JPH04207727A - Multiplexing device for speech device - Google Patents

Abstract

PURPOSE:To improve the circuit efficiency as the whole system by providing a means for detecting the amount of information of an input sound signal on each encoding device, and allocating dynamically a channel to every frame. CONSTITUTION:A sound signal inputted to a signal input terminal (1) 1 of a base equipment (B) 101 delimits a frame synchronizing signal generated from a synchronizer (B) 7 by an encoder (1) 4, and its amount of information is detected. In a multiplexer (B) 8, based on each amount of information thereof, the number of channels allocated to each speech circuit, and also, an encoding speed are determined. Also, in an encoder (k) 5, by the number of channels (encoding speed) allocated to itself, the input sound signal is encoded and sent into the multiplexer (B) 8, and by the multiplexer concerned (B) 8, each encoder output and a synchronizing signal and a channel distributing signal are multiplexed, and transmitted to the terminal equipment concerned (T, i) 112 by a down-circuit 121.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a multiplexing device applied to a communication device such as a digital car telephone.

2. Description of the Related Art In general, in a conventional communication device of this type, on the down line side from the base device to the terminal device, and on the opposite side, on the up line side from the terminal device to the base device, As shown in FIG. 3, normally, fixed time-divided channels are assigned to each communication line.

Problems to be Solved by the Invention However, in the case of the above-mentioned conventional communication devices, channels are fixedly assigned, so even when there is no voice input and there is no voice input, the assigned channels cannot be used. The problem is that the channel is monopolized.

The present invention aims to solve these conventional problems by enabling channels to be enabled.

The object is to provide a multiplexed installation of this type of telephone equipment.

Means for Solving the Problems In order to achieve the above object, the present invention provides means for detecting the amount of information of an input audio signal in each encoding device, means for transmitting the amount of information, and means for encoding according to the amount of information. , decoding means, and can dynamically allocate channels for each frame.

That is, the present invention provides for a base device having N (integer) channels, necessary J (integer J≦N) terminals out of M (integer M≧N) terminal devices. This communication device connects devices and performs mutual communication by time division, and on the downlink side from the base device to the terminal device, means for setting a frame synchronization signal synchronized with the frame length of the encoder, and a base device. means for detecting the amount of information in the audio signal input to each encoder, and allocating the total amount of multiplexed information to each encoder for each frame as a maximum value; and inserting the distribution information into the synchronization signal. means for encoding each allocated amount of information and multiplexing it with a frame synchronization signal;
A means for decoding into a predetermined channel based on the frame synchronization signal is provided, and on the uplink side from the terminal device to the base device, the amount of information of the audio signal to be transmitted is detected and a frame synchronization signal transmitted from each terminal device (
means for receiving the amount of information and determining the amount of information that can be allocated to each terminal device based on the amount of information; and means for inserting each allocated amount of information into a downstream frame synchronization signal;
means for receiving a signal of this amount of information in a terminal device and encoding it according to the amount of information; means for delaying this encoded signal and multiplexing it with a signal representing the amount of information; and each of the base devices. A means for decoding according to the amount of information given to a channel is provided, and a channel is dynamically assigned to each communication line for each frame, independently of the uplink and downlink, so that the efficiency of using the five lines can be improved. This is a multiplexing device for communication devices characterized by the following features.

Effects Therefore, according to the present invention, the above-described configuration provides the following effects.

In other words, channels are dynamically allocated for each frame according to the amount of information in the terminal equipment, which improves the line efficiency of the entire system, and eliminates temporal fluctuations in transmission delays, resulting in high quality and Enables highly efficient calls.

Embodiment 1 An embodiment of a multiplexing device for a communication device according to the present invention will be described in detail with reference to FIGS. 1 and 2.

FIG. 1 is a schematic block diagram showing the configuration of a multiplexing device to which this embodiment is applied, and FIG. 2 is an explanatory diagram of the operation of the same device.

That is, in the configuration of the device of this embodiment shown in FIG.
101 is a base device (B) having N (integer) channels, 111. ...112. ...113
is M (integer M≧N) terminal devices (7, 1),...
・(T, i).

...(T, Ml.

First, in the configuration of the base device (B) 101, each signal input terminal (ill, . . . (k)
2゜...(N)3 are the corresponding encoders (1)4゜...-(k)5. ... (N) 6, and the synchronizer (B) 7 is connected to each of these encoders (1) 4. ...(k)5゜...(N)6. and each decoder (1) 12. ...(k)13. ...
・(Nl 14, multiplexer (B)g, and separator (B)
) 15. and the multiplexer (B)
8 is each encoder (1) 4. ...(k)5.・・・
...(N)6. and is connected to the separator (B) 15 and via the downlink 121, each terminal device (T, 1) 111° . . . (T, 1) 112 .
. . . (T, M) 113 is connected to the synchronizer and separator, and in the case of this embodiment, - as an example, the synchronizer (T) 16 and Separator (
T) connected to 17. Furthermore, the separator (B)
15, each of the decoders (1) 12. ...(k)13
．． ...(N) 14 to each corresponding signal output terminal (1) of the device 9. ...(k)10.
...(N) 113, and in the case of this embodiment, the multiplexer (T) of the terminal device (T, i) 112 is connected to the multiplexer (T) of the terminal device (T,
19 are connected.

Subsequently, each of the above-mentioned terminal devices (T, 1111L
...(T, 1)112. ...(T, M1113
In other words, in the case of this embodiment as described above, in the configuration of the terminal device (T, 1) 112, the synchronizer (T,
) 16 is a separator (TIL7. decoder (T) 18 and multiplexer (T) 19. delayer (T) 20. encoder (T) 2
Connected to 1. Moreover, the separator (T) 17 is
The signal output terminal (T) of the device is connected via the decoder (T) 18.
, 1) connected to 22. Furthermore, the signal input terminal (T, i) 23 of the device is connected to the front E encoder fT) 21
and delay device (T) 20 in sequence.
9, and the multiplexer (T
119 is connected to the separator (B) 15 of the base equipment (B) lot via an uplink 131.

Next, the operation of the apparatus configuration according to the above embodiment will be described.

In the explanation of the configuration of FIG. 1 and the frame format and information flow of FIG. 2, in the case of this embodiment, for example, the communication line (k) of the base device (k) 2 and terminal device (T, i)
112 is connected.

In this S, the audio signal input to the old signal input terminal (1) of the base device CB) 1 is first delimited by the encoder (1) 4 from the frame synchronization signal generated from the synchronizer (B) 7. Then, the amount of information is detected, and the encoder (2), . . . (k) 5. ...(N)6
For each of the above, the information amount of the input audio signal is detected and sent to the multiplexer (B) 8. Furthermore, the multiplexer (B) 8 determines the number of channels allocated to each communication line based on each of these amounts of information.

In turn, the encoding speed is determined.

Furthermore, the encoder (k) 5 encodes the input audio signal according to the number of channels (encoding speed) assigned to it and sends it to the multiplexer (B) 8.
The encoder outputs, synchronization signals, and channel allocation signals are multiplexed and transmitted to the corresponding terminal device (T, 1) 112 via the downlink 121.

Then, in the terminal device (T, 1) 112, the synchronizer (T) 16 detects synchronization from the transmission signal via the downlink 121, finds channel allocation based on this, and then separates the signal. The device (T) 17 extracts the corresponding channel, and the decoder (T) 18 decodes and reproduces the audio, and outputs the signal to the signal output terminal (T, i).
Output from 22.

On the other hand, the signal input terminal (T, 1ll12) of the terminal device (T, 1ll12
Regarding the audio signal input to T, i) 23, the encoder (T) 21 detects the amount of information from the audio signal of section n frames cut out by the synchronizer (T) 16, and After the signal is multiplexed with other signals by a multiplexer (T) 19, it is sent to the demultiplexer (B) 15 of the base device (B) 101 via an uplink 131.

Further, in the separator (B) 15, each terminal device (T, 1) 111. ...(T, 1)112.
...(T, M) 113, each of these terminal devices (T, 1) Ill, ... (T, i) 11
2. ...Determine each channel to be allocated to encoding in (T, M) 113 and send it to the multiplexer (B) 8. The multiplexer (B) 8 transmits this channel allocation signal to It is multiplexed with the synchronization signal of the line 121 and sent to the corresponding terminal device (T, 1) 112.

In the terminal device (T, i) 112, the synchronizer (T) 16 detects this channel assignment signal and sends it to the encoder (T) 21, thereby encoding it at a predetermined encoding rate. In this case, in order to shorten the delay of the audio signal, encoded signals encoded at various encoding speeds and stored in the delay device (T) 20 may be used.

Next, the encoded signal is multiplexed with a signal indicating the information amount of the previous frame by a multiplexer (T) 19, and then sent to the demultiplexer (
B) 15, and finally this encoded signal is connected together with the delayer (T) 20 to the multiplexer (T) 19, and the multiplexer (T) 19 connects the uplink 131 to the The signal is then decoded by the decoder (kH3) of the base device (B) 101 and reproduced into audio, which is output from the signal output terminal (k) 10.

The frame format and information flow in each of the uplink and downlink channels in the 2S are as shown in FIG.

Effects of the Invention As is clear from the configuration of the above embodiments, the present invention has the following advantages:
It has the advantage that input audio signals can be efficiently (time-division multiplexed) under limited line capacity, resulting in effective use of channels, and unlike the case of packet transmission, , all of them are synchronized with a frame signal of a constant period, so there is no deterioration in sound quality due to fluctuations in the transmission delay time of the audio signal, and it has excellent features such as high quality and highly efficient communication.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram showing the configuration of a multiplexing device to which an embodiment of the multiplexing device for a communication device according to the present invention is applied, and FIG. 2 is a signal waveform diagram illustrating the operation of the same device. , FIG. 3 is a signal waveform diagram illustrating the operation of the conventional device. 101... Base device CB), 111, 112.113... Terminal device (T, 1),
(T, il, (T, M), 1.2.3...Base equipment signal input terminal (11, (k), (N), 4, 5.
6... Encoder (1), (k), (N), 7
... Synchronizer (B), 8 ... Multiplexer (B), 9, 10.11 ... Base device signal input terminal (1),
(k). (N), 12, 13.14...Decoder (1), (k)
, (N), 15...Separator (B), 16...Synchronizer (T), 17...Separator (T), 18...Decoder (T), 19 ... Multiplexer (T), 20 ... Delay device (T), 21 ... Encoder (T), 22 ... Terminal device signal output, terminal (T, i), 23
...Terminal device signal input terminal (T, i). Agent Patent Attorney Akira Koebushi Two Idiots WJ1 Diagram

Claims (1)

[Claims] For a base device having N (integer) channels, the necessary J(
A communication device that connects an integer of J≦N terminal devices and performs mutual communication by time division, and on the downlink side from the base device to the terminal device, frame synchronization is synchronized with the frame length of the encoder. means for setting a signal; means for detecting the amount of information of the audio signal input to each encoder of the base device and allocating the total amount of information to be multiplexed as a maximum value to each encoder for each frame; means for inserting the distribution information into the synchronization signal; means for encoding each distributed information amount and multiplexing it with the frame synchronization signal; and means for decoding into a predetermined channel based on the frame synchronization signal. In addition, on the uplink side from the terminal equipment to the base equipment, there is a means for detecting the amount of information in the audio signal to be transmitted, synchronizing it with the downstream frame synchronization signal, and sending it to the base equipment, and means for each terminal. A means for receiving the amount of information transmitted from the device and determining the amount of information that can be distributed to each terminal device based on the amount of information, and inserting each distributed amount of information into the downstream frame synchronization signal. means for receiving a signal of this amount of information at a terminal device and encoding it according to the amount of information; means for delaying this encoded signal and multiplexing it with a signal representing the amount of information; means for decoding according to the amount of information given to each channel of the device, and dynamically allocates channels to the uplink and downlink independently and to each communication line for each frame, thereby improving line utilization efficiency. 1. A multiplexing device for communication devices, characterized in that it is capable of increasing the number of telephone devices.