Package io.github.dkaukov.afsk.atoms

Class Demodulator

java.lang.Object

io.github.dkaukov.afsk.atoms.Demodulator

public class Demodulator
extends Object

AFSK (Audio Frequency Shift Keying) Demodulator. Uses a center-frequency oscillator to mix incoming signal to baseband, followed by low-pass filtering and FM demodulation via phase difference (deltaQ). Outputs are normalized to approximately ±1.

Constructor Summary

Constructors

Constructor	Description
Demodulator(float sampleRate, float markFreq, float spaceFreq)

Method Summary

Modifier and Type	Method	Description
float[]	processChunk(float[] samples, int length)	Efficiently demodulate a chunk of audio samples.
float	processSample(float sample)	Optional: process a single sample at a time (less efficient).

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Demodulator

public Demodulator(float sampleRate,
 float markFreq,
 float spaceFreq)

Method Details

processChunk

public float[] processChunk(float[] samples,
 int length)

Efficiently demodulate a chunk of audio samples.

Parameters:

samples - PCM audio chunk (-1.0 to +1.0 floats)

Returns:

array of demodulated values (-1.0 to +1.0 approx)

processSample

public float processSample(float sample)

Optional: process a single sample at a time (less efficient).