CN102487451A - Voice frequency test method for digital television receiving terminal and system thereof - Google Patents
Voice frequency test method for digital television receiving terminal and system thereof Download PDFInfo
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- CN102487451A CN102487451A CN2010105708189A CN201010570818A CN102487451A CN 102487451 A CN102487451 A CN 102487451A CN 2010105708189 A CN2010105708189 A CN 2010105708189A CN 201010570818 A CN201010570818 A CN 201010570818A CN 102487451 A CN102487451 A CN 102487451A
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Abstract
The invention provides a voice frequency test method for a digital television receiving terminal and a system thereof, wherein the system comprises a data acquisition module, an analysis module and a judgment module; the acquisition module is used for receiving the analog voice frequency signal output by the digital television receiving terminal, and then processes the analog signal through AD (Analog and Digital) conversion into a digital signal to be stored in a buffer area; the analysis module is used for calculating the voice frequency index of the above converted digital voice frequency signal-amplitude, frequency and total harmonic distortion; and the judgment module is used for comparing and judging the voice frequency index result value calculated by the analysis module to all the index values specified by the testing standard, and outputs the test result. With the invention, the test efficiency is improved, and the test accuracy is also improved.
Description
Technical field
The present invention relates to measuring technology, relate in particular to the method for testing and the system of the audio frequency of receiving terminal for digital television.
Background technology
Along with popularizing of electronic product, people are more and more abundanter to the demand of the content that electronic product is exported, and are also increasingly high to the audio frequency and video quality requirement of electronic product output simultaneously; With the receiving terminal for digital television is example; Present DTV not only is used to see TV, and it can also be used to listen to the music, and online is played games etc.; In order to satisfy this multi-functional requirement, could go on the market after all will passing through strict audio frequency and video test passes before each receiving terminal for digital television dispatches from the factory.At present; Audio-frequency function test to receiving terminal for digital television all is to accomplish through manual work; When promptly testing, the test man powers on STB and inserts signal, will export signal then and receive television set; Play one section program that contains audio frequency, the test man is through listening to the quality that the set-top box audio function is judged in voice output on the television set.Each tester once can only test a passage of 1 STB like this, and testing efficiency is low.The quality of audio-frequency function is made a decision through listening to voice output by the tester simultaneously, and standard is fuzzy, and False Rate is higher.
Summary of the invention
The present invention provides a kind of audio test system of receiving terminal for digital television, and this method can either practice thrift human cost, improve testing efficiency, also can improve accuracy rating of tests.
The present invention also provides a kind of audio testing method of receiving terminal for digital television, and this system can either practice thrift human cost, improve testing efficiency, also can improve accuracy rating of tests.
A kind of audio test system of receiving terminal for digital television, this system comprises data acquisition module, analysis module, judge module;
Said acquisition module is used for the simulated audio signal of receiving digital television receiving terminal output, and converts said analog signal into digital signal through AD and be stored in buffering area;
Said analysis module is used to calculate the amplitude of the digital audio and video signals after the above-mentioned conversion, frequency, total harmonic distortion degree;
Said judge module is used for each desired value of the audio-frequency index result of the calculating of analysis module and testing standard defined is advanced relatively to judge, outputs test result.
A kind of audio testing method of receiving terminal for digital television, this method comprises:
Step S200 produces digital audio test signal;
Step S202 sends to receiving terminal for digital television with said test signal, and receiving terminal for digital television demodulation digital audio and video signals is simulated audio signal and output;
Step S204 gathers the signal that receiving terminal for digital television is exported, and is translated into analog signal;
Step S206, the analog signal after transforming in the analytical procedure 204 is obtained each index of audio frequency, and said index comprises amplitude, frequency, total harmonic distortion degree;
Step S208, the size of judgement each audio-frequency index value and the standard value obtained outputs test result.
Can find out that from such scheme the present invention carries out audio-frequency test to receiving terminal for digital television efficiently through its test macro direct convenience of pointing out, its do not need artificial one one carry out the subjective judgement audio quality.So its testing efficiency is high, practice thrift human cost, test the accuracy rate height simultaneously.
Description of drawings
Fig. 1 is the structural representation of test macro of the present invention.
Fig. 2 is the schematic flow sheet of audio testing method of the present invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, below in conjunction with embodiment and accompanying drawing, to further explain of the present invention.It is understandable that; Be for disclosed test macro of the present invention and test just are described in embodiment provided by the invention with receiving terminal for digital television; Only be used for explaining the present invention, and be not used for limiting the invention to the test macro and the method for receiving terminal for digital television.
The present invention produces an audio signal input digit television receive terminal through test macro; After receiving terminal for digital television is demodulated into analog signal; Through the data conversion of acquisition module after with demodulation is digital signal; Carry out amplitude, frequency and the total harmonic distortion degree of the tested audio signal of analytical calculation again through analysis module, thereby judge whether the receiving terminal for digital television audio output function reaches standard.Adopt such scheme; Directly each index of measured signal is accurately calculated through test macro; And output test result after each desired value of result of calculation and testing standard regulation compared judgement; Rather than rely on people's hearing to be judged, so test result is accurately objective, testing efficiency is high.
Referring to Fig. 1, be the structural representation of audio test system of the present invention, this system 10 comprises audio signal generation module 11, data acquisition module 13, analysis module 14, judge module 15.
Audio signal generation module 11 is used to produce digital audio test signal, and the digital audio and video signals that is produced is inputed to receiving terminal for digital television carries out demodulation, the analog signal output of receiving terminal for digital television after with demodulation.
Wherein, Said digital audio test signal comprises the tone signal of 1kHz; Frequency and amplitude are all fixed, and are transferred to the measured number television receive terminal through coaxial wire, and receiving terminal for digital television is exported after the audio signal of importing is demodulated into simulated audio signal.
Wherein, fast in order to guarantee acquisition time, image data satisfies the variation demand, and the data acquisition digit rate must be at more than 2 times of audio frequency, adopts 100 times sampling rate in the present embodiment.
Specifically be that the finite length data are handled through the Hanning window function on the 1kHz time domain that just collects of said analysis module 14; And then accurately obtain the power component figure of frequency domain with the fast fourier transform algorithm; Obtain the amplitude of corresponding 1kHz frequency again, frequency, and the harmonic component that possibly occur.
It is understandable that said audio-frequency index includes but not limited to three kinds of foregoing description, its can according to the test demand and different, promptly also can comprise the audio frequency signal to noise ratio, left and right sides level difference or the like index.
Referring to Fig. 2, be the indicative flowchart of audio testing method of the present invention, this method may further comprise the steps:
At step S200, produce digital audio test signal;
Get into step S202, said test signal is sent to receiving terminal for digital television, receiving terminal for digital television demodulation digital audio and video signals is simulated audio signal and output;
At step S204, gather the signal that receiving terminal for digital television is exported, and be translated into analog signal;
At step S206, the analog signal after transforming in the analytical procedure 204 is obtained each audio-frequency index, and wherein said index comprises amplitude, frequency, total harmonic distortion degree;
Calculating the audio-frequency index step is specially: (Hanning window is claimed raised cosine window again through common Hanning window function with finite length data on the 1kHz time domain that collects; It is digital processing field a kind of window function commonly used; When utilization computer realization measurement signal in engineering is handled; Can not measure and computing the signal of endless, analyze but get its limited time slice.Way is time slice of intercepting from signal, carries out periodic extension with the signal time fragment of observing then and handles, and obtains the signal of virtual endless.) handle, and then with the fast fourier transform algorithm (main mathematical tool of Digital Signal Processing be rich in leaf transformation. and Fourier transform is the relation of whole time-domain of research and frequency domain, and window function and Fourier transform are to study one of the digital signal very instrument of key; Apply to a plurality of field of measurement, common like universal instrument, measuring instruments such as frequency spectrograph); Accurately obtain the power component figure of frequency domain; Obtain the amplitude of corresponding 1kHz frequency again, frequency, and the harmonic component that possibly occur.
Get into step S208, judge the size of each audio-frequency index value and the standard value obtained, output test result.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (10)
1. the audio test system of a receiving terminal for digital television is characterized in that, this system comprises data acquisition module (13), analysis module (14), judge module (15); Wherein,
Said acquisition module (13) is used for the simulated audio signal of receiving digital television receiving terminal output, and converts said analog signal into digital signal through AD and be stored in buffering area;
Said analysis module (14) is used to calculate the audio-frequency index of the digital audio and video signals after the above-mentioned conversion; Amplitude, frequency, total harmonic distortion degree;
Said judge module (15) is used for each desired value of the audio-frequency index end value of analysis module calculating and testing standard defined is advanced relatively to judge, outputs test result.
2. the system of claim 1 is characterized in that, said audio-frequency index comprises the amplitude of audio signal, frequency, total harmonic distortion degree.
3. according to claim 1 or claim 2 system; It is characterized in that; Also comprise audio signal generation module (11); Said audio signal generation module (11) is used to produce digital audio test signal, and the digital audio and video signals that is produced is inputed to receiving terminal for digital television carries out demodulation, the analog signal output of receiving terminal for digital television after with demodulation.
4. system as claimed in claim 3 is characterized in that said audio-frequency test signal comprises the tone signal of 1kHz, frequency and amplitude all be fixing with, be transferred to the measured number television receive terminal through coaxial wire.
5. system as claimed in claim 4 is characterized in that, said data acquisition digit rate is more than 2 times of audio frequency.
6. system as claimed in claim 5 is characterized in that, the digit rate of said data acquisition is 100 times of audio frequency step rate.
7. the audio testing method of a receiving terminal for digital television is characterized in that, this method comprises:
Step S204 gathers the signal that receiving terminal for digital television is exported, and is translated into analog signal;
Step S206, the analog signal after transforming in the analytical procedure 204, the index of calculating audio frequency;
Step S208, the size of judgement each audio-frequency index value and the standard value obtained outputs test result.
8. method as claimed in claim 7 is characterized in that, also comprises:
Step S200 produces digital audio test signal;
Step S202 sends to receiving terminal for digital television with said test signal, and receiving terminal for digital television demodulation digital audio and video signals is simulated audio signal and output.
9. like claim 7 or 8 described methods, it is characterized in that the audio-frequency index that is calculated comprises the amplitude of audio signal, frequency, total harmonic distortion degree.
10. method as claimed in claim 9; It is characterized in that; Said calculating audio-frequency index specifically comprises: finite length data on the 1kHz time domain that collects are handled through the Hanning window function, and then accurately obtained the power component figure of frequency domain with the fast fourier transform algorithm, obtain the amplitude of corresponding 1kHz frequency again; Frequency, and the harmonic component that possibly occur.
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| CN2010105708189A CN102487451A (en) | 2010-12-02 | 2010-12-02 | Voice frequency test method for digital television receiving terminal and system thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106791825A (en) * | 2016-12-23 | 2017-05-31 | 深圳创维数字技术有限公司 | A kind of audio automated testing method and terminal |
| CN109379689A (en) * | 2018-10-30 | 2019-02-22 | Oppo广东移动通信有限公司 | Loudspeaker total harmonic distortion measurement method, device, storage medium and measuring system |
| CN109874006A (en) * | 2019-01-09 | 2019-06-11 | 惠州凯珑光电有限公司 | A kind of novel PDM audio-video test macro and method |
| CN113115194A (en) * | 2021-03-25 | 2021-07-13 | 苏州华兴欧立通自动化科技有限公司 | Audio detection device based on DSP and taking ARM as core |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106791825A (en) * | 2016-12-23 | 2017-05-31 | 深圳创维数字技术有限公司 | A kind of audio automated testing method and terminal |
| CN109379689A (en) * | 2018-10-30 | 2019-02-22 | Oppo广东移动通信有限公司 | Loudspeaker total harmonic distortion measurement method, device, storage medium and measuring system |
| CN109874006A (en) * | 2019-01-09 | 2019-06-11 | 惠州凯珑光电有限公司 | A kind of novel PDM audio-video test macro and method |
| CN113115194A (en) * | 2021-03-25 | 2021-07-13 | 苏州华兴欧立通自动化科技有限公司 | Audio detection device based on DSP and taking ARM as core |
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Application publication date: 20120606 |