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将2khz-5khz中某一个频率的方波经过滤波器后变成对应频率的正弦波 ~比如输入一个2.6k的方波，输出一个2.6khz的正弦波~~是要设计成什么滤波器呢，具体参数怎么设置
亲；最理想的方式是用锁相256～1024倍频，然后用倍频信号读取写在ROM中的正弦信号即可
