tool/io.github.kmplitert.tool.audio/SignalProcessing

SignalProcessing

object SignalProcessing

Utility functions for audio signal processing.

Functions

fun fft(real: FloatArray, imag: FloatArray)

Performs an In-place Fast Fourier Transform.

fun hammingWindow(size: Int): FloatArray

Applies a Hamming window to the signal.

fun hanningWindow(size: Int): FloatArray

Applies a Hanning window to the signal.

fun hzToMel(hz: Float): Float

Converts a frequency in Hertz to Mel scale.

fun melFilterBanks(numFilters: Int, fftSize: Int, sampleRate: Int, lowFreq: Float = 0.0f, highFreq: Float = sampleRate / 2f): Array<FloatArray>

Generates Mel filter banks.

fun melSpectrogram(signal: FloatArray, sampleRate: Int, fftSize: Int, hopSize: Int, numMels: Int, window: FloatArray = hanningWindow(fftSize)): List<FloatArray>

Computes the Mel-spectrogram of a signal.

fun melToHz(mel: Float): Float

Converts a Mel scale value back to frequency in Hertz.

powerSpectrogram

fun powerSpectrogram(signal: FloatArray, fftSize: Int, hopSize: Int, window: FloatArray): List<FloatArray>

Computes the power spectrogram of a signal.