Patent ID: 9467775
Filing Date: 2016-10-11
CPC Classification: G10L,H04R

Claim Text:
1. A method of noise suppressing an audio signal in a headset having a plurality of microphones proximate a user's mouth, comprising a combination of at least two audio system input signals each having a sound source signal portion and a background noise portion, the method comprising steps of: a) capturing sound from a plurality of microphones, with at least a first microphone being proximate a user's mouth and a second microphone being more distant from a user's mouth than the first microphone, b) extracting at least two different types of spatial sound field features from the input signals, such as discriminative speech and/or background noise features, c) computing a first intermediate spatial noise suppression gain on the basis of the extracted spatial sound field features, d) computing a second intermediate stationary noise suppression gain, e) combining by addition, the two intermediate noise suppression gains to form a sum total noise suppression gain, wherein the two intermediate noise suppression gains are combined by comparing their values and dependent on their ratio or relative difference, determining the sum total noise suppression gain, wherein each of the intermediate noise suppression gains is non-zero; f) applying the total noise suppression gain to the audio signal to generate a noise suppressed audio system output signal.