title: Noise Perturbation for Supervised Speech Separation.
abstract: Speech separation can be treated as a mask estimation problem, where interference-dominant portions are masked in a time-frequency representation of noisy speech. In supervised speech separation, a classifier is typically trained on a mixture set of speech and noise. It is important to efficiently utilize limited training data to make the classifier generalize well. When target speech is severely interfered by a nonstationary noise, a classifier tends to mistake noise patterns for speech patterns. Expansion of a noise through proper perturbation during training helps to expose the classifier to a broader variety of noisy conditions, and hence may lead to better separation performance. This study examines three noise perturbations on supervised speech separation: noise rate, vocal tract length, and frequency perturbation at low signal-to-noise ratios (SNRs). The speech separation performance is evaluated in terms of classification accuracy, hit minus false-alarm rate and short-time objective intelligibility (STOI). The experimental results show that frequency perturbation is the best among the three perturbations in terms of speech separation. In particular, the results show that frequency perturbation is effective in reducing the error of misclassifying a noise pattern as a speech pattern.
authors.affiliation: Department of Computer Science and Engineering, The Ohio State University, Columbus, Ohio 43210.
authors.forename: Jitong
authors.initials: J
authors.lastname: Chen
authors.affiliation: Department of Computer Science and Engineering, The Ohio State University, Columbus, Ohio 43210.
authors.forename: Yuxuan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Computer Science and Engineering, The Ohio State University, Columbus, Ohio 43210; Center for Cognitive and Brain Sciences, The Ohio State University, Columbus, Ohio 43210.
authors.forename: DeLiang
authors.initials: D
authors.lastname: Wang
keywords: Speech separation; noise perturbation; supervised learning