This delay can cause "comb filtering" (phase cancellation and addition), which alters the miked signal's tone.
这些延迟会造成“梳状滤波效应”(相位的抵消和叠加),这会改变拾取信号的音质。
2
With the signal frequency known, the filter with a given frequency delay is designed for an image target detection. The experiment proves that the filtering effect is good.