窗函数法设计FIR滤波器为什么窗口长度比滤波器阶数大1
help FIR1里面这么写:B = FIR1(N,Wn,WIN) designs an N-th order FIR filter using
the N+1 length vector WIN to window the impulse response.
For example, B = FIR1(N,Wn,kaiser(N+1,4))
uses a Kaiser window with beta=4.
为什么要N+1而不是直接窗口长度也为N呢?
谢谢
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