System and method for automatic multiple listener room acoustic correction with low filter orders
AssigneeAudyssey Laboratories, Inc.
InventorsSunil Bharitkar, Chris Kyriakakis
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Abstract
A system and a method 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.
Claims19
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;
- warping each of the room acoustical response measured at said each listener position;
- determining a general response by computing a weighted average of the warped room acoustical responses;
- generating a low order spectral model of the general response;
- obtaining a warped acoustic correction filter from the low order spectral model, wherein the warped acoustic correction filter is the inverse of the low order spectral model;
- and
- unwarping the warped acoustic correction filter to obtain a room acoustic correction filter;
- wherein the room acoustic correction filter corrects the room acoustics at the multiple-listener positions.
A method for generating substantially distortion-free audio at multiple-listeners in an environment, the method comprising:
- measuring with a microphone acoustical characteristics of the environment at each expected listener position in the multiple-listener environment;
- warping each of the acoustical characteristics measured at said each expected listener position;
- generating a low order spectral model of each of the warped acoustical characteristics;
- obtaining a warped acoustic correction filter from the low order spectral model, wherein the warped acoustic correction filter is the inverse of the low order spectral model;
- unwarping the warped acoustic correction filter to obtain a room acoustic correction filter;
- filtering an audio signal with the room acoustical correction filter;
- and
- transmitting the filtered audio from at least one loudspeaker, wherein the audio signal received at said each expected listener position is substantially free of distortions.
A system for generating substantially distortion-free audio at multiple-listeners in an environment, the system comprising:
- a filtering means for performing multiple-listener room acoustic correction, the filtering means formed from:
- (i) warped room acoustical responses, wherein the room acoustical responses are measured with a microphone at each of an expected listener position in a multiple-listener environment;
- (ii) a weighted average response of the warped room acoustical responses;
- (iii) a low order spectral model of the weighted average response;
- (iv) a warped filter formed from the low order spectral model, wherein the warped filter is the inverse of the low order spectral model;
- and
- (v) an unwarped room acoustic correction filter obtained by unwarping the warped filter;
- wherein an audio signal, filtered by the filtering means comprised of the room acoustic correction filter, is received substantially distortion-free at each of the expected listener positions;
- and
- a means for transmitting the audio signal.
A method for correcting room acoustics at multiple-listener positions, the method comprising:
- warping each room acoustical response, said each room acoustical response obtained with a microphone at each expected listener position;
- clustering each of the warped room acoustical response into at least one cluster, wherein each cluster includes a centroid;
- forming a general response from the at least one centroid;
- inverting the general response to obtain an inverse response;
- obtaining a lower order spectral model of the inverse response;
- unwarping the lower order spectral model of the inverse response to form the room acoustic correction filter;
- wherein the room acoustic correction filter corrects the room acoustics at the multiple-listener positions.
Dependencies are inferred from the claim text.