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GB/T 45657-2025Requirements for audio-visual technology in informationized teaching environment (English PDF)

信息化教学环境视听技术要求

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

May 30, 2025

Implementation date

December 1, 2025

Scope

GB/T 45657-2025 is the English-translated version of 信息化教学环境视听技术要求.

GB/T 45657-2025 is the Chinese national standard covering the classroom treated as a room that has to be seen and heard in — the daylight and the artificial lighting with its luminaires, installation and maintenance, the display system and the visual health limits that apply to eyes looking at a screen all day, the permitted sound level for hearing safety, the noise control and the reverberation, and the sound reinforcement judged on speech intelligibility and echo cancellation. First edition, in force from 1 December 2025. Issued on 30 May 2025, it has been in force since 1 December 2025.

Document preview — GB/T 45657-2025

National Standard of the People's Republic of China

ICS
35.240.99
Classification
L 67

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Contents

  • PrefaceIII
  • 1 Scope1
  • 2 Normative references1
  • 3 Terms and Definitions1
  • 4 Abbreviations2
  • 5 Classification of information-based teaching environment2
  • 5.1 Overview2
  • 5.2 Classification and types based on physical space characteristics2
  • 5.3 Classification and types based on application functional characteristics2
  • 6 Visual technology requirements for information-based teaching environment3
  • 6.1 General requirements3
  • 6.2 Natural lighting requirements3
  • 6.3 Lighting requirements3
  • 6.4 Requirements for lighting fixtures4
  • 6.5 Lighting installation and maintenance requirements4
  • 6.6 Display System4
  • 6.7 Visual health requirements for lighting displays7
  • 7 Auditory technology requirements for information-based teaching environments8
  • 7.1 Requirements for the allowable sound volume for hearing health and safety8
  • 7.2 Noise Control9
  • 7.3 Reverberation Requirements11
  • 7.4 Sound reinforcement system performance requirements15
  • Reference22

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.

This document was proposed and coordinated by the National Information Technology Standardization Technical Committee (SAC/TC28).

This document was drafted by: Tsinghua University, Shanghai Jiaotong University, China National Institute of Standardization, China Electronics Technology Standardization Institute, Nanjing University, South China University of Technology, Wuhan University, Suzhou University of Science and Technology, Huazhong University of Science and Technology, Shenzhen University, Inner Mongolia University, East China Normal University, Chang'an University, University of International Business and Economics, Zhejiang University, Xiamen University, Institute of Acoustics, Chinese Academy of Sciences, People's Education Press, Wenzhou Medical University University of Science and Technology Eye Hospital Group, Suzhou Keda Technology Co., Ltd., Shenzhen Appotronics Co., Ltd., Leyard Optoelectronics Co., Ltd.

Co., Ltd., Nanjing Lopu Co., Ltd., Xiamen Lidaxin Lighting Co., Ltd., Guangdong Sanxiong Aurora Lighting Co., Ltd., Guangdong Qiyuan Acoustic Branch of Architectural Engineering Design Institute Co., Ltd., Shenzhen Ruiqu Information Technology Co., Ltd., Suzhou Huayu Intelligent Technology Co., Ltd.

Shenzhen Taidian Industrial Co., Ltd., Hangzhou Elite Digital Technology Co., Ltd., Chengdu Hipudi Technology Co., Ltd., Xiamen Jieneng Tongguang Electronic Technology Co., Ltd., Guangzhou Seeray Electronic Technology Co., Ltd., Guangdong Xiaotiancai Technology Co., Ltd., Honor Terminal Co., Ltd., Shenzhen Shenzhen Zaihang Intelligent Technology Co., Ltd., the First Affiliated Hospital of Suzhou University, the Eye, Ear, Throat and Nose Hospital of Fudan University, Shenzhen Jizhan Technology Co., Ltd.

Co., Ltd., Beijing Blue Ocean Huaye Technology Co., Ltd., Beijing Tongfang Aweikang Technology Co., Ltd., and Jiangsu Yousheng Education Technology Co., Ltd.

The main drafters of this document are: Zhong Xiaoliu, Shen Hongxing, Cai Jianqi, Chen Xuelin, Li Haixia, Ding Quanlong, Qian Zhen, Zeng Shanshan, Yu Yuntao, Zhang Zejin, Sun Wenjing, Guo Ya, Wu Gengsheng, Song Shuqiang, Du Jing, Ji Zhiyu, Liu Guang, Zheng Li, Chen Xiaoli, Luo Qinping, Chen Hao, Wu Zhanjie, Shasha, Wang Peng, Bi Xiong, Du Jianxin, Zhang Yuyan, Xie Huomu, Jiao Lizhen, Lin Wanxin, Hou Yimen, Hu Tingyu, Zhang Qiu, Liu Kaiwen, Lu Jinzhong, Zhang Peihua, Zheng Jinqi, Li Yingjie, Zhao Mingyuan, Dong Guoguang, Wang Ningli, Deng Wei, Zhang Yunmei, Peng Tao, Liu Hong, Ren Junjun, Shen Ru, Xu Wenbo, Yu Yafeng, Shu Yilai, Shen Yong, Li Xiaodong, Sha Wenjie, Niu Xiaorui, Li Jing, Ye Jingzhi, Cai Yong, Dong Guiguan, and Pan Lijun.

Requirements for audio-visual technology in information-based teaching environment

1 Scope

This document specifies the visual technical requirements for information-based teaching environments and the auditory technical requirements for information-based teaching environments.

This document is applicable to the selection of audio-visual products, environmental design and system integration for information-based teaching environments in teaching institutions, enterprises, community organizations, etc.

2 Normative references

GB/T 5700

GB 7000.1

GB/T 20145-2006

GB/T 28049-2011

GB/T 36447-2018

GB/T 44441-2024

GB 50099

GB 50303-2015

3 Terms and definitions

The terms and definitions defined in GB/T 5700, GB 7000.1 and the following apply to this document.

3.1

A combination of physical space and information space (equipment or system) related to teaching (experiments), scientific research, academic exchanges and other activities.

Note. The form of expression can be one or more independent physical spaces, virtual spaces, or a combination of physical spaces and virtual spaces.

3.2

An indicator parameter for measuring the speech clarity (intelligibility) of a sound reinforcement system.

Note. The speech intelligibility index is rated on a scale of 0 to 1; 1 represents perfect speech transmission and 0 represents completely unclear speech transmission.

3.3

An independent, detachable physical space used for live teaching, non-real-time recording and courseware recording.

3.4

Technology used to eliminate echo and howling during local sound reinforcement and remote interaction.

3.5

Objective parameters for evaluating echo cancellation capabilities in local sound reinforcement and remote interaction.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 28 pages — is available in the English PDF.

Referenced standards

Editions of GB/T 45657

EditionTitleRevisionStatus
GB/T 45657-2025Requirements for audio-visual technology in informationized teaching environmentcurrent editionCurrent

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