System and method for automatic multiple listener room acoustic correction with low filter orders
AssigneeAudyssey Laboratories, Inc.
InventorsSunil Bharitkar, Chris Kyriakakis
Life of this patent
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Abstract
A system and a methods for correcting, simultaneously at multiple-listener positions, distortions introduced by the acoustical characteristics includes warping room responses, intelligently weighing the warped room acoustical responses to form a weighted response, a low order spectral fitting to the weighted response, forming a warped filter from the low order spectral fit, and unwarping the warped filter to form the room acoustical correction filter.
Claims16
A method for correcting room acoustics at multiple-listener positions, the method comprising:
- measuring with a microphone a room acoustical response at each listener position in a multiple-listener environment;
- processing each of the room acoustical response measured at said each listener position to obtain non-uniform resolution of the room acoustical response in an audio frequency domain, wherein the non-uniform resolution results in higher resolution at low frequencies for each of the measured room acoustical response;
- determining a general response by computing a weighted average of the processed acoustical responses;
- generating a low order spectral model of the general response;
- obtaining an acoustic correction filter from the low order spectral model, wherein the acoustic correction filter is the inverse of the low order spectral model;
- and
- processing the acoustic correction filter to obtain a room acoustic correction filter with uniform resolution in the audio frequency domain;
- wherein the room acoustic correction filter corrects the room acoustics at the multiple-listener positions.
A method for correcting room acoustics at multiple-listener positions, the method comprising:
- measuring with a microphone a room acoustical response at each listener position in a multiple-listener environment;
- processing each of the room acoustical response measured at said each listener position to obtain non-uniform resolution of the room acoustical response in an audio frequency domain, wherein the non-uniform resolution results in higher resolution at low frequencies for each of the measured room acoustical response;
- obtaining minimum-phase response of each of the said processed acoustical responses;
- determining a general response by computing the weighted average of the minimum-phase processed responses;
- generating a low order spectral model of the general response;
- obtaining an acoustic correction filter from the low order spectral model;
- and
- processing the acoustic correction filter to obtain a room acoustic correction filter with uniform resolution in the audio frequency domain;
- wherein the room acoustic correction filter corrects the room acoustics at the multiple-listener positions.
Dependencies are inferred from the claim text.