Estimation of the frequency dependent reverberation time by means of warped filter-banks

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...

• Type: Journal
• Year: 2011
• Where: ICASSP
• Authors: Heinrich W. Löllmann, Peter Vary
• Keywords: Estimation, Frequency Dependent Rt, ICASSP 2011, RT Estimation, Signal Processing