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全通滤波器的设计

大家好,

1、最近需要处理 声音信号的延时,然后打算就全通滤波器 搭建一个ns-ms级别的延时电路。但是网上没找到全通滤波器的设计过程,谁能给个资料不?
2、全通滤波器用于声音信号的延时,其中的运放选择需要注意哪些参数?