Struct GoertzelDetector 

pub struct GoertzelDetector { /* private fields */ }

A Goertzel single-frequency detector: computes the DFT magnitude at one target frequency via a simple two-pole recursive filter, without a full FFT. Ideal for detecting a known tone (e.g. DTMF, a pilot tone) from a stream of samples on constrained hardware.

Implementations

impl GoertzelDetector

pub fn new(target_freq_hz: f32, sample_rate_hz: f32) -> Self

Creates a detector tuned to target_freq_hz at the given sample_rate_hz.

pub fn process_sample(&mut self, x: f32)

Feeds one input sample into the detector.

pub fn magnitude(&self) -> f32

Returns the magnitude of the target-frequency component accumulated so far, normalized by the number of samples processed so it approximates the input sinusoid’s amplitude regardless of block length.

pub fn reset(&mut self)

Resets the detector’s internal state to start a new detection block.

Trait Implementations

impl Clone for GoertzelDetector

fn clone(&self) -> GoertzelDetector

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for GoertzelDetector

impl Debug for GoertzelDetector

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for GoertzelDetector

fn default() -> GoertzelDetector

Returns the “default value” for a type.