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GB/T 26684-2011 (GB/T26684-2011)

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GB/T 26684-2011: PDF in English (GBT 26684-2011)
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...
......
 
(Above excerpt was released on 2015-08-02, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT26684-2011