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Creating a Chebychev Type 1 and Butterworth Notch filter

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Terry Carney
Terry Carney 2021년 5월 14일
댓글: Terry Carney 2021년 5월 15일
Hello,
I'm trying to create both a Chebychev Type 1 and Butterworth Notch filter. The filters have to produce a min attenuation of 60dB at 10Hz, with a rippe of .01dB. However, I keep getting a syntax error that I'm confused with: "The cutoff frequencies must be within the interval of (0,1)."
I guess I'm confused on how to interpret this information into code, along with filtfilt and fvtool. Is this the expected value?
%Setting up signal:
fs = 200; %Sample Frequency
Ts = 1/fs; %Sample Period
t = 0:Ts:9.9950;
x = load("data2.txt");
plot(t,x);
%My cheby1 example
b = cheby1(2,.01,.1)
x2 = filtfilt(b,1,x)
fvtool(b,1)
plot(t,x2)
I'm assuming if I'm on the right track with cheby1, butterworth should be similar.
  댓글 수: 4
Terry Carney
Terry Carney 2021년 5월 15일
I figured it out. Thank you though.

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