Imperial College London

Dr Patrick A. Naylor

Faculty of EngineeringDepartment of Electrical and Electronic Engineering

Professor of Speech & Acoustic Signal Processing
 
 
 
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Contact

 

+44 (0)20 7594 6235p.naylor Website

 
 
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Location

 

803Electrical EngineeringSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Moore:2019:10.1109/TASLP.2018.2882307,
author = {Moore, A and Xue, W and Naylor, P and Brookes, D},
doi = {10.1109/TASLP.2018.2882307},
journal = {IEEE Transactions on Audio, Speech and Language Processing},
pages = {519--530},
title = {Noise covariance matrix estimation for rotating microphone arrays},
url = {http://dx.doi.org/10.1109/TASLP.2018.2882307},
volume = {27},
year = {2019}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - The noise covariance matrix computed between the signals from a microphone array is used in the design of spatial filters and beamformers with applications in noise suppression and dereverberation. This paper specifically addresses the problem of estimating the covariance matrix associated with a noise field when the array is rotating during desired source activity, as is common in head-mounted arrays. We propose a parametric model that leads to an analytical expression for the microphone signal covariance as a function of the array orientation and array manifold. An algorithm for estimating the model parameters during noise-only segments is proposed and the performance shown to be improved, rather than degraded, by array rotation. The stored model parameters can then be used to update the covariance matrix to account for the effects of any array rotation that occurs when the desired source is active. The proposed method is evaluated in terms of the Frobenius norm of the error in the estimated covariance matrix and of the noise reduction performance of a minimum variance distortionless response beamformer. In simulation experiments the proposed method achieves 18 dB lower error in the estimated noise covariance matrix than a conventional recursive averaging approach and results in noise reduction which is within 0.05 dB of an oracle beamformer using the ground truth noise covariance matrix.
AU - Moore,A
AU - Xue,W
AU - Naylor,P
AU - Brookes,D
DO - 10.1109/TASLP.2018.2882307
EP - 530
PY - 2019///
SN - 1558-7916
SP - 519
TI - Noise covariance matrix estimation for rotating microphone arrays
T2 - IEEE Transactions on Audio, Speech and Language Processing
UR - http://dx.doi.org/10.1109/TASLP.2018.2882307
UR - http://hdl.handle.net/10044/1/66411
VL - 27
ER -