Class AudioSpectrogram

java.lang.Object

org.episteme.core.media.audio.AudioSpectrogram

public final class AudioSpectrogram
extends Object

Convenience wrapper for frequency analysis using SignalFFT.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	AudioSpectrogram.WindowFunction

Method Summary

Modifier and Type	Method	Description
static Real	binToFrequency(int binIndex, int fftSize, double sampleRate)	Converts bin index to frequency.
static double[]	calculateSpectrum(double[] buffer, AudioSpectrogram.WindowFunction window)	Calculates the magnitude spectrum of a buffer.
static List<double[]>	computeSpectrogram(double[] audioData, int windowSize, int overlap, AudioSpectrogram.WindowFunction window)	Computes a full spectrogram (list of spectrums) for a long buffer.

Methods inherited from class Object

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

Method Details

calculateSpectrum

public static double[] calculateSpectrum(double[] buffer,
 AudioSpectrogram.WindowFunction window)

Calculates the magnitude spectrum of a buffer. Uses the best available FFTProvider.

computeSpectrogram

public static List<double[]> computeSpectrogram(double[] audioData,
 int windowSize,
 int overlap,
 AudioSpectrogram.WindowFunction window)

Computes a full spectrogram (list of spectrums) for a long buffer.

binToFrequency

public static Real binToFrequency(int binIndex,
 int fftSize,
 double sampleRate)

Converts bin index to frequency.