cheby2 Chebyshev type II filter design with rs dB of stopband attenuation. [b, a] = cheby2 (n, rs, ws) [b, a] = cheby2 (n, rs, ws, "high") [b, a] = cheby2 (n, rs, [wl, wh]) [b, a] = cheby2 (n, rs, [wl, wh], "stop") [z, p, g] = cheby2 (…) […] = cheby2 (…, "s") n: positive integer value (order of filter) rs: non negative scalar value (stopband attenuation in dB) ws: vector, all elements must be in the range [0,1] 1).Normalised digital stopband edge(s) for digital filter, in the range [0, 1] {dimensionless} 2).Analog stopband edge(s) for analog filter, in the range [0, Inf] {rad/sec} This function generates a Chebyshev type II filter with rs dB of stopband attenuation. If third parameter is scalar then,the fourth parameter takes in high or low, default value is low. The cutoff is pi*Wc radians. [b, a] = cheby2(n, Rp, [Wl, Wh]) indicates a band pass filter with edges pi*Wl and pi*Wh radians. [b, a] = cheby2(n, Rp, [Wl, Wh], ’stop’) indicates a band reject filter with edges pi*Wl and pi*Wh radians. [z, p, g] = cheby2(...) returns filter as zero-pole-gain rather than coefficients of the numerator and denominator polynomials. [...] = cheby2(...,’s’) returns a Laplace space filter, wp can be larger than 1 rad/sec. Sonu Sharma, RGIT Mumbai (fellow at FOSSEE, IIT Bombay)