Implementation of the Chirp Z-Transform and its inverse. This is a straightforward implementation (in Python, using numpy and scipy) of the algorithms described in
V. Sukhoy and A. Stoytchev, Generalizing the inverse FFT off the unit circle. Sci Rep 9, 14443 (2019).
Since the real work has been done by Sukhoy and Stoytchev (a fast algorithm for the Chirp Z-Transform has been known for a long time, but a fast inverse was only discovered recently by Sukhoy and Stoytchev), I am releasing this code into the public domain.