Estimation of the Frequency Dependent Reverberation Time by Means of Warped Filter-Banks

Authors:

Löllmann, H. W. ,  Vary, P.

Book Title:

Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

Organization:

IEEE

Pages:

p.p. 309-312

Address:

Prague, Czech Republic

Date:

May. 2011

ISBN:

978-1-45770-539-7

Language:

English

Abstract

An improved approach for the estimation of the frequency dependent
reverberation time (RT) by means of allpass transformed filterbanks
is presented. It is shown that by means of these warped filterbanks,
a much more accurate RT estimation at lower frequencies
can be obtained than by octave filter-banks, which are commonly
used for the estimation of the frequency dependent RT. Furthermore,
allpass transformed filter-banks can achieve a much better approximation
of the non-uniform frequency resolution of the human auditory
system than octave filter-banks. A uniform or non-uniform
(auditory) frequency resolution can thereby be simply adjusted by a
single allpass coefficient.
The RT estimation can be done with an allpass transformed DFT or
DCT filter-bank. The warped DCT filter-bank is of special interest
as it provides real-valued subband signals. This facilitates the use of
a maximum-likelihood (ML) estimator for either a non-blind estimation
of the frequency dependent RT from a room impulse response
or a blind estimation from a reverberant speech signal.

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