Implementation of a Multipurpose Noise Suppressor Based on a Novel Scalable Framework

This paper presents implementation of a multipurpose noise suppressor based on a novel scalable framework for a wide range of applications. Spectral-gain calculation incorporates adaptive control of a spectral-gain floor for an appropriate balance between residual noise and distortion in the enhanced speech. Use of a common spectral gain among channels calculated from a down-mix signal helps reduce computations on gain calculation compared to independent spectral-gain calculation. Subjective evaluation results demonstrate that the difference in the 5-grade mean opinion score with and without the multipurpose noise suppressor in the downlink is improved by as much as 0.5. When it is used as an uplink noise suppressor, the enhanced-speech quality is statistically better than or equal to that with a conventional noise suppressor. Sampling rate vs. MIPS for monaural and stereo implementations, clock rate vs. current, frame size/delay vs. MIPS based on TMS320V5510 are also presented.