A Low Complexity Noise Suppressor with Hybrid Filterbanks and Adaptive Time-Frequency Tiling

作者：Shimada Osamu^*; Sugiyama Akihiko; Nomura Toshiyuki

来源：IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences, 2010, E93A(1): 254-260.

DOI：10.1587/transfun.E93.A.254

• speech enhancement
• noise suppression
• low complexity
• hybrid filterbank
• adaptive time-frequency tiling

This paper proposes a low complexity noise suppressor with hybrid filterbanks and adaptive time-frequency tiling. An analysis hybrid filterbank provides efficient transformation by further decomposing low-frequency bins after a coarse transformation with a short frame size. A synthesis hybrid filterbank also reduces computational complexity in a similar fashion to the analysis hybrid filterbank. Adaptive time-frequency tiling reduces the number of spectral gain calculations. It adaptively generates tiling information in the time-frequency plane based on the signal characteristics. The average number of instructions on a typical DSP chip has been reduced by 30% to 7.5 MIPS in case of mono signals sampled at 44.1 kHz. A Subjective test result shows that the sound quality of the proposed method is comparable to that of the conventional one.

• 出版日期2010-1