public static List<float[]> deconvol(float[] signal, int fs, int fenetre, int n0) {
int nbfram = signal.length;
int frameparfenetre = Math.round(fs * (float) fenetre / 1000);
int recoupframe = Math.round(frameparfenetre / 2);
float[] hamming = new float[frameparfenetre];
for (int i = 0; i < frameparfenetre; i++) {
hamming[i] = (float) (0.54 - 0.46 * Math.cos(2 * Math.PI * i / (frameparfenetre - 1)));
}
int fftsize = (int) Math.pow(2, Math.ceil(log2(frameparfenetre)));
List<float[]> result = new ArrayList<>();
int end = nbfram - frameparfenetre;
for (int i = 0; i < end; i += frameparfenetre - recoupframe) {
int to = Math.min(i + frameparfenetre - 1, end);
float[] sfen = new float[to - i + 1];
System.arraycopy(signal, i, sfen, 0, sfen.length);
sfen = accentue(sfen);
for (int j = 0; j < sfen.length; j++) {
sfen[j] = sfen[j] * hamming[j];
}
FloatFFT_1D fft = new FloatFFT_1D(sfen.length);
fft.realForward(sfen);
for (int j = 0; j < sfen.length; j++) {
sfen[j] = (float) Math.log(Math.abs(sfen[j]));
}
fft.realInverse(sfen, true);
Arrays.fill(sfen, n0 + 1, sfen.length - 1, 0);
fft.realForward(sfen);
for (int j = 0; j < sfen.length; j++) {
sfen[j] = (float) Math.abs(Math.exp(sfen[j]));
}
result.add(Arrays.copyOfRange(sfen, 2, Math.round(fftsize / 2) - 1));
}
return result;
}
private void calculate() {
float[] samples = getSamples();
Window.apply(mWindow, samples);
if (mSampleType == SampleType.REAL) {
mFFT.realForward(samples);
} else {
mFFT.complexForward(samples);
}
dispatch(samples);
}
private void processRecordedData() {
mIsProcessing = true;
float[] recordedDataFFT;
recordedDataFFT = FrequencyDetector.convertToFloats(mRecordedData);
fft.realForward(recordedDataFFT);
float[] halfAbsFFT;
halfAbsFFT = FrequencyDetector.absAndHalve(recordedDataFFT);
int[] peaks;
peaks = FrequencyDetector.identifyPeaksAndRemove(halfAbsFFT);
String peakString = "";
for (int e : peaks) peakString += e + " ";
Log.d(TAG, peakString);
int frequency = FrequencyDetector.detectFrequency(peaks);
if (frequency != -1) this.updateStrings(frequency);
mIsProcessing = false;
}