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Calc-coeffs()函数可以为低通、高通和带阻弄滤波器计算FIR滤波器系数h(i)（参见附表）。就奇值滤波器长度N来说，对h[(N-1)/)
The Calc-coeffs () function calculates the FIR filter coefficients h (i) for the low-pass, high-pass, and band-reject filters (see the attached table). For odd value filter length N, h [(N-1) /)