cheby1 Chebyshev type I filter design with rp dB of passband ripple. [b, a] = cheby1 (n, rp, wp) [b, a] = cheby1 (n, rp, wp, "high") [b, a] = cheby1 (n, rp, [wl, wh]) [b, a] = cheby1 (n, rp, [wl, wh], "stop") [z, p, g] = cheby1 (…) […] = cheby1 (…, "s") n: positive integer value (order of filter) rp: non negative scalar value (passband ripple) wp: vector, all elements must be in the range [0,1] 1).Normalised digital passband edge(s) for digital filter, in the range [0, 1] {dimensionless} 2).Analog passband edge(s) for analog filter, in the range [0, Inf] {rad/sec} This function generates a Chebyshev type I filter with rp dB of passband ripple. if third parameter is scalar the fourth parameter takes in high or low, default value is low. The cutoff is pi*Wc radians. [b, a] = cheby1(n, Rp, [Wl, Wh]) indicates a band pass filter with edges pi*Wl and pi*Wh radians. [b, a] = cheby1(n, Rp, [Wl, Wh], ’stop’) indicates a band reject filter with edges pi*Wl and pi*Wh radians. [z, p, g] = cheby1(...) returns filter as zero-pole-gain rather than coefficients of the numerator and denominator polynomials. [...] = cheby1(...,’s’) returns a Laplace space filter, w can be larger than 1 rad/sec. Sonu Sharma, RGIT Mumbai (fellow at FOSSEE, IIT Bombay)