title: One-against-all weighted dynamic time warping for language-independent and speaker-dependent speech recognition in adverse conditions.
abstract: Considering personal privacy and difficulty of obtaining training material for many seldom used English words and (often non-English) names, language-independent (LI) with lightweight speaker-dependent (SD) automatic speech recognition (ASR) is a promising option to solve the problem. The dynamic time warping (DTW) algorithm is the state-of-the-art algorithm for small foot-print SD ASR applications with limited storage space and small vocabulary, such as voice dialing on mobile devices, menu-driven recognition, and voice control on vehicles and robotics. Even though we have successfully developed two fast and accurate DTW variations for clean speech data, speech recognition for adverse conditions is still a big challenge. In order to improve recognition accuracy in noisy environment and bad recording conditions such as too high or low volume, we introduce a novel one-against-all weighted DTW (OAWDTW). This method defines a one-against-all index (OAI) for each time frame of training data and applies the OAIs to the core DTW process. Given two speech signals, OAWDTW tunes their final alignment score by using OAI in the DTW process. Our method achieves better accuracies than DTW and merge-weighted DTW (MWDTW), as 6.97% relative reduction of error rate (RRER) compared with DTW and 15.91% RRER compared with MWDTW are observed in our extensive experiments on one representative SD dataset of four speakers' recordings. To the best of our knowledge, OAWDTW approach is the first weighted DTW specially designed for speech data in adverse conditions.
authors: Science and Technology on Parallel and Distributed Processing Laboratory, School of Computer Science, National University of Defense Technology, Changsha, Hunan, China ; State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Fengtai District, Beijing, China ; David R. Cheriton School of Computer Science, University of Waterloo, Waterloo, Ontario, Canada.
authors: Xianglilan
authors: X
authors: Zhang
authors: Voice Enabling Systems Technology, Waterloo, Ontario, Canada.
authors: Jiping
authors: J
authors: Sun
authors: Science and Technology on Parallel and Distributed Processing Laboratory, School of Computer Science, National University of Defense Technology, Changsha, Hunan, China.
authors: Zhigang
authors: Z
authors: Luo
mesh_terms: D000465:Algorithms; D006801:Humans; D007802:Language; D012815:Signal Processing, Computer-Assisted; D013060:Speech / Q000502:physiology*; D049250:Speech Recognition Software