Standard window functions for spectral analysis and FIR filter design. More...

#include <algorithm>
#include <cassert>
#include <cmath>
#include <cstddef>
#include <numbers>

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Classes
struct	dspark::WindowFunctions< T >
	Static utility generating window functions for DSP analysis/synthesis. More...

Namespaces
namespace	dspark
	Main namespace for the DSPark framework.

Detailed Description

Standard window functions for spectral analysis and FIR filter design.

Window functions taper the edges of an audio frame to reduce spectral leakage when using the FFT. Each window has different trade-offs between main lobe width (frequency resolution) and side lobe level (leakage suppression).

All windows are computed internally in double precision and cast to T on store: window generation is setup-time work, so float builds get the full float accuracy for free (this matters for high-attenuation designs such as Kaiser beta 10+, where a float Bessel series would eat into the stopband).

Quick guide for choosing a window:

Window	Main lobe	Side lobes	Best for
Hann	Medium	-31 dB	General-purpose spectral analysis
Hamming	Medium	-42 dB	Speech analysis, FIR design
Blackman	Wide	-58 dB	High dynamic range analysis
BlackmanHarris	Wide	-92 dB	Precision measurement
Kaiser	Variable	Variable	Configurable – FIR design
FlatTop	Very wide	-93 dB	Amplitude-accurate measurement
Rectangular	Narrowest	-13 dB	Transient analysis (no windowing)
Triangular	Medium	-26 dB	Simple overlap-add applications

Dependencies: C++20 standard library only.

Definition in file WindowFunctions.h.

Classes

Namespaces

Detailed Description