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Diffstat (limited to 'macros/butter.sci')
| -rw-r--r-- | macros/butter.sci | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/macros/butter.sci b/macros/butter.sci index 73cdb71..febec5a 100644 --- a/macros/butter.sci +++ b/macros/butter.sci @@ -12,7 +12,6 @@ function [a, b, c, d] = butter (n, w, varargin) //Butterworth filter design. - //Calling Sequence //[b, a] = butter (n, wc) //[b, a] = butter (n, wc, "high") @@ -20,13 +19,11 @@ function [a, b, c, d] = butter (n, w, varargin) //[b, a] = butter (n, [wl, wh], "stop") //[z, p, g] = butter (…) //[…] = butter (…, "s") - //Parameters //n: positive integer value (order of filter) //wc: positive real value, // 1).Normalised digital 3dB cutoff frequency/frequencies for digital filter, in the range [0, 1] {dimensionless} // 2).Analog 3dB cutoff frequency/frequencies for analog filter, in the range [0, Inf] {rad/sec} - //Description //This function generates a Butterworth filter. Default is a discrete space (z) or digital filter using Bilinear transformation from s to z plane. //If second argument is scalar the third parameter takes in low or high, default value is low. The cutoff is pi*wc radians. @@ -34,7 +31,6 @@ function [a, b, c, d] = butter (n, w, varargin) //[b,a] = butter(n, [wl, wh], ’stop’) indicates a band reject filter with cutoffs pi*wl and pi*wh radians. //[z,p,g] = butter(...) returns filter as zero-pole-gain rather than coefficients of the numerator and denominator polynomials. //[...] = butter(...,’s’) returns a Laplace space filter,here cutoff(s) wc can be larger than 1 (rad/sec). - //Examples //[b a] = butter(4,0.3,"high") //Output |