CN208754375U - Backward signalling detection circuit - Google Patents
Backward signalling detection circuit Download PDFInfo
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- CN208754375U CN208754375U CN201821519659.8U CN201821519659U CN208754375U CN 208754375 U CN208754375 U CN 208754375U CN 201821519659 U CN201821519659 U CN 201821519659U CN 208754375 U CN208754375 U CN 208754375U
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Abstract
The utility model provides backward signalling detection circuit, it includes operational amplifier, phase locking unit, potentiometer, first resistor, second resistance, after this programme, the frequency for returning to zero signal sound is (450-475) Hz, break-make ratio is 4:1, it can determine the initial time of call with off hook state ringing tone signal, ringing tone signal is after operational amplifier LM386 amplifies 100 times, it is connected to the input terminal of phase locking unit LM567, adjustment RP1 can make phase locking unit lock (450-475) Hz signal, when detecting that speech channel has signal, the output end XHY of phase locking unit is low level, it otherwise is high level, it is fast using the detection reaction after this programme, detection effect is good.
Description
Technical field
The utility model relates to field of circuit technology, refer in particular to backward signalling detection circuit.
Background technique
For backward signalling detector for detecting telephone set signal, existing backward signalling detector circuit is complicated, the response time
Long, detection speed is slow.
Summary of the invention
The purpose of the utility model is to overcome the deficiencies in the prior art, provide that a kind of detection reaction is fast, detection effect is good
Backward signalling detection circuit.
To achieve the above object, technical solution provided by the utility model are as follows: backward signalling detection circuit, it includes
Operational amplifier, phase locking unit, potentiometer, first resistor, second resistance, wherein first resistor, second resistance one end respectively with phase
The interchanger connection answered, the first resistor other end connect with first capacitor one end, the first capacitor other end successively with the one or two pole
It is connect after pipe, the second diode, the connection of third capacitor one end with the 4th capacitor one end, the 4th capacitor other end and operational amplifier
Be just connected；The second resistance other end is successively another with the first diode other end, the second diode other end, third capacitor
It is connect after the connection of end with the negative of operational amplifier；The output end of operational amplifier is connect with the 5th capacitor one end, the 5th capacitor
The connection of 3rd foot of the other end and phase locking unit, the 2nd foot of phase locking unit connect with the 6th capacitor one end, the 6th capacitor other end and the
It is connect after the connection of seven capacitor one end with the 8th capacitor one end, the 1st foot connection of the 7th capacitor other end and phase locking unit, the 8th capacitor
The other end is successively connected with the 8th foot, the 7th foot, the 6th foot of phase locking unit, and the 6th foot of phase locking unit is connected with first resistor one end
It connects, the first resistor other end is connected with potentiometer one end, the 5th foot connection of the potentiometer other end and phase locking unit.
The utility model the frequency for after adopting the above scheme, returning to zero signal sound be (450-475) Hz, break-make ratio 4:1,
It can determine the initial time of call with off hook state ringing tone signal, ringing tone signal is by operational amplifier LM386 amplification 100
After times, it is connected to the input terminal of phase locking unit LM567, adjustment RP1 can make phase locking unit lock (450-475) Hz signal, work as inspection
When measuring speech channel has signal, the output end XHY of phase locking unit is low level, otherwise is high level, anti-using the detection after this programme
Should it is fast, detection effect is good.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
Below with reference to all attached drawings, the utility model is described in further detail, the preferred embodiment of the utility model are as follows: ginseng
See attached drawing 1, backward signalling detection circuit described in the present embodiment includes operational amplifier LM386, phase locking unit LM567, current potential
Device PR1, first resistor R1, second resistance R2, wherein first resistor R1, the one end second resistance R2 respectively with corresponding interchanger
Connection, the first resistor R1 other end connect with the one end first capacitor C1, the first capacitor C1 other end successively with first diode
VD1, the second diode VD2, third one end capacitor C3 connection after connect with the 4th one end capacitor C4, the 4th capacitor C4 other end and
Operational amplifier LM386's is just connected；The second resistance R2 other end successively with the first diode VD1 other end, the two or two pole
It is connect after the pipe VD2 other end, the connection of the third capacitor C3 other end with the negative of operational amplifier LM386；Operational amplifier LM386
Output end connect with the 5th one end capacitor C5, the 5th capacitor C5 other end is connect with the 3rd foot of phase locking unit LM567, phase locking unit
The 2nd foot of LM567 is connect with the 6th one end capacitor C6, the 6th capacitor C6 other end connect with the 7th one end capacitor C7 after with the 8th
The connection of the one end capacitor C8, the 7th capacitor C7 other end are connect with the 1st foot of phase locking unit LM567, and the 8th capacitor C8 other end is successively
It is connected with the 8th foot, the 7th foot, the 6th foot of phase locking unit LM567, the 6th foot of phase locking unit LM567 is connected with the one end first resistor R1
It connects, the first resistor R1 other end is connected with the one end potentiometer PR1, the 5th foot of the potentiometer PR1 other end and phase locking unit LM567
Connection.The frequency for returning to zero signal sound of the present embodiment is (450-475) Hz, break-make ratio 4:1, with off hook state ringing tone signal
It can determine the initial time of call, ringing tone signal is connected to phase locking unit LM567 after operational amplifier LM386 amplifies 100 times
Input terminal, adjustment RP1 phase locking unit can be made to lock (450-475) Hz signal, when detecting that speech channel has signal, locking phase
The output end XHY of device is low level, otherwise is high level, fast using the detection reaction after the present embodiment, detection effect is good.
The embodiment of the above is only the preferred embodiment of the utility model, and the reality of the utility model is not limited with this
It applies range, therefore all shapes according to the utility model, changes made by principle, should all cover in the protection scope of the utility model
It is interior.
Claims (1)
1. backward signalling detection circuit, it is characterised in that: it includes operational amplifier (LM386), phase locking unit (LM567), electricity
Position device (PR1), first resistor (R1), second resistance (R2), wherein first resistor (R1), the one end second resistance (R2) respectively with
Corresponding interchanger connection, first resistor (R1) other end are connect with the one end first capacitor (C1), first capacitor (C1) other end
After successively being connect with first diode (VD1), the second diode (VD2), the one end third capacitor (C3) with the 4th capacitor (C4) one
End connection, the 4th capacitor (C4) other end are just connected with operational amplifier (LM386)；Second resistance (R2) other end is successively
After being connect with first diode (VD1) other end, the second diode (VD2) other end, third capacitor (C3) other end with operation
The negative of amplifier (LM386) connects；The output end of operational amplifier (LM386) is connect with the 5th one end capacitor (C5), and the 5th
Capacitor (C5) other end is connect with the 3rd foot of phase locking unit (LM567), the 2nd foot and the 6th capacitor (C6) one of phase locking unit (LM567)
End connection, the 6th capacitor (C6) other end are connect after connecting with the 7th one end capacitor (C7) with the 8th one end capacitor (C8), and the 7th
Capacitor (C7) other end is connect with the 1st foot of phase locking unit (LM567), the 8th capacitor (C8) other end successively with phase locking unit
(LM567) the 8th foot, the 7th foot, the 6th foot is connected, and the 6th foot of phase locking unit (LM567) is connected with the one end first resistor (R1)
It connects, first resistor (R1) other end is connected with the one end potentiometer (PR1), potentiometer (PR1) other end and phase locking unit (LM567)
The 5th foot connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821519659.8U CN208754375U (en) | 2018-09-17 | 2018-09-17 | Backward signalling detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821519659.8U CN208754375U (en) | 2018-09-17 | 2018-09-17 | Backward signalling detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208754375U true CN208754375U (en) | 2019-04-16 |
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ID=66083464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821519659.8U Active CN208754375U (en) | 2018-09-17 | 2018-09-17 | Backward signalling detection circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN208754375U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111405131A (en) * | 2020-03-30 | 2020-07-10 | 深圳震有科技股份有限公司 | Method, system and storage medium for detecting far-end off-hook signal |
-
2018
- 2018-09-17 CN CN201821519659.8U patent/CN208754375U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111405131A (en) * | 2020-03-30 | 2020-07-10 | 深圳震有科技股份有限公司 | Method, system and storage medium for detecting far-end off-hook signal |
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| CP01 | Change in the name or title of a patent holder |
Address after: 412000 Hunan Province, Zhuzhou city Tianyuan District Lujiang Road No. 2 Patentee after: Hunan Hongwei Electronic Technology Co., Ltd Address before: 412000 Hunan Province, Zhuzhou city Tianyuan District Lujiang Road No. 2 Patentee before: ZHUZHOU HONGDA MICROELECTRONICS TECHNOLOGY Co.,Ltd. |