This standard specifies the measurement conditions, electrical performance measurement items and methods of measurement for digital terrestrial set-top box (hereinafter referred to as "set-top box") that supports the terrestrial digital TV receiving function specified in GB 20600-2006.
This standard is applicable to the standard definition and high defination set-top box that supports the terrestrial digital TV receiving function specified in GB 20600-2006.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 3174 Specifications of PAL-D Television System
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 26270-2010 Standard Test Signals for Digital Television Receiving Equipment
GB/T 26681-2011 Technical Requirements and Methods of Measurement for Standard Testing Transmitter of Digital Terrestrial Television
GB/T 26683-2017 General Specification for Digital Terrestrial Set-top Box
GB/T 26685-2017 Methods of Measurement for Digital Terrestrial Set-top Box
SJ/T 11324-2006 Terminology of Digital Television Receiving Equipment
3 Terms, Definitions, Symbols and Abbreviations
3.1 Terms and Definitions
For the purpose of this document, the terms and definitions given in SJ/T 11324-2006 and the following apply.
3.1.1
acceptable error free
threshold of maximum uncorrected error events within the specified time while receiving signals
3.2 Symbols
tD,MAX: the maximum delay of 0dB echo withstandable to set-top box as specified in GB/T 26683-2017.
3.3 Abbreviations
For the purpose of this document, the following abbreviations apply.
AEF: Acceptable Error Free
EPG: Electronic Program Guide
PSI: Program Specific Information
SI: Service Information
UHF: Ultra High Frequence
VHF: Very High Frequence
4 Basic Requirements for Measurement
4.1 General Description
4.1.1 Working conditions
Unless otherwise specified, the set-top box shall be tested in accordance with the standard measurement conditions specified in 4.5.
4.1.2 Measurement site
Measurements shall be made in a room that is not subject to interference from external radio frequency and low frequency electromagnetic fields. If external electromagnetic interference affects the measurement, the measurement shall be made in the shielded room.
4.1.3 Environmental conditions of measurement
4.1.3.1 Measurement conditions
The measurement conditions shall meet the following requirements:
