GB3174-1995
Characteristics of PAL-D television broadcasting system
PAL-D制电视广播技术规范
GB 3174-1995 is a current mandatory Chinese national standard for Characteristics of PAL-D television broadcasting system. It appears in the Electronics compliance cluster with a product safety focus and has an implementation date of Dec 1, 1996.
Applicability depends on product scope, certification route, competent authority notices and transition rules. Requst for the translation or verify source before using this record in a compliance decision.
Compliance overview
Scope and applicability
This standard specifies the technical characteristics of the PAL-D television broadcasting system. It is strictly applicable to the design, production, and operation of broadcasting center equipment, transmitting devices, receiving equipment, transmission interfaces, and relevant test instruments. It serves as the fundamental compliance benchmark for all analog television broadcast equipment operating within China. It does not cover digital television broadcasting systems.
Technical requirements
The standard comprehensively defines the video signal and synchronization pulse characteristics, including the 625-line scanning method, field frequency, and video bandwidth limits. It details the precise timing parameters for horizontal and vertical synchronization pulses, ensuring proper interlacing and display stability. Furthermore, it specifies the composite video signal characteristics, such as gamma correction values, luminance and chrominance signal composition, and the color subcarrier modulation method. Engineers must adhere strictly to these baseband signal parameters to ensure equipment interoperability. Finally, it outlines the radio frequency (RF) signal characteristics, covering channel bandwidth, vestigial sideband specifications, modulation polarity, and the required power ratio between vision and sound carriers.
Testing methods
Compliance verification heavily relies on the analysis of the 100/0/75/0 color bar signal, which is defined as the primary electrical test signal in the standard's appendix. Testing involves evaluating the luminance and chrominance amplitudes and their respective phase angles using vector diagrams. Engineers must utilize these specified color bar waveforms to calibrate and measure the performance of both transmission and receiving equipment. The standard also references waveform diagrams for verifying timing intervals of synchronization and blanking pulses.
FAQs
What products and equipment are regulated under GB 3174-1995?
The standard applies to the design, production, and operation of PAL-D television broadcasting system equipment, including center devices, transmitting equipment, receiving devices, transmission interfaces, and test instruments.
Are there any updates from the previous version of GB 3174-1995?
GB 3174-1995 replaced the previous standards GB 1385-78 and GB 3174-82. It consolidates and updates the technical specifications to ensure uniformity in PAL-D system broadcasting and reception.
Does GB 3174-1995 align with international PAL standards?
Yes, GB 3174-1995 specifies the domestic technical characteristics for China's PAL-D system. While it shares the fundamental 625-line, 50Hz field rate and 4:3 aspect ratio with international PAL standards, it defines specific RF channel bandwidth and audio-video carrier spacing parameters unique to the Chinese broadcasting environment.
The summary above provides a high-level overview of GB 3174-1995. To ensure complete compliance for your broadcasting and receiving equipment entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 3174-1995 today to access all detailed parameter tables, waveform diagrams, and testing procedures.
Applicability hints
- Type
- Product
- CCS
- M61
- ICS
- 33.160.20
- Competent department
- National Radio and Television Administration
- Technical committee
- National Technical Committee on Radio, Television and Online Audiovisual of Standardization Administration of China
Relationships
Replaces:GB 1385-1978, GB 3174-1982