Patent ID: 8489396
Filing Date: 2013-07-16
Classification: G10L

Abstract:
1. A method of identifying tonal noise comprising: transforming an input signal into a plurality of frequency bins; at each bin calculating a smoothed background noise and a background noise estimate; at each bin comparing the smoothed background noise to the background noise estimate; calculating a ratio of the background noise estimate to the smoothed background noise for a bin; comparing the ratio to a predetermined threshold value; identifying whether a peak in the bin is a tonal peak or a non-tonal noise peak based on the comparison between the ratio and the predetermined threshold value; identifying the bin as having the tonal peak in response to a determination that the ratio of the background noise estimate to the smoothed background noise is greater than the predetermined threshold value; and attenuating at least a portion of the tonal peak of the input signal to generate an output signal with reduced tonal noise.