The characteristics of speech signal have caused the difficulty of speech recognition , these characteristics include changefulness , dynamism , instantance and continuity etc . the process of computer recognition for speech and the identification process for speech by a person are basically consistent 语音信号本身的特点造成了语音识别的困难，这些特点包括多变性、动态性、瞬时性和连续性等。计算机对语音识别的过程和人对语音的识别过程基本上一致。
