Electrical audio signal processing systems and devices – Including frequency control – Having crossover filter
Reexamination Certificate
2005-09-07
2010-11-02
Mei, Xu (Department: 2614)
Electrical audio signal processing systems and devices
Including frequency control
Having crossover filter
C381S103000, C381S097000, C381S001000, C381S100000, C333S132000, C333S02800T, C333S177000
Reexamination Certificate
active
07826626
ABSTRACT:
A system and method provide at least a single stage optimization process which maximizes the flatness of the net subwoofer and satellite speaker response in and around a cross-over region. A first stage determines an optimal cross-over frequency by minimizing an objective function in a region around the cross-over frequency. Such objective function measures the variation of the magnitude response in the cross-over region. An optional second stage applies all-pass filtering to reduce incoherent addition of signals from different speakers in the cross-over region. The all-pass filters are preferably included in signal processing for the satellite speakers, and provide a frequency dependent phase adjustment to reduce incoherency between the center and left and right speakers and the subwoofer. The all-pass filters are derived using a recursive adaptive algorithm.
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Bharitkar Sunil
Hilmes Philip
Kyriakakis Chris
Turner Andrew Dow
Audyssey Laboratories, Inc.
Fahnert Friedrich
Foley & Lardner LLP
Mei Xu
Moore Steven A.
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