CN100589586C - A kind of digital television broadcasting acceptance test method and device thereof - Google Patents
A kind of digital television broadcasting acceptance test method and device thereof Download PDFInfo
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Abstract
The invention discloses a kind of digital television broadcasting acceptance test method and device thereof.Transmitting terminal is by TS generator, tested transmitter and transmitting antenna; Receiving terminal comprises reception antenna, tested receiver, code stream analysis device, code stream source module and picture decoding module.TS generator produces pseudo-random code stream and passes through the transmission antennas transmit signal through tested transmitter modulation back; The reception antenna of receiving terminal is by behind the channel receiving broadcast signal, to pseudo-random code stream reduction and be input to and carry out code stream analysis in the code stream analysis device, the picture decoding module is exported in local image code stream input after the conversion in the code stream analysis device, the two kinds of judge modes of the objective quality of reception and the subjective quality of reception that realized are tested in a test process simultaneously, and then improved testing efficiency, simplified test process, has playback function, be applicable to different broadcast transmitted standards and different transmission code speed, guaranteed the consistency of test.
Description
Technical field
The invention belongs to the digital communication field tests, relate to the technology that a kind of Digital Television quality of reception is measured, specifically, the present invention relates to a kind of method that can carry out objective evaluation and subjective assessment simultaneously to the quality of reception.
Background technology
Along with the radio and television digitlization, the fast development of networking and informationization technology, digital television broadcasting has caused a major transformation of broadcast television technique.Digital television broadcasting compares with analog television broadcast that to have a view reception effect good, and antijamming capability is strong, the efficiency of transmission height, and advantages such as supplementary service are provided.Digital television broadcasting is based on information source encoding and decoding, multiplexing, channel coding/decoding and modulation-demodulation technique, transmission be digitized Bitstream signal, the method for testing and the simulated television of its quality of reception and coverage effect had very big difference.
At present, the determination methods of the Digital Television quality of reception mainly contains two kinds.A kind of is method for objectively evaluating, and another kind is a subjective evaluation method.
Method for objectively evaluating is based on the Bit Error Ratio Measurement of transmission system.Tested transmitter will be launched after the pseudo-random code stream modulation, and the receiver received signal is made demodulation, the pseudo-random code stream of reduction transmission.By comparing the difference between the pseudo-random code stream that pseudo-random code stream that transmitting terminal sends and receiving terminal receive one by one, can draw the accurate system transmissions error rate.But because the normal image code stream has randomness, be not easy to comparison and statistics error code, when needing the statistical system transmission error rates, system's transmitted stream adopts pseudo random sequence.Pseudo random sequence has that yard type is known, the random statistical characteristic is good, is convenient to advantages such as comparison and statistics error code.The error rate is defined as: total bit number of the bit number/transmission of the error rate=mistake.Method for objectively evaluating is the error rate of record in the test process, the reference of broadcasting-quality during as practical application, and the error rate surpasses the value (for example 3 * 10 of testing standard regulation
-6) time, test result is judged poor transmission this moment, the error rate is less than the value of testing standard regulation (for example 3 * 10
-6) time, result of determination judges that transmission quality is good at this moment.Method for objectively evaluating has is convenient to operate, add up accurate advantage, can minimum capture the mistake of single bit, and shortcoming is intuitively to reflect that the user watches the image effect of Digital Television.Some coding method (as MPEG2) is though have certain mechanism for correcting errors, can point out that there is mistake in current transmission according to the error correction state of source encoding, but this error correction is not based on the accurate comparison to each bit of code stream, can not accurately locate error bit, can not accurately add up the error rate, when the error rate is very big, situation about can't decode also can appear, so can not use as test data accurately.
Subjective evaluation method is based on the picture quality after the code stream decoding of receiver output.By the code stream input picture decoder module that will receive, go back original video image, by tester's assess image quality, thereby obtain the broadcast system transmission quality.The tester makes judgement according to the judgment criteria that test is adopted, and estimates the quality of reception, and judgment criteria China mainly adopts GB7401-1987 " colour TV picture quality subjective evaluation method ".The subjective evaluation method system constructing is simple, and is approaching with the actual broadcast situation, still, is not easy to write down the state of makeing mistakes, and the statistics inaccuracy can only the statistical approximation test result.And according to the operating characteristic of picture decoding module, some little error code can be corrected by decoded device, can't reflect image lesion, and some error of transmission meeting is left in the basket like this, so just brings ambiguity to test result.
When using these two kinds of evaluation methods to test, the code stream of broadcast system transmission is of different nature, when using subjective assessment, transmission be image code stream, the tester observes the image that receives back decoding reduction, obtains transmission evaluation; And when using objective evaluation, transmission be pseudo random sequence, testing equipment draws the error rate by receiving the contrast that code stream and source code flow.The reception that two kinds of test results are judged is approaching, but incomplete same.
For example, cover in the process of mobile test in broadcasting, testing vehicle need be in tested receiving area according to specific route running.Traditional method of testing can only select to transmit a kind of among both of pseudo random sequence or image code stream in the middle of test route travels, once the result that obtains of test can only be " error rate " or " judge of image reception ".Though the method that the tester can select same route to travel repeatedly obtains this two kinds of results respectively, but this kind method has expended the man power and material more, and, site environment can't reappear fully, on same route, because the change of on-the-spot vehicle, environment has produced the time variation of channel, the environment of test for the second time and test for the first time is not identical, can only make approximation ratio.
Summary of the invention
The present invention proposes a kind of digital television broadcasting acceptance test method and device thereof, the pseudo random sequence input comparator of receiver output is compared, measure Digital Television simultaneously and receive the error rate and picture quality, add up the accurate error rate, image code stream is produced and the same laser propagation effect of pseudo random sequence test; And the conversion that simultaneously image code stream is produced error code according to the position of error bit, the two kinds of judge modes of the objective quality of reception and the subjective quality of reception that realized are tested in a test process simultaneously, and then improved testing efficiency, simplified test process, have playback function, guaranteed the consistency of test.
A kind of digital television broadcasting acceptance test device is made up of transmitting terminal and receiving terminal, and transmitting terminal is made up of TS generator, tested transmitter and transmitting antenna; Receiving terminal comprises reception antenna, tested receiver and picture decoding module, code stream analysis device and code stream source module.Described code stream analysis device is used for the pseudo random streams of the visual code stream of code stream source module input and tested receiver reduction is handled respectively and analyzed; The TS generator of transmitting terminal produces pseudo-random code stream and passes through the transmission antennas transmit broadcast singal through tested transmitter modulation back; The reception antenna of receiving terminal to the pseudo-random code stream reduction, is separated the mediation channel-decoding by behind the channel receiving broadcast signal in tested receiver; Pseudo-random code stream after the reduction is input in the code stream analysis device and is pre-stored in wherein and the pseudo noise code identical with TS generator output carried out code stream analysis, the local image code stream of code stream source module is input in the code stream analysis device error code position according to storage and carries out negate with the bit of the same position of pseudo random sequence error code in image code stream, make image code stream produce same error code, export to the picture decoding module after the image code stream conversion.
Wherein said code stream analysis device is made up of controller, comparator, memory and converter.Pseudo-random code stream after the tested receiver reduction is input in the comparator of code stream analysis device, pseudo-random code stream after reduction under the effect of controller in comparator with pre-stored, export identical pseudo-random code stream with TS generator and judge and compare, and count accurate transmission error rates, then the error code position situation is stored in the memory.The local image code stream input of code stream source module in converter according to the error code position of memory and comparator output, bit with the same position of pseudo random sequence error code in image code stream carries out negate, make image code stream produce same error code, export to the picture decoding module after the image code stream conversion.
Described converter can produce wrong conversion to the local image code stream of the multichannel of code stream source module input simultaneously according to the error bit positional information.
The processing code stream frame structure that the local image code stream input of described converter is adopted is identical with the pseudo-random code stream frame structure of broadcast transmission.
Described code stream source module is combined by the code stream source of a plurality of different coding types, exports the code stream of multichannel different coding type simultaneously.
Described picture decoding module is formed by the decoder combination of a plurality of different coding types, simultaneously the code stream of multichannel different coding type is decoded.
A kind of digital television broadcasting acceptance test method, form by following steps:
Step 1: the TS generator of transmitting terminal produces pseudo-random code stream and passes through the transmission antennas transmit broadcast singal through tested transmitter modulation back.
Step 2: behind the reception antenna receiving broadcast signal of receiving terminal, in tested receiver,, separate the mediation channel-decoding to the pseudo-random code stream reduction.
Step 3: the pseudo-random code stream after the reduction is input in the comparator of code stream analysis device, under the effect of controller, make pseudo-random code stream in comparator, judge and compare, and count accurate transmission error rates, then the error code position situation is stored in the memory.
Step 4: memory sends to the error code position of storage in the converter, the local image code stream of code stream source module is input in the converter of code stream analysis device, error code position according to the pseudo random sequence of storing in the memory, to carry out negate with the bit of the same position of pseudo random sequence error code in the image code stream, make image code stream produce same error code, export to the picture decoding module after the image code stream conversion.The image code stream length of converter input is identical with the pseudo random sequence length in the step 3.
Described step 3 and step 4 also can be carried out simultaneously, pseudo-random code stream after the reduction is input in the comparator of code stream analysis device, under the effect of controller, make pseudo-random code stream in comparator, judge and compare, the error of transmission that the channel disturbance that is different bit causes, comparator carry out that error bit quantity adds up and the position of error bit in pseudo-random code stream sent to converter.The local image code stream input translator that the code stream source module is identical with pseudo random sequence length, and according to errors present information inversion operation is carried out in same bit position in the local image code stream input at once, make image code stream produce same error code, output to the picture decoding module.The comparator statistics error rate in during this period of time, and send to controller shows objective quality of reception test result as this test by controller to the user.
In the described step 4, the processing code stream frame structure that the local image code stream input of described converter is adopted is identical with the pseudo-random code stream frame structure of broadcast transmission.
The advantage of the present invention's a kind of digital television broadcasting acceptance test method and device thereof is:
(1) compares in the pseudo random sequence input comparator with receiver output, measure Digital Television simultaneously and receive the error rate and picture quality, add up the accurate error rate, image code stream is produced and the same laser propagation effect of pseudo random sequence test;
(2) simultaneously image code stream is produced the conversion of error code according to the position of error bit, the two kinds of judge modes of the objective quality of reception and the subjective quality of reception that realized are tested in a test process simultaneously, and then improved testing efficiency, simplified test process, have playback function, guaranteed the consistency of test.
Description of drawings
Fig. 1 is the modular structure block diagram of a kind of digital television broadcasting acceptance test of the present invention device;
Fig. 2 is the flow chart of steps of a kind of digital television broadcasting acceptance test of the present invention method;
Fig. 3 is the process chart of the step 3, four of a kind of digital television broadcasting acceptance test of the present invention method when carrying out simultaneously.
Among the figure: 1. TS generator 2. tested transmitter 3. transmitting antennas 4. reception antennas 5. tested receiver 6. code stream analysis devices 601. comparators 602. controllers 603. memories 604. converters 7. picture decoding modules 8. code stream source modules
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Digital television broadcasting acceptance test method of the present invention and device are applicable to different broadcast transmitted standards and different transmission code speed.The test process of testing simultaneously at following 1 pseudo random sequence of Digital Television Terrestrial Broadcasting transmission standard (DTMB) and 2 image code streams illustrates principle of the present invention as embodiment.Described test macro only is exemplary, the invention is not restricted to described broadcast system and test code streams.For example, the present invention can also be applied to 1 pseudo random sequence and 1 image code stream is tested simultaneously, 1 pseudo random sequence and the individual image code stream of N (N 〉=1, N is a natural number) are tested simultaneously.In addition, the present invention can be applied to other digit broadcasting systems, comprises digital audio broadcast system, Radio Data System etc.
In the present embodiment, tested transmitter and receiver adopts the transmitter and receiver of China Digital TV terrestrial broadcasting transmission standard (DTMB), and it is X that pseudo random sequence adopts generator polynomial
23+ X
18+ 1 pseudo random sequence, the image code stream source module sends 2 image code streams simultaneously, one of them is a MPEG2 coding TS code stream, another is a MPEG4 coding TS code stream, the bit rate of pseudo-random code stream and image code stream is 5Mbps, send Bao Changwei 188 bytes, the picture decoding module is decoded to two kinds of code streams simultaneously, and it is reduced to picture signal.
As shown in Figure 1, a kind of digital television broadcasting acceptance test device is made up of transmitting terminal and receiving terminal, and transmitting terminal comprises TS generator 1, tested transmitter 2 and transmitting antenna 3; Receiving terminal comprises reception antenna 4, tested receiver 5, code stream analysis device 6, code stream source module 8 and picture decoding module 7.Described code stream analysis device 6 is used for the pseudo random streams of the visual code stream of code stream source module 8 inputs and tested receiver 5 reduction is handled respectively and analyzed.TS generator 1 carries pseudo random sequence A as sending data, tested transmitter 2 emission radio frequency broadcasting signals to tested transmitter 2; Tested receiver 5 receiving broadcast signals through separating the mediation channel-decoding, flow to the code stream A ' that reduces in the comparator 601 of code stream analysis device 6.
In code stream analysis device 6 inside, under a kind of mode of operation, send instruction by controller 602, in comparator 601 the code stream A ' of reduction be pre-stored in comparator 601 in carry out synchronous, the comparison of pseudo random sequence with the TS generator 1 identical pseudo-random code stream A that export, the statistics transmission error rates, and the error rate sent to controller 602, controller 602 shows the error rate to the user, as the objective evaluation quality of reception test result of this test.Simultaneously, comparator 601 with the bit that makes a mistake in pseudo-random code stream A the position information stores in memory 603, until this EOT, the quality of test pattern code stream in the transmission channel of this test if desired is with the converter 604 in MPEG2 code stream source transmitted stream B in the code stream source module 8 and the MPEG4 code stream source transmitted stream C input code flow analyzer 6; Send instruction by controller 602 to comparator 601, make comparator 601 from memory 603 read error bit position recorded information to converter 604.
Under another mode of operation, under controller 602 controls, code stream A ' after 601 pairs of reduction of receiving of comparator be pre-stored in comparator 601 in compare with the TS generator 1 identical pseudo-random code stream A that exports, the error of transmission that the channel disturbance that is different bit causes, comparator 601 carry out that error bit quantity adds up and the position of error bit in code stream A sent to converter 604.
Described converter 604 can produce wrong conversion to a plurality of local image code stream of code stream source module 8 inputs simultaneously according to the error bit positional information.
A kind of digital television broadcasting acceptance test of the present invention method as shown in Figure 2, comprises the steps:
Step 1: store pseudo-random code stream A in the TS generator 1 of transmitting terminal, code stream A is generator polynomial X
23+ X
18+ 1 pseudo random sequence, TS generator 1 send pseudo-random code stream A incessantly to tested DTMB transmitter 2, and the transmission bit rate is 5Mbps, and tested DTMB transmitter 2 is launched broadcast singal incessantly by transmitting antenna 3 after code stream A is modulated;
Step 2: behind reception antenna 4 receiving broadcast signals of receiving terminal, in tested DTMB receiver 5, separate the mediation channel-decoding, restore transmission code stream A ';
Step 3: the code stream A ' after the reduction of exporting after receiver 5 demodulation is input in the comparator 601 of code stream analysis device 6.Be pre-stored with in the comparator 601 and the TS generator 1 identical pseudo-random code stream A that exports.Suppose to put sometime the initial moment that T is a test process, under controller 602 controls, T picks up counting by time point, the code stream A ' after 601 pairs of reduction of receiving of comparator and the pseudo-random code stream A of wherein storage compare, the error of transmission that the channel disturbance that is different bit causes, the error bit quantity of carrying out comparator 601 adds up and the position of misregistration bit in pseudo-random code stream A, suppose to put sometime the termination moment of T ' as test, the time of advent is when putting T ', comparator is added up errored bit number total between time point T and T ', total bit number divided by transmission, obtain the error rate, and the error rate sent to controller 602, controller 602 shows the error rate to the user, as the objective evaluation quality of reception test result of this test.
If the channel between tested transmitter 2 and the tested receiver 3 does not exist any noise and interference, code stream A ' is identical with code stream A so, and the error rate is 0.If have noise or interference, the bit number that makes a mistake and total ratio that sends bit number are the error rate of this test process.When putting T ' time of advent, comparator 601 will describe that positional information outputs in the memory 603 among the known pseudo-random code stream A of error bit in being pre-stored in comparator 601.
Wherein, once wrong storage format is: the continuous number of bit of the bit position+mistake of bag sequence number+wrong start that mistake takes place.
Code stream A ' after time point T after the reduction enters the bag of comparator at first, and the bag sequence number is 1; The bag of back sorts successively, and " the bag sequence number that mistake takes place " storage width is 4 bytes; The packet format that sends is 188 byte lengths, and " bit position of wrong start " scope is 0～188 * 8, and storage width is 2 bytes; " the continuous number of the bit of mistake " scope is 0～188 * 8, and storage width is 2 bytes.If mistake has exceeded the length of a bag continuously, then be stored in the mistake in next bag.For example certain mistake is, has begun to recur the mistake of 20 bits at the 43rd bit of the 5th bag of transmission, and then recorded content is 0X00000005002B0014 (16 system).
Step 4: the quality of test pattern code stream in this transmission channel, with the converter 604 in MPEG2 code stream source transmitted stream B in the code stream source module 8 and the MPEG4 code stream source transmitted stream C input code flow analyzer 6, bit rate is 5Mbps, control from a certain moment by the tester, under controller 602 controls, converter 604 is read error bit position information from memory 603, according to carrying out inversion operation with the same error bit position of code stream A among the image code stream B of 604 pairs of inputs of these information conversion devices and the image code stream C, cause the error code of image code stream B and image code stream C, the image code stream of output is B ' and C ' after the conversion, B ' is input to the MPEG2 decoder in the picture decoding module 7, C ' is input to the MPEG4 decoder in the picture decoding module 7, testing time length is T '-T, observe the output image of two decoders by the tester, draw subjective assessment quality of reception test result.
Another kind of working method is that step 3 and step 4 are carried out simultaneously, and step 1 and step 2 are constant:
As shown in Figure 3, the code stream A ' after the reduction is input in the comparator 601 of code stream analysis device 6, is pre-stored in the comparator 601 as known array with the TS generator 1 identical pseudo-random code stream A that exports.With the converter 604 in MPEG2 code stream source transmitted stream B in the code stream source module 8 and the MPEG4 code stream source transmitted stream C input code flow analyzer 6, bit rate is 5Mbps.Suppose to put sometime the initial moment that T is a test process, under controller 602 controls, time point T begins, code stream A ' after 601 pairs of reduction of receiving of comparator and the code stream A that is pre-stored in the comparator 601 compare, the error of transmission that the channel disturbance that is different bit causes, the error bit quantity of carrying out comparator 601 adds up and the position of error bit in code stream A is directly sent to converter 604, converter 604 carries out inversion operation according to errors present information to image code stream B and the same bit position of C at once, cause the error code of image code stream B and image code stream C, the image code stream of output is B ' and C ' after the conversion, B ' is input to the MPEG2 decoder in the picture decoding module 7, C ' is input to the MPEG4 decoder in the picture decoding module 7, observe the output image of two decoders by the tester, evaluate and test the subjective quality of reception, i.e. objective evaluation test and subjective assessment test are carried out simultaneously.Suppose to put sometime the termination moment of T ' as test, the time of advent is when putting T ', comparator 601 is added up errored bit number total between time point T and T ', total bit number divided by transmission, obtain the error rate, and bit error rate information is sent to controller 602, controller 602 shows bit error rate information to the tester, the tester writes down the error rate, as the objective evaluation quality of reception test result of this test.Simultaneously, when putting T ' time of advent, the tester provides the subjective assessment acceptance test result in section T '-T between this moment by the output image of decoder in the picture decoding module 7.
Under the occasion of Digital Television actual reception, for example use the mobile test car to carry out the acceptance test of certain bar route, need to use subjective assessment and two kinds of criterion of objective evaluation to weigh, because two kinds of transmission code stream differences that criterion is used, in conventional method, can only allow test carriage in same route repeated travel, in the hope of obtaining same transmission channel process, but because the vehicle of site environment, weather, at any time the change of environment, also there is time variation in channel status, broadcast channel state in testing time section T '-T can't reappear fully, so subjective and objectively can only be similar to contrast.As everyone knows, broadcast channel and system transmissions code stream are uncorrelated mutually, the error rate and the image quality of reception of pseudo random sequence have been tested among the present invention simultaneously, finished the test of in a test process, carrying out subjective assessment and objective evaluation simultaneously, and the channel that guarantees both places is identical, and the present invention also can be used for the comparison of error correcting capability between the various information source coding standard.
By using method of the present invention, can make the process of digital television broadcasting acceptance test convenient, reduced workload.According to method of testing of the present invention and device, test process is once finished, raise the efficiency, and have playback function, guaranteed the consistency of test.
Claims (8)
1. a digital television broadcasting acceptance test device is made up of transmitting terminal and receiving terminal, and transmitting terminal is made up of TS generator, tested transmitter and transmitting antenna; Receiving terminal comprises reception antenna, tested receiver and picture decoding module, it is characterized in that: receiving terminal also comprises code stream analysis device and code stream source module, and described code stream analysis device is used for the pseudo random streams of the visual code stream of code stream source module input and tested receiver reduction is handled respectively and analyzed; The TS generator of transmitting terminal produces pseudo-random code stream and passes through the transmission antennas transmit broadcast singal through tested transmitter modulation back; The reception antenna of receiving terminal to the pseudo-random code stream reduction, is separated the mediation channel-decoding by behind the channel receiving broadcast signal in tested receiver; Pseudo-random code stream after the reduction is input in the code stream analysis device and is pre-stored in wherein and the pseudo noise code identical with TS generator output carried out code stream analysis, and the local image code stream of code stream source module is input in the code stream analysis device; Wherein said code stream analysis device is made up of controller, comparator, memory and converter; Pseudo-random code stream after the tested receiver reduction is input in the comparator of code stream analysis device, pseudo-random code stream after reduction under the effect of controller in comparator with pre-stored, export identical pseudo-random code stream with TS generator and judge and compare, and count accurate transmission error rates, then the error code position situation is stored in the memory; The local image code stream of code stream source module is input in the code stream analysis device;
Described code stream analysis device is according to error code position, and the bit with the same position of pseudo random sequence error code in image code stream carries out negate, makes image code stream produce same error code, exports to the picture decoding module after the image code stream conversion.
2. according to the described a kind of digital television broadcasting acceptance test device of claim 1, it is characterized in that: described converter can produce wrong conversion to the local image code stream of the multichannel of code stream source module input simultaneously according to the error bit positional information.
3. according to the described a kind of digital television broadcasting acceptance test device of claim 1, it is characterized in that: the processing code stream frame structure that the local image code stream input of described converter is adopted is identical with the pseudo-random code stream frame structure of broadcast transmission.
4. according to the described a kind of digital television broadcasting acceptance test device of claim 1, it is characterized in that: described code stream source module is combined by the code stream source of a plurality of different coding types, exports the code stream of multichannel different coding type simultaneously.
5. an application rights requires the digital television broadcasting acceptance test method of 1 described device, it is characterized in that, comprises the steps:
Step 1: the TS generator of transmitting terminal produces pseudo-random code stream and passes through the transmission antennas transmit broadcast singal through tested transmitter modulation back;
Step 2: behind the reception antenna receiving broadcast signal of receiving terminal, in tested receiver,, separate the mediation channel-decoding to the pseudo-random code stream reduction;
Step 3: the pseudo-random code stream after the reduction is input in the comparator of code stream analysis device, under the effect of controller, make pseudo-random code stream in comparator, judge and compare, and count accurate transmission error rates, then the error code position situation is stored in the memory;
Step 4: memory sends to the error code position of storage in the converter, the local image code stream of code stream source module is input in the converter of code stream analysis device, error code position according to the pseudo random sequence of storing in the memory, to carry out negate with the bit of the same position of pseudo random sequence error code in the image code stream, make image code stream produce same error code, export to the picture decoding module after the image code stream conversion; The image code stream length of converter input is identical with the pseudo random sequence length in the step 3.
6. a kind of digital television broadcasting acceptance test method according to claim 5, it is characterized in that: described step 3 and step 4 also can be carried out simultaneously, pseudo-random code stream after the reduction is input in the comparator of code stream analysis device, under the effect of controller, make pseudo-random code stream in comparator, judge and compare, the error of transmission that the channel disturbance that is different bit causes, comparator carry out that error bit quantity adds up and the position of error bit in pseudo-random code stream sent to converter; The local image code stream input translator that the code stream source module is identical with pseudo random sequence length, and according to errors present information inversion operation is carried out in same bit position in the local image code stream input at once, make image code stream produce same error code, output to the picture decoding module; The comparator statistics error rate in during this period of time, and send to controller shows objective quality of reception test result as this test by controller to the user.
7. a kind of digital television broadcasting acceptance test method according to claim 5, it is characterized in that: in the described step 4, in the receiving terminal statistics pseudo-random code stream error rate, converter produces wrong conversion to local a plurality of image code stream inputs of code stream source module simultaneously according to the error bit positional information.
8. a kind of digital television broadcasting acceptance test method according to claim 5 is characterized in that: in the described step 4, the processing code stream frame structure that the local image code stream input of described converter is adopted is identical with the pseudo-random code stream frame structure of broadcast transmission.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101540929B (en) * | 2009-04-23 | 2010-09-08 | 北京航空航天大学 | Synchronous time test system of digital television receiver and test method thereof |
| CN102026017B (en) * | 2010-11-29 | 2012-08-08 | 福州瑞芯微电子有限公司 | Efficient test method for video decoding |
| CN102487449A (en) * | 2010-12-02 | 2012-06-06 | 深圳市同洲电子股份有限公司 | Video signal test method of digital television receiving terminal and system thereof |
| CN102231845A (en) * | 2011-06-14 | 2011-11-02 | 深圳市同洲电子股份有限公司 | Method and device for testing front end of digital television |
| CN102523474A (en) * | 2011-10-20 | 2012-06-27 | 江西省南城县网信电子有限公司 | Signal receiving test system based on digital television terrestrial broadcasting (DTTB) |
| CN102932075B (en) * | 2012-11-02 | 2014-09-17 | 丽水市广播电视总台 | Frequency modulation (FM) broadcasting signal receiving and monitoring system |
| CN105141977B (en) * | 2013-06-08 | 2016-09-07 | 山东智慧生活数据系统有限公司 | Multiple-input and multiple-output MIMO-type transmitting-receiving environment measuring device |
| CN105933701A (en) * | 2016-05-11 | 2016-09-07 | 晶晨半导体(上海)有限公司 | System and method for automatically testing DTMB properties |
| CN109862347A (en) * | 2019-01-25 | 2019-06-07 | 国家新闻出版广电总局广播电视规划院 | A kind of TV Safe Broadcasting Evaluation in Support Ability method |
| CN112422956B (en) * | 2020-10-30 | 2024-03-19 | 西安万像电子科技有限公司 | Data testing system and method |
| CN114760014A (en) * | 2021-01-08 | 2022-07-15 | 华为技术有限公司 | Bit error rate testing method and device |
| CN114125685B (en) * | 2022-01-26 | 2022-04-22 | 深圳粤讯通信科技有限公司 | Data processing system for running of Bluetooth headset antenna based on internet |
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