CN85204628U - Calling signal generator with squelch circuit for button type telephone - Google Patents
Calling signal generator with squelch circuit for button type telephone Download PDFInfo
- Publication number
- CN85204628U CN85204628U CN 85204628 CN85204628U CN85204628U CN 85204628 U CN85204628 U CN 85204628U CN 85204628 CN85204628 CN 85204628 CN 85204628 U CN85204628 U CN 85204628U CN 85204628 U CN85204628 U CN 85204628U
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- low
- call signal
- frequency oscillator
- amplifier
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Abstract
The utility model discloses a calling signal tone generator (5) for a button type telephone (1), wherein, a low frequency oscillator (7) and an analog switch (AS) which are driven by accepted calling signals can provide the output of the oscillator, and the output can be sent to a loudspeaker (6) through a potentiometer (VR) and a low-frequency amplifier (A). An attenuator (9) is assembled in order to drive the loudspeaker (6) to response to the accepted calling signals by set volume when a telephone is busy, the attenuator is connected with the output terminal of the oscillator (7) and the input terminal of the amplifier (A), so that the bypass of the potentiometer (VR) and the analog switch (AS) can be formed, and the analog switch (AS) is prohibited from being closed when the telephone is busy.
Description
The utility model relates to, and what be connected with main device by talk line, inner simultaneously have in the touch-tone telephone of call signal tone generating device, can reduce the squelch circuit of the volume of call signal sound when incoming call occurring in the conversation.
In general, the push-button phone device is made of a main device and several touch-tone telephones.As a kind of push-button phone device, in touch-tone telephone, be provided with microphone, the sound that the called telephone machine is sent is sent by this microphone.As a kind of push-button phone device, in each touch-tone telephone with this microphone.Be provided with the low-frequency oscillator that call signal is used, the data that the call signal of sending according to main device is used drive low-frequency oscillator, give above-mentioned microphone with call signal after, microphone just sends the call signal sound.This touch-tone telephone has squelch circuit, reduces the volume of the call signal sound that microphone sends when incoming call occurring in conversation with this telephone set of box lunch.
Fig. 2 is the circuit diagram that call signal tone generating device with squelch circuit constituted example in the past.Touch-tone telephone 1 is connected with main device 3 by talk line 2.Touch-tone telephone 1 contains speaking circuit 4 and has the call signal tone generating device 5 of squelch circuit.Speaking circuit 4 and call signal tone generating device 5 utilize the change over switch S that is inserted in the talk line 2 to change.
In call signal tone generating device 5, T is a transformer, its primary coil N
1Be connected with talk line 2 by change over switch S.The secondary coil N of variable resistor (potentiometer) VR and transformer T
2Parallel connection, microphone 6 is connected with the contactor of potentiometer VR by amplifier A.7 low-frequency oscillators of using for call signal, its output is by the secondary coil N of analog switch AS and transformer T
2Be connected.Noise elimination resistance R X is in parallel with analog switch AS, and 8 is control circuit, controls the switching of analog switch AS and the vibration of low-frequency oscillator 7 according to the data of sending here by the data wire (not shown) of main device 3.
In such formation, when the data wire of touch-tone telephone 1 by main device 3 received call-in message, control circuit 8 was just with analog switch AS closure, and made low-frequency oscillator 7 that interrupted oscillations take place.Therefore, the call signal of low-frequency oscillator 7 outputs is sent in the microphone 6 by analog switch AS, potentiometer VR and amplifier A.Thereby, microphone 6 exportable call signal sounds.The volume of this call signal sound can be adjusted with potentiometer VR.
On the other hand, in the conversation of speaking circuit 4, the incoming call that detects touch-tone telephone 1 when main device 3 is when (comprising internal call), main device 3 just by data wire with call-in message and call-information notice.Therefore, control circuit 8 makes analog switch AS remain on separated position, and makes low-frequency oscillator 7 that interrupted oscillation take place.Thereby the call signal of low-frequency oscillator 7 outputs is sent into microphone 6 by noise elimination resistance R X, potentiometer VR and amplifier A.Therefore, but microphone 6 bid signal tones.The volume of this call signal sound can be reduced with noise elimination resistance R X, and available potentiometer VR is adjusted.
But, in above-mentioned example in the past, when incoming call occurring in the conversation, because the call signal sound not only passes through noise elimination resistance R X, but also send out, so the volume of call signal sound can change according to the set condition of potentiometer VR by potentiometer VR.Therefore, when adjusting potentiometer VR for making volume become minimum, the call signal sound of microphone 6 outputs can become too small and be difficult to listen to.
Characteristics with call signal tone generating device of squelch circuit of the present utility model are: by in talk line and the touch-tone telephone that main device is connected, have the transformer that primary coil is connected with above-mentioned talk line; Variable resistor with the parallel connection of secondary windings of this transformer; The fixed resistance that one end is connected with this variable-resistance contact point; The amplifier that input is connected with the other end of this fixed resistance; The microphone that is connected with the output of this amplifier; The low-frequency oscillator that call signal is used; Be connected the analog switch between the secondary coil of the output of this low-frequency oscillator and above-mentioned transformer; Be connected the output of above-mentioned low-frequency oscillator and the attenuator between the above-mentioned amplifier input terminal; The control circuit that the data of sending here according to above-mentioned main device are controlled the vibration of the switching of above-mentioned analog switch and above-mentioned low-frequency oscillator.
With reference to the accompanying drawings embodiment of the present utility model is illustrated.
Fig. 1 illustrates the circuit diagram that call signal tone generating device one embodiment with squelch circuit of the present utility model constitutes.The identical symbol of part that has identical functions with Fig. 2 with the difference of the circuit in the past of Fig. 2 is: resistance R
1Be connected between the input of the contact point of potentiometer VR and amplifier A, and attenuator 9 is connected between the input of the output of low-frequency oscillator 7 and amplifier A.
The attenuator 9 of present embodiment adopts by resistance R m
1, Rm
2And Rm
3The T type attenuator that constitutes.Low-frequency oscillator 7 is by NOT-AND gate X
1, X
2, inverter X
3, resistance R os
1, Ros
2Constitute with capacitor Cos.
Below with reference to Fig. 1 action of the present utility model is illustrated.
When the data wire of touch-tone telephone 1 by main device 3 receives call-in message, control circuit 8 just makes analog switch AS closure, and make control signal Scont that interrupted (for high level " H ", being low level " L " between 2 seconds between 1 second) take place, thereby can make low-frequency oscillator 7 that interrupted oscillation takes place.Therefore, on the other hand, the major part of the call signal of low-frequency oscillator 7 outputs is by analog switch AS, potentiometer VR and resistance R
1In the input amplifier A.All the other parts are by in the attenuator 9 input amplifier A.The output signal of amplifier A is sent in the microphone 6.Therefore, microphone 6 sends the call signal sound that volume is adjusted by potentiometer VR.
On the other hand, in the conversation of speaking circuit 4, when main device 3 detected the incoming call of touch-tone telephone 1, main device 3 was just notified call-in message and call-information by data wire.Therefore, control circuit 8 makes the analog switch AS state of remaining on out, and makes low-frequency oscillator 7 that interrupted oscillation take place.Thereby the call signal of low-frequency oscillator 7 outputs is sent in the microphone 6 by attenuator 9 and amplifier A.Therefore microphone 6 produces the call signal sound that volume is reduced by attenuator.
Here when potentiometer VR for hour, as if non-resistance R
1, then the call signal of sending here by attenuator 9 less transmits to amplifier A side, and almost all transmits to potentiometer VR side.
But, because resistance R
1Be connected between the input of the contact point of potentiometer VR and amplifier A, be restricted so the call signal of sending here by attenuator 9 transmits to potentiometer VR side.
Can understand by above explanation,, can reduce call signal in the conversation with simple circuit configuration, and less be subjected to the influence of potentiometer set condition according to the utility model.
The simple declaration of accompanying drawing
Fig. 1 illustrates the circuit diagram with call signal tone generating device-example structure of squelch circuit of the present utility model, and Fig. 2 illustrates the call signal tone generating device circuit diagram of example structure in the past with squelch circuit.
1 is touch-tone telephone, and 2 is talk line, and 3 is main device, and 4 is speaking circuit, and 5 is the call signal tone generating device, and 6 is microphone, and 7 is oscillator, and 8 is control circuit, and 9 is attenuator, and T is a transformer, and A is an amplifier, R
1Be resistance, AS is an analog switch, and VR is a potentiometer.
Claims (1)
1, by having the call signal tone generating device of squelch circuit in speaking wire and the touch-tone telephone that main device is connected, it is characterized by and include the transformer that primary coil is connected with above-mentioned talk line; With the variable resistor of the parallel connection of secondary windings of this transformer, the fixed resistance that an end is connected with this variable-resistance contact point; The amplifier that input is connected with the other end of this fixed resistance, with the microphone that the output of this amplifier is connected, the low-frequency oscillator that call signal is used; Be connected the analog switch between the secondary coil of the output of this low-frequency oscillator and above-mentioned transformer; Be connected the output of above-mentioned low-frequency oscillator and the attenuator between the above-mentioned amplifier input terminal; The control circuit that the data of sending here according to above-mentioned main device are controlled the vibration of the switching of above-mentioned analog switch and above-mentioned low-frequency oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85204628 CN85204628U (en) | 1984-11-15 | 1985-11-05 | Calling signal generator with squelch circuit for button type telephone |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP172321/1984 | 1984-11-15 | ||
| CN 85204628 CN85204628U (en) | 1984-11-15 | 1985-11-05 | Calling signal generator with squelch circuit for button type telephone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85204628U true CN85204628U (en) | 1987-04-29 |
Family
ID=4799896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85204628 Expired - Lifetime CN85204628U (en) | 1984-11-15 | 1985-11-05 | Calling signal generator with squelch circuit for button type telephone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85204628U (en) |
-
1985
- 1985-11-05 CN CN 85204628 patent/CN85204628U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |