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GB/T 26685-2017 English PDF

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GB/T 26685-2017: Methods of measurement for digital terrestrial television receiver
Status: Valid

GB/T 26685: Historical versions

Standard IDUSDBUY PDFLead-DaysStandard Title (Description)Status
GB/T 26685-20171079 Add to Cart 7 days Methods of measurement for digital terrestrial television receiver Valid
GB/T 26685-2011125 Add to Cart Auto, < 3 mins Methods of measurement for digital terrestrial television receiver Obsolete

Similar standards

GB/T 19954.2   GB/T 26686   GB/T 26684   GB/T 26683   

Basic data

Standard ID: GB/T 26685-2017 (GB/T26685-2017)
Description (Translated English): Methods of measurement for digital terrestrial television receiver
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: M74
Classification of International Standard: 33.160.25
Word Count Estimation: 54,569
Date of Issue: 2017-09-07
Date of Implementation: 2018-04-01
Older Standard (superseded by this standard): GB/T 26685-2011
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

GB/T 26685-2017: Methods of measurement for digital terrestrial television receiver

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Methods of measurement for digital terrestrial television receiver ICS 33.160.25 M74 National Standards of People's Republic of China Replace GB/T 26685-2011 Ground digital television receiver measurement method Published on.2017-09-07 2018-04-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Administration issued

Content

Foreword I 1 Scope 1 2 Normative references 1 3 Terms, definitions, symbols and abbreviations 1 3.1 Terms and Definitions 1 3.2 Symbol 1 3.3 Abbreviations 1 4 Measurement basic requirements 2 4.1 General Description 2 4.2 Test signal 3 4.3 Measurement mode of operation 3 4.4 Measurement systems and test instruments 3 4.5 Standard measurement conditions 4 5 Measurement items and methods 5 5.1 System Block Diagram 5 5.2 RF Demodulation and Channel Decoding Requirements 5 5.3 Demultiplexing requirements 19 5.4 Transport Stream Decoding Requirements 21 5.5 Video Feature Requirements 22 5.6 Audio Feature Requirements 24 5.7 Power Adaptability Requirements 26 5.8 Power consumption of the whole machine 26 5.9 Standby power consumption 27 5.10 Functional Requirements 27 Appendix A (Normative) Multipath Channel Model 38 Appendix B (Normative) Acceptable Errors 45 Appendix C (informative) Other multipath channel models 46 Reference 51

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 26685-2011 "Measurement Method for Terrestrial Digital Television Receiver", this standard is in line with GB/T 26685-2011 In addition to the editorial changes, the main technical changes are as follows. --- Terms, definitions, symbols and abbreviations add "symbols" (see 3.2); ---Measure the basic requirements to increase the "measurement mode of operation" (see 4.3); --- RF demodulation and channel decoding requirements increase "working mode and modulation parameter changes" (see 5.2.2), "suppress two-path long echo capability" (see 5.2.16), “Suppression of three-path long echo capability” (see 5.2.17), “Suppressing channel perturbation capability 1 under fixed reception conditions” (see 5.2.18), “Suppress channel perturbation capability 2 under fixed reception conditions” (see 5.2.19), “Other multipath channels” (see 5.2.21) “Suppression Protection of out-of-space echo capability" (see 5.2.22) and "RF loop output gain" (see 5.2.23); --- Added Appendix C (informative) other multipath channel models (see Appendix C). Please note that some of the contents of this document may involve patents. The issuing organization of this document is not responsible for identifying these patents. This standard was proposed by the Ministry of Industry and Information Technology of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Audio, Video and Multimedia Systems and Equipment (SAC/TC242). This standard is mainly drafted by. China Electronics Technology Standardization Research Institute, Shenzhen Digital TV National Engineering Laboratory Co., Ltd., National Digital Audio Video and Multimedia Product Quality Supervision and Inspection Center, TCL Group Co., Ltd., Sichuan Changhong Electric Co., Ltd. Division, Qingdao Hisense Electric Co., Ltd., Qingdao Haier Electronics Co., Ltd., Shenzhen Skyworth-RGB Electronics Co., Ltd., BOE Technology Group Co., Ltd., Nanjing Panda Electronics Co., Ltd., Tsinghua University, Gaotuo Xunda (Beijing) Technology Co., Ltd., Shanghai HD Word Technology Industry Co., Ltd., Beijing Haier IC Design Co., Ltd., Beijing Zhongtian Lianke Technology Co., Ltd., Hangzhou Guoxin Technology Co., Ltd. Co., Ltd., Shenzhen Lihe Microelectronics Co., Ltd., Guangzhou Guangsheng Digital Technology Co., Ltd., Shenzhen Core Technology Co., Ltd., En Zhipu Semiconductor (Shanghai) Co., Ltd., Ruidikechuang Microelectronics (Beijing) Co., Ltd., Mailing (Shanghai) Microelectronics Co., Ltd., Guangzhou Vision Electronic Technology Co., Ltd., Jiangsu Yinhe Electronics Co., Ltd., National Radio and Television Product Quality Supervision and Inspection Center, Industry and Letter The Fifth Institute of Electronics of the Ministry of Information, Shanghai Digital TV National Engineering Research Center Co., Ltd., Beijing Digital TV Engineering Laboratory Co., Ltd. Division, Beijing Taihe Zhiyuan Technology Co., Ltd., Shenzhen Haisi Semiconductor Co., Ltd., Jiangsu Province, electronic information product quality supervision and inspection research Institute, Morningstar Software R&D (Shenzhen) Co., Ltd., Lejin Electronic Research and Development Center Co., Ltd., Tianjin Samsung Electronics Co., Ltd., Nanjing Sharp Electronics Co., Ltd., Shandong Matsushita Electronic Information Co., Ltd., Shanghai Suoguang Imaging Co., Ltd., Lianfa Technology (Hefei) Co., Ltd., Samsung Letter Technology Research Co., Ltd., Rohde & Schwarz (China) Technology Co., Ltd. The main drafters of this standard. Hu Peng, Chen Renwei, Chang Lin, Han Qiufeng, Wang Pingsong, Wang Wei, Li Yining, Zhang Linjuan, Wu Wei, Li Wei, Sun Runyu, Pan Changyong, Jia Wei, Liang Weiqiang, Qiang Hui, Yang Guang, Feng Xianghui, Chen Liheng, Xu Wei, Niu Xiaoru, Guo Xiancheng, Han Wenquan, Wang Hongxin, Zhang Jingping, Zhong Zhiyang, Lu Guobing, Jia Kai, Cheng Yang, Zhu Xianliang, Yin Huiqing, Fang Haidong, Shi Yi, Wan Minyong, Han Wenfang, Lin Weifeng, Cao Yu, Yang Xing, Lu Gang, Su Yukun, Liu Yi, Liu Ansheng, Hu Haining, Zhang Wei. The previous versions of the standards replaced by this standard are. ---GB/T 26685-2011. Ground digital television receiver measurement method

1 Scope

This standard specifies terrestrial digital television receivers that support the terrestrial digital television reception function of GB 20600-2006 (hereinafter referred to as Performance measurement items, measurement conditions, and measurement methods. This standard applies to standard definition and high definition terrestrial digital TV supporting GB 20600-2006 terrestrial digital TV receiving function. Depending on the receiver.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB 3174 PAL-D TV broadcasting technical specification GB/T 20090.16 Advanced audio and video coding for information technology - Part 16. Radio and video GB 20600-2006 Digital TV terrestrial broadcasting transmission system frame structure, channel coding and modulation GB/T 22726 multi-channel digital audio codec technical specification GB/T 26270-2010 Digital TV receiving equipment standard test signal GB/T 26681-2011 Technical requirements and measurement methods for terrestrial digital television standard test transmitters GB/T 26686-2017 General specification for terrestrial digital television receivers SJ/T 11157.2 Measurement methods for television broadcast receivers - Part 2. Methods for measuring electrical and acoustic performance of audio channels SJ/T 11324-2006 Digital TV receiving equipment terminology 3 terms, definitions, symbols and abbreviations 3.1 Terms and definitions The following terms and definitions as defined by SJ/T 11324-2006 apply to this document. 3.1.1 Acceptable error acceptablefreefree The error event that was not corrected within the specified time during signal reception is less than a certain threshold. 3.2 symbol The following symbols apply to this document. tD, MAX. The 0 dB maximum echo delay that the receiver specified in GB/T 26686-2017 should be able to withstand. 3.3 Abbreviations The following abbreviations apply to this document. AEF---acceptable error (AcceptableErrorFree); EIT---Event Information Table (EventInformationTable); EITp/f---current/follow-up event table (EITpresent/folowing); EPG---Electronic Program Guide (Electronic Program Guide); MPEG---MovingPictuteExpertsGroup; NIT---Network InformationTable; PCR---Program Clock Reference (ProgramClockReference); PID---Packet Identifier; PMT---Program Map Table (ProgramMapTable); PSI---Program Specific Information (ProgramSpecificInformation); SDT---Service DescriptionTable (ServiceDescriptionTable); SI---Service Information (ServiceInformation); TDT---Time and DateTable (TimeandDateTable); TOT---Time Offset Table (TimeOffsetTable); UHF---UltraHigh Frequency (UltraHighFrequence); UTC---Universe TimeCo-ordinated; VHF---Very High Frequency (VeryHighFrequence).

4 basic requirements for measurement

4.1 General instructions 4.1.1 Working conditions Unless otherwise specified, the test receiver shall be tested at the standard measurement conditions specified in 4.5. 4.1.2 Measurement site The measurement shall be carried out in a room that is free from interference from external RF and low-frequency electromagnetic fields. If external electromagnetic interference affects the measurement result, the measurement is performed. The amount should be carried out in the shielded room. Measurement of performance parameters such as light and color should be performed in a dark room with a stray illuminance less than or equal to 1 lx. The measurement of acoustic performance should be carried out in the anechoic chamber, which complies with the relevant provisions of SJ/T 11157.2. 4.1.3 Measuring environmental conditions 4.1.3.1 Measurement conditions The measurement conditions should meet the following requirements. Ambient temperature. 15 ° C ~ 35 ° C; Relative humidity. 25%~75%; Atmospheric pressure. 86kPa~106kPa; Power supply. 220 × (1 ± 5%) V, 50 × (1 ± 2%) Hz. 4.1.3.2 Arbitration conditions The arbitration conditions shall meet the following requirements. Ambient temperature. 20 ° C ± 2 ° C; Relative humidity. 60%~70%; Atmospheric pressure. 86kPa~106kPa; Power supply. 220 × (1 ± 2%) V, 50 × (1 ± 1%) Hz; Power supply harmonics. 0~5%. 4.1.4 Stabilization time In order to ensure that the performance of the receiver does not change significantly with time after the start of the measurement, the receiver should work stably under standard measurement conditions. 15min. 4.2 Test signal See GB/T 26270-2010. 4.3 Measurement mode The measurement mode of operation is shown in Table 1, where operating mode 11 is only applicable to "operating mode and modulation parameter changes". Table 1 Working mode carrier number Forward error correction Code rate Symbol constellation Mapping Frame header mode Frame head phase Variety Symbol interleaving Option Double pilot insert Net rate Mbps 1 C=3780 0.4 16QAM PN945 Change 720 - 9.626 2 C=1 0.8 4QAM PN595 - 720 Do not insert 10.396 3 C=3780 0.6 16QAM PN945 Change 720 - 14.438 4 C=1 0.8 16QAM PN595 - 720 does not insert 20.791 5 C=3780 0.8 16QAM PN420 Change 720 - 21.658 6 C=3780 0.6 64QAM PN420 Change 720 - 24.365 7 C=1 0.8 32QAM PN595 - 720 does not insert 25.989 8 C=3780 0.8 16QAM PN945 Change 720 - 19.251 9 C=3780 0.6 64QAM PN945 Change 720 - 21.658 10 C=3780 0.8 64QAM PN420 Change 720 - 32.486 11 C=1 0.8 4QAM-NR PN945 No change 240 Insert 4.813 4.4 Measurement systems and test instruments See Table 2 for specific requirements. Table 2 Serial number device name requirement 1 Digital TV test transmitter meets the relevant requirements of GB/T 26681-2011, MER≥36dB

2 analog TV test transmitter

Carrier frequency range. 40MHz~1GHz, amplitude. ≥-10dBm, unwanted transmit power in adjacent channel is less than carrier Power. ≥50dB 3 Spectrum analyzer frequency range. 40MHz~1GHz, average noise level. ≤150dBc/Hz 4 Network analyzer frequency range. 40MHz~1GHz, reflection loss measurement accuracy. ≤0.1dB, impedance. 75Ω 5 power meter measurement accuracy. 0.1W

6 code stream generator output test required code stream

Table 2 (continued) Serial number device name requirement 7 Gaussian noise generator noise bandwidth. ≥ 20MHz; RF output power (8MHz bandwidth). ≥ -50dBm 8-channel simulator analog channel. ≥20 path, Doppler type, delay, amplitude, Doppler shift, phase independent adjustment of each channel 9 The multiplexer digitally multiplexes the input stream signals into a multi-program stream. 10 SI generator edits and generates business information 11 Mixer frequency range. 30MHz~1GHz 4.5 Standard measurement conditions 4.5.1 Measurement channel The minimum received signal power should measure the operating mode 7 performance on all VHF and UHF channels, with the worst results for the project. The measurement result of mode 7. Reflection loss, suppression of analog TV adjacent-frequency interference capability, suppression of digital TV adjacent-channel interference capability in 14 channels (482MHz), 31-frequency The channel (658 MHz) and channel 47 (786 MHz) were measured. Other items were measured on channel 31 (658 MHz). 4.5.2 Standard RF input signal power The RF signal input to the receiver is represented by the average power in the channel (8 MHz). The standard useful input signal power for RF TV signals should be -60 dBm at the RF input. 4.5.3 Analog TV signal The analog TV signal for interference uses PAL-D RF signal, and the modulated video signal is 100/0/75/0 color bar signal, audio signal For 1 kHz signals, other requirements shall be in accordance with GB 3174. Analog TV signal power in intra-channel (8MHz) peak power Said. 4.5.4 Gaussian noise Gaussian noise should cover the interfered channel. Gaussian noise power is expressed as the average power in the interfered channel (8 MHz). 4.5.5 Impulse noise The principle of impulse noise generation is shown in Figure 1. figure 1 The impulse noise power is expressed as the average power of the Gaussian noise generated by the Gaussian noise generator in the interfered channel (8 MHz). 4.5.6 Multipath channel See Appendix A for the multipath channel model. 4.5.7 Standard code stream The test stream program should be no less than 1 minute in length and contain at least one video program and one audio program. Video program should be Active image sequence. When testing and evaluating the system payload data rate is greater than 14 Mbps, the video program included in the test stream should be at least Contains a set of high-definition programs with a basic stream data rate greater than 8 Mbps, a frame rate of 25 Hz, an aspect ratio of 16.9, and a resolution of 1920×1080. The chromaticity parameter is 4.2.0. If the standard stream program is included in the test stream, the frame rate is 25 Hz, the aspect ratio is 4.3, the resolution is 720×576, and the chrominance parameter is 4.2.0.

5 Measurement items and methods

5.1 System Block Diagram The system block diagram is shown in Figure 2. figure 2 5.2 RF Demodulation and Channel Decoding Requirements 5.2.1 Overview This clause accepts the decision threshold with acceptable error. See Appendix B for provisions on acceptable errors. 5.2.2 Working mode and modulation parameter change 5.2.2.1 Feature Description Check if the receiver supports all the operating modes specified in GB 20600-2006, and the receiver automatically changes when the modulation parameters change. Switch time. The automatic switching time unit is seconds (s). 5.2.2.2 Test block diagram The test block diagram is shown in Figure 3. image 3 5.2.2.3 Measurement method The measurement steps are as follows. a) Connect the test system according to Figure 3, the code stream generator outputs a standard moving image sequence (standard code stream data rate is less than or equal to 4.813Mbps), adjust the output power of the digital TV test transmitter, so that the input power of the receiver under test is a standard RF input signal. Power b) Set the digital TV test transmitter frequency to the measured channel frequency, and set the digital TV test transmission according to the working mode 1 in Table 1. Machine working mode parameters; c) Adjust the receiving frequency of the receiver under test to match the frequency of the digital TV test transmitter, and observe whether the image displayed on the screen is normal and The reception status is recorded in Table 3; d) Repeat steps b)~c) in working mode i (i=2~11) to verify the receiving condition of the receiver under test; e) After the test mode 1 of the tested receiver is verified, turn off the RF output of the digital TV test transmitter; f) Digital TV test transmitter working mode 2 After setting the parameters, turn on the digital TV test transmitter RF output, using seconds The table records the switching time T1-2 of the working mode 1 switching to the working mode 2; g) Repeat steps e) to f) in working mode i (i=2~10) to measure switching times T2-3, T3-4, T4-5, T5-6, T6-7, T7-8, T8-9, T9-10, T10-11; h) After the test receiver 11 is verified, the digital TV test transmitter RF output is turned off; i) Digital TV test transmitter working mode 1 After setting the parameters, turn on the digital TV test transmitter RF output, using seconds The table records the working mode 11 to switch to the switching mode T11-1 of the working mode 1; j) Take the average values of T1-2, T2-3, T3-4, T4-5, T5-6, T6-7, T7-8, T8-9, T9-10, T10-11, and T11-1 as Automatically switch time. table 3 Serial number working mode receiving condition switching time 1 1 □ Support □ Not supported - 2 2 □ Support □ does not support T1-2 3 3 □ Support □ does not support T2-3 4 4 □ Support □ does not support T3-4 5 5 □ Support □ does not support T4-5 6 6 □ Support □ does not support T5-6 7 7 □ Support □ does not support T6-7 8 8 □ Support □ does not support T7-8 9 9 □ Support □ does not support T8-9 10 10 □ Support □ does not support T9-10 11 11 □ Support □ does not support T10-11 12 1 - T11-1 5.2.3 Frequency range 5.2.3.1 Feature Description Check if the receiver can receive normally in the VHF and UHF frequency range. 5.2.3.2 Test block diagram The test block diagram is shown in Figure 4. Figure 4 5.2.3.3 Measurement method The measurement steps are as follows. a) Connect the test system according to Figure 4, the code stream generator outputs the standard moving image sequence, and sets the digital TV test transmitter as the working mode. Equation 7, adjusting the output power of the digital TV test transmitter so that the input power of the receiver under test is the standard RF input signal power; b) setting the digital TV test transmitter frequency to the measured channel center frequency; c) Adjust the receiving frequency of the receiver under test to be consistent with the frequency of the digital TV test transmitter, and observe whether the image displayed on the screen is normal; d) If the receiver receives normally, record the channel supported by the receiver under test, otherwise the record is not supported; e) Repeat steps b)~d) on all UHF and VHF channels and record the measurements. 5.2.4 Frequency capture range 5.2.4.1 Feature Description Check the receiver's ability to adapt to carrier frequency deviations in kilohertz (kHz). 5.2.4.2 Test block diagram The test block diagram is shown in Figure 4. 5.2.4.3 Measurement method The measurement steps are as follows. a) Connect the test system according to Figure 4, the code stream generator outputs the standard moving image sequence, and adjusts the output power of the digit......
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