CN2278314Y - Detector for phone hanging up and taking off - Google Patents
Detector for phone hanging up and taking off Download PDFInfo
- Publication number
- CN2278314Y CN2278314Y CN 96230647 CN96230647U CN2278314Y CN 2278314 Y CN2278314 Y CN 2278314Y CN 96230647 CN96230647 CN 96230647 CN 96230647 U CN96230647 U CN 96230647U CN 2278314 Y CN2278314 Y CN 2278314Y
- Authority
- CN
- China
- Prior art keywords
- pass filter
- current sampling
- filter network
- sampling resistor
- balance low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a ring trip detector for phone hanging up and taking off, composed of a differential comparator, two balanced low-pass filter networks, and two current sampling resistances. The two input terminals of the differential voltage comparator are connected with the output terminals of the two balanced filter networks at the same time. The input terminals of the two balanced filter networks are respectively connected with the current sampling resistances. The detection threshold and ring trip detection threshold of the utility model can respectively realize to adjust, which simplifies structure and reduces cost, and as well as is convenient in actually using.
Description
The utility model relates to a kind of stored-program control exchange user interface circuit field dislodging machine commonly used and cuts the bell checkout gear.
Dislodging machine in the past cuts the bell checkout gear such two types usually: the one, and dislodging machine testing device is independent separately with section bell checkout gear, and the many costs of the component number that this mode is used are higher.The 2nd, adopt the circuit structure among the ZL94200797.2 " telephone exchange user circuit interface parts are with cutting the bell filter ", the dislodging machine testing thresholding in this structure can not be regulated respectively with a section bell detection threshold.
The purpose of this utility model is to provide a kind of dislodging machine to cut the bell checkout gear.This device adopts a comparator and dislodging machine testing thresholding to realize regulating respectively with cutting the bell detection threshold, and both simplified structure reduced cost, and was convenient to actual use again.
Purpose of design of the present utility model can realize by following array structure: it includes back stagnant or does not have back the differential-voltage comparator (1) that stagnates, balance low-pass filter network (2), current sampling resistor (3), balance low-pass filter network (4) and current sampling resistor (5), of the present utility model being characterised in that: the input of differential-voltage comparator (1) is connected with the output of balance low-pass filter network (2), and be connected with the output of balance low-pass filter network (4) simultaneously, two inputs of the low road filter network (2) of balance are connected with current sampling resistor (3) respectively, and two inputs of balance low-pass filter network (4) are connected with current sampling resistor (5) respectively.
Purpose of design of the present utility model also can realize by following manner: two input resistance to earth of described differential-voltage comparator (1) equate and have stronger common-mode voltage to suppress ability.
Drawing and embodiment in conjunction with the accompanying drawings, above-mentioned purpose of the present utility model, characteristics and advantage are more apparent.
Fig. 1 is the simplified electrical circuit diagram of first embodiment of the utility model.
Fig. 2 is the simplified electrical circuit diagram of second embodiment of the utility model.
Among the figure: 1. differential-voltage comparator, 2. balance low-pass filter network, 3. current sampling resistor,
4. balance low-pass filter network, 5. current sampling resistor.
In Fig. 1, the positive and negative electrode input common mode input resistance of differential-voltage comparator equates have stronger common-mode voltage to suppress ability.During the difference-mode input comparator, positive and negative turnover voltage has back and stagnates or does not have back stagnantly, and balance resistance transmission network (2) can be the voice signal filtering in the differential voltage; The cut-off frequency of balance low-pass filter network (4) is lower than the cut-off frequency of balance low-pass filter network (2), so that the 25Hz ringing voltage target signal filter in the filtering differential voltage
Suitably choose the decay and the cut-off frequency of current sampling resistor (3) and balance low-pass filter network (2), when making loop current in the current sampling resistor (3) reach thresholding, comparator overturns just and not disturbed by voice signal, realizes dislodging machine testing function; If circuit is in ringing condition, loop current flows through sample resistance (5) and the middle loop free electric current of sample resistance (3).
Equally, suitably choose the decay and the cut-off frequency of current sampling resistor (5) and balance low-pass filter network (4), when making loop current in the current sampling resistor (5) reach thresholding, comparator overturn just be not subjected to simultaneously the 25Hz ringing current influence to realize that cutting a bell detects.
Suitably regulate current sampling resistor (3) and can change dislodging machine testing thresholding; Suitably regulate current sampling resistor (5) and can change a section bell thresholding, thereby finally realize the adjusting respectively of two kinds of thresholdings.
Fig. 2 adopts the 2nd embodiment of the present utility model, and wherein balance low-pass filter network (2) does not use electric capacity.Because voice signal is very little, the returning to stagnate of comparator makes voice signal not influence the normal upset of comparator.
The dislodging machine that adopts the utility model to provide cuts the bell checkout gear, can realize regulating respectively dislodging machine testing thresholding and cut the bell detection threshold, makes both all can reach optimum state.This utility model is applied to not only can reduce cost in the stored-program control exchange user interface circuit, and improves the job stability of user interface circuit greatly.
Claims (2)
1. a dislodging machine cuts the bell checkout gear, it includes back stagnant or does not have back the differential-voltage comparator (1) that stagnates, balance low-pass filter network (2), current sampling resistor (3), balance low-pass filter network (4) and current sampling resistor (5), of the present utility model being characterised in that: the input of differential-voltage comparator (1), be connected with the output of balance low-pass filter network (2), and be connected with the output of balance low-pass filter network (4) simultaneously, two inputs of balance low-pass filter network (2), be connected with current sampling resistor (3) respectively, two inputs of balance low-pass filter network (4) are connected with current sampling resistor (5) respectively.
2. a kind of dislodging machine according to claim 1, section bell checkout gear is characterized in that: two input resistance to earth of differential-voltage comparator equate and have stronger common-mode voltage to suppress ability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96230647 CN2278314Y (en) | 1996-09-06 | 1996-09-06 | Detector for phone hanging up and taking off |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96230647 CN2278314Y (en) | 1996-09-06 | 1996-09-06 | Detector for phone hanging up and taking off |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2278314Y true CN2278314Y (en) | 1998-04-08 |
Family
ID=33908031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96230647 Expired - Fee Related CN2278314Y (en) | 1996-09-06 | 1996-09-06 | Detector for phone hanging up and taking off |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2278314Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118899A (en) * | 2018-02-07 | 2019-08-13 | 亚德诺半导体无限责任公司 | Detect the fault state and the unbalanced method and apparatus of channel of differential signal chain |
-
1996
- 1996-09-06 CN CN 96230647 patent/CN2278314Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118899A (en) * | 2018-02-07 | 2019-08-13 | 亚德诺半导体无限责任公司 | Detect the fault state and the unbalanced method and apparatus of channel of differential signal chain |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |