JPS6027476B2 - Time division digital communication device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a time-division digital communication system in which communication such as data communication or digital voice communication between subscribers is performed using digital signals.

Time-division digital communication equipment performs communication by multiplexing communication channels, but in conventional time-division digital communication equipment, different times are assigned to the sending subscriber and the receiving subscriber (hereinafter, this allocated time is time is called a time slot). Therefore, in this device, when subscribers involved in a call are connected to the same common line, two time slots are required on this common line for one communication, so the multiplicity of communication is limited to the common line, that is, the communication path. There is a drawback that the multiplicity is 1/2. An object of the present invention is to use only one time slot for one communication when subscribers involved in communication are connected to the same common line, and to make the multiplicity of communication equal to the multiplicity of the communication path. An object of the present invention is to provide a split digital communication device.

The communication device of the present invention has a plurality of input terminals and a plurality of first exclusive OR circuits connected to each of the common line side output terminals of a subscriber circuit. the plurality of first exclusive OR circuits are connected in multiple stages such that the final stage is one first exclusive OR circuit, and the final stage is connected to any one input terminal of the exclusive OR circuit; a logic circuit configured to have the output terminal of the first exclusive OR circuit as an output terminal; a common line connecting the output terminal of the logic circuit to all the common line input terminals of the subscriber circuit; A second exclusive OR circuit is provided in the subscriber circuit and receives the transmitted digital signal of the subscriber circuit itself and the digital signal distributed by the common line, and outputs an output signal to the subscriber side. There is.

Next, the present invention will be explained in detail using the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In FIG. 1, the communication device of the present invention includes subscriber circuits 1 and 2.
, 3, 4 and 5, input terminals 6, 7, 8, 9 and 10 connected to the output terminals of these subscriber circuits, and a common line 17.
An output circuit 16 connected to all the input terminals of these subscriber circuits, an exclusive OR circuit 12 having the input terminals 6 and 7 as two inputs, and an exclusive OR circuit 12 having the input terminals 8 and 9 as two inputs. OR circuit 13 and exclusive OR circuit 1
an exclusive OR circuit 14 whose two inputs are the output of 3 and the input of the input terminal 10; and exclusive OR circuits 12 and 14.
The logic circuit 11 has an exclusive OR circuit 15 whose output is supplied to an output terminal 16 and whose output is supplied to an output terminal 16.

In addition, the subscriber circuit described here is a circuit that converts a 2-wire signal from a subscriber into a 4-wire signal, limits the band, performs analog-to-digital conversion, and outputs the resulting digital signal in a voice digital communication device. In a circuit or data communication device that inputs a digital signal, performs digital-to-analog conversion, demodulates and regenerates the obtained analog signal, converts it into a two-wire signal, and sends it to the subscriber. Each subscriber is equipped with a circuit that converts the data signal into a digital signal (for example, converts it into a digital code through sampling) and outputs it, and also reproduces the digital signal and sends it to the receiving subscriber terminal. Refers to a circuit that inputs and outputs digital signals by dividing them. FIG. 2 is a diagram showing a subscriber circuit used in this embodiment.

In FIG. 2, the subscriber circuit 18 has an output terminal 25 and an input terminal 26, and a modulation/demodulation circuit 19 and a modulation/demodulation circuit 1.
A transmitting gate 21 whose one input terminal is connected to the output terminal of the modulation/demodulation circuit 19 and whose output terminal is connected to the output terminal 25, a receiving gate 22 whose one input terminal is connected to the input terminal 26, and the output terminal of the modulation/demodulation circuit 19 and the receiving gate 22, and an exclusive OR circuit 20 having two input terminals connected to each output terminal and an output terminal connected to an input terminal of a modulation/demodulation circuit 19. Communication between subscriber circuits 1 and 4 using this device will be explained.

The digital signals A and B output to the respective modulation/demodulation circuits 19 of the subscriber circuits 1 and 4 are transmitted to both gates by applying a gate signal to one input terminal 23 of the transmission gate 21 of both subscriber circuits at time slot T. are opened and output to the respective output terminals 25. At the time slot T, the digital signal A of the subscriber circuit 1 is input to the input terminal 6, and the digital signal B of the subscriber circuit 4 is input to the input terminal 9. At this time, since the transmission gates 21 of the other subscriber circuits 2, 3, and 5 are closed, the input terminals 7, 8
The logic level of and 10 is "0". Therefore, the output signal of the exclusive OR circuit 12 is A, the output signal of the exclusive OR circuit 13 is B, and the output signal of the exclusive OR circuit 14 is B. Then, the output signal C of the exclusive OR circuit 15
becomes from A to B (=A.B+A.B), and is output to the output terminal 16. This digital signal C output to the output terminal 16 is distributed to each subscriber circuit via the common line 17 at the time slot T. In the subscriber circuit 1, by applying a gate signal to the input terminal 24 of the receiving gate 22 at the time slot T, the receiving gate 22 is opened and the digital signal C is input. Exclusive OR circuit 2
Kawama receives the digital signal A outputted by the modulation/demodulation circuit 19 and the digital signal C inputted from the logic circuit 11, and restores the digital signal B of the subscriber circuit 4 by logic operation so that A=B, that is, the digital signal B of the subscriber circuit 4. Output. On the other hand, the digital signal C is similarly input to the subscriber circuit 4 at the time slot T, and the digital signal A of the subscriber circuit 1 is restored. FIG. 3 is a diagram showing another example of the logic circuit used in this embodiment.

In FIG. 3, the logic circuit 27 has input terminals 32 to 36 connected to the common line side output terminal of the subscriber circuit, and an output terminal 37 connected to all the common line side input terminals of the subscriber circuit via the common line 17. 2 to the input terminals 32 and 33.
an exclusive OR circuit 28 with two input terminals connected to it, and an exclusive OR circuit 2 with one input terminal connected to the input terminal 34;
an exclusive OR circuit 29 whose output terminal is connected to the other input terminal, and an exclusive OR circuit 30 whose one input terminal is connected to the input terminal 35 and whose other input terminal is connected to the output terminal of the exclusive OR circuit 29. and an exclusive OR circuit 31 whose one input terminal is connected to the input terminal 36, the other input terminal is connected to the output terminal of the exclusive OR circuit 30, and whose output terminal is connected to the output terminal 37.

FIG. 4 is a diagram showing still another example of the logic circuit used in this embodiment.

In FIG. 4, the logic circuit 38 has input terminals 43 to 47 connected to the common line side output terminal of the subscriber circuit, and an output terminal 48 connected to all the common line side input terminals of the subscriber circuit via the common line 17. Exclusive OR circuits 39 and 40 having two input terminals connected to input terminals 43 and 44 and input terminals 45 and 46, respectively, and exclusive OR circuit 3
An exclusive OR circuit 41 has two input terminals connected to the output terminals 9 and 40, one input terminal is connected to the output terminal of the exclusive OR circuit 41, the other input terminal is connected to the input terminal 47, and the output terminal is It consists of an exclusive OR circuit 42 connected to an output terminal 48.

As described above, according to the present invention, bidirectional communication can be performed in one time slot.

In the present invention, compared to conventional communication devices, if the multiplicity of the common line is the same, twice the communication multiplicity can be obtained, so the device can be used efficiently, and there is a great benefit in making the device smaller and more economical. has.

[Brief explanation of drawings]

FIG. 1 is a diagram showing one embodiment of the present invention, FIG. 2 is a diagram showing a subscriber circuit used in this embodiment, and FIGS. 3 and 4 are diagrams showing another example of a logic circuit used in this embodiment. It is. 1 to 4, 1 to 5 are subscriber circuits, 11,
27 and 38 are logic circuits, 12 to 15, 20, 28 to 3
1 and 39 to 42 are exclusive OR circuits, 17 is a common line, 1
Reference numeral 9 indicates a modulation/demodulation circuit, and 21 and 22 indicate gates. Leopard Figure Leopard Figure 3 Figure 4

Claims (1)

[Claims] 1 comprising a plurality of input terminals connected to each of the common line side output terminals of the subscriber circuit and a plurality of first exclusive OR circuits, each of the input terminals being connected to one of the plurality of first exclusive OR circuits; one of the plurality of input terminals and the plurality of first input terminals.
Exclusive OR circuits are connected in multiple stages such that the final stage is one first exclusive OR circuit, and the output terminal of the first exclusive OR circuit in the final stage is used as the output terminal. a common line connecting the output terminal of the logic circuit, the output terminal of the subscriber circuit, and all the common line side input terminals of the subscriber circuit; and a common line provided in each subscriber circuit that connects the subscriber circuit itself. and a second exclusive OR circuit which receives the transmitted digital signal and the digital signal distributed by the common line and outputs an output signal to the subscriber side.