JPH0369223B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wired broadcast telephone exchange, and more particularly to a central control unit having a serial transmission interface as a method for inputting broadcast audio output area designation.

The main functions of a wired broadcasting telephone exchange are two functions: interconnection between subscriber telephones, and output of broadcast audio to speakers built into or attached to subscriber telephones. When outputting broadcast audio, an audio signal is input from a separately installed broadcast control device, and it also controls the start and end of the broadcast.
Information about the area targeted for broadcasting is given, and based on that information, the exchange outputs audio from the subscriber circuit to each subscriber.

Information such as the broadcast start, end, broadcast area, etc. has conventionally been transmitted as parallel signals such as relay contacts. However, in recent years, more detailed services have been required for subscribers, and broadcasting areas have been subdivided, requiring control on a subscriber-by-subscriber basis, but conventional methods require a large number of input signals. This has led to an increase in the number of input circuits and signal transmission lines.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wired broadcast telephone exchange device that can input a large number of control signals for broadcast control using a simple input circuit and a small number of signal lines.

The main features of the present invention include a plurality of telephones, a subscriber circuit for detecting the hook of the telephone and outputting broadcast audio, and a call path switch and trunk circuit for connecting the subscriber lines. The central control circuit that controls the circuit is equipped with means for inputting and outputting serial data, and is capable of receiving control information from a broadcast control device.

According to the present invention, all control signals can be received using two serial transmission signal lines, and since the signal lines used in telephones can be used as the signal lines, the cost for wire materials can be greatly reduced. In addition, the configuration of the receiving circuit can be made extremely simple.

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

FIG. 1 is a block diagram of a wired broadcast telephone exchange apparatus according to an embodiment of the present invention. This telephone exchange equipment detects a large number of subscribers (or called telephones) 1, 2...3 each equipped with a speaker and a handset for transmitting broadcast audio, and detects the call status of each subscriber, and subscriber circuits 4, 5...6 for controlling the transmission of voice signals from 11, a communication path switch 7 for connecting lines, a calling register 8 for receiving dialing information, and a subscriber circuit 4, 5, . A trunk 9 within the local office that is necessary when the called party is located at another station, an outgoing/receiving trunk 10 that is connected when the called party is at another station, subscriber circuits 4, 5...6, a communication path switch 7, and each trunk circuit 8, 9. , 10, etc., and an I/O circuit 12 serving as an interface for the central controller 13, serial transmission modem (called a modem)
It is equipped with 14.

The central control device 12 includes a serial transmission input/output circuit, and in this configuration example, is a microcomputer.

The operation of the blocks of this configuration is substantially the same as that of a conventional telephone exchange, and therefore will not be described in detail.

FIG. 2 is a circuit block diagram of an embodiment of the present invention which describes the central control unit 13 of FIG. 1 in more detail.

The central control device 21 is a microcomputer, and the microcomputer package 1
7 and a serial output package 20 are connected by a data bus 22. The microcomputer package 17 is equipped with a microcomputer 15 (called a CPU) and a memory 16, and the serial input/output package 20 has a serial input/output circuit 18 and an interface circuit for connecting to a modem 24. 19 is mounted and connected to the modem 24 by an interface cable 23. An output signal line 25 from the modem is connected to a broadcast control device. The serial signal sent from the broadcast control device is demodulated by the modem 24, decoded by the serial input/output circuit 18 via the interface 19, and inputted to the CPU 15 as 8-bit data.

FIG. 3 is a block diagram showing the connection between a wired broadcast telephone exchange and a broadcast control device according to an embodiment of the present invention.

When broadcasting, the broadcast control device 36 connects the telephone exchange devices 28 and 29 using audio signal lines 37 and 38.
modem 3.
Serial transmission signal lines 32, 33 via 4, 35
Sends broadcast control data to. Telephone exchange equipment 2
8 and 29 receive control signals via modems 30 and 31, and transmit broadcast audio to subscriber telephones 26 and 27 in corresponding areas according to the content of the signals.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of a wired broadcast telephone exchange device, which is an embodiment of the present invention. FIG. 2 is a circuit block diagram showing the central control circuit of FIG. 1 in detail. FIG. 3 is a block diagram showing the connection between the telephone exchange device of FIG. 1 and the broadcast control device. In the figure, 1, 2, 3, 26, 27... subscribers, 4, 5, 6 subscriber circuits, 7... call path switch, 8... calling register, 9... trunk within own office, 10... Outgoing/receiving trunk, 11... Broadcast amplifier, 12... I/O circuit, 13, 21... Central control circuit, 14, 24, 30, 31, 34, 35...
...Modem, 15...CPU, 16...Memory section,
17...Microcomputer package, 18
... Serial I/O circuit, 19 ... Modem interface circuit, 20 ... Serial package,
22...Data bus, 23...Modem connection cable, 25, 32, 33...Serial transmission signal line,
37, 38...Audio signal line, 36...Broadcast control device, 28, 29...Cable broadcast telephone exchange.

Claims (1)

[Scope of Claims] 1. A plurality of telephones, a group of switches for connecting a line between one of the telephones and another telephone, and a broadcasting means for outputting broadcast audio to the telephone. and a broadcast audio input circuit from a broadcast control device, the cable broadcast telephone exchange device comprising a serial transmission means for transmitting and receiving data between the broadcast control device and the broadcast audio input circuit. When outputting the input broadcast audio to the telephone using the broadcasting means, the broadcast audio can be output only to some specific telephones among the telephones, and the classification of the specific telephones,
In other words, a cable broadcasting telephone exchange apparatus characterized in that it is configured such that a range of broadcast audio output can be specified using the serial transmission means.