Apple Inc.
Joint spatial echo and noise suppression with adaptive suppression criteria

Abstract:

An aspect of this disclosure relates to noise and/or echo suppression for a device in which noise and echo suppression are adaptively determined as noise and echo change in an environment that surrounds the device. An aspect can use a skewed maximal ratio combining technique or a spatial filter with coefficients that are adaptively determined based on a perceptually selected target ratio that is compared to a ratio of sound energies/levels based on a pair of the coefficients. Another aspect relates to the use of information in one frequency band to perform additional noise and/or echo suppression in one or more adjacent frequency bands.