GB/T 45348-2025Information technology - Real time locating - Technical specification for sound source locating and imaging system (English PDF)

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: iFLYTEK Co., Ltd., China Electronics Technology Standardization Institute, State Grid Anhui Electric Power Co., Ltd. Electric Power Research Institute, Institute of Computing Technology, Chinese Academy of Sciences, Hefei Intelligent Voice Innovation Development Co., Ltd., Hangzhou Weiying Software Co., Ltd. Co., Ltd., China Electric Power Research Institute Co., Ltd., Zhejiang Tidal Power Technology Co., Ltd., Hangzhou Pinbo Technology Co., Ltd., Guoneng Digital Technology Development Co., Ltd. Beijing Development Co., Ltd., Beijing University of Science and Technology, Hefei Sixiang Zhixin Technology Co., Ltd., Beijing Maiding Aite Technology Co., Ltd., Suzhou Xunxi Technology Co., Ltd., Antelope Industrial Internet Co., Ltd., Beijing Jiaotong University, Anhui Tingjian Technology Co., Ltd., Chongqing University of Posts and Telecommunications Tsinghua University, Tsinghua Xunke (Beijing) Technology Co., Ltd., Wuhan University, Zhejiang iFlytek Intelligent Technology Co., Ltd., Institute of Automation, Chinese Academy of Sciences, Beijing Gas Group Research Institute, Beijing Huakong Zhijia Technology Co., Ltd., Shenzhen Gas Group Co., Ltd., China Electronics Technology Group The 54th Research Institute of the Group, Shenzhen Bosi High-tech Co., Ltd., Guangdong Zhongchuang Zhijia Scientific Research Co., Ltd., China Southern Power Grid Digital Power Grid Technology (Guangdong) Co., Ltd., Longyuan Power Group Co., Ltd., China Unicom Intelligent City Research Institute, Shenzhen Yunliwuli Technology Co., Ltd., Zhengzhou Lianrui Electronic Technology Co., Ltd., Hangzhou Zhaohua Electronics Co., Ltd., Beijing Telecom Planning and Design Institute Co., Ltd., Yangtze River Delta Research Institute of University of Electronic Science and Technology of China (Quzhou), Beijing Xinrui Kechuang Technology Co., Ltd., Shenzhen Quanshunhong Technology Co., Ltd., Shanghai Thermal Imaging Technology Co., Ltd., Beijing Shengzhi Technology Co., Ltd., Xi'an Lianfeng Xunsheng Information Technology Co., Ltd. Company, Beijing Disheng Technology Co., Ltd., Changsha Zoomlion Environmental Industry Co., Ltd., Wenzhou Yanchuang Internet of Things Technology Co., Ltd., Yibin Tianlong Communication Co., Ltd., Shenzhen Atem Technology Co., Ltd., Hefei Junxin Electronic Technology Co., Ltd., Xianheng Electrical Technology (Hangzhou Shenzhen) Co., Ltd., Shenzhen Shilian Zhuochuang Technology Co., Ltd., Shenzhen Space-Time Digital Technology Co., Ltd., Shanghai Grubb Technology Co., Ltd., Hangzhou Aihua Instrument Co., Ltd., Huanhong Electronics (Kunshan) Co., Ltd., Shanghai Saimingte Technology Co., Ltd., Jiangsu CESI Technology Development Co., Ltd. company. The main drafters of this document are. Hu Guoping, Zhang Zhang, Song Jiwei, Wang Wenfeng, Cai Mingqi, Zhang Hui, Yang Haitao, Liu Ying, Yang Jie, Hu Xiaoyu, Luo Haiyong, Wu Jiangzhao, Song Ruomiao, Geng Li, Liang Qichen, Zhao Fang, Han Shuai, Li Jun, Huang Jiajia, Wang Xiaoyan, Wang Qu, Xu Minglu, Li Sumin, Liu Xiaowei, Zhou Wei, Gao Ruipeng, Wang Wei, Nie Wendi, Qiu Youbin, Deng Yuejin, Gong Tao, Gao Wei, Che Ming, Liu Jia, Zhang Hao, Li Shuang, Li Qijia, Huang Weibin, Zeng Qiaodi, Zhang Guozhen, Liu Qi, Zhang Min, Xiao Yan, Chai Yujia, Cao Zuyang, Guo Bingfeng, Chen Zhuming, Wang Zhengsheng, Shi Chunlei, Xu Yi, Chen Xiaoliang, Li Xiaoqiang, Huang Yiwei, Yu Xiaoyue, Lin Lingpeng, Zhou Bo, Sun Zhenpei, Li Penghui, Li Wenguo, Xi Xugang, Zhang Tao, Sun Wenhua, Shen Daoyi, Mao Zhide, Liu, S., Chen, M., and Zhao, J.L. Information technology real-time positioning Technical Specifications of Sound Source Localization Imaging System

1 Scope

GB/T 45348-2025 is the Chinese technical specification for acoustic source localisation and imaging systems: the microphone arrays, usually called acoustic cameras, that locate a sound and overlay it on a video image. They are used to find a leak in a compressed air or gas line, a partial discharge on a switchgear panel, a rattle in a vehicle body or a noise source on a machine, and the market for them has grown quickly because a leak survey that used to take a day takes an hour. The standard sets the classification, the composition and the functional requirements of such a system, and then the performance requirements that actually distinguish one instrument from another: the frequency range, the angular resolution and localisation accuracy, the dynamic range, the minimum detectable level, the frame rate and the requirements on the video registration, together with the corresponding test methods and the marking and documentation. For a maker or a buyer of acoustic imaging equipment in China, this is the specification a comparison is made against.

This document establishes the system reference architecture of the sound source localization imaging system, specifies the technical requirements, and describes the corresponding test methods. This document is applicable to the design, development and testing of sound source localization imaging systems.

2 Normative references

This document has no normative references.

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 Sound source locating and imaging system A software and hardware system used to determine the location of sound sources and display the spatial distribution of the sound field.

Note. For the principle of sound source localization imaging, see Appendix A.

3.2 sound pressure level The ratio of the measured sound pressure to the reference sound pressure.

Note. The calculation formula for sound pressure level Lp is shown in formula (1). Lp = 20lg p0 (1) Where. p

--- measured sound pressure, in microPa (µPa); p0

--- sound pressure, the value is 20µPa; Lp

--- sound pressure level, in decibels (dB).

3.3 Microphone arraymicrophonearray A device consisting of multiple microphones with a certain spatial topology for sampling the spatial characteristics of acoustic signals. [Source: GB/T 36464.1-2020, 3.23, modified]

3.4 Microphone array coordinate systemmicrophonearraycoordinatesystem Taking the center of the microphone array (3.3) as the origin, a three-dimensional space is established on the receiving plane of the microphone array (3.3) and its normal direction. Cartesian coordinate system.

Note. Appendix B gives a method for establishing the microphone array coordinate system.

3.5 Azimuthangle The horizontal rotation angle of the observed point relative to the positive direction of the x-axis of the microphone array coordinate system (3.4).