JPH02100433A - Voice compression dynamic switching device - Google Patents

Abstract

PURPOSE:To always maximize the utilization efficiency of a transmission band by detecting a use state of a band and executing a dynamic allocation of the band corresponding to said state. CONSTITUTION:A control means 3 detects a band use state by utilizing an output of a voice compression pool 2, executes a dynamic allocation of a compression ratio so that the utilization efficiency of a transmission band becomes maximum from a result of detection, and thereafter, outputs compression ratio information to the voice compression pool 2. Subsequently, a dynamic switch control signal is sent out to a separate route band dynamic switching means 4, and also, an address and the compression ratio information are added to an output of the voice compression pool 2. That is, when a result of detection of a band use state by the control means 3 shows that all bands are being used, the circuit capacity is increased by enhancing a compression ratio and bringing one band to 2-division, 4-divisions or 8-divisions, and when an unused band exists, a high quality voice transmission is executed by lowering the compression ratio. In such a way, the utilization efficiency of a transmission band always becomes maximum.

Description

[Detailed Description of the Invention] [Summary] For example, regarding an audio compression dynamic switching device used in a multimedia multiplexing device, the purpose is to always maximize the utilization efficiency of the transmission band. Corresponding to the compression ratio information, the input audio signal is encoded and compressed using a compression pool and the output of the audio compression pool is used to detect the band usage status, and the detection results are used to determine the efficiency of transmission band usage. After dynamically allocating the compression ratio so as to maximize the compression ratio, the control means transmits compression ratio information and a dynamic switch control signal, and adds an address and compression ratio information to the output of the audio compression pool; The output of the audio compression pool with address and compression ratio information added is assigned to the band of the route corresponding to the address, and the input dynamic switch control signal controls the built-in dynamic switch to compress the audio that has been assigned to 1. The device is configured to have route-specific band dynamic switching means for sending the output of the pool to the transmission route.

[Industrial application field]

The present invention relates to an audio compression dynamic switching device used, for example, in a multimedia multiplexing device.

Currently, the standard audio encoding method used in communication networks is P
With the CM system, the encoding speed is 64 Kb per telephone line.
However, various types of high-efficiency coding have been researched with the aim of making efficient use of two lines.
Three types of high-efficiency encoding technologies are used depending on quality and cost:

On the other hand, due to the development of office automation, computers, and the birth of new services that use video, 6
High-speed digital leased lines from 4 Kb/s to 6 Mb/s have become available, and the encoded audio signals described above are multiplexed using a multimedia multiplexer and transmitted over these high-speed digital leased lines. edge.

It is necessary to always maximize the utilization efficiency of the transmission band.

[Conventional technology]

FIG. 4 shows a block diagram of a conventional example. In the figure, PB
The audio signal from the telephone that has passed through X 11 is applied to the audio compression pool 13 via line 7 node 12, which is a package containing the audio signal.

Audio compression pool is 64 Kb/s, 32 Kb/s,
16 Kb/s has an encoder of 8 Kb/s, and after the input audio signal is converted into a 64 Kb/s digital signal, the defined audio signal is further converted to a corresponding one of three high-efficiency encoders. After being encoded with a high efficiency encoder,
The network boat 14 multiplexes the signal into a 9, for example, 768 b/s transmission signal and sends it out to the transmission path.

[Problem to be Solved by the Invention] Here, the voice line is fixedly allocated to the high-speed digital leased line. For this reason, the band is secured even when the voice line is not in use, and the utilization efficiency of the transmission band is reduced.

An object of the present invention is to always maximize the utilization efficiency of the transmission band.

[Means to solve problems]

FIG. 1 shows a block diagram of the principle of the present invention.

In the figure, 2 is a compression pool that encodes and compresses the input audio signal in accordance with the compression ratio information from the control means;
detects the band usage status using the output of the audio compression pool, dynamically allocates the compression ratio so that the transmission band usage efficiency is maximized based on the detection result, and then dynamically allocates the compression ratio information and the This is a control means that sends a target switch control signal and adds an address and compression ratio information to the output of the audio compression pool.

In addition, 4 allocates the output of the audio compression pool to which the address and compression ratio information are added to the band of the route corresponding to the address, and controls the built-in dynamic switch using the input dynamic switch control signal. This is a path-specific band dynamic switching means that sends the output of the allocated audio compression pool to the transmission path.

[Effect]

In the present invention, the usage status of the band is constantly detected by the control means 3.

When the detection result shows that the entire band is in use, the compression ratio is increased to divide one band into two, four, or eight, thereby increasing the line capacity although the quality deteriorates to some extent. However, when there is an unused band, the compression ratio is lowered to transmit high quality audio.

As a result, the utilization efficiency of the transmission band is always maximized.

Embodiment C] FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is an explanatory diagram of the operation of FIG. 2. Here, the automatic identification section 31 and the control section 32 are the constituent parts of the control means 3, and the switch 41. Band dynamic switch 42. A network boat 43 represents a component of a route-specific band dynamic switching unit. Note that the same reference numerals indicate the same objects throughout the figures. Hereinafter, the operation of FIG. 2 will be explained with one route.

First, the automatic identification section 31 checks whether the input digital signal from the audio compression pool 2 is silent or not, detects whether the band is in use or not, and transmits the detection result to the control section 32.
Send to.

The control unit 32 determines, based on the detection result, that when all the bands are in use, it is 1, for example, 64 Kb/s band is 32 Kb/s x 'l
, or 16 to b/sX4. Or, if there is an unused band, such as dividing it into 8 Kb/s x 8, dynamically allocate the compression ratio so that, for example, a 32 Kb/s x 2 band is used at 64 Kb/s x 1, and then The ratio information is sent to the audio compression pool 2.

Therefore, the audio compression pool 2
BX 11. The audio signal input via the line set 12 is encoded and output. The automatic identification unit 31 adds compression ratio information and a time slot number indicating which band is to be used, and sends the information to the dynamic band switching unit 4 via the switch 41.
Assign to the corresponding timeslot number in 2,
The signal is sent to the transmission path via the network port 43, a dynamic switch turned on by a dynamic switch control signal from the control unit 32.

Since the switch 41 has a function of recognizing the added address, it can send the signal to the time slot number in the dynamic band switching section of the route corresponding to the address.

Next, on the receiving side, when the dynamically allocated multiplexed audio signal is received, the network port 43
．． Band dynamic switching unit 42. Switch 41° Automatic identification section 31
is added to the audio compression pool 2 via.

Therefore, the automatic identification section 31 uses the compression ratio information and the time slot information.
The compression ratio information is input to the audio compression pool via the control unit, so the audio signal is restored and the compression ratio information is input to the audio compression pool. Added to the telephone via PBX 11.

Here, the control unit 32 basically allocates bands starting from the lowest transmission speed. Therefore, as shown in FIG. 3(a), the audio signal is converted into an 8 Kb/s digital signal by an encoder, and multiplexed into, for example, 64 kb/s by an 8 Kb/s multiplexer. Then, 2, for example, 12 signals are multiplexed by a 64 Kb/s multiplexer and sent out to a transmission line in a predetermined band of 768 Kb/s.

At this time, when changing the band, the 8 kb/s is changed to two or four, as shown in FIG. 3(b), without changing the transmission band.

That is, by detecting the usage status of the band and dynamically allocating the band (real-time allocation) in accordance with the detected band usage status, the efficiency of using the transmission band is always maximized.

2 is an audio compression pool, 3 is a control means; Reference numeral 4 indicates route-specific band dynamic switching means.

〔Effect of the invention〕

As described in detail above, according to the present invention, there is an effect that the utilization efficiency of the transmission band is always maximized.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is an explanatory diagram of the operation of FIG. 2, and FIG. 4 is a block diagram of a conventional example. In the figure,

Claims (1)

[Claims] A compression pool (2) that encodes and compresses an input audio signal in accordance with compression ratio information from a control means, and detects a band usage state using the output of the audio compression pool. , After dynamically allocating the compression ratio so that the transmission band usage efficiency is maximized based on the obtained detection results, the compression ratio information and the dynamic switch control signal are sent out, and the output of the audio compression pool is A control means (3) for adding an address and compression ratio information, and a dynamic switch control signal for allocating the output of the audio compression pool to which the address and compression ratio information have been added to the band of the route corresponding to the address and inputting it. A voice compression dynamic switching device characterized by having a route-specific band dynamic switching means (4) for controlling a built-in dynamic switch to send the output of the allocated voice compression pool to a transmission path. .