A scheme for pitch extraction of speech using autocorrelation function with frame length proportional to the time lag
A scheme for pitch extraction of speech using autocorrelation function with frame length proportional to the time lag
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DOI：
10.1109/icassp.1992.225950
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发表时间：
1992-03
期刊：
影响因子：
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通讯作者：
K. Hirose;H. Fujisaki;Shigenobu Seto
中科院分区：
文献类型：
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作者：
K. Hirose;H. Fujisaki;Shigenobu Seto
尽管基于短时自相关函数的基音提取方案对大多数语音信号提供了可靠的结果，但表示基本周期的自相关峰随帧位置而波动，导致偶尔的基音提取错误。为了减小这些误差，提出了一种采用归一化短时自相关函数新定义的方案。与传统定义相比，该定义的主要优点之一是帧长度与时延成比例变化，因此，可以在不知道说话者基频范围的情况下分析输入语音。提出了两种归一化方法，其中补偿波形短时功率变化的归一化方法效果较好。在工作站上构建了一个基音提取系统，并利用男女播音员的连通语音进行了实验，验证了所提方案的有效性
Although pitch extraction schemes based on the short-time autocorrelation function offer reliable results for most of the speech signal, the autocorrelation peaks indicating fundamental period fluctuate with frame position, causing occasional pitch extraction errors. In order to reduce these errors, a scheme using a new definition of normalized short-time autocorrelation function is proposed. One of the major advantages of the definition over conventional ones is that the frame length changes in proportion to the time lag, and, therefore, the input speech can be analyzed without any knowledge of the fundamental frequency range of the speaker. Two methods are proposed for the normalization, and the one compensating for variations of the short-time power of the waveform is shown to offer better results. A system for pitch extraction is constructed on a workstation, and the validity of the proposed scheme is demonstrated by experiments using the connected speech of male and female announcers.>