JPS642256B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a communication path pulse generation method for providing time information for encoding voice to a plurality of communication path boards in a PCM communication system.

Generally, in time-division multiplexing PCM communication equipment that performs communication by time-divisionally encoding audio on multiple communication paths, multiple communication paths are installed to create the multiple communication paths, and these communication paths are In order to make the subbase functional, time-varying channel pulses are applied to each of the subbases. The method conventionally used for generating such channel pulses is to generate channel pulses for the number of channels required in a common section, and then
Either distributed to each communication path, or generating temporally shifted basic communication path pulses in a common part by the number of installed communication path boards, and each communication path board transmits these basic communication path pulses through a shift register. A method has been adopted in which a plurality of channel pulses are generated by using and further shifting the channel pulses. However, in such a system, if the number of communication paths mounted on the communication base per unit is small, the number of communication path pulses generated in the common section becomes relatively large. This means that the device occupies a large amount of wiring space for mounting, and has become a major constraint for realizing miniaturization of the device.

An object of the present invention is to eliminate the above-mentioned drawbacks and reduce the wiring space connecting the common part and a plurality of communication bases by providing only a common control signal generation function in the common part of the device. The object of the present invention is to provide a possible channel pulse generation method for PCM communication system.

According to the present invention, in order to form a time-division multiplexed communication path in PCM communication, in a method of generating time-different communication path pulses to be supplied to a plurality of communication path bases respectively, a common A load pulse generation circuit and a clock pulse generation circuit are provided in the circuit board, and a counter circuit and an address circuit for specifying the mounted communication path position are respectively provided for each of the plurality of communication path boards. Each counter circuit is
After receiving the load pulses from the load pulse generation circuit all at once and loading them into the addresses specified by the respective address circuits,
A PCM characterized in that a counting operation is performed by pulses from the clock pulse generation circuit.
A communication path pulse generation system is obtained.

Next, a channel pulse generation method according to the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention in relation to a one-way roadbed. In the figure, a load pulse generation circuit 1 and a clock pulse generation circuit 2 are housed in a common part so that they can be used commonly for all roadbeds, and a counter 3,
D-type flip-flops 4, 5, 6 and changeover switch 8 are included in the same manner for a plurality of communication bases. Further, the position designation address circuit 7 corresponds to the mounting position of the communication base,
are provided in connection with each communication roadbed,
Appropriate address signals are applied to the communication base.
The position address signal S1 from the position specifying address circuit 7 specifies the address at which the counter 3 is loaded in order to determine the time position of the communication path handled by the corresponding communication path board, and also, Position address signal S2 is provided by changeover switch 8
This gives instructions as to whether or not to switch.

The operation of the above embodiment will be explained below with reference to the time chart of FIG. The output of the load pulse generating circuit 1 is commonly supplied to all the roadbeds. Further, the counter 3 is designed so that a pulse can be obtained at the output after n counts, assuming that the maximum count number is n. Now, for the four communication bases A, B, C, and D, communication base A has address (n-1), communication base B has address (n-3),
Position address signals S1a, S1b, S1c and S1d are sent to the respective position designating address circuits 7 so as to designate address (n-5) for communication base C and address (n-8) for communication base D, respectively.
It is given from a, 7b, 7c, and 7d. Here,
Symbols a, b, c and d indicate communication bases A, B,
Symbols corresponding to C and D shall be added to the symbols indicating their respective functions. On the other hand, assuming that the position address signal S2c is given only to the communication base C, the counters 3a, 3b, 3c, and 3d of each communication base A, B, C, and D receive the common load pulse Pl. Then, all addresses (n-1), (n-3), (n
-5) and (n-8). next,
Each of the counters 3a, 3b, 3c, and 3d starts counting by the clock pulse Pc from the clock pulse generating circuit 2, which is commonly applied to all the communication bases. In that case, as shown in FIG. 2, on the communication base A, the counter 3a only counts one at time (t+1) and extracts the output from the final stage, and then the flip-flop 4a outputs the output from the final stage at time (t+2). The flip-flop 5a operates at time (t+3). As a result, time (t+
2) to terminal T1a, and at time (t+3) to terminal T2.
A communication path pulse is generated at a. Similarly, in communication roadbed B, communication path pulses are obtained at terminal T1b at time (t+4) and at terminal T2b at time (t+5), and in turn, communication path pulses are obtained at time shifts at communication roadbeds C and D. is obtained. here,
In the communication base C, the position address signal S2c
The changeover switch 8c operates, and the time (t+
At step 8), the output from the D-type flip-flop 6c is obtained as a channel pulse at the terminal T2c.

As can be seen from the above description of operation, it is generally possible to generate channel pulses selectively shifted by one bit by means of additional circuitry such as the D-type flip-flop 6 and changeover switch 8. , if only continuous channel pulse generation is desired, the D-type flip-flop 6 and changeover switch 8 are unnecessary.

FIG. 3 shows a specific circuit example of the counter 3 shown in FIG. 1, taking as an example the case where the maximum count number n=16. In this figure, 30-1
30-4 are selector circuits for selecting address inputs, 31-1 to 31-3 are selector circuits for counter increment, and 32-1 to 32-4 are connected in series via selectors 31-1 to 31-3, respectively. 33 is an OR circuit for taking out the output. According to this example, a 4-bit signal (for example, "0011") forming the position address signal S1 is sent from the position specifying address circuit 7 to the terminals T _S1-1 , T S1-2, T _S1-2 ,
Selector circuit 30-1 via T _S1-3 and T _S1-4
~30-4 is given to one input terminal A. The load pulse Pl from the load pulse generation circuit 1 is sent to the selector circuits 30-1 to 30-1 through the input terminal T _Pl .
-4 and control terminals S of selector circuits 31-1 to 31-3. The clock pulse P _c of the clock pulse generation circuit 2 is applied to the clock input terminal CK of the flip-flop 32-1 and the input terminal B of the selector circuits 31-1 to 31-3 via the terminal T _Pc , and the first stage flip-flop 32-1 receives the clock pulse. Therefore, the flip-flops 32-2 to 32-4 in the next stage and below are directly driven by the output of the previous flip-flop selected by the selector circuits 31-1 to 32-3, respectively, by the clock pulse. Each selector circuit selects the input of terminal A only when the load pulse Pl is applied to the control terminal S, and otherwise selects the input of terminal B.
Select input. According to such a circuit, when the counter inputs the address specified by the address signal S1 and receives the load pulse Pl, it starts counting from that address by the clock pulse Pc,
At the maximum count point, an output pulse is available at the output terminal T _put .

As is clear from the above description, according to the present invention, by supplying a small number of common control information and individually different temporal position information to each communication base, communication between the common part and each communication base is achieved. It is possible to efficiently obtain communication path pulses with extremely little wiring between
It becomes possible to realize a PCM communication device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention in relation to a one-way roadbed, FIG. 2 is a time chart for explaining the operation of the embodiment of FIG. 1, and FIG. 2 is a diagram showing a specific circuit example of the counter shown in FIG. 1. FIG. In the figure, 1 is a load pulse generating circuit, 2 is a clock pulse generating circuit, 3 is a counter, 4, 5, and 6 are D type flip-flops, 7 is a position specifying address circuit, and 8 is a changeover switch.

Claims (1)

[Claims] 1. In a method for generating time-differentiated communication path pulses to be supplied to a plurality of communication bases respectively in order to form a time-division multiplex communication path in PCM communication, a load pulse generation circuit is commonly used for the plurality of communication bases. and a clock pulse generation circuit, and a counter circuit having an equal value when counted up and an address circuit for specifying a mounted communication path position corresponding to each of the plurality of communication path boards. Then, each of the counter circuits receives the load pulses from the load pulse generation circuit all at once, and is loaded with the value corresponding to the address designated by each of the address circuits as the counting start value, and then A communication line pulse generation method for PCM communication system, which is characterized in that a count operation is performed by pulses from a clock pulse generation circuit, and an output is output when the count is up.