CN101902660B - Method for testing video output signals of television - Google Patents
Method for testing video output signals of television Download PDFInfo
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- CN101902660B CN101902660B CN 201010253335 CN201010253335A CN101902660B CN 101902660 B CN101902660 B CN 101902660B CN 201010253335 CN201010253335 CN 201010253335 CN 201010253335 A CN201010253335 A CN 201010253335A CN 101902660 B CN101902660 B CN 101902660B
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Abstract
The invention discloses a method for testing video output signals of a television. The invention comprises a television to be tested, a video signal tester and a PC (personal computer) or other upper computers connected with the video signal tester via an RS232 bus, wherein the video signal tester comprises a video signal testing circuit, an accompanying sound shaping circuit connected with the video signal testing circuit, a 1.2KHZ audio signal generation circuit and a color-bar video signal generator; an AV1 video input terminal of the television to be tested is connected with the color-bar video signal generation circuit; and an AV1 audio input terminal thereof is connected with the 1.2KHZ audio signal generation circuit. The tests on the level parameter and time parameter of the video signal are immediately started after the video signal tester identifies the 1.2KHZ accompanying sound and then ensures that the current television to be tested is on the AV1 channel. Compared with the image testing method based on subjective judgment, the invention improves the testing efficiency and accelerates the testing progress.
Description
Technical field
The invention belongs to technical field of television sets, relate in particular to a kind of method of testing video output signals of television.
Background technology
In television set production testing link, test television set AV terminal video output signals generally adopts following method at present: the input terminal that this lead-out terminal is connected to another test special television machine, the instrumentation television machine switches to corresponding AV passage in advance, then whether the corresponding picture quality that shows of subjective judgement instrumentation television machine is qualified to determine television video output to be measured.Yet there is following drawback in the method for this subjective judgement: 1, often can not correctly judge whether standard of video output signals, for example whether amplitude of video output signal is slightly on the low side, is reflected on the image slightly partially dark.2, the method testing efficiency of subjective judgement is lower.So, rely on to observe image and pass judgment on whether qualified wayward good product quality of signal, and testing efficiency is lower.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of method of testing video output signals of television.
For achieving the above object, technical scheme of the present invention is:
A kind of method of testing video output signals of television, the PC or other host computers that include television set to be measured, Video Tester and be connected with Video Tester by the RS232 bus; Described Video Tester includes video letter signal test circuit, connects sound accompaniment shaping circuit and 1.2KHZ audio signal circuit for generating and the colour bar flying-spot video generator of test video signal circuit; The AV video output terminals sub-connection test video signal circuit of television set to be measured, AV audio output sub-connection sound accompaniment shaping circuit; And the AV1 video inputs sub-connection colour bar video signal generator circuit of television set to be measured, AV1 audio input end sub-connection 1.2KHZ audio signal circuit for generating.
Compared with prior art, after the method Video Tester of testing video output signals of television of the present invention recognizes the 1.2KHZ sound accompaniment, determine that current television set to be measured is in the AV1 passage, starts the level parameters of vision signal, the measurement of time parameter immediately.Compare with the method that the subjective judgement image is tested, both improved testing efficiency, also improved testing progress.
Description of drawings
Fig. 1 is theory diagram of the present invention.
Fig. 2 is the theory diagram of Video Tester of the present invention.
Fig. 3 is Video Tester level of the present invention, time parameter measuring circuit, reaches the circuit with upper machine communication.
Fig. 4 is circuit and the synchronizing separator circuit that vision signal of the present invention is converted to YUV signal.
Fig. 5 is color bar signal circuit for generating of the present invention and 1.2KHZ audio signal circuit for generating.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, 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, is not intended to limit the present invention.
With reference to shown in Figure 1, PC or other host computers that the method for testing video output signals of television of the present invention includes television set to be measured, Video Tester and is connected with Video Tester by the RS232 bus.Described Video Tester includes video letter signal test circuit, connects sound accompaniment shaping circuit and 1.2KHZ audio signal circuit for generating and the colour bar flying-spot video generator of test video signal circuit.Wherein, the AV video output terminals sub-connection test video signal circuit of television set to be measured, AV audio output sub-connection sound accompaniment shaping circuit; And the AV1 video inputs sub-connection colour bar video signal generator circuit of television set to be measured, AV1 audio input end sub-connection 1.2KHZ audio signal circuit for generating.
Then the present invention's creation switches to AV1 at level parameters and the time parameter of video output terminals test video signal by AV1 input standard color-bar signal.First vision signal is transferred to Y, U, V brightness, color difference components before the test level parameter, then a plurality of time points in a field signal carry out level measurement to Y, U, V signal.The test of time parameter comprises the time of delegation and one time test.Because the color bar signal that the test of video output is only inputted for AV1, therefore AV1 inputs the 1.2KHZ audio signal of (separating with the sound accompaniment frequency zones of other passage) simultaneously, such as Fig. 1 test principle block diagram, in a single day Video Tester detects television set AV audio frequency output 1.2KHZ signal, show that current video is output as the color bar signal of AV1 input, begin immediately to video output and carry out the test of level parameters and time parameter.Not color bar signal under other passage, will not measure.
Figure 2 shows that the theory diagram of Video Tester.Wherein, the colour bar flying-spot video generator produces the colour bar vision signal and exports television set to be measured to as vision signal, and the 1.2KHZ audio signal that 1.2KHZ audio signal circuit for generating produces exports television set to be measured to as audio signal.Synchronizing separator circuit is isolated field sync signal and composite synchronizing signal, and composite synchronizing signal comprises capable synchronizing information, and these two signals are as the time reference (synchronously rear 5us tests first level such as row) of test voltage parameter.Field sync signal also is used for the time of one of test, and composite synchronizing signal also is used for measuring the time of delegation.Y, U, V signal 3 select 1 circuit, and under the control of single-chip microcomputer, gating is tested Y, U, V level in turn.The sound accompaniment shaping circuit is transformed to square wave by sine wave, so that single-chip microcomputer test sound accompaniment frequency.TTL, RS232 level translator communicate to be used for single-chip microcomputer and PC.And PC is convenient to arrange, revise the parameter judgment criteria of test passes as host computer.
Fig. 3, Fig. 4, Figure 5 shows that the circuit theory diagrams of Video Tester.Wherein, CN4 is video output, and CN2 is audio output port, and CN5 is the video input mouth, and CN9 is audio input port, and CN1 is the port that communicates with PC.The red, green, blue of IC18 output colour bar pattern and row field sync signal are to IC10, and IC10 is video encoder, and red, green, blue, synchronizing signal are encoded into composite video signal, and 1C17 is pixel clock signal to clock signal 2 frequency divisions, is used for Video coding.IC33 is audio signal generator, and IC18 makes the sine wave of its output 1.2KHZ by 21,22,23 foot controls IC33 processed.IC32 carries out the amplification of audio signal.IC7 and peripheral circuit are synchronizing separator circuit, isolate field synchronization and composite synchronizing signal.The effect of IC14, IC15 and peripheral circuit is that vision signal is converted to Y, U, V brightness, color difference signal.IC8 and peripheral circuit are that Y, U, V three select 1 circuit, 21,22,23 foot controls gating processed by IC1, IC9 is double operational, an amplifier is used for the amplification of the signal behind the gating, and an amplifier is used for the shaping of audio signal, and making sine wave shaped is square wave, the signal of IC2 after to gating carries out analog-to-digital conversion, 16, the 17 foot control molding number conversions of IC1, the data of conversion are from 1 to the 8 pin input of IC1, and IC3 provides accurate reference level for analog to digital converter.Because the single-chip microcomputer transceiving data is Transistor-Transistor Logic level, PC RS232 mouth transceiving data is the RS232 level, therefore needs IC4 as TTL, RS232 level conversion, makes single-chip microcomputer and PC proper communication.
The present invention determines by test sound accompaniment output frequency whether the current passage of living in of tested television set is the target measurement passage, in order to trigger the method for automatic measurement vision signal; In addition, select the color bar signal test, the colour bar vision signal is converted to first Y, U, V component, then by the level of Single-chip Controlling, each 10 point of 3 components of test, this method of testing had both been tested sync level, had also tested each component level of each colour bar, tested more comprehensive, scientifical.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. the method for a testing video output signals of television includes television set to be measured, it is characterized in that, the PC or other host computers that also include Video Tester and be connected with Video Tester by the RS232 bus; Described Video Tester includes the test video signal circuit, connects sound accompaniment shaping circuit and 1.2KHZ audio signal circuit for generating and the colour bar video signal generator circuit of test video signal circuit; The AV video output terminals sub-connection test video signal circuit of television set to be measured, AV audio output sub-connection sound accompaniment shaping circuit; And the AV1 video inputs sub-connection colour bar video signal generator circuit of television set to be measured, AV1 audio input end sub-connection 1.2KHZ audio signal circuit for generating; By AV1 video input terminal input standard colour bar vision signal, then switch to the AV video output terminal at level parameters and the time parameter of video output terminals test video signal, the test of described time parameter comprises the time of delegation and one time test; In a single day Video Tester detects television set AV audio output output 1.2KHZ signal, show that current video is output as the colour bar vision signal of AV1 video input terminal input, begin immediately the vision signal of AV video output terminal output is carried out the test of level parameters and time parameter, rather than during the colour bar vision signal, will not measure.
2. the method for testing video output signals of television as claimed in claim 1, it is characterized in that: colour bar video signal generator circuit produces the colour bar vision signal and exports television set to be measured to as vision signal, and the 1.2KHZ audio signal that 1.2KHZ audio signal circuit for generating produces exports television set to be measured to as audio signal.
3. the method for testing video output signals of television as claimed in claim 2, it is characterized in that: synchronizing separator circuit is isolated field sync signal and composite synchronizing signal, composite synchronizing signal comprises capable synchronizing information, field sync signal and composite synchronizing signal are as the time reference of test level parameter, wherein, field sync signal also is used for the time of one of test, and composite synchronizing signal also is used for measuring the time of delegation.
4. the method for testing video output signals of television as claimed in claim 3, it is characterized in that: first vision signal is transferred to Y, U, V brightness, color difference components before the test level parameter, then a plurality of time points in a field signal carry out level measurement to Y, U, V signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010253335 CN101902660B (en) | 2010-08-13 | 2010-08-13 | Method for testing video output signals of television |
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| CN 201010253335 CN101902660B (en) | 2010-08-13 | 2010-08-13 | Method for testing video output signals of television |
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| CN101902660A CN101902660A (en) | 2010-12-01 |
| CN101902660B true CN101902660B (en) | 2013-01-23 |
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| CN 201010253335 Expired - Fee Related CN101902660B (en) | 2010-08-13 | 2010-08-13 | Method for testing video output signals of television |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102487451A (en) * | 2010-12-02 | 2012-06-06 | 深圳市同洲电子股份有限公司 | Voice frequency test method for digital television receiving terminal and system thereof |
| CN103167314A (en) * | 2011-12-09 | 2013-06-19 | 天津市亚安科技股份有限公司 | Device and method for testing stability of high definition digital video signals |
| CN103313089A (en) * | 2012-03-16 | 2013-09-18 | 三洋科技中心(深圳)有限公司 | Lip synchronization detection device and method |
| CN103856771A (en) * | 2012-12-03 | 2014-06-11 | 智易科技股份有限公司 | Image signal testing method and device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1645944A (en) * | 2004-12-13 | 2005-07-27 | 武汉大学 | Method for testing audio and video frequency step falling out of audio and video frequency coding-decoding system |
| CN101368992A (en) * | 2007-08-15 | 2009-02-18 | 鸿富锦精密工业（深圳）有限公司 | Test system and method of video signal generator |
| TW200910926A (en) * | 2007-08-24 | 2009-03-01 | Hon Hai Prec Ind Co Ltd | System and method for testing a video signal generator |
| CN101453664A (en) * | 2007-12-03 | 2009-06-10 | 鸿富锦精密工业（深圳）有限公司 | Video signal test system and method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3738018B2 (en) * | 2003-07-08 | 2006-01-25 | アイベックステクノロジー株式会社 | Signal delay measuring apparatus, signal delay measuring method, and signal delay measuring program |
| US20080239082A1 (en) * | 2007-03-29 | 2008-10-02 | Analogix Semiconductor, Inc. | HDMI format video pattern and audio frequencies generator for field test and built-in self test |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1645944A (en) * | 2004-12-13 | 2005-07-27 | 武汉大学 | Method for testing audio and video frequency step falling out of audio and video frequency coding-decoding system |
| CN101368992A (en) * | 2007-08-15 | 2009-02-18 | 鸿富锦精密工业（深圳）有限公司 | Test system and method of video signal generator |
| TW200910926A (en) * | 2007-08-24 | 2009-03-01 | Hon Hai Prec Ind Co Ltd | System and method for testing a video signal generator |
| CN101453664A (en) * | 2007-12-03 | 2009-06-10 | 鸿富锦精密工业（深圳）有限公司 | Video signal test system and method |
Non-Patent Citations (1)
| Title |
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| JP特开2005-33314A 2005.02.03 |
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Granted publication date: 20130123 Termination date: 20180813 |