Real-time audio source separation by delay and attenuation compensation in the time domain
First Claim
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1. A method for separating at least two audio channels recorded using an array of at least two microphones comprising the steps of:
- equalizing variances of a first channel and a second channel on a current data frame;
recursively expressing means and variances of mixtures;
normalizing the second channel to a variance level substantially similar to a variance of the first channel; and
determining delay parameters by minimizing a cross-covariance between two outputs.
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Abstract
A system is provided for separating two audio channels recorded by an array of microphones. The system includes a calibration module for normalizing gain levels between a plurality of channels on each of a plurality of date frames, wherein each data frame is expressed in terms of time. The system further includes a delay parameter estimation module for accepting an output comprising the normalized channels, and estimating a delay parameter for a plurality of data frame sizes over a plurality of lag times, and sorting delays to generate corresponding source separated outputs.
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Citations
15 Claims
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1. A method for separating at least two audio channels recorded using an array of at least two microphones comprising the steps of:
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equalizing variances of a first channel and a second channel on a current data frame; recursively expressing means and variances of mixtures; normalizing the second channel to a variance level substantially similar to a variance of the first channel; and determining delay parameters by minimizing a cross-covariance between two outputs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for separating at least two audio channels recorded using an array of at least two microphones comprising the steps of:
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constraining a mixing model of the at least two audio channels in a time domain to direct path signal components; defining a plurality of delays with respect to a midpoint between microphones, wherein delays depend on the distance between sensors and the speed of sound; inverting a mixing matrix, corresponding to the mixing model, in the frequency domain; and compensating for a plurality of true fractional delays and attenuations in the time domain, wherein values of the delays and attenuations are determined from an output decorrelation constraint. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A program storage device readable by machine, tangibly embodying a program of instructions executable by the machine to perform method steps for separating at least two audio channels recorded using an array of at least two microphones, the method steps comprising:
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equalizing variances of a first channel and a second channel on a current data frame; recursively expressing means and variances of mixtures; normalizing the second channel to a variance level substantially similar to a variance of the first channel; and
determining delay parameters by minimizing a cross-covariance between two outputs.
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Specification