Robust loudspeaker equalization based on position-independent excess phase modeling
2008 (English)In: 2008 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING, VOLS 1-12, 2008, 385-388 p.Conference paper (Refereed)
A well known problem in loudspeaker equalization is that mixed phase design of the inverse filter causes residual "pre-ringings" in the equalized system, due to the spatial variability of loudspeakerroom transfer functions. A common strategy for robust and perceptually acceptable equalization is therefore to use minimum phase filters only. In this paper, a method for cautious mixed phase equalization is proposed. By analysis of a set of room transfer functions, it is concluded that some non-minimum phase zeros are insensitive to receiver position, and can therefore be robustly inverted. The method improves upon a minimum phase equalization by extending the minimum phase model with a robustly invertible all pass link. Validation measurements show that the time-domain aspect of equalization is improved throughout the spatial region of interest, while preringings are kept at a very low and prespecified level.
Place, publisher, year, edition, pages
2008. 385-388 p.
, International Conference on Acoustics Speech and Signal Processing (ICASSP), ISSN 1520-6149
loudspeaker equalization, robustness, all-pass excess phase, acoustic signal processing
Research subject Signal Processing
IdentifiersURN: urn:nbn:se:uu:diva-111055ISI: 000257456700097ISBN: 978-1-4244-1483-3OAI: oai:DiVA.org:uu-111055DiVA: diva2:279245
33rd IEEE International Conference on Acoustics, Speech and Signal Processing Las Vegas, NV, MAR 30-APR 04, 2008