Computer Engineering and Applications ›› 2011, Vol. 47 ›› Issue (25): 140-142.

• 数据库、信号与信息处理 • Previous Articles     Next Articles

Algorithm of U/V decision without threshold and pitch detection

JIANG Zhancai,YAO Gang   

  1. Physics Department of Qinghai Normal University,Xining 810008,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2011-09-01 Published:2011-09-01

一种无门限U/V判决和基音检测算法

姜占才,姚 刚   

  1. 青海师范大学 物理系,西宁 810008

Abstract: A new algorithm for U/V decision without threshold and pitch detection is developed on the basis of studying the performance of pitch detection of Auto-Correlation Function(ACF) and Average Magnitude Difference Function(AMDF).This algorithm obtains the result of U/V decision and the pitch of voiced speech by means of calculating AMDF and ACF of residual signal of LPC(LACF),and comparing the pitch that each method obtains.This algorithm needs only one logical decision and there is no need to compare the threshold.The result of speech coding and decoding simulation,which uses this algorithm by many vocoder,indicates that the U/V decision and pitch detection have a high accuracy and strong noise robustness.

Key words: Unvoiced/Voiced(U/V) dicision, pitch detection, Auto-Correlation Function(ACF), Average Magnitude Difference Function(AMDF), threshold

摘要: 在实验研究自相关法(ACF)和平均幅度差法(AMDF)基音检测性能的基础上,提出了一种无门限清/浊音判决和基音检测算法。该算法对语音帧分别计算AMDF和LPC残差信号的自相关(LACF),比较两种方法所得的基音,得出清/浊音判决结果和浊音帧的基音周期。只用一次逻辑判断,无需比较门限;在多种声码器上应用该算法进行语音编/解码仿真实验,表明判决和检测算法具有较高的准确性和较强的噪声鲁棒性。

关键词: 清/浊音判决, 基音检测, 自相关, 平均幅度差, 门限