JPH09321731A - Multi-media multiplexing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a mounting rate only by means of a voice channel compressing and expanding part for the portion of n-number lines being fewer than the m-number lines and also to improve line efficiency by utilizing a non- sound part when the voice signal and the data signal of the m-number lines where traffic quantity is not 100% are exchanged and multiplexing other kinds of voice signals and data signals are multiplexed in the non-sound part. SOLUTION: A multi-media multiplexing device 1 is connected by a high-speed digital line 2. The voice signal is transmitted from an exchange 3, etc., and the data signal is from a data terminal 4 and they are received by a low-speed side voice multiplexing and separating part 5 and a low-speed side data multiplexing and separating part 12 through the m-lines. The voice and data signals for the portion of n-number lines fewer than the m-numberlines are multiplexed in a voice side multiplexing and separating part 11 so as to be transmitted to the high-speed digital line 2. The transmitted multiplexing signal is separated into the voice signal and the data signal and distributed to a voice channel part 9 and a data channel part 13. Then, the voice and data signals for the portion of n-number lines are separated into the low-speed side m-number lines.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multimedia multiplexer.

[0002]

2. Description of the Related Art As a conventional technique for multiplexing a voice signal and a data signal transmitted from a voice terminal and a data terminal, for example, a technique described in Japanese Patent Laid-Open No. 61-230440 is known. By detecting the no-call state and inserting the data signal from the data terminal when there is no call,
The line usage cost was reduced by multiplexing the signals. For lines with low traffic volume, the high-speed digital line capacity is fixed even when unused lines occur, so the line usage charge was higher than the actual line usage.

[0003]

The high-speed digital line speed determines the line capacity depending on the number of low-speed lines and the operating speed. At this time, there may be a case where a large number of unused lines exist although the line band is secured. In addition, in the line where voice communication is performed, it is divided into a voiced part and a silent part, and the voiced part does not exist in the silent part, but a predetermined band is secured. As a result, since the band of the high-speed digital line is fixed, there is a problem that the line usage fee becomes high for the line with a small traffic volume relative to the actual line usage.

An object of the present invention is to use m voice channel compression / expansion units for use of m lines in a low speed line in voice communication. Also, by multiplexing the data signal in the silent portion, it is possible to process with n voice channels corresponding to n lines less than m lines, to make the implementation of the low speed side voice channel part efficient, and to use n less than m lines. The aim is to improve the efficiency of high-speed digital line capacity by the amount of increased mounting efficiency on the line.

[0005]

A voice signal transmitted from a low-speed m line always contains a voiced portion while talking and a silent portion while listening to the other party. Before transmitting a voice signal to the voice channel compression / decompression unit, a voiced portion on another line is inserted into a voiceless portion, and voiced portions are multiplexed. In addition, it is necessary to reduce the number of lines to n lines, which is smaller than m lines, by inserting the data signal into a silent portion of the multiplexed line after compressing the voice signal to multiplex the voice signal and the data signal. .

Since there is always a voiced / unvoiced portion in the transmission / reception of voice communication, a voiced / non-voiced detection section for discriminating a voiced voice signal on the transmitting side, and the discriminated voice signal as another voice signal. An audio demultiplexing unit for multiplexing and a control unit for controlling the transmission / reception status of the audio signal and the multiplexing status are provided. On the receiving side, the voice signal transmitted from the high-speed digital line is decompressed in the opposite voice channel, and then the voice signal is separated by the voice demultiplexing unit.

In data transmission / reception, a data signal is received by a data channel unit, a flag addition / removal unit for dividing the data signal and giving a fixed length flag, and a data demultiplexing unit for multiplexing the divided data signal are provided. By providing a data insertion / extraction unit having a voice data monitoring unit that detects a silent portion of the compressed voice signal transmitted from the voice channel unit, a data signal is further added to the silent portion after the voice signal is multiplexed. Insert. On the receiving side, the data insertion / extraction section detects the fixed length flag of the data signal to distinguish the voice signal and the data signal and separate them into the corresponding data channel section.

Therefore, the compression / expansion process can be performed on the m lines on the low speed side by using the voice channels for n lines, which are smaller than the m lines, and the above object can be achieved.

[0009]

1 is a block diagram of a network to which a multimedia multiplexer 1 of the present invention is applied. The multimedia multiplexers 1 are connected to each other via a high-speed digital line 2. A voice signal is transmitted from a voice terminal such as an exchange 3 accommodating a telephone and a facsimile machine, a data signal is transmitted from a data terminal 4, and the voice signal and the data signal are transmitted through an m line to a low speed side voice demultiplexing unit 5 and a low speed side. The data demultiplexing unit 12 receives the voice signals and data signals for n lines less than m lines, multiplexes them by the voice side demultiplexing unit 11, and sends them to the high-speed digital line 2. Also, the multiplexed signal transmitted from the high-speed digital line 2 is separated into a voice signal and a data signal and distributed to the corresponding voice channel section 9 and data channel section 13.
The line voice and data signals are separated into the corresponding low-speed m lines.

FIG. 2 shows a voice signal frame in which voice signals for m lines are input to the low speed side voice demultiplexing unit 5 and a voice signal frame after being multiplexed by the low speed side voice demultiplexing unit 5. Further, in FIG. 3, the low speed side voice demultiplexing unit 5 recognizes the reception state of the voice signal from the low speed side m line and the demultiplexing state of the voice demultiplexing unit 7, and transmits / receives each voice signal and transmits / receives each channel. The block diagram of the control part 8 which specifies the address of a part is shown.

The voice speeds are on condition that they are the same speed and the traffic volume of voice communication is not 100%. A voice signal for m lines is transmitted from the exchange 3 to the low speed side voice demultiplexing unit 5, and voice communication has a voiced portion and a voiceless portion. Perform at each address of the transmitting and receiving part of. Therefore, the reception state determination unit 16 of the control unit 8 determines the input state of the voiced / sound input to the voiced / non-voiced detection unit 6, and the multiplex determination unit 17 of the control unit 8 determines the channel transmission / reception unit of the voice demultiplexing unit 7. The address to be transmitted is determined, and the reception state determination unit 16 notifies the voice / silence detection unit 6. At that time, if the channel transmitter / receiver is performing the multiplexing process, the audio signal is not transmitted to the channel transmitter / receiver, and the channel transmitter / receiver at the address not subjected to the multiplexing process is selected, and the voice / sound detection unit is selected. An instruction is sent from 6 to the corresponding address of the audio demultiplexing unit 7 to send an audio signal. At this time, when some of the channel transmitting / receiving units are performing the multiplexing processing, the receiving state determining unit 16 has a plurality of addresses in the transmitting / receiving units and the channel transmitting / receiving units.
Then, the young address of the transmitting / receiving section is judged, and the multiplex judging section 17 preferentially judges to multiplex to the young address of the channel transmitting / receiving section.

In the voice demultiplexing unit 7, the sound / silence detecting unit 6
The voice signal transmitted from the voice signal is received, and the voice signal transmitted to the voiced / non-voiced detection unit 6 is transmitted next to the voice signal after the end of the voiced portion by the instruction of the multiplex discrimination unit 17 of the control unit 8. Multiplex. Therefore, m sent to the transceiver
A plurality of voice signals from the line can be multiplexed in the order of reception by the voice demultiplexing unit 7 into a plurality of voice signals in one line. The multiplexed audio signal is transmitted to the audio channel section, compressed in each compression / expansion section, multiplexed in the high speed side demultiplexing section 11 and transmitted to the high speed digital line 2.

FIG. 2 shows a multiplexing method in the low speed side audio demultiplexing unit 5. FIG. 6 is a voice signal frame diagram until the process of reducing the number of lines to n lines, which is less than m lines, is performed by multiplexing voice signals for m lines transmitted from the exchange 3. Since the voice signals C1 and D1 are simultaneously input to the transmission / reception unit 6-3 and the transmission / reception unit 6-4 of the sound / silence detection unit 6, the reception state determination unit 16 of the control unit 8 gives priority to the address of the transmission / reception unit in descending order. Then, an instruction is given to transmit to a young address of the channel transmitting / receiving unit. Therefore, the channel transmitter / receiver 7
-1 and the channel transmission / reception unit 7-2 transmit the audio signals C1 and D1. The multiplex discriminating unit 17 of the control unit 8 indicates that the audio signal A1 is received by the transmitting / receiving unit 6-1 next to the audio signals C1 and D1, but that the channel transmitting / receiving unit 7-1 and the channel transmitting / receiving unit 7-2 are processing. It recognizes and issues an instruction to multiplex at the channel transmitting / receiving unit 7-3, which is the next younger address, and transmits it. The audio signal E1 is transmitted next to the audio signal A1. At this time, the channel transmitter / receiver 7-1 transmits the audio signal C1.
Since the processing of No. 1 is completed and the audio signals are taken in in ascending order of the addresses of the channel transmitting / receiving unit,
The audio signal E1 is transmitted to -1 after the audio signal C1.

FIG. 4 shows a data frame diagram in a data demultiplexing state during data communication. The data signals X and Y transmitted from the m line are respectively sent to the data channel unit 13
Data transmitter / receiver 13-1 and data transmitter / receiver 13-2
Sent to. The received data signal is divided every 20 ms in order to be multiplexed on the silent portion of the voice communication, and a flag addition / removal unit 14 that adds the fixed length flag 20 to the beginning of each division is provided, and division from each data line is performed. The demultiplexed data is demultiplexed by the data demultiplexing unit 15. At this time, since the data signal X is one frame, when the data signal X is first received, the data signal X is transmitted by the data demultiplexing unit 15 and then the divided data signal Y is transmitted.

Since the data signal multiplexed in FIG. 4 is multiplexed with the silent portion of the voice signal that has been multiplexed and compressed, 20 ms of the voice signal transmitted from each compression / expansion unit of the voice channel unit 9 is used. The audio data monitoring unit 22 for detecting the above-mentioned silent portion is provided, and the instruction to insert the data signal into the silent portion is issued by giving priority to the young address of each compression / expansion unit. The multiplexing state of the voice signal and the data signal is shown in FIG. 5 as a frame diagram. The audio signal on the n-line side shown in FIG. 2 is compressed by the compression / expansion unit of each audio channel 9, and the divided data signals X and Y are added to the silent parts of the audio signal transmitted from each compression / expansion unit. 20 m after the audio signal D1 transmitted from the compression / expansion unit 9-2 in the audio data monitoring unit 22 is provided with the multiplexed signal receiving unit 21 to be inserted.
The multiplexed signal transmitting / receiving unit 21 detects a silent portion of s or more.
The data signal X1 is inserted by. After inserting the data signal X1, the voice data monitoring unit 22 detects a silent portion of 20 ms or more in order to insert the data signal X2. Since the silence is transmitted before the voice signal D2 transmitted from the compression / decompression unit n9-4, the data signal X2 is inserted, and the silence portion is also transmitted from the compression / decompression unit 9-1. The data signal X3 is inserted after the voice signal B1 as detected in the signal.

On the receiving side, the voice data multiplexed signal demultiplexed by the high speed side demultiplexing section 11 is multiplexed signal transmitting / receiving section 21.
To receive. Since the fixed length flag 20 is added to the head of the data signal, the multiplexed signal transmission / reception unit 21 determines that the data signal has been received, extracts the data signal and the fixed length flag 20, and outputs the data signals X and Y. Is transmitted to the low speed side data demultiplexing unit 12. In the received low-speed data demultiplexing unit 12, the data signal X is sent to the data transmitting / receiving unit 13-1 and the data signal Y is sent to the data transmitting / receiving unit 13-1 in order to be transmitted to the corresponding data transmitting / receiving unit by the data demultiplexing unit 15.
Separate into 2. In the separated data signal, the flag addition / removal unit 14 removes the flag for each divided data, and the divided data is matched for each data transmission / reception unit.
Send to the line.

[0017]

According to the present invention, the traffic volume is 100.
If it is not%, when transmitting and receiving the voice signal and data signal of the m line, the silence part is used, and another voice signal and data signal are multiplexed with the silence part to compress the voice channel for n lines less than the m line. The mounting rate can be improved simply by providing the extension portion. In addition, it is possible to improve the line efficiency by installing only n voice channels.

[Brief description of drawings]

FIG. 1 is a block diagram of a network using a multimedia multiplexer of the present invention.

FIG. 2 is a frame diagram of input / output audio signals in a low speed side audio demultiplexing unit.

FIG. 3 is a block diagram of a control unit that monitors a transmission / reception state of a voice signal in the low speed side demultiplexing unit and a demultiplexing state of the voice demultiplexing unit.

FIG. 4 is a frame diagram of an input / output data signal in a low speed side data demultiplexing unit.

FIG. 5 is a frame diagram of a voice signal and data signal multiplexed state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Multimedia multiplexer, 2 ... High speed digital line, 3 ... Switch, 4 ... Data terminal, 5 ... Low speed side voice demultiplexing unit, 6 ... Sound / silence detection unit, 7 ... Voice demultiplexing unit, 8 ... Control Section, 9 ... Voice channel section, 10 ... Data insertion / extraction section, 11 ... High speed side demultiplexing section, 12 ... Low speed side data demultiplexing section, 13 ... Data channel section, 14 ... Flag addition / removal section, 15 ... Data demultiplexing section Department.

Claims (2)

[Claims] 1. A voice signal transmitted from an exchange on an m line by a high-speed digital line connecting between a transmitter side multimedia multiplexer and a receiver side multimedia multiplexer. In a multimedia multiplexing device having voice channel parts for n lines less than m lines, by multiplexing voice parts and separating the voice parts transmitted by being multiplexed by the receiving side multimedia multiplexer. On the transmitting side, a receiving section for receiving a voice signal of the m line from the exchange and a voice / silence detecting section for discriminating between voiced and non-voiced portions of the received voice signal are provided, and the voice signal determined to be voiced is , A voice demultiplexer that multiplexes with the voice signal to be transmitted next, and voice signals from another line are multiplexed, and voice signals for n lines less than the m lines on the low speed side are transmitted. A channel transmitting / receiving unit for transmitting to the channel compression / decompression unit, a multiplexing discriminating unit for checking the multiplexing state of the voice demultiplexing unit for controlling the multiplexing of voiced parts of voice data, and a voice signal from the m line. The reception status determination unit that recognizes the presence / absence of voice / sound reception at each address of the transmission / reception unit and the reception status determination unit that notifies the transmission / reception status at each address of the channel transmission / reception unit by the multiplex determination unit The low-speed side m is provided with a control unit that multiplexes the voice received from the lower address The voice signals for n lines less than the lines are compressed by the voice channel compression / expansion unit and multiplexed by the high speed side demultiplexer,
On the receiving side, the multiplexed voice signal transmitted through the high-speed digital line is separated by the high-speed side demultiplexing unit,
Decompressed by the opposite audio channel compression / expansion unit, received at each address of the channel transmission / reception unit of the opposite audio demultiplexing unit of the low speed side audio demultiplexing unit, and control the separation of the voiced parts of the audio signal. Therefore, a separation determination unit that recognizes the reception state of the channel transmission / reception unit and specifies the address of each transmission / reception unit, and a transmission state determination unit that issues an instruction to transmit to the low-speed m line from the specified transmission / reception unit address. A multimedia multiplexing apparatus comprising: a voice demultiplexing unit for demultiplexing to an address for each line and transmitting to an m line on the opposite side. 2. A data transmission / reception section of a data channel section of an m line from an exchange receives the data signal and inserts the data signal into a silent portion of the line where the voice signal is multiplexed. A low-speed data demultiplexer having a flag demultiplexer and a data demultiplexer that multiplexes the data signals in the order in which they are received. The multiplexed data signal transmitted from the data demultiplexer is compressed by a voice channel decompressor. A multimedia multiplexing device comprising a data insertion / extraction unit for inserting a silent part transmitted from a device, and multiplexing a data signal into a voice signal for n lines less than m lines.