Patent ID: 7426464
Filing Date: 2008-09-16
Classification: G10L

Abstract:
1. A method for reducing noise and interference for speech communication and speech recognition in an apparatus having a digital processing means for processing audio signals received in time domain from a plurality of microphones, said digital processing means comprising a first adaptive filter for enhancing a target signal in the audio signals and a second adaptive filter for reducing a non-target signal in the audio signals and an adaptive interference and noise suppression processor, said method comprising the steps: a) initializing and estimating parameters, said step comprising: b) determining direction of arrival of signal, testing for presence of target signal and processing by the first adaptive filter; c) rechecking signal from the first adaptive filter and reconfirming updated filter coefficients; d) testing for undesired signal, interference, and noise; and transforming these signals into the frequency domain; e) processing by the second adaptive filter and wrapping into Bark scale; and f) detecting and recovering unvoice signal, processing by adaptive interference and noise suppressor and high frequency recovery.