CN102625135A - Automatic test system for network access of set-top box - Google Patents
Automatic test system for network access of set-top box Download PDFInfo
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- CN102625135A CN102625135A CN2012100184468A CN201210018446A CN102625135A CN 102625135 A CN102625135 A CN 102625135A CN 2012100184468 A CN2012100184468 A CN 2012100184468A CN 201210018446 A CN201210018446 A CN 201210018446A CN 102625135 A CN102625135 A CN 102625135A
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Abstract
An embodiment of the invention discloses an automatic test system for network access of a set-top box, which comprises a digital television test signal generator, a digital television test transmitter, the set-top box, an audio analyzer, a video analyzer and a controller. The digital television test signal generator, the digital television test transmitter and the set-top box are respectively electrically connected with the controller, the controller is connected with the audio analyzer and the video analyzer via a USB (universal serial bus) and then a GPIB (general purpose interface bus). The digital television test signal generator is used for generating standard test signals, the digital television test transmitter is used for modulating the test signals into digital signals, the modulated digital signals serving as the test input signals are used for testing the set=top box, and the processed test signals are respectively transmitted to the corresponding video analyzer and the audio analyzer by the set=top box and then are analyzed and displayed. By the aid of the automatic test system for network access of the set-top box, parameters of the audio and the video can be tested automatically, human labor, time and hardware resources can be saved due to the fact that the system is operated by machine, and the testing efficiency can be improved.
Description
Technical field
The present invention relates to the digital television techniques field, relate in particular to a kind of STB networking Auto-Test System.
Background technology
The DTV set-top box is one of information household appliances, and CATV set-top-box refers to that specially signal can be from the DTV STB of wire cable.The basic function of CATV set-top-box is the receiving digital television broadcast program, has all broadcasting and interactive multimedia application functions simultaneously.The main key technology of CATV set-top-box comprises: the modulating-coding of channel-decoding, source coding, upstream data, embedded type CPU, MPEG-2 decompression, set-top box software, demonstration control and scrambling-descrambling technology etc.
At present, the regulation of industry technology standard GD/J12-2007 " (STB) specification requirement of cable digital TV system user Rcv decoder and method of measurement " is deferred in the network access testing of cable TV set-top box.This standard comprises mainly that for the requirement of STB functional requirement and performance index require two parts.Because the many-side that functional requirement and performance index require, what require simultaneously is various, and causing present most of test laboratory all is to adopt manpower to detect.Traditional manpower detects and exists apparent in view shortcoming, and promptly efficient is low, resources such as waste of manpower, hardware, and cost is high, and test process also possibly make a mistake because of human factor.Therefore, be necessary to propose later on total STB networking Auto-Test System and solve above-mentioned defective.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, the invention provides a kind of STB networking Auto-Test System, can realize CATV set-top-box is tested automatically, save manpower, time and hardware resource, improve testing efficiency.
In order to address the above problem; The present invention proposes a kind of STB networking Auto-Test System; Comprise: digital TV test signal generator, DTV test receiver, STB, audio analysis device, video analyzer and controller; Said digital TV test signal generator, DTV test receiver and STB are electrically connected with said controller respectively; Said controller changes GPIB (General-Purpose Interface Bus through USB; General-purpose interface bus) bus connects said audio analysis device and video analyzer, and said digital TV test signal generator is used to the test signal of the standard that produces, and said DTV test receiver is used for said test signal is modulated into digital signal; Digital signal after the modulation is tested STB as Test input signal, and the test signal after STB will be handled is delivered to corresponding video analyzer respectively, the audio analysis device is analyzed and show.
Preferably; Said controller comprises that control test module, standard are provided with module, beginning test module, initialization instrument module, video measurement module and audio-frequency test module; Be provided with in the said standard device module and comprise all STB standard database, said standard is provided with the setting that module is used to accomplish the STB standard; Said beginning test module is used to set up the form of storage data, and in form, adds data storage location information; Said initialization instrument module is used to accomplish the initialization of video analyzer and audio analysis device; The video index that said video index test module is tested comprises that video output amplitude, audio video synchronization amplitude, video look bright gain inequality, video look bright delay inequality, video K system, video are non-linear, the video differential phase, the video differential gain, video signal to noise ratio, video amplitude-frequency characteristic; The test index of said audio-frequency test module comprises audio frequency output amplitude, audio frequency amplitude-frequency characteristic, audio frequency signal to noise ratio, total harmonic distortion, audio left R channel level difference and audio frequency interchannel crosstalk; Said control test module is used to control the operation of each module and the signal of transmission/receiving digital television measuring signal generator, DTV test receiver and STB, accomplishes the test of each item test index.
Preferably, said controller is a computer.
The STB networking Auto-Test System of embodiment of the present invention embodiment; Can realize the looking of CATV set-top-box, audio-frequency index parameter are tested automatically and assessed; Being converted into machine to the behavioral test with artificial driving carries out; Save manpower, time and hardware resource greatly, improved testing efficiency.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structured flowchart of the STB networking Auto-Test System of the embodiment of the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Based on the demand and the radio, TV and film industries relevant regulations of system operator, CATV set-top-box must pass through series of tests.The present invention is directed to CATV set-top-box network access testing demand, content measurement, test environment and the method for testing of CATV set-top-box studied. and to look, audio-frequency index test proposed a kind of STB automatic testing scheme that networks.
With reference to figure 1; Particularly; The invention provides a kind of STB networking Auto-Test System; Comprise: digital TV test signal generator, DTV test receiver, STB, audio analysis device, video analyzer and controller, said digital TV test signal generator, DTV test receiver and STB are electrically connected with said controller respectively, and said controller changes gpib bus through USB and connects said audio analysis device and video analyzer; Preferably, said controller is a computer.Said digital TV test signal generator is used to the test signal of the standard that produces; Said DTV test receiver is used for said test signal is modulated into digital signal; Digital signal after the modulation is tested STB as Test input signal, and the test signal after STB will be handled is delivered to corresponding video analyzer respectively, the audio analysis device is analyzed and show.The gpib interface bus gains universal acceptance owing to its high conversion rate (can reach 1Mbytes/s usually); Through GPIB control can realize with one or more instrument listen, say, control function; And the composition instrument system, make test and surveying work become quick, easy, accurate and efficient.
In an embodiment of the present invention; Said digital TV test signal generator is preferably R&S DVSG (digital video signal source); It and general Platform Implementation to the generation of compression and non-compression video/audio signal and playing function again; It not only provides the TS coffret, and nearly all general audio/video (high definition/SD) interface also is provided, and is used for the test of television indicator.The DVSG main feature is: the universal audio of compatible each class standard and video interface, abundant library, support subscriber signal import, simulate actual application environment, support all kinds of video formats, reach as high as 1080P.
The preferred R&S SFQ of said DTV test receiver (video measurement transmitter), it is used to test, and DTV connects and receive, can be used for DVB-T, DVB-S/DVB-DSNG, turbo sign indicating number, DVB-C, J.83B with standard signal test such as ATSC/8VSB.
Said video analyzer is preferably VSA (video measuring system), VSA with the function combinations of video analyzer, vectorscope, oscilloscope, monitor and controller (PC) in an equipment.VSA video measuring system main feature is: 4 road ring intervisibility signal inputs frequently, 9MHz analog bandwidth; The compatible PC of DOS and Windows has the IEC/IEEE bus control unit; Operating system with multitasking ability; External keyboard and color monitor interface; Monochrome graphics LCD display (640X480 pixel) or color LCD; The dual serial interface; Carry out the SCPI Long-distance Control through IEC/IEEE or serial line interface; Printer interface; 3.5 floppy drive (dos format) is used for transfer of data and software option; Built-in hard disk; Modularized design has hardware and software option etc.
Said audio analysis device preferentially adopts UPL (audio analyzer), and its main feature is to use simulation, numeral and combined interface, and real binary channels is measured; Great dynamic range; Can carry out fft analysis, jitter analysis, carry out interface testing, the filter freely programmable; By the integrated computer of small units, can generate automatic cycle tests.
Preferably; Said controller comprises that control test module, standard are provided with module, beginning test module, initialization instrument module, video measurement module and audio-frequency test module; Be provided with in the said standard device module and comprise all STB standard database, said standard is provided with the setting that module is used to accomplish the STB standard; Said beginning test module is used to set up the form of storage data, and in form, adds data storage location information; Said initialization instrument module is used to accomplish the initialization of video analyzer and audio analysis device.Said control test module is used to control the operation of each module and the signal of transmission/receiving digital television measuring signal generator, DTV test receiver and STB, accomplishes the test of each item test index.
The flow process of said control test module control whole procedure, whole procedure adopts the state machine pattern, and a state connects a state ground and accomplishes test.Whole procedure is divided into control, test, standard totally 15 states is set etc.Program controling module can be selected any state working procedure.The state machine pattern is made up of loop structure and construction of condition.
Said standard is provided with the setting that module is accomplished the STB standard, and it deposits all standards in database. and can upgrade the standard in the database.Procedure subject adopts sequential organization, and sequential organization has 18 layers. accomplish the standard setting of 16 indexs.
Said beginning test module is accomplished and is set up the used form of storage data in the database; And in form, add data storage location information; This module has been set up four forms under the data designated storehouse, be used for stored video data, voice data, video amplitude-frequency characteristic waveform, audio frequency amplitude-frequency characteristic waveform respectively.
Said initialization instrument module is accomplished the initial work of VSA, UPL, makes instrument before test, be in a rational operating state.The VSA initialization comprises the initialization of four test lines, i.e. TQEietline, T17Ccir, TSINx_x, T330ccir, and the initialize routine of four test lines is similar.The initialization of UPL comprises the initialization of scanning frequency, the initialization of display interface.
The video index that said video index test module is tested comprises that video output amplitude, audio video synchronization amplitude, video look bright gain inequality, video look bright delay inequality, video K system, video are non-linear, the video differential phase, the video differential gain, video signal to noise ratio, video amplitude-frequency characteristic.
Automatically during the test video output amplitude, the video output amplitude is the peak-to-peak value of video output level.Test signal is the capable measuring-signal of CCIR17.According to the set top box testing standard, video output amplitude index is 700 ± 30mV.
Automatically during the synchronous amplitude of test video, the audio video synchronization amplitude is the peak-to-peak value of audio video synchronization output level, and test signal is the capable measuring-signal of CCIR17, and the audio video synchronization amplitude index is 300 ± 20mV.
When k-factor is measured; The vision of human eye has different sensitivitys to different wave distortions, gives different weighting evaluations with different wave distortions by the visual characteristic of human eye, is called the k-factor evaluation assessment; Test signal adopts the capable measuring-signal of CCIR17, k-factor index request≤4%.
Brightness and the composite test signal of chromatic component amplitude and time with regulation is added tested passage; Its output chromatic component is called look/bright gain inequality to the change of luminance component amplitude ratio; Test signal adopts the 20T pulse test signal of sub-carrier modulation, look/bright gain inequality index request ± 5%.
Brightness and the composite test signal of chromatic component amplitude and time with regulation is added tested passage, and temporal skew is called look/bright time delay and does not wait its output chromatic component to luminance component.Test signal adopts the 20T pulse test signal of sub-carrier modulation, and look/bright time delay does not wait index request≤50ns.
Luminance signal causes that because of passage is non-linear the signal varying level is had different gains after channel transfer, the distortion that therefore causes is a brightness nonlinear distortion.Brightness nonlinear distortion is generally measured with five step signals, brightness nonlinear distortion index request ± 8%.
In the color TV passage, the chrominance carrier that is superimposed upon on the different luminance levels produces different change in gain, is called the differential gain.Test signal adopts five step signals of stack subcarrier, differential gain index request≤8%.
In the color TV passage, the chrominance carrier that is superimposed upon on the different luminance levels produces the different phase variation, is called the differential phase.Test signal adopts five step signals of stack subcarrier, differential phase index request≤8 degree.
The ratio of the random noise amplitude effective value that the nominal value of video signal to noise ratio through the Measurement of Luminance signal amplitude and bandwidth record.Test signal adopts oblique field signal, and is assorted than index request >=56dB.
The video amplitude-frequency characteristic is measured, when signal passes through equipment, the decay that the letter of various frequencies is different; Generally be that frequency is high more, decline, vision signal; General dedicated bandwidth when 3dB (decay frequency) not, but be employed in (frequency spectrum of vision signal is all at 6M) maximum attenuation in the frequency spectrum, standard-required 4.8MHz surpasses 0.8dB; 4.8MHz be no more than 1dB to 5MHz, 5.5MHz at-4dB between the 0.5dB.
The test index of said audio-frequency test module comprises audio frequency output amplitude, audio frequency amplitude-frequency characteristic, audio frequency signal to noise ratio, total harmonic distortion, audio left R channel level difference and audio frequency interchannel crosstalk.
When the audio frequency amplitude-frequency characteristic is measured, being 60Hz-18kHz in frequency range, is reference point with 1kHz, calculates the Frequency and Amplitude characteristic.Test signal is the some single-frequency measuring-signals of 60Hz-18kHz.According to the set top box testing standard, audio frequency amplitude-frequency characteristic index is+1/-2dB.
The audio frequency signal to noise ratio is meant the ratio of audio output signal level and noise level.Test signal is the audio frequency measuring-signal of 1kHz/-8dBFs, audio frequency signal to noise ratio >=70dB.
Audio output level is meant the amplitude of audio frequency output voltage p-p value.Test signal adopts the audio frequency measuring-signal of 1KHz/-20dBFs, audio output level >=-8dBu.
Audio left R channel level difference is meant that when two sound channels are imported the signal of same amplitude output is because the output level difference that circuit gain difference causes is a unit with dB.Test signal is the some single-frequency measuring-signals of 60Hz-18kHz.Audio left R channel level difference≤0.5dB.
The ratio of the signal of telecommunication that total harmonic distortion refers to import and the voice signal of output, unit is a percentage.Test signal adopts the audio frequency measuring-signal of 1kHz/-8dBFs, according to the set top box testing standard, and total harmonic distortion≤1.5%.
The audio frequency interchannel crosstalk is meant in the time of a channel input signal, because the string signal strength signal intensity that interference produced in the past is called is crosstalked, is unit in another sound channel with dB.According to the set top box testing standard, the audio frequency interchannel crosstalk≤-70dB.
The STB networking Auto-Test System of embodiment of the present invention embodiment; Can realize the looking of CATV set-top-box, audio-frequency index parameter are tested automatically and assessed; Being converted into machine to the behavioral test with artificial driving carries out; Save manpower, time and hardware resource greatly, improved testing efficiency.
More than STB networking Auto-Test System and device thereof that the embodiment of the invention provided have been carried out detailed introduction; Used concrete example among this paper principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (3)
1. STB networking Auto-Test System; It is characterized in that; Comprise: digital TV test signal generator, DTV test receiver, STB, audio analysis device, video analyzer and controller; Said digital TV test signal generator, DTV test receiver and STB are electrically connected with said controller respectively; Said controller changes gpib bus through USB and connects said audio analysis device and video analyzer, and said digital TV test signal generator is used to the test signal of the standard that produces, and said DTV test receiver is used for said test signal is modulated into digital signal; Digital signal after the modulation is tested STB as Test input signal, and the test signal after STB will be handled is delivered to corresponding video analyzer respectively, the audio analysis device is analyzed and show.
2. STB networking Auto-Test System as claimed in claim 1; It is characterized in that; Said controller comprises that control test module, standard are provided with module, beginning test module, initialization instrument module, video measurement module and audio-frequency test module; Be provided with in the said standard device module and comprise all STB standard database, said standard is provided with the setting that module is used to accomplish the STB standard; Said beginning test module is used to set up the form of storage data, and in form, adds data storage location information; Said initialization instrument module is used to accomplish the initialization of video analyzer and audio analysis device; The video index that said video index test module is tested comprises that video output amplitude, audio video synchronization amplitude, video look bright gain inequality, video look bright delay inequality, video K system, video are non-linear, the video differential phase, the video differential gain, video signal to noise ratio, video amplitude-frequency characteristic; The test index of said audio-frequency test module comprises audio frequency output amplitude, audio frequency amplitude-frequency characteristic, audio frequency signal to noise ratio, total harmonic distortion, audio left R channel level difference and audio frequency interchannel crosstalk; Said control test module is used to control the operation of each module and the signal of transmission/receiving digital television measuring signal generator, DTV test receiver and STB, accomplishes the test of each item test index.
3. STB networking Auto-Test System as claimed in claim 1 is characterized in that said controller is a computer.
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| CN103179008A (en) * | 2013-03-25 | 2013-06-26 | 广州中大电讯科技有限公司 | High-definition interactive intelligent measurement and control equipment |
| CN107197245A (en) * | 2017-07-06 | 2017-09-22 | 湖南国科微电子股份有限公司 | A kind of method of testing and system of set top box audio frequency and video |
| CN107835459A (en) * | 2017-11-20 | 2018-03-23 | 深圳市亿联智能有限公司 | A kind of tuner performance automatic test methods based on pattern of fusion set top box |
| CN108809345A (en) * | 2018-06-07 | 2018-11-13 | 安徽江淮汽车集团股份有限公司 | Vehicle entertainment system reception signals test device and method |
| CN110944169A (en) * | 2019-12-02 | 2020-03-31 | 军事科学院系统工程研究院军用标准研究中心 | Programmable 4K video signal generator and signal processing method thereof |
| CN111479207A (en) * | 2020-03-17 | 2020-07-31 | 深圳市金锐显数码科技有限公司 | Crosstalk detection method and system and audio analyzer |
| CN113852808A (en) * | 2021-09-24 | 2021-12-28 | 杭州国芯科技股份有限公司 | Automatic testing system and testing method for set top box channel |
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| CN103179008A (en) * | 2013-03-25 | 2013-06-26 | 广州中大电讯科技有限公司 | High-definition interactive intelligent measurement and control equipment |
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| CN110944169A (en) * | 2019-12-02 | 2020-03-31 | 军事科学院系统工程研究院军用标准研究中心 | Programmable 4K video signal generator and signal processing method thereof |
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| CN113852808A (en) * | 2021-09-24 | 2021-12-28 | 杭州国芯科技股份有限公司 | Automatic testing system and testing method for set top box channel |
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Application publication date: 20120801 |