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faustでBiQuadフィルタの練習
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cutoff = hslider("[0]cutoff", 200, 20, 2000, 0.1); | |
resonance = hslider("[1]resonance", 0.707, 0.707, 20, 0.01); | |
low = hslider("[2]low", 1.0, 0.0, 1.0, 0.01); | |
band = hslider("[3]band", 1.0, 0.0, 1.0, 0.01); | |
high = hslider("[4]high", 1.0, 0.0, 1.0, 0.01); | |
pi = 3.141592; | |
s = tan( cutoff * pi / 44100.0 ); | |
t = s / resonance; | |
u = s*s + t + 1.0; | |
a0 = (low*s*s + band*t + high)/u; | |
a1 = 2.0*(low*s*s - high)/u; | |
a2 = (low*s*s - band*t + high)/u; | |
b1 = (-2.0)*(s*s - 1.0)/u; | |
b2 = (-1)*(s*s - t + 1.0)/u; | |
biquad=(_<:(_',_))<:((_<:(_',_)),_):(*(a2),*(a1),*(a0)):> +~(_<:(_',_):(*(b2),*(b1)):>_); | |
process=(biquad,biquad); |
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