Noise suppression with synthesis windowing and pseudo noise injection

A noise suppression algorithm with synthesis windowing and pseudo noise injection is proposed. A synthesis window function is applied between inverse transform and overlap-add processing for smooth transition at frame boundaries. The pseudo noise injection modifies the spectral gain based on its nonlinearity. It is selectively disabled for stationary noise so that possible distortion is minimized. Evaluations including subjective assessment show that annoyable peaks of the background noise are suppressed by as much as 15 dB, resulting in a better MOS than that by the EVRC noise suppressor.