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On microphone array beamforming and insights into the underlying signal models in the short-time-Fourier-transform domain.

Authors :
Pan C
Chen J
Shi G
Benesty J
Source :
The Journal of the Acoustical Society of America [J Acoust Soc Am] 2021 Jan; Vol. 149 (1), pp. 660.
Publication Year :
2021

Abstract

This paper studies signal models for microphone array beamforming in the short-time-Fourier-transform (STFT) domain with long acoustic impulse responses. The major contributions are as follows. First, the signal modeling problem is investigated in the STFT domain and a general decomposition is proposed for the convolved source signal. Second, new insights into the array manifold are presented: the STFT of the windowed acoustic impulse response from the source to the sensors. Third, the structure of the reference signal is analyzed: it can be viewed as the output of a beamformer without considering the noise in the observation signal. Fourth, based on the new perspectives and decomposition, a signal model is derived based on the use of the superdirective beamformer. Finally, three performance measures are defined, based on which three optimal/suboptimal signal models are derived and their performance is assessed under different acoustic environments and analysis window lengths. The performance of the well-known minimum variance distortionless response (MVDR) beamformer is evaluated, which justifies the properties of the developed signal models.

Details

Language :
English
ISSN :
1520-8524
Volume :
149
Issue :
1
Database :
MEDLINE
Journal :
The Journal of the Acoustical Society of America
Publication Type :
Academic Journal
Accession number :
33514160
Full Text :
https://doi.org/10.1121/10.0003335