Window functions

Description

Windows for spectral analysis.

These are generally double-precision, because they are mostly calculated during setup/reconfiguring, not real-time code.

Files
file	windows.h

Classes
class	signalsmith::windows::Kaiser
	The Kaiser window (almost) maximises the energy in the main-lobe compared to the side-lobes. More...
class	signalsmith::windows::ApproximateConfinedGaussian
	The Approximate Confined Gaussian window is (almost) optimal. More...

Functions
template<typename Data>
void	signalsmith::windows::forcePerfectReconstruction (Data &&data, int windowLength, int interval)
	Forces STFT perfect-reconstruction (WOLA) on an existing window, for a given STFT interval.

Function Documentation

forcePerfectReconstruction()

template<typename Data>

void signalsmith::windows::forcePerfectReconstruction	(	Data &&	data,
		int	windowLength,
		int	interval )

Forces STFT perfect-reconstruction (WOLA) on an existing window, for a given STFT interval.

For example, here are perfect-reconstruction versions of the approximately-optimal Kaiser windows:

Note the lower overall energy, and the pointy top for 2x bandwidth. Spectral performance is about the same, though.