JPH07123246B2 - Cable broadcasting telephone system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-line subscription type cable broadcasting telephone system for performing broadcasting and telephone communication.

[0002]

2. Description of the Related Art A cable broadcasting telephone is one that is used for communications other than cable broadcasting, using a cable telecommunications facility for carrying out cable broadcasting business and a handset attached to it.
It is used as a public communication institution that has both local public relations and telephone calling functions in rural fishing villages.

A conventional single line subscription type cable broadcasting telephone system is, for example, as follows.

On the subscriber side, a telephone and a speaker branch-connected to one subscriber line (two-line type) are installed. As the speaker, one that operates only when a broadcast flows according to the polarity of the voltage applied to the subscriber line is used.
In the exchange that accommodates the terminal of the subscriber line, as a connection destination of the subscriber line terminal, the line between the subscriber line terminal that outputs the broadcast signal to the subscriber line and the subscriber line terminal in order to talk with other subscribers. There are two systems of call paths for connection of the above, and the switching controller of the exchange switches the connection with the subscriber line to either the broadcast path or the call path. Since DC voltages of different polarities are applied to the communication channel and the broadcasting channel, the polarity of the DC voltage applied to the subscriber line is also switched according to the switching. Therefore, the polarity of the DC voltage applied to the subscriber's line is reversed during a call and during broadcasting, and the speaker operates only during broadcasting. During broadcasting, only the speaker or the telephone and the speaker if the telephone is off-hook is used. The broadcast sound is sent from and the speaker does not operate because the polarity applied to the subscriber line is reversed and the speaker does not operate at the time of a call. Therefore, the call voice is exchanged between the connected telephones without leaking from the speaker.

However, since the exchange uses one line by switching over time, it was not possible to make a call during broadcasting.

Therefore, although it is of the joint subscription system,
As an example of a cable broadcasting telephone device for making a call during broadcasting,
A cable broadcasting telephone device has been proposed in which two lines are connected to a subscriber, and when a call is made during broadcasting, one of the two lines is used for broadcasting and the remaining one line is used to make a call ( For example, Japanese Patent Laid-Open No. 2-190993).

[0007]

Among the above-described conventional cable broadcasting telephone devices, the one for switching between a call and a broadcast output cannot make a call when a broadcast is being output. There is a problem that the call is forcibly cut off when the emergency broadcast starts while performing.

In the case where the number of lines up to the subscriber is two, the number of lines required is doubled, and when using the existing cable broadcasting telephone device, it cannot be used as it is. .

The present invention has been made in view of the problems of the above-mentioned conventional technique, and an object thereof is to provide a cable broadcasting telephone device that can simultaneously perform broadcasting and telephone call economically.

[0010]

Means for Solving the Problems] cable broadcasting telephone system of the present invention, respectively corresponding to a plurality of subscriber lines to accommodate the telephone and a speaker, a subscriber circuit and provided individually for each subscriber times line A cable broadcasting telephone system of a single line subscription method for making a call and a broadcast by using a switching control unit , which is provided for each of the plurality of switching control units and a trunk for outputting broadcast contents supplied from broadcasting equipment,
A polarity switching circuit that switches the polarity of the trunk output and sends it to the switching control unit, detects an off-hook of the telephone and monitors the trunk output, controls the operation of the polarity switching circuit, and connects the subscriber lines to the subscriber line. A switching control unit for connecting to each of the subscriber circuits and the polarity switching circuit, and the polarity of the voltage of the subscriber line to the subscriber circuit.
That operates when the output of the other circuit is different
; And a mosquito, the switching control unit, an off-hook is not detected in the telephone, and the when the trunk output is input, connect the polarity switching circuit to the subscriber line the polarity of the broadcast signal When the off-hook of the telephone is detected and the trunk output is not input, the subscriber circuit is connected to the subscriber line, and the off-hook of the telephone is detected. When the trunk output is input, the polarity switching circuit is controlled to switch the polarity of the broadcast signal to the same polarity as that of the subscriber circuit, and the subscriber circuit and the polarity switching circuit are connected to the subscriber. The feature is that the line is continuously switched and connected.

[0011]

In the cable broadcasting telephone system of the present invention, when the subscriber is not making a telephone call, the switching control section connects the subscriber line and the polarity switching circuit, and the output of the polarity switching circuit is the speaker. Since the voltage polarity is such that it operates, broadcast contents are sent from the speaker. For broadcasting when a subscriber is making a telephone call, the switching control unit continuously connects the subscriber line to the subscriber circuit and the polarity switching circuit. Since the polarity is maintained during the call, the broadcast content is sent out only from the handset of the telephone without leaking the call content from the speaker.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a cable broadcasting telephone system according to an embodiment of the present invention.

The exchange 1 has a speech path switch 5, a plurality of subscriber circuits 4 connected to the speech path switch 5, and a switching control section 2 provided for each subscriber circuit 4.
And a contact 3 provided in each switching control unit 2,
A trunk 6 that is connected to an externally installed broadcasting facility 7 and outputs the broadcast content of the broadcasting facility 7 with a polarity different from that of the subscriber circuit 4, and a polarity switching provided in each switching control unit that is connected to the trunk 6. A circuit 11 and a subscriber line 8 connected to the contact 3 are provided for broadcasting and calling services to the subscribers.

On the other hand, on the subscriber side, a telephone 9 and a speaker 10 are branch-connected to a one-line (two-wire type) subscriber line 8, and a contact 3 in the switching control unit 2 is connected via the subscriber line 8.
Connected to.

The broadcasting facility 7 outputs a broadcasting signal indicating broadcasting contents to the trunk 6 of the exchange 1. The trunk 6 is provided with a switching control unit 2 provided with a plurality of broadcast signals according to the number of subscribers.
It is sent to the polarity switching circuit 11 in the same broadcast. Polarity switching circuit 1
1 receives the control of the switching control unit 2 as will be described later, switches the polarity of the broadcast signal and sends it to the contact 3. Speaker 1
0 is from the broadcasting equipment 7 to the trunk 6, the polarity switching circuit 11,
It is for amplifying the broadcast signal sent through the contact 3 and the subscriber line 8 and outputting the broadcast content.
It operates only when the polarity of the voltage on the subscriber line 8 is predetermined.

The telephone 9 is a commonly used telephone. The subscriber circuit 4 sends a busy tone, a calling signal, etc. to the telephone 9. The contact 3 connects the subscriber line 8 to either the subscriber circuit 4 or the polarity switching circuit 12 and performs switching. Although not shown, the switching control unit 2 has a circuit that detects an off-hook of the telephone 9 and a circuit that detects the presence or absence of a broadcast signal, and controls the switching operation of the contact 3 and the polarity switching unit 11 based on the result. Call path switch 5
Are connected to a plurality of subscriber circuits 4, and during a call, the subscriber circuits 4 are mutually connected.

The subscriber line 8 is connected to the subscriber circuit 4 and the polarity switching circuit 11 at the contact 3 so that the polarity of the voltage of the subscriber line 8 is inverted when the switching control unit 2 switches the contact 3. To do. Further, the speaker 10 has contact points 3
Is attached so as to operate when the switch is switched to the polarity switching circuit 11 side.

Next, the operation of this embodiment will be described.

First, the call operation when broadcasting is not being performed will be described. When neither broadcasting nor calling is being performed, the contact 3 is switched to the subscriber circuit 4 side, and a normal telephone system is used. The same call operation is performed. Therefore, since the speaker 10 does not operate, the call between the subscribers can be performed without leaking the call content from the speaker. .

The broadcasting operation when no telephone call is made, that is, when the telephone 9 is not off-hook will be described.

The broadcast signal indicating the broadcast transmitted by the broadcasting facility 7 is transmitted to the contact 3 via the trunk 6 and the polarity switching circuit 11. When the circuit for detecting the presence / absence of a broadcast signal in the switching control unit 2 detects the broadcasting signal and the circuit for detecting the off-hook cannot detect the off-hook, the switching control unit 2 monitoring this detection result is Control 3
The polarity switching circuit 11 and the subscriber line 8 are connected. As a result, the polarity of the subscriber line 8 is reversed and the speaker 10 operates.

With the above operation, the broadcast signal is output from the speaker 10 as a broadcast.

Next, consider the case where broadcasting starts while the subscriber is off-hook on the handset, such as during a call.

The fact that the handset is off-hook is known in advance from the result of the off-hook detection circuit in the switching control unit 2. Upon receiving the broadcast signal in this state, the switching control unit 2 controls the contact 3 to continuously switch the connection between the subscriber line 8 and the subscriber circuit 4 or the polarity switching circuit 11, and to switch the polarity switching circuit 11 It is controlled to keep the polarity of the DC voltage applied to the subscriber line 8 inverted during the broadcast time. That is, even when the contact 3 is continuously switched and the subscriber line 8 and the polarity switching circuit 11 are intermittently connected, the polarity of the DC voltage applied to the subscriber line 8 is the polarity during the call. Is maintained.

Therefore, the broadcast signal is intermittently mixed into the subscriber line 8 and the speaker 10 is used until the broadcast ends.
Is prohibited, and the subscriber can listen to the broadcast even if the call is not leaked from the speaker 10.

In the above conventional example, a circuit for detecting the off-hook of the telephone 9 is provided in the switching control unit 2.
Since the subscriber circuit 4 also normally detects off-hook, this may be used.

[0028]

Since the present invention is constructed as described above, it has the following effects.

When a subscriber is making a telephone call, the broadcast contents are intermittently mixed and transmitted from the handset, and the output from the speaker is prohibited. Even on the line, the telephone subscriber has the effect of being able to talk while listening to the broadcast.

[Brief description of drawings]

FIG. 1 is a connection diagram showing an embodiment of the invention.

[Explanation of symbols]

 1 Switchboard 2 Switching control section 3 Contact point 4 Subscriber circuit 5 Call path switch 6 Trunk 7 Broadcast facility 8 Subscriber line 9 Telephone 10 Speaker 11 Polarity switching circuit

Claims (2)

[Claims] 1. A single line, each corresponding to a plurality of subscriber lines to accommodate the telephone and a speaker, performs call and broadcast using a subscriber circuit and the switching control unit provided separately for each subscriber times line A subscriber type cable broadcasting telephone system, wherein a trunk for outputting broadcast contents supplied from a broadcasting facility and a plurality of switching control sections are provided for each of the switching control sections and the polarity of the trunk output is switched to be sent to the switching control section A polarity switching circuit for detecting the off-hook of the telephone and monitoring the trunk output, and controlling the operation of the polarity switching circuit and connecting each of the subscriber circuits to the subscriber circuit and the polarity switching circuit. A switching control unit for making a connection, and the polarity of the voltage of the subscriber line is the output of the subscriber circuit.
A speaker that operates when different from each other, and the switching control unit connects the polarity switching circuit to the subscriber line when the off-hook of the telephone is not detected and the trunk output is input. and is different polarity to the polarity of the subscriber circuit the polarity of the broadcast signal, the off-hook of the telephone set is detected, and the when the trunk output is not input, to connect the subscriber circuit to the subscriber line, When the off-hook of the telephone is detected and the trunk output is input, the polarity switching circuit is controlled to switch the polarity of the broadcast signal to the same polarity as the subscriber circuit, and the subscriber circuit and Single line subscription type cable broadcasting characterized in that the polarity switching circuit is continuously switched and connected to the subscriber line. Talk system. 2. The cable broadcasting telephone system according to claim 1, wherein the output of the trunk has a polarity different from that of the subscriber circuit.