Patent ID: 7158933

Claim:
A method for filtering noise from an audio signal, comprising the steps of: obtaining a multi-channel recording of an audio signal contained in input channels; determining a psychoacoustic masking threshold for the audio signal; determining a noise spectral power matrix for the audio signal; determining parameters of a filter for filtering noise from the audio signal using the multi-channel recording, wherein the filter parameters are determined using the determined psychoacoustic masking threshold and using the determined noise spectral power matrix; filtering the multi-channel recording using the filter having the determined parameters to generate an enhanced audio signal; and determining a calibration parameter for the input channels, wherein the calibration parameter comprises a ratio of the impulse responses of different channels, and wherein the calibration parameter is used to determine the filter parameters, wherein the step of determining the calibration parameter comprises processing channel noise recorded in the different channels to determine a long-term spectral covariance matrix, and determining an eigenvector of the long-term spectral covariance matrix corresponding to a desired eigenvalue.