Class AudioEqualizer

java.lang.Object

org.episteme.core.media.audio.AudioEqualizer

public final class AudioEqualizer
extends Object

Standard biquad filters for audio equalization.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final class	AudioEqualizer.BiquadParameters
static enum	AudioEqualizer.FilterType

Method Summary

Modifier and Type	Method	Description
static AudioEqualizer.BiquadParameters	calculateCoefficients(AudioEqualizer.FilterType type, double freq, double sampleRate, double q, double gainDb)	Calculates filter coefficients based on Robert Bristow-Johnson's Audio EQ Cookbook.
static Real	magnitudeResponse(AudioEqualizer.BiquadParameters p, double freq, double sampleRate)	Calculates the magnitude response (frequency response) at a specific frequency.
static double[]	process(double[] input, AudioEqualizer.BiquadParameters p)	Processes a buffer of audio samples using the given filter coefficients.

Methods inherited from class Object

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

Method Details

calculateCoefficients

public static AudioEqualizer.BiquadParameters calculateCoefficients(AudioEqualizer.FilterType type,
 double freq,
 double sampleRate,
 double q,
 double gainDb)

Calculates filter coefficients based on Robert Bristow-Johnson's Audio EQ Cookbook.

Parameters:

type - Filter type

freq - Cutoff/Center frequency (Hz)

sampleRate - Sample rate (e.g., 44100)

q - Quality factor

gainDb - Gain in decibels (for Peaking/Shelf filters)

process

public static double[] process(double[] input,
 AudioEqualizer.BiquadParameters p)

Processes a buffer of audio samples using the given filter coefficients. Uses Direct Form I implementation.

magnitudeResponse

public static Real magnitudeResponse(AudioEqualizer.BiquadParameters p,
 double freq,
 double sampleRate)

Calculates the magnitude response (frequency response) at a specific frequency.