JPH079477Y2 - Switching circuit for transmitting and receiving circuits - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a switching circuit for a transmission / reception circuit such as a coin-operated telephone in which a part of communication is restricted.

[Conventional technology]

In the case of a coin-operated telephone in which a part of the call is restricted, such as a telephone used under the restriction of the use of free special numbers, the conventional use of the transmitter is restricted and only the other party's voice is received. There was one that had a one-way call function to let you hear from.

[Problems to be solved by the device]

However, in the conventional telephone of this type having the one-way call function, there is a drawback in that the voice can be communicated to the other party if the user speaks out loud from the earpiece.

The present invention solves the drawbacks of the above-mentioned telephone and provides a small and simple switching circuit for a transmission / reception circuit which prevents the other party from talking even if a loud voice is spoken from the earpiece.

[Means for Solving the Problems]

In order to solve the above problems, the present invention provides a switching circuit for a transmission / reception circuit of a public telephone, which limits a part of a call when calling a free special number such as number guidance, and a circuit which outputs a signal when coins are inserted into the public telephone. And a relay having first and second switching circuits that are connected in series with the circuit and are driven by a signal from the circuit and that continue to operate until a response signal of the called party arrives; One end of the receiver terminal of the receiver circuit is disconnected and connected to the common terminal side of the first switching circuit of the relay, and the make contact closed by the relay operation and the common terminal of the second switching circuit of the relay. And a voice signal suppressing resistor having a predetermined value for suppressing a voice signal output from the handset, and a voice signal path coil having a predetermined value connected in series with the resistor. The capacitor and one end of the transmitter of the transmitter / receiver circuit are separated from the first transmitter attachment terminal, the first terminal is connected to the common terminal of the second switching circuit of the relay, and One end of the separated transmitter is connected to the break contact of the second switching circuit of the relay, the other end of the transmitter is connected to the second transmitter mounting terminal, and the second of the relay is connected. And a dummy resistor for a transmitter connected between the make contact of the switching circuit of FIG.

[Action]

As described above, the disadvantage of the telephone having the one-way communication function can be solved by constructing a small size of the switching circuit for the transmission / reception circuit of the money input type telephone or the like and adding it to the circuit of the telephone or the like.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a circuit configuration diagram of an embodiment of the present invention, and FIG. 2 is a connection diagram of the embodiment of the present invention and a coin-operated telephone. In FIG.
1 is a transmission / reception circuit switching circuit, 2 is a relay S, 3 is P1
Terminals 4 are P2 terminals. The relay S2 is connected to the P1 terminal 3 and the P2 terminal 4. Reference numeral 5 is a contact SS1 of the relay S, 6 is a contact SS2 of the relay S, 7 is a voice signal suppressing resistor VR1, 8 is a dummy resistor RD for a transmitter, 9 is a voice signal path capacitor C1, 10
Is P3 terminal, 11 is P4 terminal, 12 is P5 terminal, 13 is P6 terminal, 14 is
This is the P7 terminal.

The relay S2 has contacts SS1,5 and contacts SS2,6.
The contacts SS1,5 connected to the P5 terminal 12 switch the connection line from the P3 terminal 10 and the connection line of the audio signal path capacitors C1,9 and the audio signal suppression resistors VR1,7 connected in series from the P4 terminal 11. The contacts SS2 and 6 connected to the other connection line from the P4 terminal 11 are formed so as to switch the dummy resistor RD8 for the transmitter from the P6 terminal 13 and the connection line from the P7 terminal 14. ing.

The relay S2 is designed to operate with signals from the P1 terminal 3 and the P2 terminal 4, and when the relay S2 operates, the contacts SS1,5 and the contacts SS2,6 of the relay S operate. By the operation of contacts SS1 and 5, the circuit of P3-SS1-P5 up to that point is P4-C1-V
Switch to the R1-P5 circuit. In the operation of contacts SS2,6, the circuit of P7-SS2-P4 until then switches to the circuit of P6-RD-SS2-P4. The reference numerals are omitted in the above description. (The same applies to the following.) In FIG. 2, reference numeral 15 indicates a part TC of the telephone circuit. 16 is a transmitter T, 17 is a transmitter mounting terminal T1, 18 is a transmitter mounting terminal T2, 19 is a transmitter terminal TT, 20 is a receiver R, 21 is a receiver terminal R1, 22 is a receiver terminal R2, 23 is the receiver terminal RR, 24
Is a pattern cut of the telephone circuit and is shown by X, 25 is one end of the cut portion, 26 is the other end of the cut portion, 27 is a connecting cord JC
The terminals indicated by the dotted lines are connected. 28 is a circuit HT. Others are omitted because they are not related to the gist of the present invention.

The circuit of the embodiment of the present invention connected to a coin-operated telephone is as shown in FIG. 2, and its operation will be described below.

First, although not shown, when money is put into a coin-operated telephone or the like, a current flows through the circuit HT28 and the relay S2 operates. By the operation of contact SS2,6, until now T1-T-TT
The circuit of -P7-SS2-P4-T2 is switched to the circuit of T1-P6-RD-SS2-P4-T2, the transmitter T16 is replaced by the dummy resistor RD, and the operation of the contact SS15 causes the receiver to operate. Audio signal path capacitors C1, 9 and audio suppression resistors VR1, 7 are inserted. Therefore, the use of the transmitter T16 is restricted, and even if the user speaks out loud from the earpiece, it can be restricted by the voice suppression resistors VR1 and 7, so that the other party cannot communicate.

[Effect of device]

As described above, by adding the transmission / reception circuit switching circuit according to the embodiment of the present invention to a coin-operated type telephone or the like, a part of the call such as number guidance or manual call application can be restricted in the coin-type telephone or the like. For example, there is an effect that it is possible to obtain a transmission / reception circuit switching circuit that can regulate the use of free special numbers.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of an embodiment of the present invention, and FIG. 2 is a connection diagram of the embodiment of the present invention and a coin-operated telephone. 1 ... Transfer / receiver circuit switching circuit, 2 ... Relay S, 3 ... P1
Terminals, 4 ... P2 terminals, 5 ... Relay contacts SS1, 6 ... Relay contacts SS2, 7 ... Voice signal suppression resistors VR1, 8 ... Transmitter dummy resistors RD, 9 ... Voice signal path capacitors C1, 10 ... P3 terminals, 11 ... P4 terminal, 12 ... P5 terminal, 13 ... P6 terminal, 14 ... P7 terminal, 15 ... Part of telephone circuit TC, 16 ... Telephone transmitter T, 17 ... Telephone mounting terminal T1,18 ... Telephone transmitter Mounting terminals T2, 19 ... Speaker terminal
TT, 20 ... Receiver R, 21 ... Receiver terminal R1, 22 ... Receiver terminal
R2, 23 ... Receiver terminal RR, 24 ... Telephone circuit pattern cut X, 25 ... One end of cut point, 26 ... Other end of cut point, 27
… Connection cord JC, 28… Circuit HT.

Claims (1)

[Scope of utility model registration request] 1. A transmission / reception circuit switching circuit for a public telephone, which restricts a part of a call when calling a free special number such as a directory from a coin-operated public telephone, outputs a signal when coin is inserted into the public telephone. And a relay having first and second switching circuits that are connected in series to a circuit that is driven by a signal from the circuit and that continues its operation until the response signal of the called party arrives; And a make contact which is connected to the common terminal side of the first switching circuit of the relay by disconnecting one end of the receiver terminal of the transmitter / receiver circuit, and which is closed by the relay operation.
A voice signal suppressing resistor having a predetermined value that is connected between the common terminal of the second switching circuit of the relay and that suppresses a voice signal output from the handset, and a predetermined value that is connected in series to the resistor. Of the voice signal path and one end of the transmitter of the transmitter / receiver circuit are disconnected from the first transmitter mounting terminal, and the first terminal and the common terminal of the second switching circuit of the relay are connected to each other. A second transmitter mounting terminal to which, while being connected, one end of the separated transmitter is connected to a break contact of the second switching circuit of the relay, and the other end of the transmitter is connected to, A transmitter / receiver circuit switching circuit comprising: a transmitter dummy resistor connected between a make contact of a second switching circuit of the relay.