GB/T 33665-2023Technical requirements and detecting method of audio and video for digital publication (English PDF)

Foreword

This document complies with the provisions of GB/T 1:1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting:

This document replaces GB/T 33665-2017 "Technical Requirements and Testing Methods for Digital Publications of Audiovisual Programs": With GB/T 33665- Compared with:2017, in addition to structural adjustments and editorial changes, the main technical changes are as follows:

— Deleted the two definitions of "interlaced scanning" and "progressive scanning" (see 3:4 and 3:5 of the:2017 version);

— Changed the definition of "channel" (see 3:5, 3:7 of the:2017 version);

— Changed the definition of "surround sound" (see 3:6,:2017 version 3:8);

— Added "Audio Coding Format Requirements" (see Table 1 and Table 2);

— Added "Basic technical requirements for three-dimensional sound" (see Table 1);

— Added "video encoding format requirements" (see Table 3, Table 4, Table 5);

— Added the "Basic Technical Requirements for Ultra-High Definition Video" and proposed relevant parameter values for ultra-high-definition quality 4K and 8K images: (see 4:2:1);

— Changed the name of the detection equipment "Image Analyzer" (see 6:2, Figure 2,:2017 version of 6:2, Figure 1);

— Changed the name of the testing equipment "digital recorder" (see 6:2, Figure 1, Figure 2,:2017 version of 6:2, Figure 1, Figure 2);

— Changed the name of the testing equipment "audio analyzer" (see 6:2, Figure 1,:2017 version of 6:2, Figure 2);

— Added "memory card, mobile hard disk" as storage media (see Figure 1 and Figure 2):

Please note that some content in this document may be subject to patents: The publisher of this document assumes no responsibility for identifying patents:

This document is submitted by the National Press and Publication Administration:

This document is under the jurisdiction of the National Press and Publication Standardization Technical Committee (SAC/TC527):

This document was drafted by: Beijing Huahun Cultural and Creative Co:, Ltd:, China Press and Publication Research Institute, Central Propaganda Department Publication Product Quality Quality Supervision and Inspection Center, Zhongguancun Audiovisual Industry Technology Innovation Alliance, Atmos Technology Nanjing Co:, Ltd:, Beijing Century Dehong Culture and Art Co:, Ltd: Ltd:

The main drafters of this document: Gu Xuelin, Yan Xinsheng, Hu Fengying, Xia Weinan, Chen Lei, Yang Xiao, Zhang Weimin, Pan Xingde, Lu Jianhao, Wu Xiaoguang, Wang Yujuan:

The previous versions of this document and the documents it replaces are as follows:

— First published as GB/T 33665-2017 in:2017;

— This is the first revision:

Audio and video technical requirements for digital publications and detection methods

1 Scope

This document specifies the basic technical requirements and media requirements for digital publication audio and video, and describes detection methods:

This document is suitable for the production and detection of audio and video of digital publications:

2 Normative reference documents

GB/T 31493-2015

GB/T 33663-2017

IEC 30192

3 Terms and definitions

The following terms and definitions apply to this document: 3:1 sampling frequency sampling frequency The frequency or period at which the analog source signal is sampled:

[Source: GB/T 17191:3-1997,6:4] 3:2 pixel pixel; pictureelement; pel In a display image, the smallest two-dimensional element that can be independently assigned attributes (such as color and intensity):

[Source: GB/T 5271:13-2008,13:08:03] 3:3 quantification Grade the sample values:

[Source: GB/T 3947-1996,14:31] 3:4 sampling The discrete values of a continuous variable obtained at equal or arbitrary time intervals: