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GB/T 26685-2011 English PDF (GBT26685-2011)

GB/T 26685-2011 English PDF (GBT26685-2011)

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GB/T 26685-2011: Methods of measurement for digital terrestrial television receiver

This Standard specifies the performance measurement items, measurement conditions and measurement method of digital terrestrial television receiver that supports digital terrestrial television reception function specified in GB 20600-2006.
GB/T 26685-2011
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 33.160.25
M 74
Methods of Measurement for Digital Terrestrial
Television Receiver
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 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 ... 6
4.1 General Description ... 6
4.2 Test Signal... 7
4.4 Standard Measuring Conditions ... 8
5 Measurement Items and Method ... 9
5.1 System Chart ... 9
5.2 Requirements on RF Demodulation and Channel Decoding ... 10
5.3 Requirements on Demultiplexing ... 20
5.4 Requirements on Transport Stream Decoding ... 24
5.5 Requirements on Video Characteristics ... 25
5.6 Requirements on Audio Characteristic ... 27
5.7 Requirements on Power Adaptability ... 30
5.8 Whole-set Power Consumption ... 31
5.9 Standby power consumption ... 31
5.10 Requirements on Functions ... 32
Appendix A ... 46
Appendix B ... 48
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 of this Standard. China Electronics Standardization Institute, Shenzheng Saixi Information Technology Co., Ltd. (national engineering lab for electronic information products standardization), Shanghai Jiaotong University, Qinghua University, Sichuan Changhong Electric 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 Electric Co., Ltd., the Third Research Institute of China Electronics Technology Group Corporation, Tianjin University, Beijing Mudan Shiyuan Electronics Technology Co., Ltd., Skyworth Group Co., Ltd., Shanghai Guangdian Electric (Group) Co., Ltd., Konka Group, Qingdao Haier Group, Shenzhen SMIT Co., Ltd., Hangzhou National Chip Science and Technology Co. Ltd., and SOYEA Technology Co., Ltd.
Chief drafting staffs of this Standard. Zhang Subing, Hu Peng, Chen Renwei, Sun Jun, Pan Changyong, Zhang Xia, Sun Qifeng, Yang Xia, Wang Xuehong, Xu Yan, Sun Yuemin, Wang Li, Cheng Xi, Wu Minghua, Lu Tiemin, Yu Zhiyong, Zhai Yili, Wang Minghua, Guan Jun, Fu Liang, and Gao Ge.
Methods of Measurement for Digital Terrestrial
Television Receiver
1 Scope
This Standard specifies the performance measurement items, measurement
conditions and measurement method of digital terrestrial television receiver (hereinafter referred to as receiver) 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 television receivers 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 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 17975.2-2000 Information Technology - Generic Coding of Moving Picture and Associated Audio Information - Part 2. Video (ITU-TH, 262.1995, IDT) GB/T 17975.3-2002 Information Technology - Generic Coding of Moving Picture and Associated Audio Information - Part 3. Audio (ISO/IEC 13818-3.1998, IDT) GB/T 20090.2-2006 Information Technology - Advanced Coding of Audio and Video - Part 2. Video
GB 20600-2006 Framing Structure, Channel Coding and Modulation for Digital Television Terrestrial Broadcasting System
GB/T 22726-2008 Specification for Multichannel Digital Audio Coding Technology GB/T 26270-2010 Standard Test Signals for Digital Television Receiving
Equipment
SJ/T 11157-1998 Methods of Measurement on Receivers for Television Broadcast Transmissions - Part 2. Electrical Measurements on Audio Channels Methods in General and Those for Monophonic Channels
SJ/T 11180-1998 Basic Methods of Measurement of Digital Audio Characteristics of Audio and Audiovisual Equipment
SJ/T 11324-2006 Terminology of Digital Television Receiving Equipment
SJ/T 11345-2006 Methods of Measurement for Digital Television Cathode Ray Tube Displays
SJ/T 11348-2006 Methods of Measurement for Digital Television Flat Panel Displays
3 Terms, Definitions and Acronyms
3.1 Term and Definition
For the purpose of this Standard, the following terms and definitions AND the ones 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 in the signal reception.
3.2 Abbreviation
AEF ?€? Acceptable error-free;
EIT ?€? Event information table;
EIT p/f ?€? EIT present/following;
EPG ?€? Electronic program guide;
MPEG ?€? Moving Picture Experts Group;
NIT ?€? Network information table;
PCR ?€? Program clock reference;
PID ?€? Packet identifier;
PMT ?€? Program map table;
PSI ?€? Program specific information;
SDT ?€? Service description table;
SI ?€? Service information;
TDT ?€? Time and date table;
TOT ?€? Time offset table;
UHF ?€? Ultra high frequency;
UTC ?€? Universal time co-ordinated;
VHF ?€? Very high frequency.
4 Basic Requirements on Measurement
4.1 General Description
4.1.1 Operating conditions
Unless otherwise specified, the receivers shall be tested in the measuring conditions specified in 4.4.
4.1.2 Measurement site
The measurement shall be carried out in indoor room where is not subject to 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.
The measurements on performance parameters of light and color shall be carried out in a dark room where the stray light illumination shall be less than or equal to 1 lx. The acoustical property measurement shall be carried out in an anechoic chamber; and the anechoic chamber shall meet the relevant requirements of SJ/T 11157-1998. 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 receiver shall steadily work at least 15min under the standard measuring conditions, in order to guarantee that the receiver 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
The specific requirements are shown in Table 1.
Table 1
No. Equipment name Requirement
1 Digital television measurement transmitter (DTMT) Support 330 operating modes specified in...

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