only necessary to perform the process once at the station 50.52, thereby avoiding deterioration in voice quality and making it easier to transfer modem signals such as G3 faxes.

Although the above-described first embodiment has been explained by taking as an example a case in which a through function is added to the audio compression/expansion device 34, 35 of the relay station 51, the present invention is not necessarily limited to this. Alternatively, it may be configured as shown in FIG. That is, in some data communication networks, digital trunk trunks 61 that are not equipped with compression/expansion functions may be used. In this case, a compression/expansion package 65 having a built-in through function may be configured and added to the originating station, the relay station 1, and the receiving station, respectively. The central control unit shown in FIG. 5 gives instructions as to whether to compress, expand, or pass through.

It goes without saying that the second embodiment also provides the same effects as the first embodiment.

Furthermore, a first-order configuration can be adopted as a third embodiment. That is, in the case of performing a through-through, it is possible to adopt a configuration in which the trunks 61 and 61 are directly connected without intervening the compression/expansion package 65 in FIG. 3.

Finally, the audio data compression multi-stage connection system of the present invention can be applied to systems other than the common line signaling system that creates a common line for communication between three stations, and can also be applied to audio multiplexing systems such as 64b.
Of course, the present invention can be applied not only to compression of ps data to 32 bps data but also to other subrate multiplexing methods.

〔Effect of the invention〕

As described in detail above, according to the present invention, a through function that allows compressed data to be transferred to a relay station to pass through as is is added to the digital trunk trunk, so to speak, and is utilized.・The number of decompression operations can be significantly reduced, and the quality and reliability of audio can be greatly improved. This has the advantage that modem signals such as 03 facsimile can be easily transferred. Further, it is possible to arbitrarily control whether or not to activate the through function.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle configuration of the present invention. FIG. 2 is a diagram showing the configuration of the first embodiment. FIG. 3 shows the configuration of the second embodiment, while FIG. 4 shows an example of the configuration of the through function. FIG. 5 shows the operation of the audio data compression multi-stage connection system in the first embodiment. FIG. 6 shows the conventional technology. FIG. 7 shows an example of the configuration of the audio compression/expansion function. 2a, 2b...terminal, 33...relay exchange, 32°44 35 7 40...voice compression/expansion device. 50... Originating station 51... Relay station 52... Terminating station.

Claims (1)

[Claims] Each network device (31) has a data compression/expansion function that compresses audio data from a terminal and prepares for multiplexing.
In the audio data compression multi-stage connection method, which connects 33) (36)... with a digital transmission line, compresses the data, and transmits the audio, the data compressed by each of the network devices (31), (33), (36)... Through function (4
0) is added, and when a certain network device (33) becomes a relay station and relays compressed data from a network device (31) that is a source station, the added through function (40) allows the data to be passed as is. A voice data compression multi-stage connection method characterized in that the voice data is passed through and transferred to a network device (36) which is a receiving station.