GB/T 45348-2025 Information technology―Real time locating―Technical specification for sound source locating and imaging system English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS 35.240.50
CCS L 66
National Standards of the People's Republic of China
GB/T 45348-2025
Information technology - Real time locating - Technical specification for Sound source locating and imaging system
信息技术 实时定位 声源定位成像系统技术规范
(English Translation)
Issue date: 2025-02-28 Implementation date: 2025-09-01
Issued by the State Administration for Market Regulation
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative references
3 Terms and Definitions
4 System reference architecture
5 Technical Requirements
6 Test Method
Annex A (Informative) Principles of sound source localization imaging
Annex B (Informative) Microphone array coordinate system settings example
Annex C (Informative) System flow chart
Bibliography
Information technology - Real time locating - Technical specification for sound source locating and imaging system
1 Scope
This document establishes the system reference architecture of 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
There are no normative references to this document.
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
sound source locating and imaging system
software and hardware system used to determine the location of sound sources and show the spatial distribution of sound fields
Note: The principle of sound source localization imaging is shown in Annex A.
3.2
sound pressure level
ratio of the measured sound pressure to the reference sound pressure
Note: See Equation (1) for the calculation formula of sound pressure level L p.
3.3
microphone array
apparatus for sampling the spatial characteristics of an acoustic signal consisting of a plurality of microphones having a defined spatial topology
[Source: GB/T 36464.1-2020, 3.23, modified]
3.4
microphone array coordinate system
taking the center of the microphone array (3.3) as the origin, a spatial three-dimensional rectangular coordinate system established in the receiving plane of the microphone array (3.3) and its normal direction
Note: Annex B gives a way to establish the microphone array coordinate system.
3.5
azimuth angle
horizontal rotation angle of the observed point relative to the positive direction of the x-axis of the microphone array coordinate system (3.4)
3.6
pitch angle
angle at which the observed point is rotated up and down relative to the microphone array coordinate system (3.4) xoz plane
3.7
heat map of sound field distribution
schematic diagram showing the distribution of sound field in space through data visualization technology
3.8
time-frequency figure
image depicting the frequency of a signal as a function of time
3.9
sound source positioning
through the heat map of sound field distribution in space (3.7), the location information of sound source is determined
Note: Annex A gives an introduction to sound source localization based on delay summation algorithm.
3.10
sound source imaging
heat map of sound field distribution in space (3.7) is superimposed with the video image of the corresponding field of view to show the spatial distribution of sound sources in a visual form
3.11
positioning accuracy
degree of consistency between the localization results of the observed point by the acoustic source localization imaging system and the reference results
3.12
positioning precision
under the specified conditions, the consistency of the results of multiple positioning of the observed points by the sound source localization imaging system
4 System reference architecture
4.1 Overall description
The sound source localization imaging system (hereinafter referred to as the "system") determines the position information of the sound source through the sound field distribution heat map in space, and then superimposes the spatial sound field distribution heat map with the video image to show the spatial distribution of the sound source in a visual form.
The system reference architecture can be divided into three parts: data acquisition layer, data processing layer and interaction layer. The system reference architecture is shown in Figure 1, and the system flow chart is shown in Annex C.
4.2 Data acquisition layer
The data acquisition layer includes a camera device, a microphone array, a temperature, humidity and air pressure sensing device and a distance measuring sensing device.
a) The imaging device is used for acquiring real-time image pictures in the pitch angle and azimuth angle ranges.
b) The microphone array is used to acquire sound data in real time.
c) The temperature, humidity and air pressure sensing device is used to obtain original signals characterizing environmental humidity, temperature, pressure and other parameters.
d) The ranging sensing device is used to acquire the original signal characterizing the distance between the observation point and the system. Among them, the observation point can be determined by the auxiliary sight.
4.3 Data processing layer
The data processing layer comprises an image processing module, a sound processing module, an environment perception processing module, a distance measurement processing module, a sound source positioning module, an analysis map generation module and an audio-visual superposition module.
a) The image processing module performs real-time picture cutting according to the pitch angle and azimuth angle range;
b) The sound processing module reads the collected sound data and converts the format thereof;
c) The environment sensing processing module reads the data collected by the temperature, humidity and air pressure sensing device and converts the data into actual measured values, and calculates the actual sound velocity value under the current environmental parameters based on the measured values;
d) The distance measurement processing module reads the data collected by the distance measurement sensing device and converts the data into the actual distance measurement value between the observation point and the system;
e) The sound source localization module processes the collected sound signals and calculates the sound pressure level at different azimuth angles and pitch angles in the field of view of the system.
f) The analysis map generation module generates a map that can be used for analysis, such as a time-frequency map or the like, based on the analysis data of the acoustic source localization module;
g) The acoustic-visual superposition module fuses video images and sound localization information through spatial coordinate conversion to form a video stream with sound source localization imaging information.
