Computer Engineering and Applications ›› 2007, Vol. 43 ›› Issue (13): 194-196.

• 数据库与信息处理 • Previous Articles     Next Articles

On Chip Realization of Speaker-independent isolated word speech recognizer

  

  • Received:2006-05-31 Revised:1900-01-01 Online:2007-05-01 Published:2007-05-01

非特定人孤立词语音识别系统的片上实现

张晨燕 孙成立   

  1. 石家庄经济学院信息工程学院 石家庄经济学院
  • 通讯作者: 张晨燕

Abstract: An embedded Speaker-independent isolated word speech recognition system is designed and realized in the SEED-DEC5502 EVM platform. Compared with the Speaker-dependent system, the Speaker-independent recognition technique cannot requires training by the users and easy to use. With the help of a modified real time voice activity detection algorithm(VAD) based on the log-energy acceleration associated with voice onset, we only perform Feature Extraction to the active voice and decrease the frames of processing.To further decrease the computational loads,A modified decoding strategy based on the share the uint states emission probabilities (SUSEP)is also presented. Test on 100 words vocabulary shows that system provides a recognition accuracy rate of 98. 1% using only 1.03 times of real time .

Key words: speech recognition, embedded system, speech endpoint detect, emission probabilities

摘要: 在SEED-DEC5502DSP嵌入式系统开发平台上实现了一个面向非特定人的孤立词语音识别系统,和传统的基于特定人的语音识别系统相比,该系统无需用户训练,易于使用。系统采用改进的基于语音对数域能量变化率的实时端点检测算法,只对检测的有声段语音进行特征提取,从而减少了要处理的语音帧数;提出了改进的共享声学单元状态发射概率共享的解码策略,进一步降低了计算负担。实验表明系统在100词条的情况下识别率达到98.1%,识别时间为1.03倍实时。

关键词: 语音识别 嵌入式系统 端点检测 发射概率