Inventi Impact: Audio, Speech & Music Processing
AN IMPROVED ADAPTIVE GAIN EQUALIZER FOR NOISE REDUCTION WITH LOW SPEECH DISTORTION
Markus Borgh, Magnus Berggren, Christian Schüldt, Fredric Lindström, Ingvar Claesson
In high-quality conferencing systems, it is desired to perform noise reduction with as limited speech distortion as
possible. Previous work, based on time varying amplification controlled by signal-to-noise ratio estimation in
different frequency subbands, has shown promising results in this regard but can suffer from problems in
situations with intense continuous speech. Further, the amount of noise reduction cannot exceed a certain level in
order to avoid artifacts. This paper establishes the problems and proposes several improvements. The improved
algorithm is evaluated with several different noise characteristics, and the results show that the algorithm provides
even less speech distortion, better performance in a multi-speaker environment and improved noise suppression
when speech is absent compared with previous work.
CC Compliant Citation: Borgh et al.: An improved adaptive gain equalizer for noise reduction with low speech distortion. EURASIP
Journal on Audio, Speech, and Music Processing 2011 2011:7. doi:10.1186/1687-4722-2011-7.