Chirp Z Transform (1, 2, 3) is more powerful than zooming techniques (I use it to actually trace non-stationary chirp signals) and very usable in signal processing, but it's flexibility comes at price - the general CZT needs $3 \times FFT$, using Bluestein convolution algorithm.
Although generaly one if them can be precomputed - I have to perform full three rounds.

Is it possible to perform general Chirp Z Transform faster than using Bluestein algorithm (namely faster than $3 \times FFT$)?


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