A Low-Complexity Noise Suppressor with Nonuniform Subbands and a Frequency-Domain Highpass Filter
Masashi Kato, Akihiko K. Sugiyama · 2006
This paper proposes a low-complexity noise suppressor with nonuniform subbands and a frequency-domain highpass filter. A highpass filter to suppress undesirable low frequency components in the input signal is replaced with a simple DC offset canceler in the time-domain combined with a frequency-domain weighting function. Frequency bins after Fourier transform are nonuniformly grouped to reduce the computations for calculating the spectral gain. A new decomposition pattern is developed for higher quality of the enhanced speech. The number of operations on typical DSP chips is 3.2 MIPS that is approximately 50% off the conventional load. Subjective evaluation results demonstrates that the low-complexity noise suppressor achieves comparable quality of the enhanced speech to that of the conventional noise suppressor