This standard applies to the basic technical requirements, measurement methods, and functional inspection methods for the clarity part of the unidirectional transmission standard of cable digital TV set-top boxes. Any equivalent measurement method that can ensure the same measurement uncertainty can also be used. In case of dispute, this standard shall prevail. This standard is applicable to the research and development, production, and use of cable digital TV set-top boxes. 2 Normative References: The clauses in the following documents become clauses of this standard through reference in this standard. For dated reference documents, all subsequent amendments (excluding corrected content) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version applies to this standard. GB 2312-1980 Basic Set of Chinese Characters Encoded for Information Interchange GB 8898-2001 Audio Safety Requirements for Video and Similar Electronic Equipment GB 13000.1 Information Technology Universal Multi Octet Coded Character Set (UCS) Part 1: Architecture and Basic Multilingual Plane GB13837-2003 Limits and Measurement Methods for Radio Disturbance Characteristics of Sound and Television Broadcasting Receivers and Related Equipment GB/T 14960-1994 Technical Requirements and Measurement Methods for Infrared Remote Control Transmitters for Television Broadcasting Receivers GB/T 17191.3-1997 Information Technology - Coding of Moving Images and Accompanying Sound on Digital Storage Media with a Data Transmission Rate of 1.5 Mbit/s - Part 3: Audio GB/T 17975.1-2000 Information Technology Movement General coding of images and accompanying audio information - Part 1: System GB/T 17975.2-2000 Information technology - General coding of moving images and accompanying audio signals - Part 2: Video GB/T 17975.3-2002 Information technology - General coding of moving images and accompanying audio signals - Part 3: Audio GY/T 170-2001 Specification for coding and modulation of cable digital television broadcasting channels GY/Z 175-2001 Specification for conditional access systems for digital television broadcasting GY/T 201-2004 According to the Broadcasting Specification GY/T 230-2008 Digital Television Broadcasting Service Information Specification GY/T 231-2008 Digital Television Broadcasting Electronic Program Guide Specification
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China