JPH0834641B2 - Time division exchange circuit - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a digital electronic exchange, a main unit of a digital button telephone, etc., and exchanges time-divided digital signals such as digital voice signals and digital data signals between terminals. The present invention relates to a time division exchange circuit for performing.

2. Description of the Related Art FIG. 2 is a block diagram showing the configuration of a conventional time division switching circuit.

The time division exchange circuit 10 is connected to a main control circuit 4 that controls overall call processing for a digital electronic exchange and the like, and is also connected to an input highway 1 and an output highway 6. That is, the time division exchange circuit 10 is connected to the input highway 1 and the output highway 6 to store the call division memory 2 for storing the time division information, the holding memory 3 for storing the information from the main control circuit 4, the input highway 1 and the output highway. 6 transmits the information from the clock / frame signal generator 5 and the main control circuit 4 which give a synchronization signal to the time division information to the holding memory 3 or transmits the information on the time division exchange circuit 10 side to the main control circuit 4. It is composed of an external interface unit 7 that operates. The main control circuit 4 outputs the connection information of the exchange and the information stored in the holding memory 3 to any time slot number (temporal position) of any highway number (physical position) of the output highway 6. Outputs information to instruct whether to do.

 Next, the operation of the above conventional example will be described.

The time division information transmitted via the input highway 1 is, as shown in FIG. 3, A0, B0, C0 ... In the input highway number 1 and A1, B1 in the input highway number 2. , C1 ... exist on each time slot. As shown in FIG. 4, the time division information is stored in the call memory 2 having an address corresponding to the input time slot number in the upper portion and corresponding to the input highway number in the lower portion. The time division information is written in the call memory 2 in synchronization with the input timing generated by the clock / frame signal generator 5.

Here, as shown in FIG. 5, the output time slot number is written as data to the holding memory 3 having the upper address corresponding to the output time slot number and the lower address having the address corresponding to the output highway number. It is assumed that the output highway number is written in the lower order. Then, at the output timing of the time division information from the clock / frame signal generation unit 5, the output time slot number (upper) and the output highway number (lower) are stored in the holding memory 3.
Is output as the read address, the data stored in the holding memory 3 is output as the read address of the call memory 2. By inputting this address, call memory 2
As shown in FIG. 3, the time division information stored in the input highway 1 has a different order from that on the input highway 1, B0, B1, A1, ..., A0,
It is output on the output highway 6 in the order of C1, E0 ...

Therefore, in FIG. 2, the main control circuit 4 rewrites the stored data (input time slot number, input highway number) of the holding memory 3 based on the call control information from the terminal, thereby freely exchanging time division information. Will be possible.

FIG. 6 is a block diagram showing a general configuration of a voice code conversion system used when a digital fixed connection of an international line is used in a digital electronic exchange or the like.

In international communications, it is common knowledge that the calling party converts into the code of the other country as a gentleman's agreement.

In FIG. 6, the voice information exchanged by the time-division exchange circuit 10 is converted by the voice code converter 11 into the code rule of the device of the other country, and sent out through the line interface circuit 11. The voice code converter 11 uses a method of processing with a digital signal, and once an analog signal is restored with a D / A converter, it is encoded with an A / D converter having the coding rule of the other device. There are two types: system.

However, in the configuration of the conventional example as described above, since the voice code converter 11 is arranged on the line side outside the time division switching circuit 10, a line connected to the digital public network is provided. As the number of voice code converters increases, a corresponding voice code converter is required, which leads to an increase in cost, and when analog voice code converters are used, there is a problem that noise is easily mixed. .

The present invention is to solve such a conventional problem, and by providing a voice code conversion function in itself, without externally connecting the voice code converter, and further, without being affected by noise, An object of the present invention is to provide a time division exchange circuit capable of converting division information into a desired code and outputting the code.

Means for Solving the Problems To achieve the above object, the present invention provides an input highway for inputting and outputting a digital signal to which a highway number indicating a physical position and a time slot number indicating a temporal position are assigned. , An output highway, a call memory that stores a digital signal input from the input highway in an area having an address corresponding to the time slot number and the highway number, and if the digital signal is a digital data signal, A data signal main control circuit that rewrites the time slot number and the highway number of the call memory based on the call control information from the terminal and outputs them to the output highway, and a plurality of regional communication protocols regarding digital voice signals A holding memory that stores the programs that can be selected and the digital signal In the case of a digital voice signal, the voice signal is converted into the voice signal according to a new communication protocol based on the selected communication protocol program, and the time slot number and the highway number of the communication memory are used as call control information from the terminal. And a main controller for audio signals which is rewritten based on the above.

According to the present invention, when the output signal is a digital data signal, the present invention rewrites the time slot number and the highway number of the call memory based on the call control information from the terminal and outputs them, as in the conventional case. In addition to outputting to the highway, if it is a digital voice signal, it is converted to a voice signal according to the new communication protocol based on the selected communication protocol program, and the time slot number of the call memory and the highway number are called from the terminal. It is rewritten based on the control information and output to the output highway.

Examples Hereinafter, examples of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a time division exchange circuit in an embodiment of the present invention.

In this embodiment, the same parts as those in the conventional example shown in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted. The feature of this embodiment is that, in addition to the conventional example, the holding memory 3 also has a voice code control area for storing coding rule information from the main control information 4 in addition to the exchange control information from the main control circuit 4. A voice code conversion memory 8 is provided between the call memory 2 and the holding memory 3 and the output highway 6. The voice code conversion memory 8 stores in advance, as digital data, the correspondence between the code rule used by itself and the code rule used by the partner device.

Next, the operation of the above embodiment will be described. The description of the parts shown in FIG. 2 will be omitted because it will not be repeated.

The exchange control information (the input time slot number and the input highway number of the time division information to be output) and the coding rule information output from the main control circuit 4 are written in the holding memory 3 via the external interface unit 7. The coding rule information is written in the voice code conversion control area in the holding memory 3. In this voice code conversion control area, as in the exchange control area, the address is the output time slot number,
Corresponds to the output highway number. Further, at the output timing, the stored input time slot number and input highway number are output from the holding memory 3 as the address of the call memory 2, and the coding rule information is output as a part of the address of the voice code conversion memory 8. Subsequently, the stored time division information is output from the call memory 2 to which the address is input, and together with the code rule information output from the holding memory 3, the address of the voice code conversion memory 8 is formed.
When this address is input, the voice code conversion memory 8 outputs the time division information converted into the desired voice code to the output highway 6.

As described above, according to the above-described embodiment, the time-division exchange information can be converted into a desired voice code by the voice conversion function provided in itself and output to the output highway 6.

EFFECTS OF THE INVENTION As is apparent from the above-described embodiment, the present invention is effective even when the number of lines connected to the digital public network increases.
It is not necessary to connect a voice code converter to the outside, and the integration can be achieved. Moreover, since an analog signal is not used in the process of voice code conversion, it is less susceptible to noise and quality can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a time division exchange circuit according to an embodiment of the present invention, FIG. 2 is a block diagram showing a conventional time division exchange circuit, and FIG. 3 is a relation between input / output highway numbers and time slots. Explanatory diagram, FIG. 4 is an explanatory diagram showing the relationship between the address and data of the call memory, FIG. 5 is an explanatory diagram showing the relationship between the address and data of the holding memory, and FIG. It is a block diagram which shows the structure for sending information outside. 1 ... input highway, 2 ... call memory, 3 ... holding memory, 4 ... main control circuit, 5 ... clock / frame signal generator, 6 ... output highway, 7 ... external interface, 8 ... … Voice code conversion memory.

Claims (1)

[Claims] 1. An input highway, an output highway, and a digital signal input from the input highway, which are input and output by a digital signal to which a highway number indicating a physical position and a time slot number indicating a temporal position are assigned. A call memory for accumulating in an area having an address corresponding to the time slot number and the highway number; and, when the digital signal is a digital data signal, the time slot number and the highway number of the call memory, A data signal main control circuit that rewrites based on the call control information from the terminal and outputs to the output highway, a holding memory in which a plurality of regional communication protocol programs regarding digital audio signals are selectively stored. When the digital signal is a digital voice signal, the selected communication storage program is selected. A voice signal main controller that converts the voice signal according to a new communication protocol to the voice signal based on the program and rewrites the time slot number and the highway number of the call memory based on call control information from the terminal. A time-division exchange circuit equipped.