CN102075723A - Switching device and switching method of asynchronous videos - Google Patents
Switching device and switching method of asynchronous videos Download PDFInfo
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- CN102075723A CN102075723A CN 201110002708 CN201110002708A CN102075723A CN 102075723 A CN102075723 A CN 102075723A CN 201110002708 CN201110002708 CN 201110002708 CN 201110002708 A CN201110002708 A CN 201110002708A CN 102075723 A CN102075723 A CN 102075723A
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Abstract
The invention discloses a switching device and a switching method of asynchronous videos. A video signal acquisition module is connected with each video source to be switched, recognizes the system of each video and acquires line field signals of multiple paths of asynchronous videos respectively; a black video signal generating module generates a black video signal and inputs the black video signal to a video switching module; and a black video line field signal adjusting module adjusts the line field period of the black video signal according to different line field periods of the video sources, performs signal synchronization on each black video signal and a corresponding video source, generates a black burst by using the black video signal generating module during video switching and changes the system and the line field period in a black period, so that image splitting and hopping during switching are eliminated.
Description
Technical field
The present invention relates to the technical field of video monitoring, be a kind of black video signal generating module generation black burst that when video switch, utilize specifically, in the black field duration, change standard and row field duration, thereby eliminate the switching device shifter and the changing method of the non-synchronous video of image division and saltus step when switching.
Background technology
At present, existing in the world colour television standard has four kinds at present: TSC-system, Phase Alternation Line system, Sequential Color and Memory system, HDTV.Here two kinds of wherein main video formats of main general introduction: TSC-system, Phase Alternation Line system.The NTSC color television system is the colourcast standard of nineteen fifty-two National Television System Committee's definition, be called quadrature amplitude balance system, but because TSC-system exists phase sensitive to cause the shortcoming of color distortion, therefore Germany formulated the PAL colour TV system broadcast standard with 1962, was called line-by-line inversion quadrature amplitude balance system.
The branch that scanning has interlacing scan and lines by line scan.In surface sweeping line by line, electron beam has scanned one time at display screen and has just shown a complete image from the lower right corner that progressively scans that display screen upper left corner delegation meets delegation.In interlacing scan, electron beam has been swept the position of getting back to the 3rd row beginning behind the 1st row and has then been swept, and then 5,7 ... scanning on the row is until last column.Then sweep even number line after odd line interlace is intact, so just finished the scanning of a frame.Can see that thus an interleaved two field picture is made up of two parts: a part is made up of odd-numbered line, is called odd field, and another part is made up of even number line, is called even field, and two occasions get up to form a frame.
Summarize the scan characteristic of Phase Alternation Line system, TSC-system below
Phase Alternation Line system: total line number of a two field picture is 625 row, divides two field scans.Line-scanning frequency is 15625 Hz, and the cycle is 64 us; Field-scanning period is 50 Hz, and the cycle is 20 ms; Frame per second is 25 Hz, is half of field frequency, and the cycle is 40 ms.When the transmission TV signal, the time of transmitted image is 52.2 us in each row, and remaining 11.8 us is transmitted image not, is the inverse process time of line scanning, is used as row simultaneously and reaches blanking usefulness synchronously.The number of scanning lines of each is that 625/2=312.5 is capable, and wherein 25 row are made field retrace, transmitted image not, and every of the line number of transmitted image has only 287.5 row, and therefore every frame has only 575 row to have image to show.Shown in Figure 1 is the TV signal (black-and-white system) of a line period.
TSC-system: total line number of a two field picture is 525 row, divides two field scans.Line-scanning frequency is 15750 Hz, and the cycle is 63.5 us; Field-scanning period is 60 Hz, and the cycle is 16.67 ms; Frame per second is 30 Hz, and the cycle is 33.33ms.The number of scanning lines of each is that 525/2=262.5 is capable.Except two field retrace, the line number of actual transmitted image is 480 row.
But, there is following not enough point in the aforesaid prior art:
Most of monitor video switches the synchronous switching that product is not all supported non-synchronous video in the prior art, if midway in a certain field of scanning, vision signal just is cut off, introduce another nonsynchronous vision signal simultaneously, promptly when switching different video source video, because different video source row field signal is asynchronous, will when switching, cause a very big switching to disturb, make image division, the saltus step of monitor, just enter stable state then, will bring certain visual impact to the user like this.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of black video signal generating module generation black burst that utilize when video switch, in the black field duration, change standard and row field duration, thereby eliminate the switching device shifter and the changing method of the non-synchronous video of image division and saltus step when switching.
The technical scheme that the present invention takes for the technical problem that exists in the solution known technology is:
The switching device shifter of non-synchronous video of the present invention, comprise: a plurality of video source that comprising nonsynchronous vision signal, receive the also monitor of display video signal, connect a plurality of video source and selectivity video frequency switching module, also comprise: video signal collective module, a black video signal generating module and a black video line field signal adjustment module to monitor switching outputting video signal; The video signal collective module is connected with to be switched each video source, discerns the standard of each video, gathers the row field signal of multichannel non-synchronous video simultaneously respectively; A black video signal generating module produces a black vision signal, and black video signal generating module respectively with different video source and video frequency switching module between video signal path be connected, will deceive a vision signal and input to video frequency switching module; Black video line field signal adjustment module is connected with black video signal generating module with the video signal collective module respectively, according to the capable field duration of the different black vision signal of capable field duration adjusting of video source, make the signal Synchronization of each black vision signal and corresponding video source generation.
The present invention can also adopt following technical measures:
Above-mentioned monitor is provided with the OSD video superposition controller.
The changing method of non-synchronous video of the present invention, concrete steps are as follows:
I, video frequency switching module begin formerly asynchronous and switch between rear video;
After V, the collection of video signal collective module switch at the rear video row field signal, and the capable long period and the standard of this vision signal transferred to a black field video line field signal adjustment module;
VI, black video line field signal adjustment module are according to capable field duration and black video signal generating module work of standard control at the rear video signal, make it change the capable field duration and the standard of a black vision signal, make it and have identical capable field duration and standard at the rear video signal;
VII, replace and black synchronous vision signal of vision signal formerly, on monitor, show black with black vision signal in the rear video signal Synchronization;
VIII, stop output with black vision signal in the rear video signal Synchronization, input is at the rear video signal, and video switch is finished.
The present invention can also adopt following technical measures:
Be input to monitor at the rear video signal after capable field duration of vision signal formerly finishes, the uncompleted cycle replenishes with a black vision signal during switching.
The capable synchronizing cycle of black vision signal and field sync period reach in that the rear video signal is corresponding with the vision signal formerly of correspondence and make adjusting.
Advantage and good effect that the present invention has are:
Comprise in the switching device shifter of non-synchronous video of the present invention: the video signal collective module, black video signal generating module and black video line field signal adjustment module, black field video line field signal adjustment module collects according to the video signal collective module, vision signal formerly before and after switching and the feature of deceiving a vision signal in the capable field duration and the standard change of rear video signal, nonsynchronous vision signal is switched in the black vision signal to be finished, when video switch, when vision signal formerly scans certain delegation and is cut off, at the rear video signal is not to be introduced at once, but introduce black the vision signal that black video signal generating module produces earlier, and adjust the capable field duration of black burst and standard makes it and formerly vision signal is consistent, up to formerly the scan period of vision signal finishes.Back and adjustment are deceived the capable field duration of a vision signal and at the rear video aligned phase signal, are cut off and deceive a field vision signal, with new being incorporated in the synchronous switching device in the rear video switching signal.In the handoff procedure, a vision signal is deceived in one artificial in vision signal of adding, because the time of a field signal is very short, simultaneously because the inertia of human eye, visually nonsynchronous black vision signal switched and can't be discovered, so avoided nonsynchronous video image to divide the visual impact that brings to the user.
Description of drawings
Fig. 1 is the schematic diagram of the vision signal of a line period;
Fig. 2 is the schematic diagram of a black vision signal in the handoff procedure;
Fig. 3 is switching sequence figure in the changing method of non-synchronous video of the present invention;
Fig. 4 is the signal flow graph of the changing method of non-synchronous video of the present invention.
Embodiment
It is following that the present invention will be described in detail with reference to drawings and Examples.
Fig. 1 is the schematic diagram of the vision signal of a line period; Fig. 2 is the schematic diagram of a black vision signal in the handoff procedure; Fig. 3 is switching sequence figure in the changing method of non-synchronous video of the present invention; Fig. 4 is the signal flow graph of the changing method of non-synchronous video of the present invention.
As shown in Figures 1 to 4, monitor all will restart the scanning of another row signal after every scanning delegation signal.With the Phase Alternation Line system is example, and after having scanned 625 row, just after 1 frame, monitor has begun the scanning of time 1 vision signal.If vision signal just is cut off, and introduces another nonsynchronous vision signal simultaneously a certain of scanning midway, the phenomenon that causes is exactly to show that on monitor a very big video switch disturbs, and makes image division, saltus step.The simple principle that audio video synchronization is switched is exactly, finish in each vision signal scanning, promptly the new field vision signal rescan beginning the time introducing new video signal.Will avoid introducing the interference that the video switch signal causes so midway.
The switching device shifter of the non-synchronous video among the present invention, comprise: a plurality of video source that comprising nonsynchronous vision signal, receive the also monitor of display video signal, connect a plurality of video source and selectivity video frequency switching module, also comprise: video signal collective module, a black video signal generating module and a black video line field signal adjustment module to monitor switching outputting video signal; The video signal collective module is connected with to be switched each video source, discerns the standard of each video, gathers the row field signal of multichannel non-synchronous video simultaneously respectively; A black video signal generating module produces a black vision signal, and black video signal generating module respectively with different video source and video frequency switching module between video signal path be connected, will deceive a vision signal and input to video frequency switching module; Black video line field signal adjustment module is connected with black video signal generating module with the video signal collective module respectively, according to the capable field duration of the different black vision signal of capable field duration adjusting of video source, make the signal Synchronization of each black vision signal and corresponding video source generation.
The switching device shifter of non-synchronous video can integrated setting and same FPGA single-chip in, to have reduced production cost and use cost.The row field of deceiving a black vision signal of video signal generating module generation is adjustable, and the variation of row field duration is subjected to the influence of video signal collective module, switches the connections of vision signals successively to being applied to two respectively.When switching, when formerly video was cut off, a black vision signal was finished to keep when the scanning of front court as input signal.Simultaneously, change the capable field duration of self, will be synchronized with in black vision signal of back Switch Video and introduce, finish the switching between the different rows field duration signal, will introduce at the rear video signal again and replace a black vision signal.
Above-mentioned monitor is provided with the OSD video superposition controller, can be intuitively monitor be carried out corresponding modify and setting on the parameter.
The changing method of non-synchronous video of the present invention, concrete steps are as follows:
I, video frequency switching module begin formerly asynchronous and switch between rear video;
After V, the collection of video signal collective module switch at the rear video row field signal, and the capable long period and the standard of this vision signal transferred to a black field video line field signal adjustment module;
VI, black video line field signal adjustment module are according to capable field duration and black video signal generating module work of standard control at the rear video signal, make it change the capable field duration and the standard of a black vision signal, make it and have identical capable field duration and standard at the rear video signal;
VII, replace and black synchronous vision signal of vision signal formerly, on monitor, show black with black vision signal in the rear video signal Synchronization;
VIII, stop output with black vision signal in the rear video signal Synchronization, input is at the rear video signal, and video switch is finished.
Be input to monitor at the rear video signal after capable field duration of vision signal formerly finishes, the uncompleted cycle replenishes with a black vision signal during switching.
The capable synchronizing cycle of black vision signal and field sync period reach in that the rear video signal is corresponding with the vision signal formerly of correspondence and make adjusting.
For guaranteeing the speed of service of system, improve usage factor of system resource, the collection of video signal module is not real-time each road video is gathered, but when carrying out switching, the two-path video that switches is gathered, and this just saves a large amount of resources for system.
Comprise in the switching device shifter of non-synchronous video of the present invention: the video signal collective module, black video signal generating module and black video line field signal adjustment module, black field video line field signal adjustment module collects according to the video signal collective module, vision signal formerly before and after switching and the feature of deceiving a vision signal in the capable field duration and the standard change of rear video signal, nonsynchronous vision signal is switched in the black vision signal to be finished, when video switch, when vision signal formerly scans certain delegation and is cut off, at the rear video signal is not to be introduced at once, but introduce black the vision signal that black video signal generating module produces earlier, and adjust the capable field duration of black burst and standard makes it and formerly vision signal is consistent, up to formerly the scan period of vision signal finishes.Back and adjustment are deceived the capable field duration of a vision signal and at the rear video aligned phase signal, are cut off and deceive a field vision signal, with new being incorporated in the synchronous switching device in the rear video switching signal.In the handoff procedure, a vision signal is deceived in one artificial in vision signal of adding, because the time of a field signal is very short, simultaneously because the inertia of human eye, visually nonsynchronous black vision signal switched and can't be discovered, so avoided nonsynchronous video image to divide the visual impact that brings to the user.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention with preferred embodiment openly as above, yet, be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, certainly can utilize the technology contents of announcement to make a little change or modification, become the equivalent embodiment of equivalent variations, be the content that does not break away from technical solution of the present invention in every case, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all belong in the scope of technical solution of the present invention.
Claims (5)
1. the switching device shifter of a non-synchronous video, comprise: a plurality of video source that comprising nonsynchronous vision signal, receive the also monitor of display video signal, connect a plurality of video source and selectivity video frequency switching module, it is characterized in that: also comprise: video signal collective module, a black video signal generating module and a black video line field signal adjustment module to monitor switching outputting video signal; The video signal collective module is connected with to be switched each video source, discerns the standard of each video, gathers the row field signal of multichannel non-synchronous video simultaneously respectively; A black video signal generating module produces a black vision signal, and black video signal generating module respectively with different video source and video frequency switching module between video signal path be connected, will deceive a vision signal and input to video frequency switching module; Black video line field signal adjustment module is connected with black video signal generating module with the video signal collective module respectively, according to the capable field duration of the different black vision signal of capable field duration adjusting of video source, make the signal Synchronization of each black vision signal and corresponding video source generation.
2. according to the switching device shifter of right 1 described non-synchronous video, it is characterized in that: above-mentioned monitor is provided with the OSD video superposition controller.
3. changing method based on the non-synchronous video of the described device of claim 1, concrete steps are as follows:
I, video frequency switching module begin formerly asynchronous and switch between rear video;
The preceding field signal of video line is formerly switched in II, the collection of video signal collective module, and the capable long period and the standard of this vision signal transferred to a black video line field signal adjustment module;
III, black video line field signal adjustment module be according to capable field duration and black video signal generating module work of standard control of vision signal formerly, and it is produced and the synchronous black field vision signal of vision signal formerly;
IV, after formerly vision signal is cut off, black video signal generating module input and vision signal formerly have black vision signal of go together mutually field duration and standard, show black field on monitor;
After V, the collection of video signal collective module are switched at the rear video row field signal, and the capable long period and the standard of this vision signal transferred to a black field video line field signal adjustment module;
VI, black video line field signal adjustment module are according to capable field duration and black video signal generating module work of standard control at the rear video signal, make it change the capable field duration and the standard of a black vision signal, make it and have identical capable field duration and standard at the rear video signal;
VII, replace and black synchronous vision signal of vision signal formerly, on monitor, show black with black vision signal in the rear video signal Synchronization;
VIII, stop output with black vision signal in the rear video signal Synchronization, input is at the rear video signal, and video switch is finished.
4. according to the changing method of right 3 described non-synchronous videos, it is characterized in that: be input to monitor at the rear video signal after capable field duration of vision signal formerly finishes, the uncompleted cycle replenishes with a black vision signal during switching.
5. according to the changing method of right 3 described non-synchronous videos, it is characterized in that: the capable synchronizing cycle of black vision signal and field sync period reach in that the rear video signal is corresponding with the vision signal formerly of correspondence and make adjusting.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103188531A (en) * | 2011-12-31 | 2013-07-03 | 北大方正集团有限公司 | Multi-source signal collection system and method |
| CN105307021A (en) * | 2015-10-26 | 2016-02-03 | 成都市极米科技有限公司 | Image display updating method and device |
| CN108449553A (en) * | 2018-03-23 | 2018-08-24 | 中国人民解放军92941部队 | Instructor in broadcasting's control system and signal processing method |
| CN112073651A (en) * | 2020-09-17 | 2020-12-11 | 中航华东光电有限公司 | Control method for preventing signal switching display abnormity |
| CN113126938A (en) * | 2020-01-15 | 2021-07-16 | 西安诺瓦星云科技股份有限公司 | Image display control method and device, display box and display system |
| CN114189710A (en) * | 2021-12-07 | 2022-03-15 | 中国电信股份有限公司 | Program guide processing method, program guide processing device, and storage medium |
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2011
- 2011-01-07 CN CN 201110002708 patent/CN102075723A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103188531A (en) * | 2011-12-31 | 2013-07-03 | 北大方正集团有限公司 | Multi-source signal collection system and method |
| CN103188531B (en) * | 2011-12-31 | 2015-11-11 | 北大方正集团有限公司 | A kind of multi-source signal collection system and method |
| CN105307021A (en) * | 2015-10-26 | 2016-02-03 | 成都市极米科技有限公司 | Image display updating method and device |
| CN105307021B (en) * | 2015-10-26 | 2018-07-24 | 成都市极米科技有限公司 | Image shows update method and device |
| CN108449553A (en) * | 2018-03-23 | 2018-08-24 | 中国人民解放军92941部队 | Instructor in broadcasting's control system and signal processing method |
| CN113126938A (en) * | 2020-01-15 | 2021-07-16 | 西安诺瓦星云科技股份有限公司 | Image display control method and device, display box and display system |
| CN113126938B (en) * | 2020-01-15 | 2024-06-04 | 西安诺瓦星云科技股份有限公司 | Image display control method and device, display box and display system |
| CN112073651A (en) * | 2020-09-17 | 2020-12-11 | 中航华东光电有限公司 | Control method for preventing signal switching display abnormity |
| CN114189710A (en) * | 2021-12-07 | 2022-03-15 | 中国电信股份有限公司 | Program guide processing method, program guide processing device, and storage medium |
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Application publication date: 20110525 |