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

Authors:

Heinrich W. Löllmann and Peter Vary

Book Title:

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

Venue:

Prague, Czech Republic

Event Date:

22.-27.5.2011

Organization:

IEEE

Location:

Piscataway, NJ, USA

Date:

May 2011

Pages:

309–312

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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