Examples
+[a,b]=ellipord(0.2, 0.5, 0.7, 0.4) +a = 1 +b = 0.20000 |  |  |
This function computes the minimum filter order of an elliptic filter with the desired response characteristics.
[n] = ellipord(Wp, Ws, Rp, Rs) +[n, Wp] = ellipord(Wp, Ws, Rp, Rs)
scalar or vector of length 2, all elements must be in the range [0,1]
scalar or vector of length 2, all elements must be in the range [0,1]
real or complex value
real or complex value
This is an Octave function. +This function computes the minimum filter order of an elliptic filter with the desired response characteristics. +Stopband frequency ws and passband frequency wp specify the the filter frequency band edges. +Frequencies are normalized to the Nyquist frequency in the range [0,1]. +Rp is measured in decibels and is the allowable passband ripple and Rs is also measured in decibels and is the minimum attenuation in the stop band. +If ws>wp then the filter is a low pass filter. If wp>ws, then the filter is a high pass filter. +If wp and ws are vectors of length 2, then the passband interval is defined by wp and the stopband interval is defined by ws. +If wp is contained within the lower and upper limits of ws, the filter is a band-pass filter. If ws is contained within the lower and upper limits of wp, the filter is a band-stop or band-reject filter.
[a,b]=ellipord(0.2, 0.5, 0.7, 0.4) +a = 1 +b = 0.20000 | | |