Acoustic source localization method based on geometrical information modeling in enclosure space and adopting single microphone

A closed space, sound source localization technology, applied in the direction of the beacon system using ultrasonic/sonic wave/infrasonic wave, can solve the problem of poor practicability

Inactive Publication Date: 2017-05-31
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0005] In order to overcome the shortcomings of poor practicability of existing sound source localization methods in closed spaces, the

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  • Acoustic source localization method based on geometrical information modeling in enclosure space and adopting single microphone
  • Acoustic source localization method based on geometrical information modeling in enclosure space and adopting single microphone
  • Acoustic source localization method based on geometrical information modeling in enclosure space and adopting single microphone

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Embodiment Construction

[0088] refer to Figure 1-3 . The specific steps of the single-microphone sound source localization method based on geometric information modeling in a closed space of the present invention are as follows:

[0089] The actual enclosed space is a rectangular space, its length, width and height are 0.9m, 1.0m, and 1.2m respectively, and its boundary is an acrylic glass structure. The coordinate origin is set at the bottom corner of the closed space, the microphone is hoisted on the top of the closed space, its coordinates are (0.5m, 0.5m, 1m), and the sound source position coordinates are (0.7m, 0.8m, 0.3m).

[0090] Step 1. Establish a node model containing the geometric information of the closed space. Since the shape of this space is regular, the nodes are evenly distributed. There are 9 nodes on each coordinate axis, and there are 729 nodes in total.

[0091] Step 2. Obtain the system equation for calculating the position of the sound source.

[0092] Step 3. Calculate th...

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Abstract

The invention discloses an acoustic source localization method based on geometrical information modeling in enclosure space and adopting a single microphone and aims to solve the technical problem of poor practicability of the conventional acoustic source localization method in enclosure space. The technical scheme is that n nodes are distributed in a fluid region surrounded by the boundary of the enclosure space and are numbered from 1 to n. Geometrical shapes of the enclosure space and interior objects are constructed by means of the n nodes, and a system matrix for describing mathematical characteristics of the enclosure space is established according to coordinate information of the n nodes; during actual acoustic source localization, acoustic signals under multiple frequencies are measured by the single microphone, the acoustic signals and the system matrix are subjected to joint operation, location information of the acoustic signals is obtained, so that acoustic source localization is realized, and the method is good in practicability.

Description

technical field [0001] The invention relates to a method for localizing a sound source in a closed space, in particular to a method for localizing a sound source with a single microphone based on geometric information modeling in a closed space. Background technique [0002] The problem of sound source localization in a closed space is an important content in acoustics research, and it is widely used in many aspects of people's lives. For example, the positioning of noise sources in aircraft cabins, the intelligent microphone sound transmission control system in conference rooms, and the parking space recognition system in underground garages. The main feature of this type of space is that the environment is complex and the reverberation degree is high, and some small-scale spaces also have serious sound wave interference and diffraction effects, which require high accuracy and stability of sound source localization technology. [0003] The document "Sound Source Localizati...

Claims

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Application Information

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IPC IPC(8): G01S1/72
CPCG01S1/72
Inventor 王海涛曾向阳杜博凯刘延善王璐陈克安
Owner NORTHWESTERN POLYTECHNICAL UNIV
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