Scilab-Branch-6.1-GIT
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See the recommended documentation of this function
czt
chirp z-transform algorithm
Syntax
[czx]=czt(x,m,w,phi,a,theta)
Arguments
- x
input data sequence
- m
czt is evaluated at
m
points in z-plane- w
magnitude multiplier
- phi
phase increment
- a
initial magnitude
- theta
initial phase
- czx
chirp z-transform output
Description
chirp z-transform algorithm which calculates the z-transform on a
spiral in the z-plane at the points
[a*exp(j*theta)][w^kexp(j*k*phi)]
for
k=0,1,...,m-1
.
Examples
// Saving current context ax=gca(); [ffr,bds]=(ax.axes_bounds, ax.data_bounds(:)'); // rect=[-1.2,-1.2*sqrt(2),1.2,1.2*sqrt(2)]; a = .7*exp(%i*%pi/6); t=2*%pi*(0:179)/179;xsetech([0,0,0.5,1]); plot2d(sin(t)',cos(t)',[2],"012",' ',rect) plot2d([0 real(a)]',[0 imag(a)]',[3],"000") xsegs([-1.0,0;1.0,0],[0,-1.0;0,1.0]) w0=.93*exp(-%i*%pi/15);w=exp(-(0:9)*log(w0));z=a*w; zr=real(z);zi=imag(z); plot2d(zr',zi',[5],"000") xsetech([0.5,0,0.5,1]); plot2d(sin(t)',cos(t)',[2],"012",' ',rect) plot2d([0 real(a)]',[0 imag(a)]',[-1],"000") xsegs([-1.0,0;1.0,0],[0,-1.0;0,1.0]) w0=w0/(.93*.93);w=exp(-(0:9)*log(w0));z=a*w; zr=real(z);zi=imag(z); plot2d(zr',zi',[5],"000") xsetech(ffr,bds); //restore context
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