CN102740016B - Detect the video-unit of video format - Google Patents
Detect the video-unit of video format Download PDFInfo
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- CN102740016B CN102740016B CN201110095003.4A CN201110095003A CN102740016B CN 102740016 B CN102740016 B CN 102740016B CN 201110095003 A CN201110095003 A CN 201110095003A CN 102740016 B CN102740016 B CN 102740016B
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Abstract
The video-unit of one detection video format is provided, the video reception port of this video-unit receives a vision signal, one reverser is connected between this video reception port and an A/D converter, the vision signal received by video reception port carries out reverse process, and the SYNC signal of the negative voltage in vision signal is converted to high level, the signal reverse through reverser is converted to digital signal by this A/D converter, this counter is connected between this A/D converter and microprocessor, detect the frequency that in this vision signal, high level occurs, then frequency corresponding with the vision signal of each form in a video formatted data storehouse for the frequency of detected high level appearance is contrasted, video format corresponding to the frequency close with the frequency that detected high level occurs is form corresponding to this vision signal.Use the present invention, carry out the detection of video signal format without the need to special video format checkout gear, thus reduce costs.
Description
Technical field
The present invention relates to a kind of video-unit detecting video format.
Background technology
Whether general video-unit can only detect has vision signal to input, but can not detect the form of institute's incoming video signal.But sometimes, as when testing, need the form first determining institute's incoming video signal, then according to the different-format of vision signal, the different parameters of video-unit is tested, although there is the device of special test video signal format in the market, all costly, cost is higher for the price of these devices.
Summary of the invention
In view of this, therefore need to provide a kind of video-unit detecting video format, carry out the detection of the form of vision signal by video-unit.
The video-unit of this detection video format comprises a video reception port, an A/D converter, a microprocessor and a memory, this video reception port is for receiving a vision signal, store a video formatted data storehouse in this memory, in this video formatted data storehouse, store the frequency of the correspondence of different-format vision signal, this video-unit also comprises a reverser and a counter, this reverser is connected between this video reception port and this A/D converter, vision signal for being received by video reception port carries out reverse process, and the SYNC signal of the negative voltage in vision signal is converted to high level, the signal reverse through reverser is converted to digital signal by this A/D converter, this counter is connected between this A/D converter and microprocessor, for detecting the frequency that in this vision signal, high level occurs, then frequency corresponding with the vision signal of each form in video formatted data storehouse for the frequency of detected high level appearance is contrasted, video format corresponding to the frequency close with the frequency that detected high level occurs is form corresponding to this vision signal.
Compared to prior art, the present invention by adding a reverser and a counter between the microprocessor and video input port of video-unit, after the vision signal of input is reverse, the frequency of high-frequency signal is calculated by counter, then according to the form of the frequency determination vision signal of high-frequency signal, so, the form of vision signal is detected by video-unit, and without the need to other video detecting device, thus reduce costs.
Accompanying drawing explanation
Fig. 1 is the structure chart that the present invention can carry out the video-unit of video format detection.
Fig. 2 is the present invention carries out detecting video-unit structure chart to the relevant parameter of video-unit.
Fig. 3 is the schematic diagram after the AC signal of a vision signal is filtered.
Fig. 4 is the schematic diagram after the direct current signal of a vision signal is filtered.
Main element symbol description
| Video-unit | 1 |
| Video reception port | 11 |
| Reverser | 12 |
| A/D converter | 13 |
| Counter | 14 |
| Microprocessor | 15 |
| Memory | 16 |
| Video formatted data storehouse | 161 |
| Video signal data storehouse | 162 |
| Multifunction apparatus | 20 |
| Luminance signal detection module | 40 |
| Exchange filter element | 401 |
| Level detecting unit | 403 |
| Carrier chrominance signal detection module | 30 |
| In-line filtration unit | 301 |
| Peak sensing unit | 303 |
Following embodiment will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Embodiment
As shown in Figure 1, for the present invention can carry out the structure chart of the video-unit of video format detection.This video-unit 10 comprises video reception port 11, reverser 12, A/D converter 13, counter 14 and a microprocessor 15.This reverser 12 is connected between this video reception port 11 and this A/D converter 13, and this counter 14 is connected between this A/D converter 13 and microprocessor 15.In present embodiment, this video-unit 10 can be TV.
This video reception port 11 is for receiving video signals, and the vision signal that video reception port 11 receives is changed through this reverser 12.Usual vision signal has the SYNC signal of a negative voltage within each cycle, other signal in cycle is positive voltage high level signal, therefore, this vision signal is after reverser 12, and within each signal period, the output of reverser 12 can once high level signal.This A/D converter 13 is for being converted to digital signal by the vision signal reverse through reverser.14, this counter exports the frequency of high level for adding up detected reverser 12.And the frequency transmission of added up high level is carried out the judgement of video format to microprocessor 15.
This video-unit 10 also comprises a memory 16, stores a video formatted data storehouse 161 in this memory 16, stores the criterion of identification of the correspondence of different video signal in this video formatted data storehouse 161.The video format of current main flow has NTSC and PAL, and according to the difference of picture update rate, the vision signal of NTSC form has 60Hz and 30Hz two kinds of frequencies.The vision signal of PAL form has 50Hz and 25Hz two kinds of frequencies.Then in the present embodiment, the criterion of identification of each video format recorded in this video formatted data storehouse 161 is the frequency of each vision signal.
So, the frequency of the high level that microprocessor 15 is added up according to counter 14 can determine the form of this vision signal, the frequency of high level that even counter 14 is added up is 60Hz or 30Hz, then microprocessor 15 can determine that the form of this vision signal is NTSC form, if the frequency of the high level that counter 14 is added up is 50Hz or 25Hz, then microprocessor 15 can determine that the form of this vision signal is PAL form.
In the present embodiment, also input a video standard signal to this video-unit 10 by video reception port 11, then the relevant parameter of this video standard signal after this video-unit 1 is detected, to determine the whether distortion of vision signal through this video-unit 1.In present embodiment, mainly the brightness of this vision signal and colourity are tested.
Testing in the relevant parameter process of this standard signal after this video-unit, need be detected by the signal format of this video-unit 1 to this video standard signal.According to detecting that the form of vision signal is tested the relevant parameter of this standard signal after this video-unit, to determine the whether distortion of vision signal through this video-unit 1.As shown in Figure 2, this video-unit also comprises Multifunction apparatus 20, colourity signal detection module 30 and a luminance signal detection module 40.Also store multiple video signal data storehouse 162 in this memory 16, the corresponding video signal data storehouse 162 of vision signal of often kind of form, stores examination criteria and the standard value of each parameter of this format video signal in this each video signal data storehouse 162.As namely stored chromatic value corresponding to voltage peaks different in brightness value corresponding to varying level in the direct current signal of the vision signal of PAL form and AC signal in the video signal data storehouse of PAL form.In the present embodiment, the standard value of this format video signal comprises normal brightness value and reference colour angle value.
The signal that this video standard signal is divided into two-way identical after Multifunction apparatus 20.The brightness that first via signal carries out this vision signal through this luminance signal detection module 40 detects, and the second road signal carries out the colorimetric detection of this vision signal through this carrier chrominance signal detection module 30.
This brightness detection module 40 comprises interchange filter element 401 and a level detecting unit 403, this interchange filter element 401 is for filtering out the AC signal in this video standard signal, filter out the vision signal of AC signal as shown in Figure 3, for having stair-stepping direct current ripple, this level detecting unit 403 detects each level value of this direct current ripple, and measured level value is transferred to microprocessor 15.Level value in video signal data storehouse 162 corresponding with the vision signal of this form for detected level value compares by this microprocessor 15, to determine the brightness value that each level value is corresponding, then determined brightness value is compared with the normal brightness value of this format video signal, thus determine whether the brightness of this vision signal vision signal after this video-unit 1 can distortion.
This colorimetric detection module 30 comprises in-line filtration unit 301 and a peak sensing unit 303, this in-line filtration unit 301 is for filtering out the direct current signal in this video standard signal, the vision signal filtering out direct current signal as shown in Figure 4, for having the combination of the signal of different voltage peak.This peak sensing unit 403 detects each voltage peak of this AC signal, and measured voltage peak is transferred to microprocessor 15.Voltage peak in video signal data storehouse 162 corresponding with this format signal for detected voltage peak compares by this microprocessor 15, to determine the chromatic value that each voltage peak is corresponding, then determined chromatic value is compared with the reference colour angle value of this format video signal, thus determine whether the colourity of this vision signal vision signal after this video-unit 1 can distortion.
Claims (3)
1. one kind is detected the video-unit of video format, described video-unit comprises a video reception port, an A/D converter, a microprocessor and a memory, described video reception port is for receiving a vision signal, a video formatted data storehouse is stored in described memory, frequency video signal corresponding to different-format vision signal is stored in described video formatted data storehouse, described frequency video signal, for identifying the form of vision signal, is characterized in that: described video-unit also comprises
One reverser, described reverser is connected between described video reception port and described A/D converter, described vision signal for being received by described video reception port carries out reverse process, and the negative voltage SYNC signal in described vision signal is converted to high level, the described vision signal through described reverser reverse process is converted to digital signal by described A/D converter;
One counter, described counter is connected between described A/D converter and described microprocessor, for adding up the frequency that in detected described vision signal, high level occurs;
Described microprocessor also contrasts for the described frequency video signal in the frequency that occurred by the high level of described counters count and described video formatted data storehouse, the frequency occurred when the high level of described counters count is 60Hz or 30Hz, then determine that the form of described vision signal is NTSC form, the frequency occurred when the high level of described counters count is 50Hz or 25Hz, then determine that the form of described vision signal is NTSC form.
2. the video-unit detecting video format as claimed in claim 1, it is characterized in that, what described video reception port received is a video standard signal, multiple video signal data storehouse is also stored in described memory, the corresponding video signal data storehouse of vision signal of often kind of form, the normal brightness value of brightness value corresponding to varying level in the direct current signal of the vision signal of described often kind of form and described often kind of format video signal is stored in each video signal data storehouse, described video-unit also comprises a luminance signal detection module, the brightness value after video format is detected through described video-unit for detecting described video standard signal, described luminance signal detection module comprises an interchange filter element and a level detecting unit, described interchange filter element obtains a vision signal for the AC signal filtered out in described video standard signal, described vision signal is for having stair-stepping direct current ripple, described level detecting unit detects each level value of described direct current ripple, and described each level value transfers to described microprocessor, the video signal data storehouse that the form of described video standard signal is corresponding determined by described microprocessor, level value in video signal data storehouse corresponding with the form of described video standard signal for described each level value is compared, to determine the brightness value that described each level value is corresponding, the described brightness value determined is compared with the normal brightness value of described video standard signal, if determined brightness value is consistent with the normal brightness value of described video standard signal, then illustrate that the brightness of described video standard signal can not produce distortion through described video-unit, if the normal brightness of determined brightness value and described video standard signal is worth inconsistent, then illustrate that the brightness of described video standard signal produces distortion through described video-unit.
3. the video-unit detecting video format as claimed in claim 1, what described video reception port received is a video standard signal, multiple video signal data storehouse is also stored in described memory, often kind of corresponding video signal data storehouse of format video signal, the reference colour angle value of the vision signal of brightness value corresponding to different peak values in the AC signal of the vision signal of described often kind of form and described often kind of form is stored in each video signal data storehouse, it is characterized in that, described video-unit also comprises a colourity signal detection module, the chromatic value after video format is detected through described video-unit for detecting described video standard signal, described carrier chrominance signal detection module comprises an in-line filtration unit and a peak sensing unit, described in-line filtration unit obtains the AC signal of described video standard signal for the direct current signal filtered out in described video standard signal, described peak sensing unit detects each voltage peak of the AC signal of described video standard signal, and measured voltage peak is transferred to microprocessor, the video signal data storehouse that the video format of described video standard signal is corresponding determined by described microprocessor, voltage peak in video signal data storehouse corresponding with the form of described video standard signal for described each voltage peak is compared, to determine the chromatic value that described each voltage peak is corresponding, determined chromatic value is compared with the reference colour angle value of described video standard signal, if determined chromatic value is consistent with the reference colour angle value of described video standard signal, then illustrate that the colourity of described video standard signal can not produce distortion through described video-unit, if the reference colour angle value of determined chromatic value and described video standard signal is inconsistent, then illustrate that the colourity of described video standard signal produces distortion through described video-unit.
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| CN1953518A (en) * | 2005-10-21 | 2007-04-25 | 芯微技术（深圳）有限公司 | PC-based TV receiving method and installation, video demodulator and decoding method |
| CN200973141Y (en) * | 2006-11-25 | 2007-11-07 | 浙江工贸职业技术学院 | Vedio decoder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1953518A (en) * | 2005-10-21 | 2007-04-25 | 芯微技术（深圳）有限公司 | PC-based TV receiving method and installation, video demodulator and decoding method |
| CN200973141Y (en) * | 2006-11-25 | 2007-11-07 | 浙江工贸职业技术学院 | Vedio decoder |
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Effective date of registration: 20180226 Address after: Shanghai City, Songjiang Export Processing Zone South Road No. 1925 Patentee after: Ambit Microsystems (Shanghai) Co., Ltd. Address before: 201613 Shanghai City, Songjiang District Songjiang Export Processing Zone South Road No. 1925 Co-patentee before: Hon Hai Precision Industry Co., Ltd. Patentee before: Ambit Microsystems (Shanghai) Co., Ltd. |