ABSTRACT Decorrelation is a well known issue in the context of Stereophonic Acoustic Echo Cancellation: it is related to the problem of uniquely identifying each pair of room acoustic paths, due to high inter- channel coherence. In this paper, a novel approach to decorrelate a stereo signal based on the missing fundamental phenomenon is proposed. An adaptive algorithm is employed to track the behavior of one of the two channels, ensuring a continuous decorrelation without affecting the stereo quality. Several results are presented comparing our approach with Masked Noise injection method in terms of Magnitude Square Coherence, Itakura Saito measure and Convergence Speed of adaptive filters in order to confirm the validity of the proposed approach. Il prodotto, pubblicato negli atti della conferenza annuale IEEE Acoustics Speech and Signal Processing (ICASSP) molto nota e stimata nell’ambito della teoria dei circuiti a tempo discreto (DSP), contiene una proposta innovativa per la realizzazione di circuiti per la decorrelazione audio con particolare riferimento all’applicazione alla cancellazione d’eco in sistemi multicanale. Il lavoro è stato successivamente pubblicato in [1] ed è alla base anche delle ulteriori pubblicazioni [2] e [3]. [1] Cecchi, S.; Romoli, L.; Peretti, P.; Piazza, F., “A Combined Psychoacoustic Approach for Stereo Acoustic Echo Cancellation”, IEEE Transaction on Audio, Speech, and Language processing, Vol. 19, no. 6, Aug 2011, Pages: 1530-1539. [2] Cecchi, S.; Romoli, L.; Peretti, P.; Piazza, F., “A Mixed Decorrelation Approach for Stereo Acoustic Echo Cancellation Based on the Estimation of the Fundamental Frequency ”, IEEE Transaction on Audio, Speech, and Language processing, Vol. 20, no. 2, Feb 2012, Pages: 690-698. [3] Cecchi, S.; Romoli, L.; Peretti, P.; Piazza, F., “Low-complexity implementation of a real-time decorrelation algorithm for stereophonic acoustic echo cancellation”, in pubblicazione su Signal Processing, editore Elsevier (già disponibile on-line sul sito dell’editore).
A novel approach to channel decorrelation for stereo acoustic echo cancellation based on missing fundamental theory / Romoli, Laura; Cecchi, Stefania; Palestini, L; Peretti, Paolo; Piazza, Francesco. - (2010).
A novel approach to channel decorrelation for stereo acoustic echo cancellation based on missing fundamental theory
ROMOLI, LAURA;CECCHI, STEFANIA;PERETTI, PAOLO;PIAZZA, Francesco
2010-01-01
Abstract
ABSTRACT Decorrelation is a well known issue in the context of Stereophonic Acoustic Echo Cancellation: it is related to the problem of uniquely identifying each pair of room acoustic paths, due to high inter- channel coherence. In this paper, a novel approach to decorrelate a stereo signal based on the missing fundamental phenomenon is proposed. An adaptive algorithm is employed to track the behavior of one of the two channels, ensuring a continuous decorrelation without affecting the stereo quality. Several results are presented comparing our approach with Masked Noise injection method in terms of Magnitude Square Coherence, Itakura Saito measure and Convergence Speed of adaptive filters in order to confirm the validity of the proposed approach. Il prodotto, pubblicato negli atti della conferenza annuale IEEE Acoustics Speech and Signal Processing (ICASSP) molto nota e stimata nell’ambito della teoria dei circuiti a tempo discreto (DSP), contiene una proposta innovativa per la realizzazione di circuiti per la decorrelazione audio con particolare riferimento all’applicazione alla cancellazione d’eco in sistemi multicanale. Il lavoro è stato successivamente pubblicato in [1] ed è alla base anche delle ulteriori pubblicazioni [2] e [3]. [1] Cecchi, S.; Romoli, L.; Peretti, P.; Piazza, F., “A Combined Psychoacoustic Approach for Stereo Acoustic Echo Cancellation”, IEEE Transaction on Audio, Speech, and Language processing, Vol. 19, no. 6, Aug 2011, Pages: 1530-1539. [2] Cecchi, S.; Romoli, L.; Peretti, P.; Piazza, F., “A Mixed Decorrelation Approach for Stereo Acoustic Echo Cancellation Based on the Estimation of the Fundamental Frequency ”, IEEE Transaction on Audio, Speech, and Language processing, Vol. 20, no. 2, Feb 2012, Pages: 690-698. [3] Cecchi, S.; Romoli, L.; Peretti, P.; Piazza, F., “Low-complexity implementation of a real-time decorrelation algorithm for stereophonic acoustic echo cancellation”, in pubblicazione su Signal Processing, editore Elsevier (già disponibile on-line sul sito dell’editore).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
