Cutoff frequency in graph
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Juan Chehin
am 6 Aug. 2021
Kommentiert: Chunru
am 6 Aug. 2021
Hello, I have this code corresponding to a chebyshev filter and the graph that matlab returns to me. The question is, is the upper cutoff frequency that of the green line (0.7 on the y-axis) or that of the black line (0.25 on the x-axis)?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/704512/image.png)
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Chunru
am 6 Aug. 2021
For cheby filter, the cut-off frequency is the edge frequency at which the magnitude response of the filter is –Rp (passband ripple) decibels. In your plot, it should be somewhere between the black and blue.
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Chunru
am 6 Aug. 2021
From documentation:
Wp — Passband edge frequency
scalar | two-element vector
Passband edge frequency, specified as a scalar or a two-element vector. The passband edge frequency is the frequency at which the magnitude response of the filter is –Rp decibels. Smaller values of passband ripple, Rp, result in wider transition bands.
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