CN103442246A - Rapid method for detecting terrestrial digital television product performance under experiment (test) room environment and radio frequency test stream library - Google Patents
Rapid method for detecting terrestrial digital television product performance under experiment (test) room environment and radio frequency test stream library Download PDFInfo
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- CN103442246A CN103442246A CN2013103414131A CN201310341413A CN103442246A CN 103442246 A CN103442246 A CN 103442246A CN 2013103414131 A CN2013103414131 A CN 2013103414131A CN 201310341413 A CN201310341413 A CN 201310341413A CN 103442246 A CN103442246 A CN 103442246A
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Abstract
The invention provides a rapid method for detecting terrestrial digital television product performance under the experiment (test) room environment and a radio frequency test stream library. The radio frequency test stream library is formed through the method that radio frequency test stream recording equipment, instead of a television product to be tested, is connected to a set of test system provided by the invention, the test system sequentially outputs radio frequency test streams according to test items, and all the radio frequency test streams are recorded by the radio frequency test stream recording equipment. The radio frequency test stream library is loaded into radio frequency test stream playing equipment and then directly connected with the product to be tested so as to start testing the product to be tested. The radio frequency test stream library enables detection departments to reduce hardware investment and human resource investment, is simple in detecting method and easy to operate, improves the accuracy of detection work, and guarantees that detection results of all the detection departments are consistent.
Description
Technical field
The invention belongs to the Digital Television technical field of measurement and test, be specifically related to a kind of fast method for terrestrial DTV properties of product detection under experiment (test) room environmental and radio frequency testing stream storehouse.
Background technology
Carrying out the detection of terrestrial DTV properties of product under the condition of existing experiment (test) chamber, is to utilize many instrument and equipments to build a detection platform.These instrument and equipment input signals are baseband signal, as audio frequency, video, data, then by controlling the different channel circumstance of various device emulation, and then main test signal and the disturbed test signal of generation output unlike signal level, finally be mixed to get the test signal that can be used for Performance Detection, to judge whether the terrestrial DTV product normally receives and process, thereby reach the purpose of detection.
Existing test Main Basis standard GB/T 26685-2011 " ground digital television receiver method of measurement " requires test system building, the used test instrument mainly includes the Digital Television test receiver, the simulated television test receiver, spectrum analyzer, network analyzer, audio analyzer, TS generator, Gassian noise generator, impulse noise generator, the multipath channel simulator, multiplexer, blender etc., test event is with reference to 5.2 radio demodulatings of putting down in writing and channel decoding requirement in GB/T 26686-2011 " ground digital television receiver general specification " standard, utilize described testing equipment measuring system constructing, tested receiver is carried out to the detection of regulation test event.
Detection method in the employing standard, advantage is the limit capacity that can accurately detect product, but also has following shortcoming:
(1) used device is many, and investment is large;
Complete a tread digital TV products performance test by existing method of testing, need multiple devices, investment is large.
(2) system complex, operation easier is large;
Need operate more than 10 platform instrument and equipments by existing method, and every equipment operation is all different, connects also differently between the instrument that each test item uses, the experiment of each test item (test) method is also different; These factors cause now methodical operation easier greatly to increase, and training a undergraduate course educational background testing staff at least needs 6 months.
(3) operation link is many, and the misoperation possibility is large;
Existing method, due to system complex, relates to link more, makes the misoperation possibility greatly increase.Misoperation each time all can produce wrong detection data.
(4) the different units that detect show that the testing result inconsistency may be high;
Be equipped with inconsistent, testing staff and detection method understood also to the greatest extent identical because each detects unit testing environment, experiment (test), thereby cause, differently detect units also possibility is inconsistent to the testing result of identical product.
In quality inspection department, as fields such as quality inspection selective examination, factory acceptance, the sampling observations of product line, do not need to detect the limit capacity of product, only wish whether the understanding properties of product reach a certain ability and get final product, wish that detection speed is fast simultaneously, simple to operate, link is the least possible, false drop rate is low, consistency is high as a result.
Summary of the invention
The present invention is directed to quick, accurate, the consistent needs that the terrestrial DTV product detects, propose a kind of fast method for terrestrial DTV properties of product detection under experiment (test) room environmental and supporting radio frequency testing stream storehouse.
The radio frequency testing stream storehouse of detecting for terrestrial DTV properties of product under experiment (test) room environmental provided by the invention, radio frequency testing is flowed to the position access test macro that recording arrangement replaces tested tv product, test macro is exported radio frequency testing stream successively according to each test event, utilizes radio frequency testing stream recording arrangement to record all radio frequency testing stream and forms radio frequency testing stream storehouse.
Described radio frequency testing stream recording arrangement possesses following requirement:
(1) record and play the frequency range covering 50MHz～866MHz of radiofrequency signal;
(2) bandwidth of recording and play radiofrequency signal is not less than 10MHz;
(3) power bracket of recording and play radio-frequency input signals for-10dBm～-90dBm;
(4) the noise of equipment coefficient is less than 4dB;
(5) the if signal sampling precision is greater than 12bit.
Utilize radio frequency testing stream provided by the invention storehouse, the fast method under experiment (test) room environmental, the terrestrial DTV properties of product detect, comprise the steps:
Whether step 4, detection test product normally receive and process, and in this way, test product meets the requirements; Otherwise test product is undesirable;
With existing method of testing, compare, advantage of the present invention and good effect are: (1) proposes to make the required radio frequency testing stream method of test and radio frequency stream storehouse by Specialty Experiment (test) chamber, and during exploitation radio frequency testing stream, equipment cost input, system complexity and operation easier etc. are all born by Specialty Experiment (test) chamber; (2) detect unit and only need purchase a radio frequency testing and spread and put equipment, hardware investment is 150,000 yuans of left and right only, and input greatly reduces; (3) detect unit and only have an equipment, simple to operate, but and just complete operation training at short notice; (4) the Site Detection personnel only need play corresponding radio frequency testing and flow and judge that whether test product normally receives and get final product, easy to operate simply, the misoperation possibility greatly reduces, thereby greatly improves the accuracy of testing; (5) detect unit and all adopt radio frequency testing stream of the present invention storehouse to detect product, avoid the impact of uncertain factor on testing result, make the detection data more accurate, ensured the respectively consistency of the unit's of detection testing result.
The accompanying drawing explanation
Fig. 1 is the test macro schematic diagram of terrestrial DTV product of the present invention;
Fig. 2 is the schematic diagram that the present invention makes radio frequency testing stream storehouse;
Fig. 3 utilizes radio frequency testing stream of the present invention storehouse to detect the schematic diagram of test product.
Embodiment
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is described.
The present invention is directed to quick, accurate, the consistent needs that the terrestrial DTV product detects, the fast method for terrestrial DTV properties of product detection under experiment (test) room environmental provided and supporting radio frequency testing stream storehouse, by following method, realize:
A), by experiment with good conditionsi (test) chamber of detecting exploiting entity's approval, under existing method, utilize the required various device of existing method to form the test macro that detects the terrestrial DTV product.
B) utilize high-precision radio frequency signal recording equipment to record the radio frequency testing stream that test macro produces, each test item correspondence is recorded one section radio frequency testing stream.Time span, signal level, signal modulation parameter, the signal to noise ratio of radio frequency testing stream, the channel condition in radio frequency testing stream, interference signal, baseband signal etc. all should meet the test needs.
The present invention is according to standard GB/T 26685-2011, employing test macro is as shown in Figure 1 detected the performance of digital TV products, and this test macro comprises: the first code stream player 1, the first terrestrial DTV test receiver 2, multipath channel simulation device 3, radio frequency precision attenuator 4, second code stream player 5, the second terrestrial DTV test receiver 6, anolog TV signals generator 7, simulated television test receiver 8, noise signal generator 9, impulse noise generator 10, blender 11, spectrum analyzer 12 and network analyzer 13.
The first code stream player 1 and second code stream player 5 are all exported TS (Transport Stream) stream signal, and interface is ASI (Asynchronous Serial Interface, Asynchronous Serial Interface).
The first terrestrial DTV test receiver 2 and the second terrestrial DTV test receiver 6: be input as TS stream signal, interface is ASI; Be output as terrestrial DTV radiofrequency signal (RF, Radio Frequency), interface is RF BNC.The second terrestrial DTV test receiver 6 is as the disturbed test transmitter.
Multipath channel simulation device 3: be input as the RF signal, interface is RF BNC; Be output as the RF signal through channel simulator, interface is RF BNC.
Radio frequency precision attenuator 4: be input as the RF signal, be output as the RF signal of decay fixed value (dB of unit), interface is RF BNC.
Anolog TV signals generator 7: be output as simulated television base band PAL (Phase Alteration Line) signal (namely composite video signal VBS), interface is VBS BNC.
Simulated television test receiver 8: be input as simulated television base band PAL signal (VBS), interface is VBS BNC; Be output as the simulated television radiofrequency signal, interface is RF BNC.
Noise signal generator 9: be output as white Gaussian noise RF signal, interface is RF BNC.
Impulse noise generator 10: be output as impulsive noise RF signal, interface is RF BNC.
Blender 11 outputs signal to test product and is detected.
Spectrum analyzer 12: the signal power for test by blender 11 outputs.
Network analyzer 13: directly connect test product, the reflection loss of test test product.Method of testing of the present invention and radio frequency testing stream storehouse all do not relate to test test product reflection loss this.
The first terrestrial DTV test receiver 2 receives the TS stream signal of the first code stream player 1 input, and output terrestrial DTV RF signal is to multipath channel simulation device 3.The RF signal of multipath channel simulation device 3 output process channel simulator after radio frequency precision attenuator 4 decay fixed values is to blender 11.The second terrestrial DTV test receiver 6 receives the TS stream signal of second code stream player 5 inputs, and output terrestrial DTV radiofrequency signal is to blender 11.Simulated television test receiver 8 receives the PAL signal of anolog TV signals generator 7 inputs, and output simulated television RF signal is to blender 11.Noise signal generator 9 output white Gaussian noise RF signals are to blender 11.Impulse noise generator 10 output impulsive noise RF signals are to blender 11.
By controlling unlatching and the input signal of individual device, according to the ground digital television receiver method of measurement, complete the Performance Detection to the ground digital TV products.
Utilizing above-mentioned test macro to complete ground digital TV products performance test, need two of code stream players, two of terrestrial DTV test receivers, one of simulated television test receiver, one, anolog TV signals generator, one of multipath channel simulation device, one of noise signal generator, one of radio frequency precision attenuator, one of spectrum analyzer, gross investment needs 3,000,000 yuans of left and right.And use the method need operate more than 10 platform instrument and equipments, because experiment (test) method of every equipment operation and each test item is all different, operation easier is larger, and operation link is many, and the misoperation possibility is also large.
The present invention has designed radio frequency testing stream storehouse in order to realize to fast, the accurately and as one man detection of ground digital TV products, and the making in described radio frequency testing stream storehouse as shown in Figure 2.Utilize the test macro shown in Fig. 1, by the output of blender 11 access radio frequency testing stream recording arrangement 15, record radio frequency testing stream by radio frequency testing stream recording arrangement 15 and form radio frequency testing stream storehouse.Radio frequency testing stream of the present invention storehouse does not relate to the reflection loss test of test product, if therefore need this project of test, need to utilize network analyzer 13 directly test product to be tested.
Radio frequency testing stream recording arrangement 15 need to possess following requirement:
1, record and play the radio frequency signal frequency scope and cover 50MHz～866MHz.
2, record and play the radiofrequency signal bandwidth and be not less than 10MHz.
3, record and play radio-frequency input signals power bracket-10dBm～-90dBm (8MHz bandwidth).
4, the recording arrangement noise factor is less than 4dB.
5, the if signal sampling precision is greater than 12bit.
When being recorded, experiment condition is had to following requirement:
1, full-shield room environmental.
2, test signal is recorded and is adopted the BNC cable to connect, 50 ohmages.
The radio frequency testing stream of recording Rayleigh channel carrier-to-noise ratio thresholding of take is example, and step and the requirement of recording process are described, to recording similarly of other test events:
Program in step 1, the selected radio frequency code stream that need to record, set the first code stream player 1 and broadcast;
The operating frequency of step 3, setting noise signal generator 9 is identical with the operating frequency of the first terrestrial DTV test receiver 2, the power of simultaneously setting noise signal generator 9 output signals is (50-a+x) dBm, a is desirable recording Rayleigh channel carrier-to-noise ratio threshold value, the calibration of power value that x is test macro.Export the output signal of noise signal generator 9 to blender 11.
Parameter x should be calibrated by spectrum analyzer 12, connected mode is for all to be connected noise signal generator 9 into test macro with the first terrestrial DTV test receiver 2, the equal input mixer 11 of the output signal of the output signal of noise signal generator 9 and the first terrestrial DTV test receiver 2 is mixed, utilize spectrum analyzer 12 to read the output signal of blender 11.
At first, the output signal of setting the first terrestrial DTV test receiver 2 is-99dBm that the output signal of noise signal generator 9 is-50dBm that the reading that now reads spectrum analyzer 12 is x1;
Then, the output signal of setting noise signal generator 9 is-99dBm that the output signal of the first terrestrial DTV test receiver 2 is-50dBm that the reading that now reads spectrum analyzer 12 is x2;
Finally, utilize x1 and x2 to obtain the calibration of power value x=x1-x2 of test macro.
Whether step 6, the radio frequency that utilizes spectrum analyzer 12 and the checking of standard testing receiver to record flow signal and meet the requirements, if meet the requirements, recorded radio frequency stream signal are added to radio frequency testing stream storehouse, otherwise, re-start and record.
The radio frequency testing stream obtained must strictly meet in GB/T 26686-2011 standard the requirement for each index subjet, or meets the setting of recording front user, and whether the checking radio frequency stream signal in step 6 meets the requirements, and the concrete grammar of judgement is:
Be the carrier-to-noise ratio thresholding or suppress to disturb intermediate item for test event, perform step 6.1～6.4, for other test events, perform step 6.4:
Step 6.1, the radio frequency recorded stream signal is outputed to spectrum analyzer 12, utilize spectrum analyzer 12 to record the signal power in the 7MHz bandwidth, utilize power spectral density to be scaled the signal power in the 8MHz bandwidth, the note signal power obtained that converts is b.
If step 6.2 test event is the carrier-to-noise ratio thresholding, record the outer signal power of 8MHz bandwidth, obtain the power c that makes an uproar on earth; If test event is disturbed intermediate item for suppressing, record the outer signal power of 8MHz bandwidth, obtain interfering signal power c.
Step 6.3, b-c is obtained to the carrier-to-noise ratio of recording signal, this result and a are contrasted, if absolute difference is greater than 0.2, explanation is recorded successfully, otherwise be judged to be record defective.
Step 6.4, will record successful radio frequency stream signal and broadcast, utilize the standard testing receiver to be verified test event, if normal operation, the signal of recording can be used, include into radio frequency test stream storehouse, otherwise the file that can not flow storehouse as radio frequency testing for, do not include into radio frequency test stream storehouse.
Fast method to terrestrial DTV properties of product detection under experiment (test) room environmental provided by the invention, as shown in Figure 3, radio frequency code stream playback equipment 16 is connected with test product 14, and radio frequency code stream playback equipment 16 loads the radio frequency testing stream storehouse that the present invention records.Concrete steps are as follows.
The radio frequency testing equipment of putting 16 that spreads need to meet the requirement of playing radio frequency testing stream, namely will meet the required concrete broadcast request of above-mentioned radio frequency testing stream recording arrangement 15.As follows:
(1) play the frequency range covering 50MHz～866MHz of radiofrequency signal;
(2) bandwidth of broadcasting radiofrequency signal is not less than 10MHz;
(3) power bracket of playing radio-frequency input signals is-10dBm～-90dBm;
(4) the noise of equipment coefficient is less than 4dB;
(5) the if signal sampling precision is greater than 12bit.
Whether step 4, detection test product 14 normally receive and process, and in this way, test product 14 meets the requirements; Otherwise test product 14 is undesirable.
Claims (6)
1. one kind is flowed storehouse for the radio frequency testing that under experiment (test) room environmental, the terrestrial DTV properties of product detect, it is characterized in that, radio frequency testing is flowed to the position access test macro that recording arrangement replaces tested tv product, test macro requires to export successively radio frequency testing stream according to test event, utilizes radio frequency testing stream recording arrangement to record all radio frequency testing stream and forms radio frequency testing stream storehouse;
Described radio frequency testing stream recording arrangement possesses following requirement:
(1) record and play the frequency range covering 50MHz～866MHz of radiofrequency signal;
(2) bandwidth of recording and play radiofrequency signal is not less than 10MHz;
(3) power bracket of recording and play radio-frequency input signals for-10dBm～-90dBm;
(4) the noise of equipment coefficient is less than 4dB;
(5) the if signal sampling precision is greater than 12bit.
2. radio frequency testing according to claim 1 flows storehouse, it is characterized in that, described test macro, comprise the first code stream player, the first terrestrial DTV test receiver, multipath channel simulation device, radio frequency precision attenuator, second code stream player, the second terrestrial DTV test receiver, anolog TV signals generator, simulated television test receiver, noise signal generator, impulse noise generator, blender and spectrum analyzer;
The first code stream player, the first terrestrial DTV test receiver, multipath channel simulation device are connected successively with the radio frequency precision attenuator; Second code stream player is connected with the second terrestrial DTV test receiver; The anolog TV signals generator is connected with the simulated television test receiver; Radio frequency precision attenuator, the second terrestrial DTV test receiver, simulated television test receiver, noise signal generator and impulse noise generator all are connected the input of blender; The output of blender connects test product;
Two code stream player output TS stream signals; Two ground digital test receivers receive the input of TS stream signal, output terrestrial DTV radiofrequency signal; The multipath channel simulation device receives the input of terrestrial DTV radiofrequency signal, and output is through the digital television radio-frequency signal of channel simulator; The simulated television test receiver receives the PAL signal of anolog TV signals generator input, output simulated television radiofrequency signal; Noise signal generator output white Gaussian noise radiofrequency signal; Impulse noise generator output impulsive noise radiofrequency signal; Blender is exported to test product by the radiofrequency signal received; Spectrum analyzer is for the power of the signal of test mixing device output.
3. radio frequency testing according to claim 2 flows storehouse, it is characterized in that, the calibration of power value x of described test macro, obtain by the following method: the equal input mixer of output signal of the output signal of noise signal generator and the first terrestrial DTV test receiver is mixed, utilize spectrum analyzer to read the output signal of blender;
At first, the output signal of setting the first terrestrial DTV test receiver is-99dBm, and the output signal of noise signal generator is-50dBm, and now to read the output signal of blender be x1 to spectrum analyzer;
Then, the output signal of setting noise signal generator is-99dBm, and the output signal of the first terrestrial DTV test receiver is-50dBm, and now to read the output signal of blender be x2 to spectrum analyzer;
Finally, obtain the calibration of power value x=x1-x2 of test macro.
4. radio frequency testing according to claim 1 and 2 flows storehouse, it is characterized in that, described radio frequency testing stream storehouse meets the requirement of test event or user's setting, whether the radio frequency stream signal that utilizes spectrum analyzer and standard testing receiver checking radio frequency testing stream recording arrangement to record meets the requirements, be the carrier-to-noise ratio thresholding or suppress to disturb intermediate item for test event, execution step 6.1～6.4, otherwise, only perform step 6.4:
Step 6.1, the radio frequency recorded stream signal is outputed to spectrum analyzer, utilize spectrum analyzer to record the signal power in the 7MHz bandwidth, and be scaled the signal power b in the 8MHz bandwidth;
If step 6.2 test event is the carrier-to-noise ratio thresholding, record the outer signal power of 8MHz bandwidth, obtain the power c that makes an uproar on earth; If test event is disturbed intermediate item for suppressing, record the outer signal power of 8MHz bandwidth, obtain interfering signal power c;
Step 6.3, b-c is obtained to the carrier-to-noise ratio of recording signal, this result and desirable recording Rayleigh channel carrier-to-noise ratio threshold value a are contrasted, if absolute difference is greater than 0.2, explanation is recorded successfully, otherwise be judged to be record defective;
Step 6.4, will record successful radio frequency stream signal and broadcast, and utilize the standard testing receiver to be verified test event, if normal operation includes the signal of recording into radio frequency test stream storehouse, otherwise not include into radio frequency test stream storehouse.
5. based on the arbitrary described radio frequency testing stream of claim 1～4 storehouse, a kind of for the fast method that under experiment (test) room environmental, the terrestrial DTV properties of product detect, comprise the steps:
Step 1, described radio frequency testing stream storehouse is loaded into to radio frequency testing spreads and put equipment;
Step 2, radio frequency testing is spread and puts the equipment connection test product;
Step 3, set radio frequency testing spread signal frequency and the signal level of the equipment of putting, play radio frequency testing stream corresponding to test event;
Whether step 4, detection test product normally receive and process, and in this way, test product meets the requirements; Otherwise test product is undesirable;
Step 5, play next section radio frequency testing stream, test product is carried out to the detection of next test event; According to customer requirements, test product is carried out to the detection of all test events, or, when test product does not meet requiring of certain test event, stop detecting.
6. the fast method that terrestrial DTV properties of product according to claim 5 detect, is characterized in that, the described radio frequency testing equipment of putting that spreads possesses following requirement:
(1) play the frequency range covering 50MHz～866MHz of radiofrequency signal;
(2) bandwidth of broadcasting radiofrequency signal is not less than 10MHz;
(3) power bracket of playing radio-frequency input signals is-10dBm～-90dBm;
(4) the noise of equipment coefficient is less than 4dB;
(5) the if signal sampling precision is greater than 12bit.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112887783A (en) * | 2021-01-22 | 2021-06-01 | 广州视源电子科技股份有限公司 | Recording method, recording device, processor and electronic equipment of ATV code stream |
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| CN1551640A (en) * | 2003-05-13 | 2004-12-01 | ���ǵ�����ʽ���� | Test stream generating method and apparatus for supporting various standards and testing levels |
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| CN1551640A (en) * | 2003-05-13 | 2004-12-01 | ���ǵ�����ʽ���� | Test stream generating method and apparatus for supporting various standards and testing levels |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112887783A (en) * | 2021-01-22 | 2021-06-01 | 广州视源电子科技股份有限公司 | Recording method, recording device, processor and electronic equipment of ATV code stream |
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Application publication date: 20131211 |