说明：  音频处理中合唱效果的实现，通过将输入信号分为两路，一路直接输入，一路延迟，最终叠加，实现合唱效果。
(The effect of the realization of the audio processing in the chorus, the input signal is divided into two, all the way to direct input, all the way to delay final superposition chorus effect.)