JPS6077561A - Telephone set with loudspeaker for reception - Google Patents

Abstract

PURPOSE:To attain switch over of a telephone set with use of a power supply of a telephone line by providing a hook switch restoring a latching relay with off- hook of a handset, and a hook switch also switching a talking circuit and a reception loudspeaker circuit. CONSTITUTION:In depressing an on-hook transmission nonlock switch 3 while the handset hooks on, a pulse current flows to a relay 8, a contact 10 is held to apply a DC to a dial circuit 11 and the reception loudspeaker circuit 14 thereby closing the DC circuit of a telephone line. When dialing is performed by using the circuit 11, a dial signal is transmitted to the telephone line 1 and the circuit 14 confirms the response of a called party. When the response of the called party is confirmed and the handset is hooked off, contacts 9, 12 of the hook switch are operated, the circuit 14 is turned off and the circuit 13 is turned on with the operation of the contact 12, the talking is switched to a handset talking, a pulse current flows to the relay 8, then the contact 10 is restored.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a telephone with an incoming loudspeaker circuit that automatically switches from an incoming loudspeaker circuit to a speaking circuit when the handset moves off-hook during an on-hook call. However, the detection circuit required a separate power source other than the telephone line.

SUMMARY OF THE INVENTION An object of the present invention is to overcome all of the above-mentioned drawbacks and to provide a telephone set with amplification system that uses power only from the telephone line and automatically switches from the reception amplification circuit to the speech circuit by off-hook operation of the handset. be.

The present invention includes a non-locking switch for on-hook transmission, a latching relay that self-holds when the switch is turned on, and a latching relay that restores the latching relay when the handset is turned on, and a communication circuit and a loudspeaker circuit. It is a telephone with an amplification system that includes a hook switch that also serves as a switching function, a dial circuit, and a rectifier circuit.

Next, the present invention will be explained using examples.

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

In Fig. 1, the symbol l is the telephone line, and the symbol 2 is the telephone line l.
4 and 6 are DC blocking capacitors, 5 and 7 are current limiting resistors, 8 is a latching relay, and 9 and 12 are not particularly shown, but are linked to the handset. The contact point of the hook switch, code 1O, is the contact point of latching relay 8, code 1.
Reference numeral 3 represents a speech circuit, and reference numeral 14 represents a loudspeaker circuit.

Although not particularly shown in FIG. 1, when the non-lock switch 3 for on-hook transmission is pressed while the handset is placed (on-hook), a pulse current flows to the latching relay 8 through the capacitor 4 and the resistor 5, and the latching relay 8 is activated. The contact 10 operates and maintains its operation to supply direct current to the dial circuit 11 and the loudspeaker circuit 14, thereby closing the direct current circuit of the telephone line. 'Next, when dialing is performed by the dialing circuit 11, a dialing signal is sent to the telephone port ral, and can be confirmed by the receiving loudspeaker circuit 14 through a speaker (not shown) until the called party answers. Then, when the called party's response is confirmed through the speaker, the entire handset is lifted (off-hook), and contacts 9 and 12 of the hook switch are activated by the off-hook operation of the handset.
The operation of the contact 12 turns off the loudspeaker circuit 14 and turns on the communication circuit 13, switching the call to the called party to a handset call, and a pulsed current is passed through the capacitor 6 and resistor 7 to the latching relay 8. , the latching relay 8 operates, and its contact 10 is restored.

As described above, according to the present invention, it is possible to obtain the effect that the receiving loudspeaker circuit can be automatically switched to the speaking circuit by the off-hook operation of the handset using only the power supply of the telephone line.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention. 1...Parameter line, 2...Rectifier circuit, 3
・・・・・・Non-lock switch for on-hook oscillation, 4
．． 6... Capacitor, 5, 7... Resistor, 8... Latching relay, 9.12...
...Hook switch contact, 10...Latching relay contact, 11...Dial circuit, ]3
...Telephone circuit, 14...Telephone loudspeaker circuit.

Claims (1)

[Claims] A non-lock switch for on-hook oscillation, a latching relay that closes and self-holds the DC circuit of the LINE talking line when this switch is turned on, and a latching relay that restores the above-mentioned latching relay i by the off-hook operation of the handset and connects the talking circuit. A telephone with an amplification system, characterized in that it is equipped with a hook switch for switching an amplification circuit.