Goertzel.h File Reference

Goertzel algorithm for efficient single-frequency detection. More...

#include "../Core/DspMath.h"
#include <algorithm>
#include <cassert>
#include <cmath>
#include <numbers>

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Classes
class	dspark::Goertzel< T >
	Single-frequency magnitude detector using the Goertzel algorithm. More...

Namespaces
namespace	dspark
	Main namespace for the DSPark framework.

Detailed Description

Goertzel algorithm for efficient single-frequency detection.

The Goertzel algorithm computes the magnitude and phase at a specific frequency in O(N) time. It acts as an extremely narrow bandpass filter evaluated over a specific block size (N).

Note

Because it uses a rectangular window inherently, if the target frequency does not align exactly with a harmonic of the window (fs/N), it will suffer from spectral leakage. For precise offline analysis, consider pre-windowing your input data (e.g., Hann window).

Threading: owner-managed. All methods (prepare, push/process, readouts, reset) are meant to be called from the thread that owns the stream; no internal synchronization is provided. Use one instance per thread.

Dependencies: DspMath.h.

Definition in file Goertzel.h.