JP2699627B2 - Cable broadcasting telephone system - Google Patents

Description

The present invention relates to a cable broadcast telephone system.

[Conventional technology]

In a conventional cable broadcasting telephone system, a cable broadcasting telephone speaker is connected to a cable broadcasting telephone exchange via a pair of lines,
In addition, the telephone is also configured to be connected in a branch.

[Problems to be solved by the invention]

In the above-described conventional cable broadcasting telephone system, the cable broadcasting telephone speaker is connected to the cable broadcasting telephone exchange via a pair of lines, and the telephone is also connected in a branch. There is a drawback that you cannot listen and cannot talk during the broadcast. In particular, if the person has an urgent character during the broadcast, there is a problem that the call cannot be made, and the broadcaster has a drawback that the subscriber can only listen to one type of broadcast from the headquarters.

[Means for solving the problem]

The wired broadcast telephone system according to the present invention includes an independent line speaker unit including a broadcast speaker on the subscriber side, an independent line adapter provided in a wired broadcast telephone exchange, and the independent line adapter and the independent line speaker unit. Are connected by two lines, a first line and a second line, and a telephone is connected to the independent line speaker unit. The independent line adapter is connected to the second line via the telephone and the independent line speaker unit.
And a first switching means for switching to output a broadcast of a type corresponding to the push button signal to the second line when a push button signal from the telephone is detected by connecting via the line. The unit normally outputs the broadcast from the first line, connects the second line to the telephone, and detects that there is a broadcast output from the independent line adapter on the second line, and outputs the first line. There is provided second switching means for switching from the line broadcast to the second line broadcast.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

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

In FIG. 1, this embodiment is an exchange 1 for a cable broadcast telephone.
The A line 3 and the B line 4 are connected to the independent line speaker unit 5 on the subscriber side from the independent line adapter 2 built in the telephone line. Are output via a power amplifier 8 and are multi-connected to a plurality of independent round speaker units 5 by a multi-circuit 9.

The independent line speaker unit 5 connects the A line 3 of the output of the power amplifier 8 to the external speaker 10 by the switching circuit 15 and the B line 4 to the telephone 11 so that the broadcast and the call function independently. A polarity inversion detection circuit 14 for detecting the inversion of the polarity of the line 4, an amplifier 16 for amplifying the signal on the B line 4, an external speaker 10, and a switching circuit 15 switched by the inversion detection signal of the polarity inversion detection circuit 14. Have.

Independent line adapter 2 is connected to telephone 11 via B line 4.
And a switching circuit 13 for connecting the B line 4 to one of various broadcast output lines 7 from the broadcast sound source 6 in accordance with the detection signal of the detector 12.

 Next, the operation of the present embodiment will be described.

When a subscriber of the telephone set 11 listens to a desired broadcast during idle time, if a push signal is sent by pressing the dial of the telephone set 11, it is detected by the detector 12 built in the independent line adapter 2 and corresponds to the content of the push signal. The various broadcast output lines 7 are switched and connected by the switching circuit 13 and output to the B line 4.
At the same time, the independent line adapter 2 reverses the polarity of the B line 4. The independent line speaker unit 5 detects the polarity inversion of the B line 4 by the polarity inversion detection circuit 14, switches the switching circuit 15 to the B line 4 side, and outputs the broadcast output from the B line 4 to the amplifier 16.
Through the external speaker 10.

When an emergency broadcast is being output to the A line 3, the independent line adapter 2 does not receive a push signal.

The independent line speaker unit 5 normally connects the A line 3 of the output of the power amplifier 8 to the external speaker 10 by the switching circuit 15, and performs a call by the telephone 11 connected to the B line 4 and a broadcast by the external speaker 10. Function independently.

〔The invention's effect〕

As described above, the present invention provides an independent line speaker unit including a broadcast speaker on the subscriber side, an independent line adapter in a wired broadcast telephone exchange, and separates the independent line adapter and the independent line speaker unit. One line and the second line are connected to each other, and a telephone is connected to the independent line speaker unit. The independent line adapter is connected to the telephone via the second line via the independent line speaker unit and pushed from the telephone. When a button signal is detected, a first switching means for switching to output a broadcast of a type corresponding to the push button signal to the second line is provided, and the independent line speaker unit normally outputs the broadcast from the first line. , The second B line is connected to the telephone, and when it is detected from the independent line adapter that there is a broadcast output on the second line, the broadcast from the first line is changed to the second line. By providing the second switching means for switching to broadcasting, normal broadcasting, that is, emergency public broadcasting, can be heard even during a call, and at other times and when a subscriber makes a call. If not, the system can provide a system that allows the subscriber to listen to the desired broadcast if the subscriber requests it with a push button signal, so that the service to the subscriber can be enhanced more than before.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1 ... Switch for wired broadcast telephones 2 ... Independent line abpters 3 ... A line 4 ... B line 5 ... Independent line speaker unit 6 ... Broadcast sound source 7 ... Various broadcast output lines 8 Power amplifier, 9 Multi circuit, 10 External speaker, 11 Telephone, 12 Detector, 13, 15
Switching circuit, 14: polarity reversal detection circuit, 16: amplifier.

Claims (1)

(57) [Claims] An independent line speaker unit including a broadcast speaker is provided on a subscriber side, and an independent line adapter is provided in a cable broadcasting telephone exchange. The independent line adapter and the independent line speaker unit are connected to each other. A line and a second line, and a telephone is connected to the independent line speaker unit. The independent line adapter is connected to the telephone via the independent line speaker unit via the second line. When a push button signal from the telephone is detected, a first switching unit that switches to output a broadcast of a type corresponding to the push button signal to the second line is provided.
When the independent line speaker unit normally outputs a broadcast from the first line, connects the second line to the telephone, and detects that there is a broadcast output on the second line from the independent line adapter. A cable broadcasting telephone system, comprising: a second switching unit that switches from broadcasting on the first line to broadcasting on the second line.