JPH0267097A - Subscriber line concentration system for time division telephone exchange - Google Patents

Abstract

PURPOSE:To realize a subscriber line concentration function without providing a subscriber line concentration switch separated independently from a subscriber circuit by performing the dual connection of the input and output sides of the digital signals of plural subscriber circuits having functions for A/D conversion and D/A conversion, respectively. CONSTITUTION:An analog voice signal transmitted from a subscriber line 8, after being converted to a digital voice signal of eight bits, is accumulated in a buffer(BF) 5 transiently. A control circuit 7, when receiving a command from a host device from a control signal bus 12 via a control signal path 11, sends the digital voice signal accumulated in the BF 5 to an arbitrary channel on a digital voice signal bus 13 on the output side via a digital voice signal path 9 on the output side. In such a way, signals from N subscriber circuits set more than the number of channels of the digital voice signal buses 13 and 14 on the input and output sides are line-concentrated on the channels of the digital voice signal buses 13 and 14 on the input and output sides selected by the command from the outside.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a subscriber concentration system for a time division telephone exchange.

[Conventional technology]

Conventionally, as subscriber line concentration systems for time-division telephone exchanges, there are known analog line concentration systems using electronic switches separate from subscriber circuits and digital line concentration systems using memory switches.

[Problem to be solved by the invention]

In the above-mentioned conventional subscriber line concentration systems, both analog and digital line concentration systems require the use of a line concentration switch that is separate and independent from the subscriber circuit, making control of the line concentration switch complicated, and This has the disadvantage of increasing the scale of the peripheral circuitry.

[Means to solve the problem]

In the subscriber line concentration system of the time-division telephone exchange of the present invention, each subscriber circuit converts an analog voice signal from the subscriber into a digital voice signal using an A-D converter, temporarily stores the signal, and then converts the analog voice signal from the subscriber into a digital voice signal according to an external command. means for sequentially transmitting to the network side at a time; and means for extracting a digital audio signal from the network at a time according to an external command, converting it into an analog audio signal by a D-A converter, and transmitting the analog audio signal to the subscriber side. , and the input and output sides of the digital audio signals of the plurality of subscriber circuits are connected in a duplex manner.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In FIG. 1, a subscriber circuit 1 includes a BOR3HT circuit (hereinafter referred to as BOR3HT) 2. A-D converter (hereinafter referred to as A-D)3.
D-A converter (hereinafter referred to as D-A) 4°-hour storage circuit (hereinafter referred to as B
F) 5.6 and its control circuit (hereinafter referred to as CTL) 7. The output of BF5 is connected to an output digital audio signal bus 13 consisting of a plurality of channels via an output digital audio signal path 9, and the input of BF6 is connected to an input digital audio signal bus 13 consisting of a plurality of channels via an input digital audio signal path 10. Connected to bus 14.

Next, the operation of this embodiment will be explained.

The analog voice signal transmitted from subscriber line 8 is BORS
An 8-bit digital signal is obtained by A-D3 via HT2. When the CTL 7 receives a command from a host device (not shown) from the control signal bus 12 via the control signal path 11, the CTL 7 converts the digital audio signal stored in the BF 5 into an output digital audio signal via the output digital audio signal path 9. It is sent to an arbitrary channel on the signal bus 13. Also, CTL
7 is the incoming digital audio signal bus 14 according to a similar command.
The above arbitrary channel is extracted via the incoming digital audio signal path 10 and temporarily stored in the BF6. The digital voice signal of BF6 is sequentially converted into an analog voice signal by DA4 and transmitted to subscriber line 8 via BORSHT2.

Here, the output side and input side digital audio signal bus 13.14
are connected to output and input digital audio signal paths 9 and 10 of a plurality of subscriber circuits 1 to N, respectively. Out side,
Signals from N subscriber circuits set to be larger than the number of channels on the incoming digital audio signal bus 13.14 are sent to the outgoing and incoming digital audio signal buses 13.14, which are selected by an external command. The lines will be concentrated in the channel.

〔Effect of the invention〕

As explained above, the present invention provides A-D conversion, D conversion,
- By connecting the incoming and outgoing sides of digital audio signals of multiple subscriber circuits with A conversion function in multiple ways, subscriber line concentration is possible without installing a separate or independent subscriber line concentration switch from the subscriber circuits. Since the functions can be realized, there is an effect that the subscriber line concentration function and peripheral circuits can be miniaturized.

D), 4...DA converter (DA), 5.6...
- Time accumulation circuit (BF), 7... control circuit (CTL),
8... Subscriber line, 9... Outgoing digital audio signal path, 10... Incoming digital audio signal path, 11... Control signal path, 12... Control signal bus, 13... Outgoing digital audio signal bus, 14... Incoming digital audio signal bus.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention.

Claims (1)

[Claims] Each subscriber circuit receives analog voice signals from the subscriber from A to D.
A means for converting the digital audio signal into a digital audio signal by a converter, temporarily storing it, and sequentially transmitting it to the network side at a time specified by an external command; and a means for extracting the digital audio signal from the network at a time specified by an external command; A
and means for converting the digital audio signal into an analog audio signal using a converter and transmitting it to the subscriber side, and is characterized in that the input side and output side of the digital audio signal of the plurality of subscriber circuits are connected in multiple ways, respectively. A subscriber concentration system for time-division telephone exchanges.