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Sound intensity estimation sound source orientation method applicable for minitype microphone array

A microphone array, sound intensity technology, applied to direction finders using ultrasonic/sonic/infrasonic waves, systems to determine direction or offset, etc., can solve problems such as performance degradation, poor real-time performance, and reverberation sensitivity, and achieve real-time performance The effect of high and high anti-reverberation ability and spatial noise suppression ability, high azimuth estimation accuracy

Inactive Publication Date: 2015-09-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

For the complex sound intensity method, although it has a strong ability to suppress spatially uncorrelated noise, it is more sensitive to reverberation, and its performance decreases sharply with the increase of reverberation
For the histogram method, when the signal-to-noise ratio is low, its performance is poor, and this method must determine the azimuth by searching the peak, and the real-time performance is poor

Method used

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  • Sound intensity estimation sound source orientation method applicable for minitype microphone array
  • Sound intensity estimation sound source orientation method applicable for minitype microphone array
  • Sound intensity estimation sound source orientation method applicable for minitype microphone array

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Embodiment

[0050] The method of the invention estimates the masking effect of abnormal time-frequency points for instantaneous orientation.

[0051] The masking of abnormal time-frequency points of instantaneous orientation estimation is the key technology of the present invention. To this end, an example is given to illustrate the masking effect on outliers. Considering that the reverberation time is 200ms and the signal-to-noise ratio is 20dB, the real azimuth angle is 120°, and the threshold value is set to 50°. Figure 4 (a) is the distribution of time-frequency points (abnormal time-frequency points) whose instantaneous orientation estimation deviation is greater than 30°. The total number of abnormal time-frequency points is 7167, accounting for 11.29% of the total time-frequency points. After the first threshold judgment and time-frequency masking, the distribution of abnormal time-frequency points is as follows: Figure 4 As shown in (b), the total number of abnormal time-frequ...

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Abstract

The invention discloses a sound intensity estimation sound source orientation method applicable for a minitype microphone array. The method comprises steps of estimating time-frequency graphs of construction directions of all time-frequency points according to sparse characteristics of voice signals and performing local standard deviation evaluation for constant direction estimation values corresponding to selected time sequence blocks by use of sliding windows; then performing tow-value masking processing for the time sequence points according to set local standard deviation threshold parameter values; then, performing re-arrangement for the filtered time sequence points and performing secondary local standard deviation estimation and threshold judgment; and at last, carrying out summation average for constant sound intensity in all directions corresponding to time sequence points satisfying conditions and obtaining estimation values of azimuth angles. Compared to the prior art, the method is provided higher robustness for reverberation and noise and estimation precision of the azimuth angles are higher.

Description

technical field [0001] The invention relates to a method for estimating and directional sound source of sound intensity under an array with a diameter of less than 4cm, and can be used in many fields such as video conferencing systems, robot hearing, hearing aids, human-machine voice interaction systems, and audio monitoring. Background technique [0002] In many practical applications, due to the limitations of the installation platform or system design requirements, only small-sized microphone arrays can be used. However, under the condition of small-sized array aperture, traditional sound source orientation methods such as time-delay estimation method and controllable power beamforming method can no longer meet the requirements of actual orientation accuracy. The method of sound intensity estimation and sound source orientation based on the idea of ​​difference provides an important technical approach for high-precision sound source orientation under the condition of smal...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/802
CPCG01S3/802
Inventor 何赛娟陈华伟丁少为
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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