Forums

Butterworth Gain in Matlab

Started by kili...@hotmail.com October 31, 2006
Hello guys,
I was trying to demodulate an AM modulated signal in matlab. Obviously if the signal has an Amplitude A, after demodulation it will be A/2. So to recover the same signal I need an LPF, which has a DC gain 2. Is that right? I've tried the following code but was not succesful. Multiplying the coefficients with a scalar.

[b,a]=butter(6,0.02);
k=2;
c=k*b;
output=filter(c,a,demod);

Thanks in advance...