The fast Continuous Wavelet Transform (fCWT) is a library for fast calculation of CWT.
APACHE-2.0 License
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A simple, C99, header only, 0-Clause BSD Licensed, fast fourier transform (FFT).
An adaptive fast function approximator based on tree search
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The little FFT library
A Fast Fourier Tranform Analyzer Tool built in c will convert PCM data into frequency spectral data
A library for computing the Fast Fourier Transform (FFT) in one or two dimensions.
Complex Continuous Wavelet Transform