JPS62231551A - Function telephone set - Google Patents

Abstract

PURPOSE:To transmit a variety of signals such as an FM signal, a holding tone a call receiving loud signal and a data communication signal and a holding sound to a telephone line or take them out by serially connecting a function circuit and a call circuit to the telephone line and providing a means for shorting both terminals of the function circuit when it is not in use. CONSTITUTION:When a nonlock type holding key is pressed and lets it go during off-hook, a holding switch HLD is turned on for a short tme. Thus a transistor Q4 is turned off, and a holding circuit 2 and a call receiving loud circuit 3 are serially inserted to a call circuit 4. Simultaneously, an output HLD OUT operates a holding tone generator circuit 2 via a transistor Q5. When a call receiving loud key is depressed, a call receiving loud switch RLD is turned on, and a circuit is grasped in spite of a hooked state. While a control circuit 5 turns off a transistor Q4, it transmits an output MUTE OUT to the call circuit 4. As a result, a voice signal coming in the telephone line is issued as a lound sound out of a speaker SP2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a telephone, and more particularly to a functional telephone equipped with functions such as on-hold and amplification.

[Conventional technology]

Conventionally, in this type of telephone, functional circuits such as a hold tone generation circuit or a loudspeaker circuit are connected in parallel to the telephone line, or in that case, the line current is shunted and the call characteristics deteriorate. In order to prevent this, the connection is switched by a switch.

[Problem that the invention seeks to solve]

Therefore, when using the functional circuit, it has not been possible to send various signals to or take out various signals from the telephone line by utilizing the communication circuit, especially its amplifier circuit.

[Means for solving problems]

The present invention connects a functional circuit and a communication circuit in series to a telephone line, and is provided with means for short-circuiting both ends of the functional circuit when not in use.

[Effect]

When the functional circuit is used, various signals such as an MP signal, a hold tone, a data communication signal, and a loudspeaker signal are sent to or taken out from the telephone line via an amplifier in the telephone call circuit. On the other hand, when making a call using a handset that does not use a functional circuit, the functional circuit is short-circuited, so that the direct current impedance of the telephone decreases.

〔Example〕

The figure is a circuit diagram showing one embodiment of the present invention.

In the figure, line terminal L1. is connected to a telephone line from an exchange. When on-hook, the incoming call circuit 1 is connected to L2 via the capacitor C1, resistor R1, and hook switch H8I, so that a ring tone is emitted from the speaker SP1 in response to the ring signal, and the lamp LD is blinked. It is used to notify you of an incoming call.

In addition, at the time of off-footer, the line L1. A parallel circuit of a hold tone generation circuit 2 and a loudspeaker circuit 3 and a speech circuit 4 are connected in series to L2 via a diode bridge DB1 and between the emitter and collector of a transistor Q1.
This closes a straight loop to the telephone line.

Here, 5 is a control circuit equipped with a processor unit (CPU) such as a well-known microprocessor, and except when using the hold tone generation circuit 2 or the receiving loudspeaker circuit 3 as described later, the transistor Q4 is normally used. By turning on, the hold tone generating circuit 2 and the receiving loudspeaker circuit 3 are short-circuited,
By connecting only the communication circuit 4, the direct current impedance of the telephone is not increased. Note that IR is a reset terminal, and when the power supplied from the line current via the power supply circuit 7 rises, the capacitor C
3 and resistor R5 from the reset circuit consisting of resistor R5.
An initial reset signal is input via 19. In addition, in the off-hook state, the field effect transistor Q2
is resistor R2, hook switch) (82 meter contacts,
It is forcibly turned on by the line current via diode D2 and resistor R4, thereby turning on transistor Q1.

When making a dial call, the dial signal sending circuit 8, which is in operation and receives power from the line current via the power supply circuit 7, sends a pulse to the control circuit 5 as an output in response to key operations on the keyboard 9. Send out. In response, control circuit 5 sends out a pulse from the DPOUT terminal, and turns on and off transistor Q1 via transistor Q3 and field effect transistor Q2, thereby sending out a dial pulse. Note that during this dialing, the dial signal sending circuit 8 is controlled by the control circuit 5.
M[Sends a call circuit switching signal to the JTE IN terminal,
In response to this, the control circuit 5 switches the connection within the telephone circuit 4 based on the MIJTEO (JT ratio output) and disconnects the handset 6 from the telephone line.

Here, when the non-lock type hold key is pressed and released while off-hook, the hold switch (LD) is turned on for a short time.

Hook switch I (82 and this hold switch HL [
), the control circuit 5 detects that the hold key operation is disconnected during off-hook, turns off the transistor Q4 by outputting RLDOUT, inserts the hold circuit 2 and the receiving loudspeaker circuit 3 in series with the call circuit 4, and H.L.D.
The hold tone generation circuit 2 is operated by the OUT output via the transistor Q5. At the same time, the DPH8ON output turns off the transistor Q9 via the resistor R9, and provides an on-hook signal to the H8 terminal of the dial signal sending circuit 8. As a result, the dial signal output path 8 is prohibited from sending out a dial signal, and also sends a call circuit switching signal to the control circuit 5. In response to this, the control circuit 5 switches the call circuit 4 in the same way as when dialing. Switch the connection from the handset 6 side to the MF IN terminal side. As a result, the hold tone is emitted from the speaker SP2 via the resistor R11, the capacitor C4, and the amplifier in the receiving loudspeaker circuit 3, and at the same time, it is emitted from the telephone line via the capacitor C11, the resistor R18, and the amplifier in the speech circuit 4. sent to. Note that when a pending key operation is detected, the control circuit 5 sets the PWON1 output to the HJ level, and switches the diode D4 and resistor R4.
Since the field effect transistor Q2 is forcibly turned on via the transistor Q2, even if the field effect transistor Q2 is turned on in that state, the transistor Q1 is fixed in the on state and the line will not be released. Similarly, even if there is an on-hook while on hold, the control circuit 5 does not change the other output states, and the hold state continues.

-Also, even if the hold key is operated in the on-hook state, the hold state continues in the same way, and the hold is released only when the hold key is operated again in the off-hook state.

The dialing signal sending circuit 8 is equipped with a memory for speed dialing and automatic dialing in addition to a memory for redialing, and normally when on-hook (line not captured), sending out dialing signals is prohibited. , these dials can be registered and canceled by operating predetermined keys. The battery BAT is a backup power source, and it provides power while the line is not captured.
The contents of the memory are held, and the registration and cancellation operations described above are made possible.

In contrast, in this embodiment, in the hold state as described above, the on-hook signal is applied to the H8 terminal of the dial signal sending circuit 8 regardless of the hook state. Therefore, even in this state, it is possible to register and cancel speed dialing and automatic dialing in the same way as described above. In other words, the above registration and cancellation operations can be performed while enjoying the hold tone melody. In addition, when the line is open, the battery BAT is not discharged before the key is pressed in order to reduce consumption, but when the line is on hold, the necessary current can be secured from the line current, so the key is pressed in the same way as when making a dial call. The front can be released. That is, the signal sent from the KT terminal of the dial signal sending circuit 8 before the key is pressed is inputted to the BTIN terminal of the communication circuit 4 via the capacitor C7 and the resistor R14, and is emitted from the handset 6 via the internal amplifier. At the same time, it is also emitted from the speaker SP2 via the resistor R13, the capacitor C6, and the loudspeaker circuit 3. As a result, the above-mentioned dial registration and cancellation operations can be performed while confirming that the key is not pressed.

Next, press the receiving loudspeaker key, and the receiving loudspeaker switch R
LD turns on, resistor R3, loudspeaker switch RLD,
Line current supplied through diode D3 and resistor R4 turns on field effect transistor Q2, which turns on transistor Q1 and captures the line regardless of the hook condition. The loudspeaker key is also non-locking, and when released, the loudspeaker switch RLD turns off, but the control circuit 5 that detects that the loudspeaker switch RLD is turned on turns the PWON on.
Since the second output is set to the rHJ level and the field effect transistor Q2 is forcibly turned on via the diode D5 and the resistor R4, the line is maintained thereafter.

At the same time, the control circuit 5 sends a MUTEOUT output to the communication circuit 4, which turns off the transistor Q4. As a result, the voice signal arriving on the telephone line is emitted as amplified sound from the speaker 51) 2 via the telephone call circuit 4 and the loudspeaker circuit 3.

Note that when making a dial call using the DTMF method instead of the out-pulse dial method, the MF dial signal sent from the dial signal output path 8 is sent to the telephone line via the capacitor C10, the resistor R17, and the communication circuit 4. Ru. This MF dial signal is simultaneously transmitted to the BT of the communication circuit 4 via the capacitor C8 and the resistor R15.
It is input to the IN terminal, is output from the handset 6 through the amplifier circuit, and is output from the speaker SP2 through the resistor R12, capacitor C5, and loudspeaker circuit 3.
This can be confirmed.

Although the case of a stand-alone telephone has been described above, the present invention can be similarly applied to a button telephone device and the like.

〔Effect of the invention〕

1-JL@Ml'1 mouth I J-1-A IIrP
-to-nmJI/r l-J-+ 1.7
4e-Lr, r; By connecting the functional circuit and the communication circuit in series to the a line, MF double signal hold tone, receiving loudspeaker signal, and even data communication signals can be transmitted via the communication circuit network. send out various signals to the telephone line,
It can be taken out from the telephone line.

In other words, even when using various functional circuits other than when making a call using the handset, the amplifier etc. in the call circuit can be used in common. Further, by providing a means for short-circuiting the functional circuit when making a call using the handset, the direct current impedance of the telephone can be lowered in that case.

[Brief explanation of drawings]

The figure is a circuit diagram showing one embodiment of the present invention. 2... Hold tone generation circuit, 3... Receiving loudspeaker circuit,
4...Telephone circuit, 5...Control circuit, Q4...
...Transistor.

Claims (1)

[Claims] In a functional telephone equipped with a predetermined functional circuit in addition to a telephone call circuit, means for connecting the telephone circuit and the functional circuit in series with the telephone line, and short-circuiting both ends of the functional circuit when the functional circuit is not in use. A functional telephone characterized by being provided with.