Audyssey Laboratories, Inc.

Andrew Dow Turner

Chris Kyriakakis

Sunil Bharitkar

Philip Hilmes

Tomlinson M Holman

Tyson Osborne Yaberg

Brad Babineaux

Merrick Mosst

Ted White

Michael Solomon

Alex Rasmussen

A spectral response shifting method allows a listener to shift a system response to match their preferences. The method includes a lookup table of coefficients for a number of Infinite Impulse Response (IIR) filter or Finite Impulse Response (FIR) filter which are selected by the listener to shift the response either toward bass or towards treble. In one embodiment, 5order IIR biquads filters are used at &#xbd; dB increments from &#x2212;6 dB to +6 dB. For example, when a listener selects the 'more treble by 1 dB' setting, a set of coefficients is loaded providing &#x2212;1 dB in bass cut at the lowest frequency of the audible spectrum (20 Hz) and +1 dB of treble boost at the highest frequency of the audible spectrum (20 kHz). The frequency response at all other points is defined by interpolating between the highest frequency (20 kHz) and the lowest frequency (20 Hz).

Operator adjustable full-bandwidth audio spectral shifting control with a simple listener interface

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.

Cross-over frequency selection and optimization of response around cross-over

Personal audio docking station

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Los Angeles, CA, United States of America

Andrew Dow Turner