Extract a waveform from a semi-periodic signal Wavetabling-Extract a waveform from a semi-periodic signal Wavetabling

提取淹没在噪声中的周期信号要求自相关（以判断周期）和互相关（以恢复信号自身）-Extraction drowned in the noise requirements of a periodic signal autocorrelation (to determine the cycle) and cross-correlation (to restore the signal itself)