语音信号相空间重构中时间延迟的选择──复自相关法

Selection of Proper Time-Delay in Phase Space Reconstruction of Speech Signals

时间序列空间重构中，时间延迟参数的选择具有重要意义。本文在分析求时间延迟的自相关法和平均位移法基础上，推导出较好的求时间延迟的方法，即复自相关法。复自相关法具有强的理论依据，其计算复杂度不大，对数据长度的依赖性不强，具有优秀的抗噪能力。应用于语音信号相空间重构的实验表明，其度量可得到合适的时间延迟。

In phase spare reconstruction of time sequences, the selection of the delay is important. Based on the analysis of Autocorrelation and Average Displacement (AD) method, this paper deduces a new meth od - Multiple - autocorrelation - to get a better criterion for proper time delay selection, which has a sound theo retic basis and could had to better effect.