JP2001069099A - Control data communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To treat control data as fixed length data and also to fetch voice data into a voice frame by transmitting control data by multi-frame and inserting 'zero' at every two bits or fur bits. SOLUTION: An eight-bit control flag which indicates the head of the fame is added to control data s101 of a data shaping circuit 102, data are divided into clocks at every four bit, 'zero' is inserted to prevent '1' from becoming continuous for five bits between the blocks and primary shaping data is obtained. Primary shaping data is divided into cells by four bit unit and inserted to the one frame of voice data outputted from a voice codec circuit 104 to obtain secondary shaping data S102. Secondary shaping data S102a passing through the data shaping circuit 102 is guided respective terminals 12a-12n with a transceiver circuit 103. The data shaping circuit 106 extracts, assembles and operates control data concerning data passing through the transceiver circuit 107.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control data communication system, and more particularly to a main line control data communication system for performing voice / control data communication.

[0002]

2. Description of the Related Art Conventionally, a system shown in FIG. 3 has been proposed as this type of control data communication system.

FIG. 3 is a block diagram showing an entire communication device using a conventional control data communication system.

In FIG. 3, a control data communication device using a trunk control data communication system includes a controller 31 and terminals 32 connected to the controller 31 via trunk lines L301 and L302.
, 32i,... 32n.

The controller 31 has a central processing unit (hereinafter referred to as a CP).
U) 301, data shaping circuits 302 and 308, transceiver circuits 303 and 309, and a voice codec circuit 307. Each terminal 32a,..., 3
32n are composed of a CPU 306, data shaping circuits 305 and 311, transceivers 304 and 310, and an audio codec circuit 312, respectively.

FIG. 4 is a diagram showing a timing chart of control data of the conventional system.

In FIG. 4, control data S301 and restored control data S303 are an 8-bit corridor light address, a bet number, a channel designation, a command, a command operand, and a 16-bit CRC (cyclic redundancy check), respectively. ). The shaping data S302 of the data shaping circuit 302 includes a flag sequence and transmission data.

Next, each terminal 32a,.
, 32i,... 32n will be described.

First, the control data S301 output from the CPU 301 is input to the data shaping circuit 302.
The data shaping circuit 302 outputs the flag sequence “0111”
A process of zero insertion for preventing the addition of 1110 "and the misidentification of the flag sequence is performed. That is, the data shaping circuit 302 adds the control data S301
The flag sequence “01” indicating the head of the frame 301
111110 "and control data S301
When there is data in which five consecutive "1" bits are present, zero "0" is inserted after the five bits in order to distinguish this control data S301 from the flag sequence. Shaped data S3 that has passed through the data shaping circuit 302
02 is connected to the trunk line L301 via the transceiver circuit 303.
, 32i,... 32
n.

The data is input to the data shaping circuit 305 via the transceiver circuit 304.
The data shaping circuit 305 detects the position of the first frame from the flag sequence and deletes the bit into which zero “0” has been inserted. Data shaping circuit 305
Control data S30 restored by passing
3, that is, the restored control data S303 in which the position detection of the first frame and the zero-removal operation have been performed are:
The data is input to the CPU 306 as clear data of the first frame.

The voice data is sent to the voice codec circuit 312 by the same operation as the control data. That is, the transmission data of the voice codec circuit 307 is input to the data shaping circuit 308 to add a flag sequence, perform a zero insert process, and pass the voice data restored by passing the data shaping circuit 308 to the transceiver. In circuit 309, main line L302
This is received by the transceiver circuit 310, and the data shaping circuit 311 detects the leading frame.
A zero remove process is performed, and output data of the data shaping circuit 311 is sent to the audio codec circuit 312.

[0012]

In the control data communication system having such a configuration, when there is data in which six bits of "1" are continuous in the transmission data string, this data is distinguished from the flag sequence "01111110". And the data shaping circuit must perform zero insert processing and zero remove processing,
For this reason, the frame has a variable length, and there is a problem that it is difficult to fit the same frame as the data for transmitting and receiving the audio signal sampled at fixed intervals.

The present invention has been made in order to solve the above-mentioned difficulties. The control data is divided into four bits, and zeros are inserted between the divided control data. It is an object of the present invention to provide a main line control data communication system capable of handling data as fixed-length data and enabling control data to be fetched into a voice frame of voice data by making it possible to distinguish between the data and the data. .

[0014]

In order to achieve the above object, the control data communication system according to the present invention transmits control data and voice data by transmitting the control data in a multi-frame and using two bits or two bits. By inserting a zero “0” every four bits, the data is handled as fixed-length data and can be captured in the audio frame of the audio data.

According to such a control data communication system,
The control data is divided into 2 bits or 4 bits, and zeros “0” are inserted between the divided control data so that the data can be distinguished from the flag sequence “01111110”. And by transmitting in multiple frames,
Control data can be inserted into the audio data frame.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the control data communication system of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall block diagram of a communication apparatus using a control data communication system according to an embodiment of the present invention.

In FIG. 1, a trunk control data communication apparatus according to the present invention includes a controller 11 and a trunk L101 connected to the controller 11.
.., 12i,.
.., 12n. The controller 11 has a CP
U101, data shaping circuit 102, transceiver circuit 1
03 and an audio codec circuit 104. Each terminal 12a,..., 12i,.
Comprises a CPU 105, a data shaping circuit 106, a transceiver circuit 107, and a voice codec circuit 108.

FIG. 2 is a diagram showing a timing chart of control data of the present invention.

In FIG. 2, the control data S101 and the restored control data S103 are each composed of an 8-bit corridor light address, a bet number, a channel designation, a command, a command operand, and a frame composed of a 16-bit CRC. ing. The primary shaping data S111 on the transmitting side is divided into 8-bit control flags of “01111110” and blocks of 4 bits, and includes transmission data blocks in which zero “0” is added between blocks. Secondary shaped data S passed through data shaping circuit 102
Reference numeral 102 denotes an 8-bit voice / control flag of "01111110", 4-bit control data cells SL1, SL2, SL3, and SL4 obtained by adding zero "0" between cells, and zero "0" added between cells. 4-bit control data cell S sequentially extracted from the control flag of the primary shaping data S111
L1, SL2, SL3 and SL4. The restored primary shaped data S113 on the receiving side is “0111
The block is divided into 8-bit control flags of 1110 "and blocks of 4 bits, and is composed of blocks of received data with zero" 0 "added between the blocks.

Next, each terminal 12a,.
, 12i,..., 12n will be described.

.., 12 from the controller 11.
When transmitting control data to i,... 12n, first,
The control data S101 output from the CPU 101 is input to the data shaping circuit 102. Thus, as shown in FIG. 2, the data shaping circuit 102 performs a control data decomposition / insertion operation. That is, the control data S
101, “01111110” indicating the beginning of the frame
And a transmission data is divided into blocks every 4 bits, and between the blocks,
Even when the control data S101 has the same data string pattern as the control flag, zero “0” is inserted so that “1” does not continue 5 bits or more. The primary shaping data S111 is obtained by the above-described control data decomposition operation.

Next, the primary shaping data S111 is divided into cells in units of 4 bits from the control flag, and this is divided into one cell of the audio data output from the audio codec circuit 104.
It is inserted in a frame and transmitted in a multi-frame. By the above control data insertion operation, the secondary shaping data S102
Is obtained. Note that zero “0” is inserted between cells so as not to be mistaken as a control flag. Also, the cells may straddle between frames.

The secondary shaping data S102 that has passed through the data shaping circuit 102 is transmitted as a multi-frame via the transceiver circuit 103 via the trunk line L101 to each terminal 12
, 12i,... 12n.

The secondary shaping data S 102 that has passed through the data shaping circuit 102 is transmitted via the transceiver circuit 103
It is guided to the terminal 12i along the trunk line L101. The data that has passed through the transceiver circuit 107 is subjected to control data extraction / assembly operations by the data shaping circuit 106. That is, the data shaping circuit 106 detects the voice / control flag "01111110", extracts control data cells SL1, SL2, SL3, and SL4 therefrom and performs an operation of arranging the cells. Then, the primary shaping data S113 restored by performing the cell extraction operation
Is detected from the control flag, and this is input to the CPU 106 as restored control data S103. As for audio data, audio data cells SL1, S1
L2, SL3 and SL4 are extracted and the audio codec circuit 1
08. Here, the data string “...
110... ", The data string is divided into four bits of blocks or cells, so that confusion with a flag and a change in frame length do not occur.

In the above-described embodiment, a case is described in which control data is divided into blocks of 4 bits and zeros "0" are inserted between blocks. However, the present invention is not limited to this. For example, the control data may be divided into blocks every two bits, and zero “0” may be inserted between the blocks.

[0027]

As is apparent from the above description, according to the control data communication system of the present invention, control data is divided into 2 bits or 4 bits, zeros "0" are inserted between them, and the flag sequence " Since it is configured to be distinguishable from “01111110”, the frame can be of a fixed length, and control data can be inserted into a frame of audio data by transmitting in a multi-frame.

[Brief description of the drawings]

FIG. 1 is an overall block diagram of a communication device using a control data communication method according to an embodiment of the present invention.

FIG. 2 is a diagram showing a timing chart of control data of the present invention.

FIG. 3 is an overall block diagram of a communication device using a conventional control data communication method.

FIG. 4 is a diagram showing a timing chart of control data of a conventional method.

[Explanation of symbols]

 11 ... Controllers 12a to 12n ... Terminals 101 and 105 ... CPUs 102 and 106 ... Data shaping circuits 103 and 107 ... Transceiver circuits 104 and 108 ... Sound codec circuits S101 ... Control data S111: primary shaping data S102: secondary shaping data S113: restored primary shaping data S103: restored control data L101: trunk line

Claims (1)

[Claims] When transmitting control data and voice data, the control data is transmitted in multiple frames, and
A control data communication system characterized in that data is treated as fixed-length data by inserting zeros "0" at every bit or every four bits, and can be taken into an audio frame of the audio data.