CN102025890B - Method and system for restoring video line synchronizing signal - Google Patents
Method and system for restoring video line synchronizing signal Download PDFInfo
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- CN102025890B CN102025890B CN200910190378.1A CN200910190378A CN102025890B CN 102025890 B CN102025890 B CN 102025890B CN 200910190378 A CN200910190378 A CN 200910190378A CN 102025890 B CN102025890 B CN 102025890B
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- 238000011084 recovery Methods 0.000 claims description 15
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Abstract
The invention discloses a method for restoring a video line synchronizing signal. The method comprises the following steps of: A, separating a line synchronizing signal and a field synchronizing signal out from an input video signal; B, if the input video signal is normal, directly outputting the video signal from an operating circuit, and if the input video signal lacks a certain line synchronizing signal pulse, executing a step C; and C, superposing a pulse signal on the output video signal, restoring the line synchronization of the video signal and outputting the video signal. The invention also correspondingly provides a system for restoring the video line synchronizing signal. Thus, the normal line synchronizing information can be restored under the condition that the video signal lacks a part of the line synchronizing signal, the video signal is restored to normal, and the circuit is simple and reliable.
Description
Technical field
The present invention relates to technical field of television sets, particularly relate to a kind of method and system recovering video line synchronization signal.
Background technology
A complete television video frequency signal is made up of picture signal and row, field sync signal and row, field blanking signal, if be interfered or other reasons cause the line synchronizing signal of some row to be lost, then screen display image out can be caused to occur the severe jamming such as distortion, chromatic distortion.
In summary, obviously there is inconvenience and defect in actual use, so be necessary to be improved in the export technique of the television video signal of described prior art.
Summary of the invention
For above-mentioned defect, the object of the present invention is to provide a kind of method and system recovering video line synchronization signal, it can make vision signal recover normal row synchronizing information when lacking partial row synchronizing signal, make vision signal recover normal, and circuit is simple, reliable.
To achieve these goals, the invention provides a kind of method recovering video line synchronization signal, described method comprises:
A, from input vision signal be separated trip, field sync signal;
If the vision signal of B input is normal, then directly export this vision signal from computing circuit; If the vision signal of input lacks certain line synchronizing signal pulse, then perform step C;
In C, the vision signal that exports that a pulse signal is added to, recover the row of described vision signal synchronous after exported.
According to the method for recovery video line synchronization signal of the present invention, described step C comprises further,
Generation one pulse signal synchronous with the synchronizing signal of incoming video signal is continued before C1, synchronization pulse on the scene occur;
C2, by postpone after pulse signal carry out amplitude modulation after export described computing circuit again to.
According to the method for recovery video line synchronization signal of the present invention, in described step B, if the vision signal of input is normal, then get rid of the superposition of other pulse signal.
According to the method for recovery video line synchronization signal of the present invention, described computing circuit is subtraction circuit.
The present invention provides a kind of system recovering video line synchronization signal accordingly, and described system comprises:
A line field synchronization separator, for being separated trip, field sync signal in the vision signal from input;
One computing circuit, direct outputting video signal when the vision signal for inputting is normal, when the vision signal of input lacks certain line synchronizing signal pulse, is then added in vision signal by a signal pulse, is exported when the row of recovery vision signal is synchronous again.
According to the system of recovery video line synchronization signal of the present invention, described system also comprises
The delayer of one video line time, continues generation one pulse signal synchronous with the synchronizing signal of incoming video signal before synchronization pulse on the scene occurs;
One modulation circuit, the amplitude of the signal pulse exported for regulating the delayer of described video line time, and the signal after amplitude modulation is outputted to described computing circuit.
According to the system of recovery video line synchronization signal of the present invention, described system also comprises the first switch and second switch; Delayer one end of described video line time is connected with described modulation circuit with the first switch by second switch, and second switch is directly connected with described row field synchronization separator simultaneously; First switch, for controlling the conducting of described modulation circuit, gets rid of the superposition of other pulse signal when the vision signal that described system is inputted is normal; The conducting within each video field time of described second switch, disconnects when synchronization pulse on the scene occurs.
According to the system of recovery video line synchronization signal of the present invention, described computing circuit is subtraction circuit.
According to the system of recovery video line synchronization signal of the present invention, described system also comprises the first NOT gate logic circuit, the second NOT gate logic circuit and NAND gate logical circuit, and delayer one end of described video line time is connected with described row field synchronization separator by the first NOT gate logic circuit, the second NOT gate logic circuit and NAND gate logical circuit.
The present invention, when the line synchronizing signal of vision signal is lost or damaged, is added in vision signal after a pulse signal is carried out amplitude modulation.Whereby, the present invention can make vision signal recover normal row synchronizing information when lacking partial row synchronizing signal, make vision signal recover normal, and circuit is simple, reliable.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram that the present invention recovers the system of video line synchronization signal;
Fig. 2 is the flow chart of steps that the present invention recovers the method for video line synchronization signal;
Fig. 3 is the flow chart of steps that the present invention recovers method one embodiment of video line synchronization signal.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Fig. 1 shows the circuit structure that the present invention recovers the system of video line synchronization signal, and the system 100 of this recovery video line synchronization signal comprises:
A line field synchronization separator A, for being separated trip, field sync signal in the vision signal from input.
One computing circuit C, direct outputting video signal when vision signal for inputting is normal, if when the vision signal of input lacks certain line synchronizing signal pulse, then a signal pulse is added in vision signal, the row of recovery vision signal is exported time synchronous again, preferably, this computing circuit C is subtraction circuit.
The delayer B of one video line time, continues generation one pulse signal synchronous with the synchronizing signal of incoming video signal before occurring for synchronization pulse on the scene.
One modulation circuit D, the amplitude of the signal pulse exported for regulating the delayer B of described video line time, and the signal after amplitude modulation is outputted to described computing circuit C.
First switch E, for whether controlling the conducting of modulation circuit D, when the vision signal that described system 100 is inputted is normal, does not have the superposition of other pulse signal.
Preferably, system 100 also comprises the first NOT gate logic circuit H, the second NOT gate logic circuit I, NAND gate logical circuit G and second switch F, as shown in Figure 1.
Delayer B one end of video line time is connected with row field synchronization separator A by the first NOT gate logic circuit H, the second NOT gate logic circuit I and NAND gate logical circuit G, the other end is connected with modulation circuit D with the first switch E by second switch F, and second switch F is directly connected with row field synchronization separator A simultaneously; The positive input terminal of computing circuit C is connected with the signal input part of row field synchronization separator A, and negative input end is connected with modulation circuit D.
Within each video field time, second switch F conducting, as long as row field synchronization separator A has a horizontal synchronizing pulse to export, generation one pulse signal synchronous with the synchronizing signal of incoming video signal will be continued in the delayer B of video line time, until field system chronizing impulse occurs, till second switch F disconnects.
When input signal is normal, when the delayer B of video line time exports positive pulse signal, row field synchronization separator A also exports a positive polarity horizontal pulse, and the first switch E is disconnected, the voltage that modulation circuit D produces is zero, whereby can not export vision signal on superimposed pulse.
When the vision signal inputted lacks certain line synchronizing signal pulse, the horizontal synchronizing pulse that row field synchronization separator A extracts from the vision signal of input also can be lost in this position.Row field synchronization separator A is output low level when the delayer B of video line time exports positive pulse, first switch E conducting, the pulse that the delayer B of video line time exports is added in the vision signal of output by computing circuit C, makes the line synchronizing signal of signal recover normal.
Circuit of the present invention is simple, reliable, and vision signal can be made when lacking partial row synchronizing signal to recover normal row synchronizing information, makes vision signal recover normal.
Fig. 2 is the flow chart of steps that the present invention recovers the method for video line synchronization signal, and it is realized by the system 100 recovering video line synchronization signal shown in Fig. 1, and the method comprises the steps:
S201, row field synchronization separator A are separated trip, field sync signal from the vision signal of input;
S202, if the vision signal of input is normal, then directly exports this vision signal from computing circuit C; If the vision signal of input lacks certain line synchronizing signal pulse, then perform step S203;
S203, is added to a pulse signal in the vision signal of output through computing circuit C, and the row recovering described vision signal is exported synchronously.
The method of the recovery video line synchronization signal provided in one embodiment of the invention, described method as shown in Figure 3, specifically comprises the steps:
S301, row field synchronization separator A are separated trip, field sync signal from the vision signal of input;
S302, vision signal is normal, exports this vision signal after getting rid of other pulse signal from computing circuit C; If the vision signal of input lacks certain line synchronizing signal pulse, then perform step S303;
S303, continues generation one pulse signal synchronous with the synchronizing signal of incoming video signal in the delayer B of video line time, until field system chronizing impulse occurs, till second switch F disconnects;
S304, delivers to the pulse signal after delay after modulation circuit D carries out amplitude modulation and exports computing circuit C again to, and then vision signal exported.
In sum, the present invention, when the line synchronizing signal of vision signal is lost or damaged, is added in vision signal after a pulse signal is carried out amplitude modulation.Whereby, the present invention can make vision signal recover normal row synchronizing information when lacking partial row synchronizing signal, make vision signal recover normal, and circuit is simple, reliable.
Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection range that all should belong to the claim appended by the present invention.
Claims (4)
1. recover a system for video line synchronization signal, it is characterized in that, described system comprises:
A line field synchronization separator, for being separated trip, field sync signal in the vision signal from input;
One computing circuit, direct outputting video signal when the vision signal for inputting is normal, when the vision signal of input lacks certain line synchronizing signal pulse, is then added in vision signal by a signal pulse, is exported when the row of recovery vision signal is synchronous again;
One modulation circuit, the amplitude of the signal pulse exported for regulating the delayer of described video line time, and the signal after amplitude modulation is outputted to described computing circuit;
Described system also comprises the first switch and second switch; Delayer one end of described video line time is connected with described modulation circuit with the first switch by second switch, and second switch is directly connected with described row field synchronization separator simultaneously; First switch, for controlling the conducting of described modulation circuit, gets rid of the superposition of other pulse signal when the vision signal that described system is inputted is normal; The conducting within each video field time of described second switch, disconnects when synchronization pulse on the scene occurs.
2. the system of recovery video line synchronization signal according to claim 1, it is characterized in that, described system also comprises
The delayer of one video line time, continues generation one pulse signal synchronous with the synchronizing signal of incoming video signal for synchronization pulse on the scene before occurring.
3. the system of recovery video line synchronization signal according to claim 1, is characterized in that, described computing circuit is subtraction circuit.
4. the system of recovery video line synchronization signal according to claim 1, it is characterized in that, described system also comprises the first NOT gate logic circuit, the second NOT gate logic circuit and NAND gate logical circuit, and delayer one end of described video line time is connected with described row field synchronization separator by the first NOT gate logic circuit, the second NOT gate logic circuit and NAND gate logical circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910190378.1A CN102025890B (en) | 2009-09-22 | 2009-09-22 | Method and system for restoring video line synchronizing signal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910190378.1A CN102025890B (en) | 2009-09-22 | 2009-09-22 | Method and system for restoring video line synchronizing signal |
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| CN102025890A CN102025890A (en) | 2011-04-20 |
| CN102025890B true CN102025890B (en) | 2015-01-28 |
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| CN105933574B (en) * | 2016-05-20 | 2019-05-21 | 南京邮电大学 | It goes in video, the separation system of field sync signal |
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|---|---|---|---|---|
| US6130718A (en) * | 1996-05-14 | 2000-10-10 | Thomson Licensing S.A. | Method and device for correcting errors in the opening of time windows for recovering data with horizontal synchronization pulses |
| CN1297642A (en) * | 1998-12-16 | 2001-05-30 | 三洋电机株式会社 | Hirozontal synchronization circuit |
| US6271888B1 (en) * | 1997-08-27 | 2001-08-07 | Deutschethomson-Brandt Gmbh | Method for obtaining line synchronization information items from a video signal, and apparatus for carrying out the method |
| CN1496106A (en) * | 2002-09-16 | 2004-05-12 | Lg电子株式会社 | Restoring equipment and method for mobile signal and synchronous signal |
| CN1925593A (en) * | 2005-08-30 | 2007-03-07 | 乐金电子（沈阳）有限公司 | Allowable data signal processing device for interactive digital video system interface |
| CN101466048A (en) * | 2009-01-09 | 2009-06-24 | 华亚微电子（上海）有限公司 | Digital demodulation method for non-synchronous composite video signal and S video signal |
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2009
- 2009-09-22 CN CN200910190378.1A patent/CN102025890B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6130718A (en) * | 1996-05-14 | 2000-10-10 | Thomson Licensing S.A. | Method and device for correcting errors in the opening of time windows for recovering data with horizontal synchronization pulses |
| US6271888B1 (en) * | 1997-08-27 | 2001-08-07 | Deutschethomson-Brandt Gmbh | Method for obtaining line synchronization information items from a video signal, and apparatus for carrying out the method |
| CN1297642A (en) * | 1998-12-16 | 2001-05-30 | 三洋电机株式会社 | Hirozontal synchronization circuit |
| CN1496106A (en) * | 2002-09-16 | 2004-05-12 | Lg电子株式会社 | Restoring equipment and method for mobile signal and synchronous signal |
| CN1925593A (en) * | 2005-08-30 | 2007-03-07 | 乐金电子（沈阳）有限公司 | Allowable data signal processing device for interactive digital video system interface |
| CN101466048A (en) * | 2009-01-09 | 2009-06-24 | 华亚微电子（上海）有限公司 | Digital demodulation method for non-synchronous composite video signal and S video signal |
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