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Sound source locating method and device

A sound source localization and sound source signal technology, which is applied in the field of sound source localization methods and devices, can solve the problems of sound source localization result error and large weighting function, and achieve the effect of accurate acquisition and improved precision

Active Publication Date: 2013-01-02
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above problems, the purpose of the present invention is to provide a sound source localization method, which aims to solve the problem that in the existing sound source localization technology, when the signal-to-noise ratio of the sound source signal changes, the value of the weighting function may become very large, making the sound source Technical problem with large errors in source location results

Method used

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Embodiment 1

[0024] figure 1 The flow of the sound source localization method provided by the first embodiment of the present invention is shown, and only the parts related to the embodiment of the present invention are shown for convenience of description.

[0025] The sound source localization method provided by the embodiment of the present invention includes:

[0026] Step S101 , the microphone array collects sound source signals, and performs preprocessing on the sound source signals collected by any two of the microphones.

[0027] A microphone array is a collection of microphones arranged in a certain way. It is often used in sound source localization technology to collect sound source signals. A set of sound source signals can be obtained. In this step, any two of the microphones collected The sound source signal is preprocessed, including filtering and framing.

[0028] Step S102. Determine the cross power spectral density function of the two preprocessed sound source signals; ...

Embodiment 2

[0036] figure 2 The flow of the sound source localization method provided by the second embodiment of the present invention is shown, and only the parts related to the embodiment of the present invention are shown for convenience of description.

[0037] The sound source localization method provided by the embodiment of the present invention includes:

[0038] Step S201, the microphone array collects the sound source signal;

[0039] Step S202, performing band-pass filtering on the sound source signals collected by any two microphones in the microphone array to obtain two band-pass filtered sound source signals;

[0040] Step S203 , performing windowing and framing processing on the two channels of bandpass filtered sound source signals to obtain two channels of short-term stationary signals.

[0041] The above steps S201-S03 are used as a specific preferred implementation manner of step S101 in the first embodiment.

[0042] In step S201, it is assumed that the sound sour...

Embodiment 3

[0088] image 3 The structure of the sound source localization device provided by the third embodiment of the present invention is shown, and only the parts related to the embodiment of the present invention are shown for convenience of description.

[0089] The sound source localization device provided by the embodiment of the present invention includes:

[0090] Microphone array acquisition preprocessing unit 301, used for microphone array acquisition of sound source signals, and preprocessing the sound source signals collected by any two microphones;

[0091] A cross power spectral density determination unit 302, configured to determine the cross power spectral density function of the two preprocessed sound source signals;

[0092] A weighting function determining unit 303, configured to determine a weighting function adjusted as the current signal-to-noise ratio changes;

[0093] The delay determination unit 304 is configured to determine the value sequence of the cross-...

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Abstract

The invention is suitable for the technical field of sound processing and provides a sound source locating method and device. The method comprises the steps of: collecting sound source signals by utilizing a microphone array and preprocessing the sound source signals collected by any two microphones; confirming a cross-power spectral density function of the two sound source signals; confirming a weighting function adjusted along with the variation of the present signal to noise ratio; confirming a sequence of values of the cross-correlation function of the two sound source signals according to the cross-power spectral density function and the weighting function; confirming the time delay of the sound source singles to two microphones according to the maximum value of the cross-correlation function; and locating the sound source positions according to the permutation distribution of the microphone array and the time delay of the sound source signals to the any two microphones. According to the method and the device, the adopted weighting function can be correspondingly adjusted along with the variation of the present signal to noise ratio to ensure that under the environment that the signal to noise ratio of a sound source is changed, the time delay of the sound source can be accurately obtained through correspondingly adjusting the weighting function, and therefore, the sound source locating accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of sound processing, and in particular relates to a sound source localization method and device. Background technique [0002] In video conferencing, security or in some industrial applications, it is often necessary to locate the sound source, but in some occasions, due to the uncertainty of the external sound source environment, the voice signal is interfered by external noise, which changes the signal-to-noise ratio , in the existing sound source localization technology, a set of sound data is obtained through the microphone array, and after preprocessing, the phase-transformed generalized cross-correlation method (PHAT-GCC) is used to estimate the delay. According to the delay result and the arrangement of the microphones in the microphone array Distribution, the position of the sound source can be determined through the geometric model. In the existing PHAT-GCC method, since the signal-to-noise ratio o...

Claims

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Application Information

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IPC IPC(8): G01S5/22
Inventor 彭迎标邵诗强
Owner TCL CORPORATION
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