JPS59119955A - Switching system of telephone circuit - Google Patents

Abstract

PURPOSE:To provide the calling and called functions, etc. with no intervention of a handset to a facsimile terminal by providing a switch circuit in parallel to a hook switch of a telephone set with a contact to close a loop to a telephone circuit and a switch contact to a loudspeaker. CONSTITUTION:A telephone circuit 10 provides a receiver R, a transmitter T, a bell ringing tone ringer circuit 11, hook switches HS1-HS4 which work in response to the up-down movements of a handset, etc. In addition, an amplifier 12, a speaker SP, a switch relay RL and a speaker switch SPSW are provided for loudspeaking reception. The switch SPSW gives an input to the clock terminal CK of an FF14, and the output Q of the switch drives the relay RL via an inverter 17. The relay RL contains transfer contacts rl1 and rl2, and a make contact rl3. The contact rl1 is inserted to a circuit of the transmitter T and the speaker SP; while contacts rl2 and rl3 are connected in parallel to the switches HS2 and HS3 respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a telephone circuit switching system for amplifying the sound of a telephone that is connected to a telephone line together with a facsimile terminal and is capable of receiving amplified calls, and switching to a non-amplified receive call.

Prior Art and Problems A facsimile terminal is equipped with a telephone, and when transmitting a fax, the telephone calls the other party, and in response, the facsimile terminal of the other party becomes ready to receive data and then begins transmission. The telephone is generally provided separately from the facsimile machine and is simply connected to the same telephone line together with the facsimile machine via a changeover switch, but some telephones are built into the facsimile machine. There are also some that are equipped with a speaker and can receive amplified calls instead of the usual telephone receiver. A telephone equipped with a loudspeaker reception function capable of outputting a received voice from a speaker includes a circuit for switching between loudspeaker reception using the speaker and non-audience reception using a normal handset. This switching circuit is switched to the amplification side by operating a telephone key called a speaker switch, and is returned to the non-amplification side by operating the telephone key again.

In systems where a telephone with a switching circuit and a terminal (facsimile terminal) use a common telephone line as described above, by devising a control relay for the switching circuit, it is possible to call the other party without picking up the handset, or to receive audible calls after sending a facsimile. It is easy to automatically switch to

Purpose of the Invention The present invention has focused on the above point, and has devised a switching control circuit to enable a facsimile terminal with a telephone with amplification function to make calls, receive calls, automatically recover, etc. without going through a handset. The aim is to provide a variety of functions.

Structure of the Invention The present invention provides a contact and a loudspeaker that are installed in parallel with a hook switch of the telephone to open a loop to the telephone line in a circuit switching system for a telephone that is connected together with a facsimile terminal to a telephone line and has a function of loudspeaker reception. A switching circuit having a circuit switching contact for the facsimile terminal is provided, the switching circuit is operated by operating a first telephone key for loudspeaker reception, and a second telephone key is operated to instruct the start of communication by the facsimile terminal or the first telephone key is operated. The switching circuit is characterized in that the switching circuit is restored by re-operating the telephone key, and this will be explained in detail below with reference to the illustrated embodiment.

Embodiment of the Invention The drawings show an embodiment of the present invention, which is a facsimile terminal with a built-in telephone circuit, but for convenience of explanation, the telephone circuit 10 is shown outside the facsimile terminal 20. 30 is a telephone line shared by these. The telephone circuit 10 includes a normal receiver R, a transmitter T, a tone ringer circuit 11 that rings a bell, hook switches H3+ to H'34 that are linked to raising (off-hook) and lowering (on-footer) the handset (handset), etc. However, this device also includes a loudspeaker amplifier 12 for loudspeaker reception, and a speaker SP.
It is equipped with a relay RL and a speaker switch spsw for performing one switching. Di is dial-in contact, DS
is a shunt contact when dialing, L is an inductance that constitutes a hybrid, and I3 is a full-wave rectifier circuit.

The speaker switch spsw is a self-recovery type that closes when pressed and opens when released, and is a clock terminal C of the flip-flop circuit 14.
Give input to K. The flip-flop circuit I4 outputs Q to "1" and "O" every time an input is input to the clock terminal CK.
, "1"... and performs a so-called binary operation.

Furthermore, when there is an input to the reset terminal R, the Q output is forcibly reset to "0".

The Q output of flip-flop 14 drives relay RL via inverter 17. This relay RL has transfer contacts r#+, rj22 and a make contact r123, the contact r11 is inserted into the circuit of the transmitter T and the speaker SP, and the contact rρ2 is connected in parallel with the switch H32 and the contact r
l13 is connected in parallel with hook switch H33. The illustrated state is a standby state for non-audience reception, in which relay RL is turned off and its contact rN+ is connected to the transmitter T side. Furthermore, since the hand separator 1- (not shown) is also on-hook, the hook switch H8l is closed so that a calling signal is guided to the tone ringer circuit 11. In this state, if you off-hook the hand cent, the hook switch H3+
opens and H32 and H33 close, so telephone line 3
0, a closed loop including the transmitter, receiver T, and R is formed, which is detected by the exchange and an oscillating tone is returned. In this state, if a dial (not shown) is operated, the contact Di turns on and off, and the other party's telephone is called. The output terminal of an OR gate 15 is connected to the reset terminal of the flip-flop circuit 14, and one input of this OR gate is connected to a pulse generation circuit consisting of a hook switch H34 and an RC circuit, and the other input is connected to a pulse generation circuit through an inverter 16. Communication switch 21 is connected.

In this circuit, when there is a call from the other party's phone, line 3
0, switching contact 22, capacitor 0, rectifier 13, contact rA2, H3+, 1 - ringer circuit 11, rectifier 13
, a signal current flows through the path of the switching contact 22', and the tone ringer circuit 11 operates to generate a ringing tone. When the handset is picked up, the hook switch H3+ opens to disconnect the tone ringer circuit 11, and the footer switches H32 and H33 are closed to transmit and form the receiver T and H circuits. This allows you to talk to the other party, and if you are receiving a facsimile, contact point 2
2. Switch 22' to the fax side and put it in fax reception mode. The calling of the other party's telephone is as described above, and these are the sending and receiving operations of distant thunder.

When receiving a loudspeaker, close the speaker switch spsw. As a result, the Q output of the flip-flop 14 becomes 1'',
The output of the inverter 17 is L (low) level, so the relay RL is energized and switches the relay contact r(12) to the speaker side and closes the relay contact r7!3.The remaining relay contact rβ1 is at this time on the loudspeaker amplifier 12 side. to form a power supply path to the amplifier.In this state, the received voice is amplified from the speaker SP.If you set the above amplification state when making a call, not when receiving a call from the other party, you can place the hunt set. On-hook transmission is now possible.This is because relay contacts r4+ and rβ3 are connected to hook switches H32 and H33.
It is clear from the fact that .

The procedure for this on-hook communication is as follows.

First, when speaker switch spsw is turned on and flip-flop I4 is set, relay RL is driven and contact rI! , 2. r13 closes. In this state, the contact Di opens and closes intermittently to dial the number of the other party), and the facsimile terminal of the other party responds with 2100H.
When the CED of z is returned (when automatically received), a continuous beeping sound of 2100 Hz is output from the speaker SP.

When the operator hears this continuous tone, he switches the switch 22, 22' of the terminal 20 to the fax side, thereby starting transmission. At this time, the communication switch 21 is also closed, and the ON information of this switch 21 is led to the reset terminal of the flip-flop 14 through the inverter 16 and the OR gate 15, thereby resetting the flip-flop 14. This makes it possible to turn off relay RL and automatically return telephone circuit 10 to a standby state without amplification. In this way, according to this circuit, fax communication can be started by simply pressing the speaker switch spsw, without having to pick up the telephone.

Note that the switching of the flip-flop 14 is also performed by turning off the hook switch H8a, that is, by off-hooking the hand center. Therefore, if you pick up the hunt set, even if the telephone is in amplification mode, it will return to the transmitter side, and from then on, the call will be transmitted and the receiver will be placed on the receiver.

This can be done with R. Also speaker switch 5PSW
By operating again, the flip-flop is re-inverted and placed in the reset state, which can be used, for example, to abort a call when the other party does not answer. In addition, contact point 2
2.22' is a contact point for network control that connects either the telephone circuit 10 or the facsimile terminal 20 to the telephone circuit 30, so even after the end of the call by the terminal 20, the handset can be off-hook or the speaker switch 5PSW
in the loudspeaker receiving state, and in this state press contact 2.
2.22' is switched to the telephone circuit 10 side, the line with the other party is maintained and it is possible to have a meeting with the other party after sending and receiving a fax. If you want to disconnect the line after the communication by the terminal 20 is finished, leave the hand center in the on-footer position and do not use the loudspeaker to receive the call, then press the contact point 22.22'.
It is only necessary to switch to the telephone circuit 10 side.

Effects of the Invention As described above, according to the present invention, the speaker switch s
The psw creates an off-hook state for loudspeaker reception, and the state can be canceled by pressing the communication switch and off-hook, so on-hook calls and terminal on-hook communications are possible, as well as switching to the loudspeaker reception circuit during a call. The advantages include being able to switch back and automatically connect to the loudspeaker receiving circuit when the terminal call ends.

[Brief explanation of drawings]

The drawing is a circuit diagram showing an embodiment of the present invention. In the figure, 10 is a telephone circuit, SP is a speaker, R is a telephone receiver, RL is a relay for switching between loudspeaker and non-speaker, spsw is a speaker switch (first power line 11), 20 is a facsimile terminal, 21 is a communication switch ( (second telephone key), H8 is a footer switch. Applicant Minoru Aoyagi, Fujitsu Limited Representative Patent Attorney

Claims (1)

[Claims] In the circuit switching system of a telephone that is connected to a telephone line together with a facsimile terminal and has a loudspeaker reception function, a contact that is installed in parallel with the hook switch of the telephone to close the loop to the telephone line and a circuit to the loudspeaker. A switching circuit having a switching contact is provided, the switching circuit is operated by operating a first telephone key for loudspeaker reception, and the second telephone key is operated to instruct the start of communication by the facsimile terminal or the first telephone key is reactivated. It is characterized in that the switching circuit is restored by operation.
Telephone circuit switching method.