GB/T 26684-2017_English: PDF (GB/T26684-2017)
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Methods of measurement for digital terrestrial set-top box
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| Standard ID | GB/T 26684-2017 (GB/T26684-2017) | | Description (Translated English) | Methods of measurement for digital terrestrial set-top box | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | M74 | | Word Count Estimation | 52,588 | | Date of Issue | 2017-09-07 | | Date of Implementation | 2018-04-01 | | Older Standard (superseded by this standard) | GB/T 26684-2011 |
GB/T 26684-2017
Methods of measurement for digital terrestrial set-top box
ICS 33.160.25
M74
National Standards of People's Republic of China
Replace GB/T 26684-2011
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 III
1 range 1
2 Normative references 1
3 Terms and definitions, symbols, 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 2
4.3 Measurement mode 2
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 Channel Decoding Requirements 5
5.3 Transport Stream Decoding Feature Requirements 19
5.4 Baseband video output performance requirements 21
5.5 Audio Output Features 34
5.6 Functional requirements 35
5.7 Power Adaptability Requirements 35
5.8 Power consumption 36
5.9 Standby power consumption 36
Appendix A (Normative) Multipath Channel Model 37
Appendix B (Normative) Acceptable Errors 44
Appendix C (informative) Other multipath channel models 45
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 26684-2011 "Measurement method for terrestrial digital TV receiver", this standard and GB/T 26684-2011
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), “Suppress other multipath channel performance” (see
5.2.21) “Suppression of guard-out-of-band 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, National Digital Audio Video and Multimedia Product Quality Supervision and Inspection
Xin, Shenzhen Digital TV National Engineering Laboratory Co., Ltd., Sichuan Changhong Electric Co., Ltd., Qingdao Hisense Electric Co., Ltd.
Company, Qingdao Haier Electronics Co., Ltd., TCL Group 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 Digital
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., Enzhi
Pu Semiconductor (Shanghai) Co., Ltd., Ruidi Kechuang Microelectronics (Beijing) Co., Ltd., Mai Ling (Shanghai) Microelectronics Co., Ltd., Guangzhou Vision Source
Sub-Technology Co., Ltd., Jiangsu Yinhe Electronics Co., Ltd., National Radio and Television Product Quality Supervision and Inspection Center, Industry and Information
The Fifth Institute of Electronics, Shanghai Digital TV National Engineering Research Center Co., Ltd., Beijing Digital TV Engineering Laboratory Co., Ltd.
Beijing Taihe Zhiyuan Technology Co., Ltd., Shenzhen Haisi Semiconductor Co., Ltd., Jiangsu Electronic Information Product Quality Supervision and Inspection Institute,
Morningstar Software R&D (Shenzhen) Co., Ltd., Lejin Electronic Research and Development Center Co., Ltd., Tianjin Samsung Electronics Co., Ltd., Nanjing Sharp Electric
Subsidiary Co., Ltd., Shandong Matsushita Electronic Information Co., Ltd., Shanghai Suoguang Imaging Co., Ltd., Lianfa Technology (Hefei) Co., Ltd., Samsung Communications
Technology Research Ltd., Rohde & Schwarz (China) Technology Co., Ltd.
The main drafters of this standard. Hu Peng, Chen Renwei, Chang Lin, Wang Pingsong, Wang Wei, Li Yining, Zhang Linjuan, Han Qiufeng, 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 26684-2011.
Ground digital television receiver measurement method
1 Scope
This standard specifies a terrestrial digital TV receiver that supports GB 20600-2006 terrestrial digital TV reception function (hereinafter referred to as
Measurement conditions, electrical performance measurement items, and measurement methods.
This standard applies to standard definition and high definition terrestrial digital TV supporting GB 20600-2006 terrestrial digital TV receiving function.
View 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 3174PAL-D system television broadcasting technical specification
GB 20600-2006 Digital TV terrestrial broadcasting transmission system frame structure, channel coding and modulation
GB/T 22122-2008 Digital TV surround sound sound measurement method
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 26683-2017 General specification for terrestrial digital TV receivers
GB/T 26685-2017 Ground digital television receiver measurement method
SJ/T 11324-2006 Digital TV receiving equipment terminology
3 Terms and definitions, symbols, 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
tD, MAX. The 0 dB maximum echo delay that the receiver specified in GB/T 26683-2017 should be able to withstand.
3.3 Abbreviations
The following abbreviations apply to this document.
AEF. Acceptable Error (AcceptableErrorFree)
EPG. Electronic Program Guide (ElectronicProgramGuide)
PSI. Program Specific Information (ProgramSpecificInformation)
SI. Business Information (ServiceInformation)
UHF. UltraHigh Frequency (UltraHighFrequence)
VHF. Very High Frequency (VeryHighFrequence)
4 basic requirements for measurement
4.1 General instructions
4.1.1 Working conditions
Unless otherwise specified, the receiver shall be tested in accordance with 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.
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 receiver performance does not change significantly over time after the start of the measurement, the receiver should be stable 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 insertion
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 doe......
GB/T 26684-2011
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 33.160.25
M 74
Methods of Measurement for Digital Terrestrial
Set-top Box
ISSUED ON. JUNE 16, 2011
IMPLEMENTED ON. NOVEMBER 1, 2011
Jointly issued by. General Administration of Quality Supervision,
Inspection and Quarantine (AQSIQ);
Standardization Administration (SAC) of the
People’s Republic of China.
Table of Contents
1 Scope ... 4
2 Normative References ... 4
3 Terms, Definitions and Acronyms ... 5
3.1 Term and Definition ... 5
3.2 Abbreviation ... 5
4 Basic Requirements on Measurement ... 5
4.1 General ... 5
4.2 Test Signal... 6
4.3 Measurement System and Instrument ... 6
4.4 Standard Measuring Conditions ... 7
5 Measurement Items and Methods ... 9
5.1 System Chart ... 9
5.2 Requirements on RF Demodulation and Channel Decoding ... 9
5.3 Requirements on Transport Stream Decoding Characteristics ... 21
5.4 Requirements on Baseband Video Output Performance ... 23
5.5 Audio Output Characteristic ... 39
5.6 Requirements on Functions ... 41
5.7 Requirements on Power Adaptability ... 41
5.8 Power Consumption ... 42
5.9 Standby Power Consumption ... 42
Appendix A (Normative) Multipath Channel Model ... 44
Appendix B (Normative) Acceptable Error-free ... 46
Foreword
This Standard is drafted in accordance with the rules specified in GB/T 1.1-2009.
This Standard was proposed by the Ministry of Industry and Information Technology of
the People's Republic of China.
This Standard shall be under the jurisdiction of the National Technical Committee 242
on Audio, Video, Multimedia System and Equipment of Standardization Administration
of China (SAC/TC 242).
Chief drafting organizations. China Electronics Standardization Institute, Shenzhen
CESI Information Technology Co., Ltd., (National Engineering Lab of Electronic
Information Products Standardization), Shanghai Jiaotong University, Qinghua
University, Sichuan Changhong Electric Co., Ltd., Shenzhen Coship Electronics Co.,
Ltd., Sichuan Jiuzhou Electronic Technology Co., Ltd., JiangSu Yinhe Electronics Co.,
Ltd., TCL Corporation, Nanjing Panda Electronics Company Limited, National Digital
Audio, Video and Multimedia Product Quality Supervision and Inspection Center,
Shanghai High Definition Digital Technology Industrial Corporation, Qingdao Hisense
Electric Co., Ltd., Xiamen PRIMA Electronics Co., Ltd., the Third Institute of China
Electronics Technology Group Corporation, Beijing Peony Electronic Technology Co.,
Ltd., Skyworth Group, Shanghai Guangdian Electric Group Co., Ltd., Konka Group,
Qingdao Haier Group, Shenzhen SMIT Co., Ltd., and Hangzhou National Chip
Science & Technology Co. Ltd.
Chief drafting staffs. Hang Subing, Hu Peng, Chen Renwei, Sun Jun, Pan Changyong,
Zhang Xia, Sun Qifeng, Yang Xia, Wang Xuehong, Xu Yan, Liu Minwen, Wang Qiang,
Sun Yuemin, Wang Li, Cheng Xi, Chen Hui, Wu Minghua, Lu Tiemin, Yu Zhiyong, Zhai
Yili, Wang Minghua, Gong Jun, and Fu Liang.
Methods of Measurement for Digital Terrestrial Set-top Box
1 Scope
This Standard specifies the measuring conditions, electric property measurement
items and measurement methods of digital terrestrial set-top box (hereinafter referred
to as set-top box or SB) that supports digital terrestrial television reception function
specified in GB 20600-2006.
This Standard is applicable to standard definition (SD) and high definition (HD) digital
terrestrial set-top boxes that support digital terrestrial television reception function
specified in GB 20600-2006.
2 Normative References
The following documents are essential for the application of this Standard. For the
dated normative references, only the dated editions are applicable to this document.
For the undated references, the latest editions of the normative documents (including
all the amendments) are applicable to this document.
GB/T 3174 Characteristics of PAL-D Television Broadcasting System
GB 3659-1983 Methods of Measurement of Television Video Channel
GB/T 17975.1 Information Technology - Generic Coding of Moving Picture and
Associated Audio Information - Part 1. System (GB/T 17975.1-2010, ISO/IEC
13818-1.2007, MOD)
GB/T 17975.2 Information Technology - Generic Coding of Moving Picture and
Associated Audio Information - Part 2. Video (ITU-TH, 262. 1995, IDT)
GB/T 17975.3 Information Technology - Generic Coding of Moving Picture and
Associated Audio Information - Part 3. Audio (ISO/IEC 13818-3.1998, IDT)
GB 20600-2006 Framing Structure, Channel-Coding and Modulation for Digital
Television Terrestrial Broadcasting System
GB/T 22122-2008 Methods of Measurement of Surround Audio for Digital TV
GB/T 26685-2011 Methods of Measurement for Digital Terrestrial Television
Set-top box
GB/T 26270-2010 Standard Test Signals for Digital Television Receiving
Equipment
SJ/T 11324-2006 Terminology of Digital Television Receiving Equipment
3 Terms, Definitions and Acronyms
3.1 Term and Definition
For the purpose of this Standard, the following terms and definitions AND the ones
defined in SJ/T 11324-2006 apply.
3.1.1
Acceptable error free [Translator. abbreviated as error-free]
Error code events that are not corrected within the specified time are less than a
certain threshold during the signal reception process.
3.2 Abbreviation
AEF — Acceptable error-free;
EPG — Electronic program guide;
PSI — Program specific information;
SI — Service information;
UHF — Ultra high frequency;
VHF — Very high frequency.
4 Basic Requirements on Measurement
4.1 General
4.1.1 Operating conditions
Unless otherwise specified, the tested set-top box (TSB) shall be tested according to
the measuring conditions specified in 4.4.
4.1.2 Measurement site
The measurement shall be carried out in indoor room not subject to the ambient radio
frequency and low frequency electromagnet field interference; if ambient
electromagnet field interferes the measuring results, the measurement shall be done
in a shielded room.
4.1.3 Measurement environment conditions
4.1.3.1 Measurement conditions
Ambient temperature. 15°C~35°C;
Relative humidity. 25%~75%;
Atmosphere pressure. 86kPa~106kPa;
Power. 220×(1±5%) V, 50×(1±2%) Hz.
4.1.3.2 Arbitration conditions
Environment temperature. 20°C±2°C;
Relative humidity. 60%~70%;
Atmosphere pressure. 86kPa~106kPa;
Power. 220×(1±2%) V, 50×(1±1%) Hz;
Power harmonic. (0~5)%.
4.1.4 Stability time
The set-top box shall steadily work at least 15 min under the standard measuring
conditions, in order to guarantee that the set-top box performance does not obviously
change along the time after the measurement begins.
4.2 Test Signal
See GB/T 26270-2010.
4.3 Measurement System and Instrument
For the specific requirements, see Table 1.
Table 1
S/N Equipment name Requirement
1 Digital television measurement transmitter (DTMT) Support 330 operating modes specified in GB 20600-2006
2 Analog television measurement transmitter (ATMT) Carrier frequency and amplitude are adjustable
3 Frequency spectrum analyzer (FSA) Frequency range. 0Hz~1GHz
4 Network analyzer Frequency range. 0Hz~1GHz
5 Video analyzer (VA) Analyze and measure level, frequency, time delay and phase difference
analyzer; and record it as the amplitude-frequency response curve of the
composite video signal.
5.4.4 Brightness signal-to-noise (S/N) ratio of composite video signal
5.4.4.1 Characteristic description
Check the brightness S/N ratio of the composite video output port of the set-top box,
expressed in dB.
5.4.4.2 Test chart
The test chart is shown in Figure 19.
5.4.4.3 Measuring method
a) Connect the test system as Figure 19; the stream generator outputs the small
slope inclination brightness signal;
b) Read out the brightness S/N ratio with a video analyzer, load 100kHz high
pass filter, 6MHz low-pass filter, chrominance subcarrier XXX, declination
compensation and uniform weighting network during the measurement; and
record the reading as the brightness S/N ratio of the composit...
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