System And Method For Automatic Multiple Listener Room Acoustic Correction With Low Filter Orders
First Claim
Patent Images
1. 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.
3 Assignments
0 Petitions
Accused Products
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.
156 Citations
16 Claims
-
1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. 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. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
Specification