czt

(/tools/hpmatlab/toolbox/signal/czt.m)

Function Synopsis

g = czt(x, k, w, a)

Help text

CZT	Chirp z-transform.
	G = CZT(X, M, W, A) returns the M-element z-transform of data X,
	where M, W and A are scalars which specify the contour in the z-plane
	on which the z-transform is computed.  M is the length of the transform,
	W is the complex ratio between points on the contour, and A is the
	complex starting point.  More explicitly, the contour in the z-plane
	(a spiral or "chirp" contour) is described by
	    z = A * W.^(-(0:M-1))

	The parameters M, W, and A are optional; their default values are 
	M = length(X), W = exp(-j*2*pi/M), and A = 1.  These defaults
	cause CZT to return the z-transform of X at equally spaced points
	around the unit circle, equivalent to FFT(X).

	If X is a matrix, the chirp z-transform operation is applied to each
	column.

	See also FFT, FREQZ.

Cross-Reference Information

any            /tools/hpmatlab/toolbox/matlab/ops/any.m
end            /tools/hpmatlab/toolbox/matlab/lang/end.m
error          /tools/hpmatlab/toolbox/matlab/lang/error.m
exp            /tools/hpmatlab/toolbox/matlab/elfun/exp.m
fft            /tools/hpmatlab/toolbox/matlab/datafun/fft.m
if             /tools/hpmatlab/toolbox/matlab/lang/if.m
ifft           /tools/hpmatlab/toolbox/matlab/datafun/ifft.m
length         /tools/hpmatlab/toolbox/matlab/general/length.m
nargin         /tools/hpmatlab/toolbox/matlab/elmat/nargin.m
ones           /tools/hpmatlab/toolbox/matlab/elmat/ones.m
pi             /tools/hpmatlab/toolbox/matlab/elmat/pi.m
size           /tools/hpmatlab/toolbox/matlab/general/size.m
sqrt           /tools/hpmatlab/toolbox/matlab/elfun/sqrt.m
while          /tools/hpmatlab/toolbox/matlab/lang/while.m

cztdemo        /tools/hpmatlab/toolbox/signal/cztdemo.m