Chirp z-Transform
chirpz(v, lo, hi, d)—Returns the frequency spectrum of signal v between lo and hi at frequency intervals of d.
v is a real- or complex-valued array.
lo and hi are positive, real values for the endpoints of the frequency range. They are normalized so the sampling frequency is 1. hi is never greater than 0.5.
d is a positive real value frequency step size, such that (hilo)/d is at least 2.
Additional Information
chirpz takes the FFT of an array with length of the original input signal plus the number of points in the interpolated spectrum minus one.
If the total length of the array delivered to the FFT is a prime number or has few factors, this calculation will be slow.
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