Research and implementation of parallel speech recognition based on HTK
基于HTK的语音识别的并行化研究与实现

After comprehensively analyzing the process of speech recognition and depicting its corresponding algorithm, the feasibility of the parallelism in the algorithm was analyzed. The parallel computing concept and the multi-threading technology were applied in the algorithm of speech recognition, and a protection mechanism was introduced to avoid the occurring race condition during the computing of likelihood of Hidden Markov Model (HMM) on multi-core computer. Then the parallel algorithm for speech recognition was proposed and its performance was also evaluated. The experiments on WSJ0 corpora demonstrate that the implementation of parallel algorithm which was realized in HTK 3.4 toolkit can greatly improve the real-time performance of speech recognition without affecting the results of recognition.