A multichannel and multiple position adaptive room response equalizer in warped domain

An adaptive multichannel and multiple position room response equalization system is proposed. The room responses are adaptively estimated with good accuracy by reducing the interchannel coherence with a technique based on the missing fundamental phenomenon, that introduces only a mild alteration of the sound timbre. The equalizer is designed in warp frequency domain for improving equalization in the low frequency region, reducing the computational cost of the design and deriving an algorithm capable to work in real time. Simulation results using signals acquired in a real environment illustrate the effectiveness of the proposed approach.

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

[2]  A. Oppenheim,et al.  Computation of spectra with unequal resolution using the fast Fourier transform , 1971 .

[3]  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.

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

[5]  Stefania Cecchi,et al.  NU-Tech: The Entry Tool of the HArtes Toolchain for Algorithms Design , 2008 .

[6]  Francesco Piazza,et al.  Low-complexity implementation of a real-time decorrelation algorithm for stereophonic acoustic echo cancellation , 2012, Signal Process..

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

[8]  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..

[9]  Rodney A. Kennedy,et al.  Nonminimum-phase equalization and its subjective importance in room acoustics , 2000, IEEE Trans. Speech Audio Process..

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

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

[12]  F. Piazza,et al.  Multipoint room response equalization with group delay compensation: Subjective listening tests , 2011, 2011 7th International Symposium on Image and Signal Processing and Analysis (ISPA).

[13]  F. Piazza,et al.  Multipoint equalization of digital car audio systems , 2009, 2009 Proceedings of 6th International Symposium on Image and Signal Processing and Analysis.

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

[15]  Ana Paula Rocha,et al.  Adaptive Audio Equalization of Rooms Based on a Technique of Transparent Insertion of Acoustic Probe Signals , 2006 .

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

[17]  Martin Schneider,et al.  Adaptive listening room equalization using a scalable filtering structure in thewave domain , 2012, 2012 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP).

[18]  Anders Ahlén,et al.  Spatially Robust Audio Compensation Based on SIMO Feedforward Control , 2009, IEEE Transactions on Signal Processing.

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

[20]  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).

[21]  Sascha Spors,et al.  Active listening room compensation for massive multichannel sound reproduction systems using wave-domain adaptive filtering. , 2007, The Journal of the Acoustical Society of America.

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

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

[24]  Francesco Piazza,et al.  Linear Phase Mixed FIR/IIR Crossover Networks: Design and Real-Time Implementation , 2007 .

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