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Spherical harmonic order self-adaptive selection method suitable for spherical microphone array sound source orientation

A microphone array, self-adaptive selection technology, applied in systems that determine direction or offset, direction finders using ultrasonic/sonic/infrasonic waves, systems that eliminate unwanted waves, etc. Influence, susceptibility to noise, erroneous positioning results, etc., to achieve the effect of overcoming the degradation of estimation performance, high orientation accuracy and spatial resolution, and high azimuth estimation accuracy

Active Publication Date: 2019-08-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, the noise amplification effect generated in the mode intensity compensation process makes the high-order eigenbeams susceptible to noise, especially in the low frequency band. The higher the order, the more susceptible to noise, especially for time-frequency points with larger noise. The noise part in the high-order eigenbeam will exceed or even submerge the signal part. If it is used in sound source orientation rashly, it will produce wrong positioning results, which will affect the final result

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  • Spherical harmonic order self-adaptive selection method suitable for spherical microphone array sound source orientation
  • Spherical harmonic order self-adaptive selection method suitable for spherical microphone array sound source orientation
  • Spherical harmonic order self-adaptive selection method suitable for spherical microphone array sound source orientation

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[0073] The method of the invention has the effect of selecting reliable characteristic beams and reliable time-frequency points.

[0074] The selection of reliable order eigenbeams and reliable time-frequency points is the key technology of the present invention. For this reason, an example is given to illustrate the selection effect of reliable order eigenbeams and time-frequency points. Considering that the reverberation time is 400ms and the signal-to-noise ratio is 10dB, the real azimuth angles of the three sound sources are (θ 1 =80°,φ 1 =150°), (θ 2 =80°,φ 2 =180°) and (θ 3 =80°,φ 3 =210°), the two thresholds are set to η th =0.75,N th =2. Figure 2a is the spectrogram of the pure speech signal, Figure 2b is the spectrogram of the speech signal with noise added in the reverberation environment, Figure 2c The distribution of the time-frequency points of the selected second-order reliable eigenbeams is also the distribution of reliable time-frequency points, ac...

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Abstract

The invention discloses a spherical harmonic order self-adaptive selection method suitable for spherical microphone array sound source orientation, which comprises the following steps of: transformingthe sound field information from a time-frequency domain to a mode intensity compensation characteristic beam form of a spherical harmonic domain by means of discrete sphere Fourier transform and mode intensity compensation, and calculating the power of each order of characteristic beam of the sound field by each order of characteristic beam of the sound field; measuring the power similarity of the characteristic beams of all orders according to the characteristic beam power similarity detection factors among all orders of the sound field; performing reliable order selection processing on theaverage characteristic beam power similarity detection factor according to the set threshold parameter value; and masking the time frequency points according to the reliable order, and positioning the sound field by using reliable-order sound field characteristic beams corresponding to the time frequency points meeting the conditions to obtain an azimuth angle estimation value. The method has higher robustness to reverberation noise and higher sound source azimuth estimation precision.

Description

technical field [0001] The invention relates to a spherical microphone array, which is suitable for a sound source orientation method in a spherical harmonic domain, and can be used in many fields such as video conference systems, robot hearing, hearing aids, man-machine voice interaction systems, and audio monitoring. Background technique [0002] The spherical microphone array has three-dimensional spatial symmetry, has the same spatial resolution in the entire space, and can transform the collected sound field information into the spherical harmonic domain for representation, which has the advantage that the sound field information has nothing to do with the array distribution, which is Three-dimensional sound field analysis brings convenience. In recent years, some algorithms for sound source orientation in the spherical harmonic domain have been proposed, especially the algorithm for localization using eigenbeams compensated by mode intensity, such as PWD-SRP (see liter...

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Application Information

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IPC IPC(8): G01S3/86G01S3/802
CPCG01S3/802G01S3/86
Inventor 高伟霞陈华伟
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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