CN1194542C - Method and device for realizing horizontal scanning synchronism of HDTV - Google Patents
Method and device for realizing horizontal scanning synchronism of HDTV Download PDFInfo
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- CN1194542C CN1194542C CNB021243360A CN02124336A CN1194542C CN 1194542 C CN1194542 C CN 1194542C CN B021243360 A CNB021243360 A CN B021243360A CN 02124336 A CN02124336 A CN 02124336A CN 1194542 C CN1194542 C CN 1194542C
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Abstract
The present invention relates to a method used for realizing line synchronization of a high-definition television (HDTV) and a device thereof. A synchronous pulse which is obtained by filtering a serrated pulse as much again as line frequency in a field-synchronizing signal passes through filtering and shaping to obtain a stander line synchronizing signal, and is sent to a display processing part so as to realize the elimination of image top distortion. Then, the synchronizing pulse which is obtained by filtering the serrated pulse as much again as the line frequency in the field-synchronizing signal passes through a corresponding line blanking pulse, to synchronously move forward or backward, and then, after filtered and shaped, obtains the line synchronizing signal to realize the correction for line center offset. The present invention has the advantages of convenient parameter adjustment, low cost, simplicity, reliability and obvious use effect.
Description
Technical field:
The present invention relates to a kind of synchronous method and device thereof of high definition TV (HDTV) line scanning that be used to realize, be particularly related to by processing, and then realize the elimination of high definition TV (HDTV) large screen display image top distortion and the correction at row center high definition TV (HDTV) line synchronizing signal.
Background technology:
The display interface of high definition TV (HDTV) can divide for the primary colour signal that is made of R, G, B signal and usually by two kinds of Y, Pb, Pr (HD, the VD) component signals that signal constituted.Wherein HD and VD signal are respectively line synchronizing signal and field sync signal.
When display interface is component signal, again in two kinds of situation: first kind is that HD and VD signal are independent of Y, Pb, Pr component signal respectively, and transmits simultaneously with them, and the display interface of this moment is five line interface modes: i.e. Y, Pb, Pr, HD, VD; Another kind is that HD and VD signal packet are contained among the luminance component signal Y, the display interface of this moment is three-wire interface mode: Y, Pb, Pr, under second kind of situation, need from luminance component signal Y, to separate earlier trip, field sync signal HD and VD, could normal presentation of displayed picture.
By above-mentioned analysis as can be known:, then need from luminance component signal Y, to separate trip, field sync signal, again to synchronization line, field scan oscillating impulse generator if be not with row, field sync signal HD and VD in the component signal of display interface.
But at present in high definition TV (HDTV), use the universal integrated circuit IC of separated in synchronization mostly, in the line synchronizing signal of resulting separation, be mixed with field sync signal like this, and because of the serrated pulse that is twice in line frequency is arranged during field sync signal, so during presentation of displayed picture, during field sync signal was carried out, line oscillator can be synchronized with two times of line frequencies, and after field sync signal is finished, can be synchronized with the signal line frequency again.Owing to need certain hour synchronously, to change and be synchronized with before the line frequency from being synchronized with two times of line frequencies, field scan trace begins, so can see twisted phenomena at the image frame top.This is one of existing problem.
In addition, because of China's high definition television (HDTV) display format blanking time is grown (being 9.9 μ s), and the back edge of the too close blanking pulse of synchronous head (behind the synchronous head along behind blanking pulse along 2.1 μ s only), causing like this when showing, image is too taken back.If be used to show that the phase place adjusting range of processing integrated circuit IC is not enough, just image can not be transferred to the position of center.And the method for existing adjustment machine center, the one, circuit structure more complicated, the 2nd, circuit power consumption is big, the 3rd, the circuit adjusting range is less, and when display mode for a long time, be difficult to compatible various signal.This is two of an existing problem.
Summary of the invention:
The objective of the invention is for solve high definition TV (HDTV) the distortion of ubiquitous visual top and China exclusive capable off-centring, and provide a kind of synchronous method and device thereof of high definition TV (HDTV) line scanning of realizing.
Because of in high definition TV (HDTV), in the resulting line synchronizing signal of separated in synchronization, be mixed with field sync signal, and during field sync signal, have the serrated pulse that is twice in line frequency; Moreover longer at China's high definition TV peculiar form blanking time, and the skew at the capable center that causes.Based on this, design of the present invention is: the one, solve the serrated pulse that is twice in line frequency during the field sync signal; The 2nd, solve the adjusting range of synchronous head with respect to blanking pulse.
The present invention is achieved in that
A kind of method that realizes that the high definition TV line scanning is synchronous goes out after the line synchronizing signal through separated in synchronization from component signal, also comprises:
First step by being twice in the serrated pulse of line frequency in the filtering field sync signal, with resulting lock-out pulse, obtains the line synchronizing signal of standard through filter shape, to showing the processing section, realizes the elimination to the image top distortion;
Second step: will be by being twice in the resulting lock-out pulse of serrated pulse of line frequency in the filtering field sync signal, through horizontal blanking impulse relatively move forward synchronously or after move, the line synchronizing signal that obtains behind filter shape again realizes the correction to the row off-centring.
Described from field sync signal to the filtering that is twice in the line frequency serrated pulse, relatively the synchronous reach carried out of horizontal blanking impulse or after move and filter shape is to realize by the monostable trigger that can not heavily trigger.
Described from field sync signal to the filtering that is twice in the line frequency serrated pulse, be to realize to the filter shape of lock-out pulse by the monostable trigger that can not heavily trigger.
The synchronous reach that described relative horizontal blanking impulse carries out or after move and filter shape is to realize by the monostable trigger that can not heavily trigger.
Described from field sync signal the filtering to the serrated pulse that is twice in line frequency realize by monostable flipflop is set timing.
The synchronous reach that described relative horizontal blanking impulse carries out or after move by monostable flipflop is set timing and realize.
Described filter shape is realized by monostable flipflop is set timing.
Described from field sync signal to the timing of the serrated pulse filtering that is twice in line frequency between T/2 and T, T is the line synchronizing signal cycle.
Describedly from field sync signal, adopt rising edge to trigger to the serrated pulse filtering that is twice in line frequency.
The filter shape that lock-out pulse behind the described serrated pulse that filtering is twice in line frequency carries out adopts rising edge to trigger, and sets regularly through the line synchronizing signal of filter shape outputting standard obtaining.
The synchronous reach that described relative horizontal blanking impulse carries out or after the timing that moves be T-t or T+t, t for reach relatively or after time of moving.
The synchronous reach that described relative horizontal blanking impulse carries out or after move and adopt rising edge to trigger.
The described synchronous reach that relative blanking pulse is carried out or after the filter shape of the lock-out pulse that moves adopt trailing edge to trigger, set regularly through the line synchronizing signal of filter shape output obtaining.
A kind of device of realizing that the high definition TV line scanning is synchronous; This device comprises at least:
A filtering circuit is used for the serrated pulse that the filtering field sync signal is twice in line frequency, and obtains lock-out pulse;
One first filtering shaping circuit is used for lock-out pulse is carried out filter shape, obtains the line synchronizing signal of standard, to showing the processing section, realizes the elimination to the image top distortion;
A shift circuit is used for and will be twice in the resulting lock-out pulse of serrated pulse of line frequency by filtering, through relative horizontal blanking impulse move forward synchronously or after move;
One second filtering shaping circuit is used for carrying out filter shape through the resulting lock-out pulse that is shifted, and realizes the adjustment to the row off-centring.
The described filtering circuit and first filtering shaping circuit are made of unrepeatable monostable flipflop.
The described shift circuit and second filtering shaping circuit are made of unrepeatable monostable flipflop.
The timing that the described filtering circuit that is made of monostable flipflop is set is between T/2 and T, and T is the line synchronizing signal cycle.
Described first filtering shaping circuit that is made of monostable flipflop is set at rising edge and triggers.
Described first filtering shaping circuit that is made of monostable flipflop adopts rising edge to trigger, to obtain setting timing through the line synchronizing signal of filter shape outputting standard.
The timing that the described shift circuit that is made of monostable flipflop is set is T-t or T+t, t for reach relatively or after time of moving.
The described shift circuit that is made of monostable flipflop is set at rising edge and triggers.
Described second filtering shaping circuit that is made of monostable flipflop adopts trailing edge to trigger, to obtain setting timing through the line synchronizing signal of filter shape outputting standard.
Described line synchronizing signal is transported to filtering circuit through emitter follower.
This device is located at the front end of counter frequently of being expert at of high-definition television.
Effect of the present invention: adopting general digital device monostable flipflop, specifically is to realize by timing setting and triggering mode to monostable flipflop, and parameter adjustment therefore of the present invention is convenient, cost is low, simple and reliable, and result of use is remarkable.In addition because of filtering effectively be twice in the serrated pulse of line frequency, make the present invention except using after the line synchronizing signal after separated in synchronization, can also use the front end of counter frequently of being expert at, and guarantee the counter steady operation that count results is accurately and reliably.
Description of drawings
Fig. 1 is a circuit block diagram of the present invention.
Fig. 2 is the concrete circuit theory diagrams of implementing of the present invention.
Fig. 3 is the time chart that the present invention specifically implements coherent signal in the circuit.
Specific embodiments
As shown in drawings: what provide is to utilize general digital device monostable trigger that detailed implementation process of the present invention is described.
At first the timing with first monostable flipflop is made as greater than T/2 (T is the line synchronizing signal cycle) less than T, the selection rising edge triggers, filter with this serrated pulse that is twice in line frequency during with field sync signal, and then select rising edge to trigger with its filter shape, thereby obtain the line synchronizing signal of standard, the line synchronizing signal of this standard is sent into the demonstration processing section, then can solve the distortion of visual top.
Then after will filtering serrated pulse, regularly trigger by the second monostable trigger rising edge again, timing can be determined according to the relative position of row synchronous head and blanking pulse, select trailing edge to trigger again the signal that obtains and through filter shape, synchronizing signal that then obtains and original comparing, variation (reach or then move) has relatively taken place in the position of synchronous head, thereby reaches the purpose of proofreading and correct the row center.
In conjunction with Fig. 2, line synchronizing signal is sent into monostable flipflop IC1402 through emitter follower, timing constant τ is decided by the product of R1407 and C1404, if signal format is more, just must meet the following conditions: Tmax/2＜τ＜Tmin, in the formula, Tmax represents the cycle of the line synchronizing signal that line frequency is minimum in the various forms; Tmin represents the cycle of the line synchronizing signal that line frequency is the highest in the various forms; The selection rising edge triggers, then 13 pin are output as the lock-out pulse that filters two times of line frequency serrated pulses, and 10 pin are sent in this pulse, and it is standard value that the value of suitably choosing R1406, C1403 can make the synchronous head pulse duration of 5 pin output, this signal is sent into the display part, then can solve the distortion of visual top.
Again in conjunction with Fig. 2, the lock-out pulse that again output of IC1402 the 13rd pin has been filtered serrated pulse is sent into 2 pin of IC1403, still select rising edge to trigger, timing constant τ adjusts the product of R1409 and C1406 as required and can realize, then the signal of 13 pin output is sent into 9 pin, the selection trailing edge triggers, and adjusts the value of R1408 and C1405, makes the line synchronizing signal of 5 pin outputting standard pulse durations.After the line synchronizing signal of China's high definition TV (HDTV) handled through the present invention, be equivalent to the position of the relative horizontal blanking impulse of row synchronous head toward reach, thereby solve the row off-centring.
It is example that Fig. 3 has provided with China's high definition TV (HDTV) display format, to the process and the result of line synchronizing signal processing.The serrated pulse 3 that contains synchronizing signal 1, field sync signal 2 and be positioned at field sync signal in the line synchronizing signal (Hin) of input, serrated pulse be spaced apart T/2 (frequency that is serrated pulse is two times of line frequencies), serrated pulse 3 back along corresponding row synchronizing signal starting point.The signal at A point place has not contained serrated pulse after IC1402 handles, and filter shape can outputting standard line synchronizing signal Hout1.
Again in conjunction with Fig. 3, the row center is proofreaied and correct, then A point signal is sent into IC1403 again, timing is adjusted as required, if shift time is t before needing relatively, then timing is (T-t), B among 13 pin signal output waveforms such as the figure, again this signal is selected that trailing edge triggers, the line synchronizing signal Hout2 of shift time t before filter shape just can obtain the relative horizontal blanking impulse of capable synchronous head, promptly with the desynchronize signal of lastrow of the synchronizing signal of back delegation, be equivalent to synchronous reach, this processing a kind of thinking cleverly of can yet be regarded as.Because of the phase-locked loop time constant is bigger, so demonstration does not constitute influence to signal.
In addition, the present invention also can use the line frequency counter front end at high definition TV (HDTV).Before the present invention, be directly used in counting if the line synchronizing signal that goes out through separated in synchronization is untreated, then the influence because of serrated pulse can cause unstable other circuit working that influences of counting.Use after the present invention, because of filtering serrated pulse, then can guarantee the counter steady operation, count results accurately and reliably.
The corresponding technical application scheme that is produced based on the present invention's design should be considered as protection scope of the present invention.
Claims (24)
1. a method that realizes that the high definition TV line scanning is synchronous goes out after the line synchronizing signal through separated in synchronization from component signal, also comprises:
First step by being twice in the serrated pulse of line frequency in the filtering field sync signal, with resulting lock-out pulse, obtains the line synchronizing signal of standard through filter shape, to showing the processing section, realizes the elimination to the image top distortion;
Second step: will be by being twice in the resulting lock-out pulse of serrated pulse of line frequency in the filtering field sync signal, through horizontal blanking impulse relatively move forward synchronously or after move, the line synchronizing signal that obtains behind filter shape again realizes the correction to the row off-centring.
2. the method that realization high definition TV as claimed in claim 1 line scanning is synchronous, described from field sync signal to the filtering that is twice in the line frequency serrated pulse, relatively the synchronous reach carried out of horizontal blanking impulse or after move and filter shape is to realize by the monostable trigger that can not heavily trigger.
3. the method that realization high definition TV as claimed in claim 1 line scanning is synchronous, described from field sync signal to the filtering that is twice in the line frequency serrated pulse, be to realize to the filter shape of lock-out pulse by the monostable trigger that can not heavily trigger.
4. the method that realization high definition TV as claimed in claim 1 line scanning is synchronous, the synchronous reach that described relative horizontal blanking impulse carries out or after move and filter shape is to realize by the monostable trigger that can not heavily trigger.
5. the method that realization high definition TV as claimed in claim 1 line scanning is synchronous, described from field sync signal the filtering to the serrated pulse that is twice in line frequency realize by monostable flipflop is set timing.
6. the method that realization high definition TV as claimed in claim 1 line scanning is synchronous, the synchronous reach that described relative horizontal blanking impulse carries out or after move by monostable flipflop is set timing and realize.
7. the method that realization high definition TV as claimed in claim 1 line scanning is synchronous, described filter shape is realized by monostable flipflop is set timing.
8. as claim 1 or the synchronous method of 3 described realization high definition TV line scannings, described from field sync signal to the timing of the serrated pulse filtering that is twice in line frequency between T/2 and T, T is the line synchronizing signal cycle.
9. as claim 1 or the synchronous method of 3 described realization high definition TV line scannings, describedly from field sync signal, adopt rising edge to trigger to the serrated pulse filtering that is twice in line frequency.
10. as claim 1 or the synchronous method of 3 or 5 described realization high definition TV line scannings, the filter shape that lock-out pulse behind the described serrated pulse that filtering is twice in line frequency carries out adopts rising edge to trigger, and sets regularly through the line synchronizing signal of filter shape outputting standard obtaining.
11. as claim 1 or the synchronous method of 4 described realization high definition TV line scannings, the synchronous reach that described relative horizontal blanking impulse carries out or after the timing that moves be T-t or T+t, t for reach relatively or after time of moving.
12. as claim 1 or the synchronous method of 4 described realization high definition TV line scannings, the synchronous reach that described relative horizontal blanking impulse carries out or after move and adopt rising edge to trigger.
13. as claim 1 or the synchronous method of 4 or 5 described realization high definition TV line scannings, the described synchronous reach that relative blanking pulse is carried out or after the filter shape of the lock-out pulse that moves adopt trailing edge to trigger, set regularly through the line synchronizing signal of filter shape output obtaining.
14. device of realizing that the high definition TV line scanning is synchronous; This device comprises at least:
A filtering circuit is used for the serrated pulse that the filtering field sync signal is twice in line frequency, and obtains lock-out pulse;
One first filtering shaping circuit is used for lock-out pulse is carried out filter shape, obtains the line synchronizing signal of standard, to showing the processing section, realizes the elimination to the image top distortion;
A shift circuit is used for and will be twice in the resulting lock-out pulse of serrated pulse of line frequency by filtering, through relative horizontal blanking impulse move forward synchronously or after move;
One second filtering shaping circuit is used for carrying out filter shape through the resulting lock-out pulse that is shifted, and realizes the adjustment to the row off-centring.
15. the device that realization high definition TV as claimed in claim 14 line scanning is synchronous, the described filtering circuit and first filtering shaping circuit are made of unrepeatable monostable flipflop.
16. the device that realization high definition TV as claimed in claim 14 line scanning is synchronous, the described shift circuit and second filtering shaping circuit are made of unrepeatable monostable flipflop.
17. as claim 14 or the synchronous device of 15 described realization high definition TV line scannings, the timing that the described filtering circuit that is made of monostable flipflop is set is between T/2 and T, T is the line synchronizing signal cycle.
18. the device that realization high definition TV as claimed in claim 17 line scanning is synchronous, described first filtering shaping circuit that is made of monostable flipflop are set at rising edge and trigger.
19. as claim 14 or the synchronous device of 15 described realization high definition TV line scannings, described first filtering shaping circuit that is made of monostable flipflop adopts rising edge to trigger, to obtain setting timing through the line synchronizing signal of filter shape outputting standard.
20. as claim 14 or the synchronous device of 16 described realization high definition TV line scannings, the timing that the described shift circuit that is made of monostable flipflop is set is T-t or T+t, t for reach relatively or after time of moving.
21. the device that realization high definition TV as claimed in claim 20 line scanning is synchronous, the described shift circuit that is made of monostable flipflop are set at rising edge and trigger.
22. as claim 14 or the synchronous device of 16 described realization high definition TV line scannings, described second filtering shaping circuit that is made of monostable flipflop adopts trailing edge to trigger, to obtain setting timing through the line synchronizing signal of filter shape outputting standard.
23. as claim 14 or the synchronous device of 15 or 16 described realization high definition TV line scannings, described line synchronizing signal is transported to filtering circuit through emitter follower.
24. as claim 14 or the synchronous device of 15 or 16 described realization high definition TV line scannings, this device is located at the front end of counter frequently of being expert at of high-definition television.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021243360A CN1194542C (en) | 2002-06-19 | 2002-06-19 | Method and device for realizing horizontal scanning synchronism of HDTV |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021243360A CN1194542C (en) | 2002-06-19 | 2002-06-19 | Method and device for realizing horizontal scanning synchronism of HDTV |
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| Publication Number | Publication Date |
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| CN1386014A CN1386014A (en) | 2002-12-18 |
| CN1194542C true CN1194542C (en) | 2005-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB021243360A Expired - Fee Related CN1194542C (en) | 2002-06-19 | 2002-06-19 | Method and device for realizing horizontal scanning synchronism of HDTV |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025894B (en) * | 2010-12-25 | 2013-04-10 | 广东威创视讯科技股份有限公司 | Synchronizing signal distortion correcting circuit of video signal |
| CN104320564B (en) * | 2014-10-22 | 2018-03-16 | 中国电子科技集团公司第四十一研究所 | It is a kind of that the synchronous method of vision signal triggering is realized based on FPGA |
| CN104539267A (en) * | 2014-12-25 | 2015-04-22 | 重庆机床(集团)有限责任公司 | Zero-crossing synchronization pulse signal circuit of power grid |
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Assignee: Guangzhou Digital Technology Co., Ltd. Leroy Assignor: TCL Kingbrand Electronic (Shenzhen) Co., Ltd. Contract fulfillment period: 2005.11.15 to 2010.11.14 contract change Contract record no.: 2008990000660 Denomination of invention: Method and device for realizing horizontal scanning synchronism of HDTV Granted publication date: 20050323 License type: Exclusive license Record date: 20081010 |
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