def cheby1(N, rp, Wn, btype='low', analog=False, output='ba'):
 return iirfilter(N, Wn, rp=rp, btype=btype, analog=analog, output=output, ftype='cheby1')

def cheby1 ( N , rp , Wn , btype = 'low' , analog = False , output = 'ba' ) : return iirfilter ( N , Wn , rp = rp , btype = btype , analog = analog , output = output , ftype = 'cheby1' )
chebyshev type i digital and analog filter design .