Examples of org.oc.ocvolume.dsp.fft

org.oc.ocvolume.dsp.fft
last updated on June 15, 2002
description: FFT class for real signals. Upon entry, N contains the numbers of points in the DFT, real[] and imaginary[] contain the real and imaginary parts of the input. Upon return, real[] and imaginary[] contain the DFT output. All signals run from 0 to N - 1
calls: none
called by: featureExtraction
input: speech signal
output: real and imaginary part of DFT output @author Danny Su

                java.util.Arrays.fill(fftArray, 0.0);
                for (int fftArrayIndex = 0; fftArrayIndex + valuesOffset < values.length; ++fftArrayIndex) {
                    fftArray[fftArrayIndex] = values[fftArrayIndex + valuesOffset][index][i];
                }


                fft data = new fft();


                double magSpectrum[] = new double[fftArray.length];


                // calculate FFT for current frame
                fft.computeFFT(fftArray);

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