关键词: 基音周期标准化, 语音识别, 嵌入式系统

Abstract: Based on the similarity of the sound wave in a pitch period when different speakers articulate the same syllables，a new pre-process method of speech signal，normalization of pitch period has been proposed in this paper.The new pre-process method has been applied in an embedded speech recognition system designed for speaker-independent isolated digitals recognition.The experiment proves that the use of normalization of pitch period can obviously increase the accuracy of the recognition rate.

Key words: normalization of pitch period, speech recognition, embedded system