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I am reading the proakis book"DSP USING MATLAB 3rd Edition"

In chap 7, article 7.3, i came across example 7.8,where i saw formulas for pass band ripple and stop band attenuation I have highlighted them in attached snapshot but i couldn't find out how they were calculated filte

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From the code you can see that they compute the maximum passband ripple by computing the minimum value of the filter's magnitude response in the passband. Similarly, they compute the maximum value of the magnitude response in the stopband, corresponding to the maximum stopband ripple.

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