An adaptive multichannel identification system for room response equalization

This paper deals with an adaptive multichannel and multiple position room response equalization system capable of improving the listening experience in a real environment. An adaptive and accurate estimation of the room responses is provided introducing a normalized least mean square optimization approach with a variable step-size, and taking advantage of a multichannel interchannel coherence reduction technique based on the missing fundamental phenomenon. Then, the equalizer is designed with the introduction of a new prototype function obtained by combining the impulse responses recorded in the real environment to be equalized with quasi-anechoic impulse responses. Several experiments have been performed in a real scenario comparing the proposed approach with the state of the art in terms of objective and subjective measures.

[1]  Francesco Piazza,et al.  A Mixed Decorrelation Approach for Stereo Acoustic Echo Cancellation Based on the Estimation of the Fundamental Frequency , 2012, IEEE Transactions on Audio, Speech, and Language Processing.

[2]  John Mourjopoulos,et al.  A comparative study of least-squares and homomorphic techniques for the inversion of mixed phase signals , 1982, ICASSP.

[3]  Francesco Piazza,et al.  An adaptive multiple position room response equalizer in warped domain , 2012, 2012 Proceedings of the 20th European Signal Processing Conference (EUSIPCO).

[4]  Francesco Piazza,et al.  A novel decorrelation approach for multichannel system identification , 2014, 2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP).

[5]  Francesco Piazza,et al.  Automotive Audio Equalization , 2009 .

[6]  John Mourjopoulos,et al.  Errors in Real-Time Room Acoustics Dereverberation* , 2004 .

[7]  A. W. M. van den Enden,et al.  Discrete Time Signal Processing , 1989 .

[8]  Francesco Piazza,et al.  Multiple Position Room Response Equalization in Frequency Domain , 2012, IEEE Transactions on Audio, Speech, and Language Processing.

[9]  John Worley,et al.  Subjective Assessments of Real-Time Room Dereverberation and Loudspeaker Equalization , 2005 .

[10]  J. Shynk.  Frequency-domain and multirate adaptive filtering , 1992, IEEE Signal Processing Magazine.

[11]  Francesco Piazza,et al.  A Novel Approach for Prototype Extraction in a Multipoint Equalization Procedure , 2014 .

[12]  Balázs Bank.  Combined Quasi-Anechoic and In-Room Equalization of Loudspeaker Responses , 2013 .

[13]  John Mourjopoulos.  On the variation and invertibility of room impulse response functions , 1985 .

[14]  Jont B. Allen,et al.  Invertibility of a room impulse response , 1979 .

[15]  Hugo Fastl,et al.  Psychoacoustics: Facts and Models , 1990 .

[16]  Francesco Piazza,et al.  A multichannel and multiple position adaptive room response equalizer in warped domain , 2013, 2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA).

[17]  Hareo Hamada,et al.  Fast deconvolution of multichannel systems using regularization , 1998, IEEE Trans. Speech Audio Process..

[18]  Young-Cheol Park,et al.  Effective bass enhancement using second-order adaptive notch filter , 2008, IEEE Transactions on Consumer Electronics.

[19]  Aníbal Ferreira,et al.  An Improved Adaptive Room Equalization in the Frequency Domain , 2005 .

[20]  Alberto González,et al.  A biased multichannel adaptive algorithm for room equalization , 2012, 2012 Proceedings of the 20th European Signal Processing Conference (EUSIPCO).

[21]  Sunil Bharitkar,et al.  Immersive Audio Signal Processing , 2006 .

[22]  John Mourjopoulos,et al.  Addendum to 'Generalized Fractional-Octave Smoothing of Audio and Acoustic Responses' , 2000 .

[23]  Francesco Piazza,et al.  An adaptive multiple position room response equalizer , 2011, 2011 19th European Signal Processing Conference.

[24]  Jacob Benesty,et al.  A better understanding and an improved solution to the specific problems of stereophonic acoustic echo cancellation , 1998, IEEE Trans. Speech Audio Process..

[25]  Murtaza Ali,et al.  Stereophonic acoustic echo cancellation system using time-varying all-pass filtering for signal decorrelation , 1998, Proceedings of the 1998 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP '98 (Cat. No.98CH36181).

[26]  Jacob Benesty,et al.  Springer handbook of speech processing , 2007, Springer Handbooks.

[27]  Francesco Piazza,et al.  A multichannel and multiple position adaptive room response equalizer in warped domain: Real-time implementation and performance evaluation , 2014 .

[28]  Philip A. Nelson,et al.  Multiple-Point Equalization in a Room Using Adaptive Digital Filters , 1989 .