Patent ID: 7912567
Filing Date: 2011-03-22
Classification: G10L

Abstract:
1. A method of determining noise in an audio stream, the method comprising: acquiring a plurality of consecutive time frames of the audio stream each comprising samples of the audio stream; generating a discrete frequency spectrum for each frame responsive to the frame samples; partitioning the frequency spectrum of each frame into a plurality of same frequency bands; determining an audio energy for each frequency band in each frame; and determining an estimate of noise energy for each frequency band in a temporally last time frame responsive to a relatively small number of smallest values for the audio energy in the frequency band of the plurality of time frames, wherein the relatively small number is determined responsive to an estimate of the Signal to Noise Ratio (SNR) of the band and a band-averaged SNR for the last frame, wherein determining the relatively small number comprises determining a larger number for frequency bands having a relatively small SNR.