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A Multi-Channel Delay Estimation Method Based on Robust Adaptive Blind System Identification

A robust self-adaptive and time-delay estimation technology, applied in radio wave measurement systems, measurement devices, instruments, etc., can solve the problems of non-stationary speech and adverse effects on the accuracy of time-delay estimation of colored characteristics

Active Publication Date: 2018-05-29
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

However, the non-stationary and colored nature of speech still adversely affects the delay estimation accuracy in low signal-to-noise ratio (SNR) environments

Method used

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  • A Multi-Channel Delay Estimation Method Based on Robust Adaptive Blind System Identification
  • A Multi-Channel Delay Estimation Method Based on Robust Adaptive Blind System Identification
  • A Multi-Channel Delay Estimation Method Based on Robust Adaptive Blind System Identification

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Embodiment

[0216]In order to illustrate the technical effect of the present invention, a specific example is adopted to carry out experimental verification of the present invention, and its experimental effect is compared with four kinds of contrast algorithms, and four kinds of contrast algorithms are respectively: classic generalized cross-correlation-phase transformation method (GCC -PHAT) (see literature "Y.Huang, J.Benesty, and J.Chen, Acoustic MIMO Signal Processing. Berlin, Germany: Springer, 2006."), normalized multi-channel frequency-domain LMS algorithm (NMCFLMS) (see literature “J.Chen, Y.Huang, and J.Benesty, “An adaptive blind SIMO identification approach to joint multichannel time delay estimation,” in Proc.IEEEInt.Conf.Acoust., Speech, Signal Process.(ICASSP), 2004, pp .IV-53–IV-56."), Robust Normalized Multichannel Frequency-Domain LMS Algorithm (RNMCFLMS) (see literature "M.A.Haque and M.K.Hasan, "Noiserobust multichannel frequency-domain LMS algorithms for blind channel ...

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Abstract

The invention discloses a multichannel time delay estimation method based on robust adaptive blind system identification. An adaptive filter coefficient of a channel corresponding to each microphone is initialized; each microphone acquires sound signals and the sound signals are stored in separate frames; and by using the signal frames acquired by each microphone in the same time period, multichannel time delay estimation is carried out. Firstly, according to the time domain signals acquired by each microphone and the former-frame time domain signals, the adaptive filter coefficient according to the former-frame time domain signals and first-order and second-order derivatives of a Cauchy estimator, the updating amount of the adaptive filter coefficient is calculated, the updating amount is used for updating an adaptive filter coefficient acquired in previous iteration, the adaptive filter coefficient corresponding to the current frame is obtained, and the obtained adaptive filter coefficient is used for time delay estimation. The Cauchy estimator is used for defining a new frequency domain cost function, and the time delay estimation performance is enhanced.

Description

technical field [0001] The invention belongs to the technical field of sound source localization, and more specifically relates to a multi-channel time delay estimation method based on robust adaptive blind system identification. Background technique [0002] Delay estimation, whose purpose is to use the signals collected by the sensor array to estimate the arrival time difference between the sound source and the array, plays an important role in the sound source localization and tracking of hands-free voice communication. Many scholars have conducted extensive research on this topic and developed many time delay estimation methods, including the well-known generalized cross-correlation method, methods based on blind channel identification, multi-channel linear prediction methods, methods based on information theory, etc. [0003] In the delay estimation method, the literature "Y.Huang and J.Benesty, "A class of frequency-domain adaptive approaches to blind multichannel iden...

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Application Information

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IPC IPC(8): G01S5/20
CPCG01S5/20
Inventor 何宏森陈景东杨涛
Owner SOUTHWEAT UNIV OF SCI & TECH
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