Implement Zoom FFT for a specific signal

[pr1metine]

Hey,
love what y‘all are have achieved so far with this repo. I‘d also like to be a part of this project.

Among other things, I‘ve been thinking about implementing Zoom FFT in Rust. Your repo appears to be the ideal place for such a feature. Before I actually go ahead and implement this feature, I‘d like to have some feedback on this. E.g., will you be happy to review and merge a Zoom FFT implementation, should I be aware of anything in particular when implementing this, etc.?

[trueb2]

Thanks @pr1metine! It would be awesome if you can put together a ZoomFFT implementation. There are several use cases that would benefit from a specialization.

For now, I would recommend planning to the std feature flag. We could use microfft or similar for no_std, but rustfft is already added. rustfft is only used for fourier resampling at the moment. Longer term, I would like to add spectrograms (and zoomed spectrograms).