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MIT的一个数字频综源代码

module: first_order_lowpass
parameters: double fp, double gain
inputs: double in
outputs:  double out
static_variables:
classes: Filter filt("K","1 + 1/(2*pi*fp)*s","K,fp,Ts",gain,fp,Ts);
init: 
filt.reset(0.0);
code:
filt.inp(in);
out = filt.out;