Title :
Maximum a posteriori estimation of room impulse responses
Author :
Florencio, Dinei ; Zhang, Zhengyou
Author_Institution :
Microsoft Res., Redmond, WA, USA
Abstract :
Estimating room impulse responses (RIRs) has a number of applications, including personalized audio, analyzing and improving acoustic behavior of concert halls, listening room compensation, sound source localization, and many others. RIRs have been estimated in essentially the same fashion for the last 50 years: Compute the cross correlation between a signal played at point A, and the signal received at point B. Best results are obtained when the signal played is white noise, or a maximum length sequence. No prior knowledge is exploited in computing the RIR, which is simply assumed to be the cross correlation between played and received signals. In contrast, research in adaptive RIR estimation (a.k.a. adaptive Acoustic Echo Cancellation) has made huge progress by (among other things) incorporating models for the RIR. In this paper we propose a new RIR estimation technique, based on a maximum a posteriori formulation. More specifically, we estimate the room reverberation time, as well as the room noise level, and use those as priors for the RIR estimation. Comparison with ground truth shows an average improvement of 12 dB compared to traditional methods.
Keywords :
acoustic noise; acoustic signal processing; architectural acoustics; correlation methods; echo suppression; maximum likelihood estimation; transient response; white noise; adaptive RIR estimation; adaptive acoustic echo cancellation; concert hall acoustic behavior analysis; concert hall acoustic behavior improvement; cross correlation computation; listening room compensation; maximum length sequence; maximum-a-posteriori estimation; personalized audio; played signals; received signals; room acoustics; room impulse response estimation; room noise level; sound source localization; white noise; Art; Estimation; Logic gates; Signal to noise ratio; Training; White noise; AEC; RIR; echo cancellation; room acoustics; room impulse response;
Conference_Titel :
Acoustics, Speech and Signal Processing (ICASSP), 2015 IEEE International Conference on
Conference_Location :
South Brisbane, QLD
DOI :
10.1109/ICASSP.2015.7178065