***Cancelled due to Tube strike*** - Recovering some statistical information of Room Impulse

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• Guillaume Defrance, Institut de Mécanique Jean le Rond d'Alembert, Paris, France
• Wednesday 10 June 2009, 12:00-13:00
• Gabor Seminar Room.

If you have a question about this talk, please contact Danilo Mandic.

Unfortunately CANCELLED due to the Tube strike.
Is likely to be rescheduled soon.

Matching Pursuit, a well-known technique used in audio decomposition and sparse representation, is applied to Room Impulse Responses (RIRs) in order to investigate some statistical foundations of Room Acoustics. The detection of arrivals and the estimation of mixing time are therefore possible. This study is a first step towards a validation of the ergodic theory of reverberation. The use of Matching Pursuit is implicit since correlation between the impulse response and the direct sound is assumed. This presentation shows why the compensation of the energy decay of the RIR is necessary to obtain stationary signals, and also how to estimate the best temporal boundaries of the direct sound of the RIR . The choice of a stopping criteria, based on the similarity between acoustical indices of the original RIR and those of the reconstructed signal, is discussed. The cumulative distribution functions of arrivals of experimental and synthesized RIRs (using a stochastic model, which is presented) are compared. The mixing time is estimated when the arrival density becomes constant. The dependance of mixing time upon the distance source/receiver is investigated with measured and synthesized RIRs. It is shown how the integration of the diffusion to the model improves the match between mixing times of experimental and synthesized RIRs.

This talk is part of the COMMSP Seminar series.

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