title: An algorithm that improves speech intelligibility in noise for normal-hearing listeners.
abstract: Traditional noise-suppression algorithms have been shown to improve speech quality, but not speech intelligibility. Motivated by prior intelligibility studies of speech synthesized using the ideal binary mask, an algorithm is proposed that decomposes the input signal into time-frequency (T-F) units and makes binary decisions, based on a Bayesian classifier, as to whether each T-F unit is dominated by the target or the masker. Speech corrupted at low signal-to-noise ratio (SNR) levels (-5 and 0 dB) using different types of maskers is synthesized by this algorithm and presented to normal-hearing listeners for identification. Results indicated substantial improvements in intelligibility (over 60% points in -5 dB babble) over that attained by human listeners with unprocessed stimuli. The findings from this study suggest that algorithms that can estimate reliably the SNR in each T-F unit can improve speech intelligibility.
authors.affiliation: Department of Electrical Engineering, University of Texas at Dallas, Richardson, TX 75080, USA.
authors.forename: Gibak
authors.initials: G
authors.lastname: Kim
authors.forename: Yang
authors.initials: Y
authors.lastname: Lu
authors.forename: Yi
authors.initials: Y
authors.lastname: Hu
authors.forename: Philipos C
authors.initials: PC
authors.lastname: Loizou
mesh_terms: D000161:Acoustic Stimulation; D000465:Algorithms; D001185:Artificial Intelligence; D001499:Bayes Theorem; D019992:Databases as Topic; D005260:Female; D006801:Humans; D008297:Male; D009622:Noise; D046709:Pattern Recognition, Physiological; D010470:Perceptual Masking; D011571:Psychoacoustics; D013018:Sound Spectrography; D013060:Speech; D013065:Speech Intelligibility; D013067:Speech Perception