Description: * the FIR filter is implemented with a circular buffer and a dual operand addressing method
* N = 80, y = h0 (N) * x (N) * x + h1 (N - 1) +... + h78 * (n - 78) + h79 x x x (n - 79)
* first use matlab, select 80 hamming window to design a low pass filter with a cutoff frequency of 0.2 PI
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