CN104079923A - Self-inspection method and self-inspection system of main board internally-hidden tuner - Google Patents
Self-inspection method and self-inspection system of main board internally-hidden tuner Download PDFInfo
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- CN104079923A CN104079923A CN201310535606.0A CN201310535606A CN104079923A CN 104079923 A CN104079923 A CN 104079923A CN 201310535606 A CN201310535606 A CN 201310535606A CN 104079923 A CN104079923 A CN 104079923A
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Abstract
The invention discloses a self-inspection method and a self-inspection system of a main board internally-hidden tuner and provides a self-inspection method and system of the main board internally-hidden tuner and used for facilitating improvement of the production efficiency and detection accuracy. The self-inspection method comprises the steps of outputting radio frequency signals at preset frequencies; converting the radio frequency signals into intermediate frequency signal; decoding the intermediate frequency signals into composite videocast signals; decoding the composite videocast signals and reading working parameter data of the turner from the composite videocast signals; comparing the working parameter data of the turner with a preset parameter range, judging that the turner works normally if the parameter data of the turner are in the preset parameter range; judging that the turner does not work normally if the parameter data of the turner are not in the preset parameter range. A process is simple, inspection of single turner items of a production line is facilitated, and the production efficiency is improved. Due to the fact that man-made participation is not needed, the influence of human factors to detection results is eliminated, the detection accuracy is high, and guarantee of the product quality is facilitated.
Description
Technical field
The present invention relates to technical field of television sets, particularly relate to a kind of self checking method and self-checking system of mainboard built-in tuner.
Background technology
Tuner is the vitals of television set.Along with scientific and technological progress, tuner and video reception mainboard are made built-in.For products quality guarantee, need to before dispatch from the factory, whether tuner normally be worked and be detected.
At present, mainboard built-in tuner list product are used tuner self-checking unit to carry out when detecting.This checkout gear is that the radio-frequency (RF) signal input end of tuner is connected with the output of TV RF signals generator, the intermediate-freuqncy signal output of tuner is connected with CPU, CPU is by CVBS(composite video broadcast singal again) output circuit and oscilloscope connect to form.During detection, the radiofrequency signal of exporting fixed frequency by television signal generator is to tuner, tuner changes into intermediate-freuqncy signal by the radiofrequency signal of fixed frequency, CPU converts intermediate-freuqncy signal to CVBS(composite video broadcast singal), by CVBS output circuit, export to oscilloscope, by oscilloscope, show composite video broadcast singal waveform, by the value of projects such as genlocing/color sub-carrier/video amplitude/noise states that oscilloscope is tested out, judge whether tuner list product can normally work.
Mainly there is following problems in current detection method:
During 1, due to each detection, all need to carry out the connection of hardware, complex technical process, has had a strong impact on the production efficiency of production line.Meanwhile, the connection of each hardware all exerts an influence to the accuracy detecting.
2, owing to adopting oscilloscope to need artificially with the naked eye to check, having artifical influence factor, there is larger problem in the accuracy of composite video broadcast singal.
3. because needs append the corresponding oscilloscope inspection of CVBS output circuit, increased production cost.
Summary of the invention
The object of the invention is for the technological deficiency existing in prior art, and provide a kind of, be conducive to enhance productivity and the self checking method of the mainboard built-in tuner of detection accuracy.
Another object of the present invention is to provide and is a kind ofly conducive to enhance productivity and the self-checking system of the mainboard built-in tuner of detection accuracy.
For realizing the technical scheme that object of the present invention adopts, be:
A self checking method for mainboard built-in tuner, comprises the steps:
Step 11, the radiofrequency signal of output predeterminated frequency;
Step 12, converts described radiofrequency signal to intermediate-freuqncy signal;
Step 13, is decoded into composite video broadcast singal by described intermediate-freuqncy signal;
Step 14, decodes to described composite video broadcast singal, and therefrom reads tuner running parameter data;
Step 15, compares described tuner running parameter data and parameter preset scope, if described tuner parameters data are within the scope of described parameter preset, enters step 16; If described tuner parameters data, not within the scope of described parameter preset, enter step 17;
Step 16, judges that this tuner normally works;
Step 17, judges that this tuner normally do not work.
After described step 11, before step 12, also comprise:
Step 111, searches for described radiofrequency signal by preset times, if lock channel predeterminedly, enters step 12; If fail, lock channel predeterminedly, enter step 17.
Wherein, described tuner running parameter data comprise one or more in tuner locking parameter, tuner power supply level parameter, composite video broadcast singal lock-out state parameter, the Gain Automatic calibration parameter of intermediate-freuqncy signal, composite video broadcast singal color sub-carrier frequency parameter, composite video broadcast singal peak value level parameter, composite video broadcast singal noise level parameter; When comprising a plurality of running parameter, all tuner running parameter data all just perform step 16 in default scope, if having any tuner running parameter data not in preset range, perform step 17.
Also comprise step 18, export the judged result of described step 16 or described step 17.
A self-checking system for mainboard built-in tuner, comprising:
Television signal generator, for exporting the radiofrequency signal of predeterminated frequency;
Tuner, converts described radiofrequency signal to intermediate-freuqncy signal;
Controller, this controller comprises intermediate-freuqncy signal decoder module, register, composite video broadcast singal decoder module, tuner judge module;
Described intermediate-freuqncy signal decoder module, for being decoded into composite video broadcast singal by described intermediate-freuqncy signal;
Described register, for storing parameter preset scope;
Composite video broadcast singal decoder module, for described composite video broadcast singal is decoded, and therefrom reads tuner running parameter data;
Tuner judge module, for described tuner running parameter data and parameter preset scope are compared, normally works if described tuner parameters data within the scope of described parameter preset, judge this tuner; If described tuner parameters data not within the scope of described parameter preset, are judged this tuner and are not normally worked.
Described controller also comprises judged result output module, and described judged result output module, for exporting the judged result of described tuner judge module.
Described judged result output module is connected with external display device by asynchronous receiving-transmitting interface.
Described display device is one or more in display, display lamp or alarm.
Compared with prior art, the invention has the beneficial effects as follows:
1, self checking method of the present invention is by being first decoded into intermediate-freuqncy signal composite video broadcast singal, again described composite video broadcast singal is decoded and also therefrom read the running parameter of tuner, this running parameter and preset value are compared, thereby realize the self check of tuner, flow process is simple, be convenient to the inspection of production line tuner list product, improved production efficiency.
2, self checking method of the present invention is that internal system is carried out self check, owing to not needing artificial participation, has got rid of the impact of human factor on testing result, and the accuracy of detection is high, is conducive to products quality guarantee.
3, in self checking method of the present invention, do not need independent CVBS output circuit, reduced production cost.
4, self-checking system of the present invention realizes the self check of internal system tuner by controller, and self-detection result reliability is high.
Accompanying drawing explanation
Figure 1 shows that the flow chart of the self checking method of mainboard built-in tuner of the present invention;
Figure 2 shows that the schematic diagram of the self-checking system of mainboard built-in tuner of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
The flow chart of the self checking method of mainboard built-in tuner of the present invention as shown in Figure 1, comprises the steps:
Step 11, the radiofrequency signal of output predeterminated frequency;
Step 12, converts described radiofrequency signal to intermediate-freuqncy signal;
Step 13, is decoded into composite video broadcast singal by described intermediate-freuqncy signal;
Step 14, decodes to described composite video broadcast singal, and therefrom reads tuner running parameter data; Wherein, described tuner running parameter data comprise one or more in tuner locking parameter, tuner power supply level parameter, composite video broadcast singal lock-out state parameter, the Gain Automatic calibration parameter of intermediate-freuqncy signal, composite video broadcast singal color sub-carrier frequency parameter, composite video broadcast singal peak value level parameter, composite video broadcast singal noise level parameter.
Step 15, compares described tuner running parameter data and parameter preset scope, if described tuner parameters data are within the scope of described parameter preset, enters step 16, and described step 16 is normally worked for judging this tuner; If described tuner parameters data, not within the scope of described parameter preset, enter step 17; Described step 17 is not normally worked for judging this tuner.When comprising a plurality of running parameter data, all tuner running parameter data all just perform step 16 in default scope, if having any tuner running parameter data not in preset range, perform step 17.
For radiofrequency signal is had or not to inspection, between described step 11 and step 12, also comprise:
Step 111, searches for described radiofrequency signal by preset times, if lock channel predeterminedly, enters step 12; If fail, lock channel predeterminedly, enter step 17.
For the ease of quality personnel, whether tuner is normally worked and judged, need to export the judged result of described step 16 or described step 17.
The self checking method of mainboard built-in tuner of the present invention can adopt following self-checking system to realize.The schematic diagram of this self-checking system as shown in Figure 2, comprising:
Television signal generator, for exporting the radiofrequency signal of predeterminated frequency;
Tuner, converts described radiofrequency signal to intermediate-freuqncy signal;
Controller, this controller comprises intermediate-freuqncy signal decoder module, register, composite video broadcast singal decoder module, tuner judge module;
Described intermediate-freuqncy signal decoder module, for being decoded into composite video broadcast singal by described intermediate-freuqncy signal;
Described register, for storing parameter preset scope;
Composite video broadcast singal decoder module, for described composite video broadcast singal is decoded, and therefrom reads tuner running parameter data;
Tuner judge module, for described tuner running parameter data and parameter preset scope are compared, normally works if described tuner parameters data within the scope of described parameter preset, judge this tuner; If described tuner parameters data not within the scope of described parameter preset, are judged this tuner and are not normally worked.
When needs are exported judged result, described controller also comprises judged result output module, and described judged result output module is for exporting the judged result of described tuner judge module.In the present invention, the way of output of judged result can be various ways, preferably adopts the display mode of external display device, that is: described judged result output module is connected with external display device by asynchronous receiving-transmitting interface.Wherein, described display device is one or more in display, display lamp or alarm.The different colours that can adopt and test display demonstration judged result, pass through indicator light shows judged result, by audible-visual annunciator, shows judged result, or sends judged result information by language alarm.
Embodiment 1
In the present embodiment, testing result shows with test display.
(1) tuner parameter preset scope is left in register.
(2) radiofrequency signal channel tuning: television signal generator is exported the radiofrequency signal (FullWhite Pattern/70dBuV/RF Frequency:471.25MHz) of a fixed frequency and delivered in tuner, and tuner enters radiofrequency signal channel search shape according to channel frequency table.
(3) tuner locking checks: by preset times, search for described radiofrequency signal, if lock channel predeterminedly, tuner converts described radiofrequency signal to intermediate-freuqncy signal; If fail, lock channel predeterminedly, judge that this tuner normally do not work, by test display, show the normal job information of tuner.
(4) intermediate-freuqncy signal that the intermediate-freuqncy signal decoder module receiver turning in controller converts to, and be decoded into composite video broadcast singal.
(5) composite video broadcast signal decoder is decoded above-mentioned composite video broadcast singal again, and therefrom reads tuner running parameter data.
(6) tuner judge module compares parameter default in the running parameter data that read and register, specifically relatively comprises:
1. tuner power supply level checks: if the value reading is compared with judgment standard data default in register, when lower than reference data, by test display, show failure information.During higher than reference data, for passing through to detect.Detect the numerical value in a plurality of cycles, repeatedly, all by detecting, in test display, show and pass through detecting information.
-equipment output level: 70dBuV (37dBm)
-the value that reads-more than 50dBm by detecting, numerical value little (50dBm is following) is by detecting.
Measured value: 1.VHF L:-44.5dBm
2.VHF?H:-42dBm
3.UHF:-43dBm
2. the Gain Automatic calibration parameter inspection of intermediate-freuqncy signal:
The Gain Automatic calibration parameter of intermediate-freuqncy signal itself has specification value.The genlocing state of 70dBuV has a specification value 0x73, and the value of defining is set to 0x72.
When value >=0x72 that tuner judge module reads, represent the Gain Automatic calibration parameter passed examination of intermediate-freuqncy signal, when read value <0x72 time represent that the Gain Automatic calibration parameter of intermediate-freuqncy signal checks defective.
3. composite video broadcast singal lock-out state checks:
By to vision signal row, whether synchronous locking judges, if locking, and continuous several times would be all qualified, carries out the judgement of next running parameter.Otherwise the inspection of judgement lock composite video broadcast singal lock-out state is not passed through.
4. composite video broadcast singal color sub-carrier frequency checks:
The Gain Automatic calibration parameter check process of step intermediate-freuqncy signal 2. in like manner.
CVBS color sub-carrier frequency itself has specification value CE-CF, comparison value is set to 0xC0 (more than 243mV), reading corresponding value and specification value compares, when read value >=0xC0 time represent CVBS color sub-carrier frequency passed examination, when read value <0xC0 time to represent that CVBS color sub-carrier frequency checks defective.
5. composite video broadcast singal peak value level checks:
Composite video broadcast singal peak value level is divided into Peak level and Bottom level.Wherein Bottom level specification is 2C-2F, and comparison value is set as to 0x32 (63.5mV is following).
Wherein Peak level specification is 026F-0273, specification limit 01FF≤Read Value≤02FF (649mV-950mV).
The Peak of composite video broadcast singal and Bottom instantaneous value, 01FF≤Peak Read Value≤02FF shows that Peak level is qualified, Bottom Read Value<0x32 shows that Bottom level is qualified.Above Peak and Bottom level all qualified situation explanation CVBS signal peak level are qualified.Peak and Bottom level have one defective, be defective.
6. composite video broadcast singal noise level checks:
CVBS noise level benchmark is 04, and comparison value is set as to 0A., read the instantaneous value of CVBS noise level, when read value≤0A time show that CVBS noise level is qualified.
Above status checkout all by time, judge that tuner normally works, and by judged result output module, export to test display and show.If wherein any one is defective, judges that tuner normally do not work, and show by export to test display by judged result output module.
Self checking method of the present invention is by being first decoded into intermediate-freuqncy signal composite video broadcast singal, again described composite video broadcast singal is decoded and also therefrom read the running parameter of tuner, this running parameter and preset value are compared, thereby realize the self check of tuner, flow process is simple, be convenient to the inspection of production line tuner list product, improved production efficiency.Owing to not needing artificial participation, got rid of the impact of human factor on testing result, the accuracy of detection is high, is conducive to products quality guarantee.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. a self checking method for mainboard built-in tuner, is characterized in that, comprises the steps:
Step 11, the radiofrequency signal of output predeterminated frequency;
Step 12, converts described radiofrequency signal to intermediate-freuqncy signal;
Step 13, is decoded into composite video broadcast singal by described intermediate-freuqncy signal;
Step 14, decodes to described composite video broadcast singal, and therefrom reads tuner running parameter data;
Step 15, compares described tuner running parameter data and parameter preset scope, if described tuner parameters data are within the scope of described parameter preset, enters step 16; If described tuner parameters data, not within the scope of described parameter preset, enter step 17;
Step 16, judges that this tuner normally works;
Step 17, judges that this tuner normally do not work.
2. the self checking method of mainboard built-in tuner according to claim 1, is characterized in that, after described step 11, before step 12, also comprises:
Step 111, searches for described radiofrequency signal by preset times, if lock channel predeterminedly, enters step 12; If fail, lock channel predeterminedly, enter step 17.
3. the self checking method of mainboard built-in tuner according to claim 1, it is characterized in that, described tuner running parameter data comprise one or more in tuner locking parameter, tuner power supply level parameter, composite video broadcast singal lock-out state parameter, the Gain Automatic calibration parameter of intermediate-freuqncy signal, composite video broadcast singal color sub-carrier frequency parameter, composite video broadcast singal peak value level parameter, composite video broadcast singal noise level parameter; When comprising a plurality of running parameter, all tuner running parameter data all just perform step 16 in default scope, if having any tuner running parameter data not in preset range, perform step 17.
4. the self checking method of mainboard built-in tuner according to claim 1, is characterized in that, also comprise,
Step 18, exports the judged result of described step 16 or described step 17.
5. a self-checking system for mainboard built-in tuner, is characterized in that, comprising:
Television signal generator, for exporting the radiofrequency signal of predeterminated frequency;
Tuner, converts described radiofrequency signal to intermediate-freuqncy signal;
Controller, this controller comprises intermediate-freuqncy signal decoder module, register, composite video broadcast singal decoder module, tuner judge module;
Described intermediate-freuqncy signal decoder module, for being decoded into composite video broadcast singal by described intermediate-freuqncy signal;
Described register, for storing parameter preset scope;
Composite video broadcast singal decoder module, for described composite video broadcast singal is decoded, and therefrom reads tuner running parameter data;
Tuner judge module, for described tuner running parameter data and parameter preset scope are compared, normally works if described tuner parameters data within the scope of described parameter preset, judge this tuner; If described tuner parameters data not within the scope of described parameter preset, are judged this tuner and are not normally worked.
6. the self-checking system of mainboard built-in tuner according to claim 5, is characterized in that, described controller also comprises judged result output module, and described judged result output module, for exporting the judged result of described tuner judge module.
7. the self-checking system of mainboard built-in tuner according to claim 6, is characterized in that, described judged result output module is connected with external display device by asynchronous receiving-transmitting interface.
8. the self-checking system of mainboard built-in tuner according to claim 7, is characterized in that, described display device is one or more in display, display lamp or alarm.
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