Sound EEG_to_Sound_modulated (EEG me, double baseFrequency, double channelBandwidth, const wchar_t *channelRanges) {
try {
long numberOfChannels;
autoNUMvector <long> channelNumbers (NUMstring_getElementsOfRanges (channelRanges, my d_numberOfChannels, & numberOfChannels, NULL, L"channel", true), 1);
double maxFreq = baseFrequency + my d_numberOfChannels * channelBandwidth;
double samplingFrequency = 2 * maxFreq;
samplingFrequency = samplingFrequency < 44100 ? 44100 : samplingFrequency;
autoSound thee = Sound_createSimple (1, my xmax - my xmin, samplingFrequency);
for (long i = 1; i <= numberOfChannels; i++) {
long ichannel = channelNumbers[i];
double fbase = baseFrequency;// + (ichannel - 1) * channelBandwidth;
autoSound si = Sound_extractChannel (my d_sound, ichannel);
autoSpectrum spi = Sound_to_Spectrum (si.peek(), 1);
Spectrum_passHannBand (spi.peek(), 0.5, channelBandwidth - 0.5, 0.5);
autoSpectrum spi_shifted = Spectrum_shiftFrequencies (spi.peek(), fbase, samplingFrequency / 2, 30);
autoSound resampled = Spectrum_to_Sound (spi_shifted.peek());
long nx = resampled -> nx < thy nx ? resampled -> nx : thy nx;
for (long j = 1; j <= nx; j++) {
thy z[1][j] += resampled -> z[1][j];
}
}
Vector_scale (thee.peek(), 0.99);
return thee.transfer();
} catch (MelderError) {
Melder_throw (me, ": no playable sound created.");
}
}
Sound EEG_to_Sound_frequencyShifted (EEG me, long channel, double frequencyShift, double samplingFrequency, double maxAmp) {
try {
autoSound si = Sound_extractChannel (my d_sound, channel);
autoSpectrum spi = Sound_to_Spectrum (si.peek(), 1);
autoSpectrum spi_shifted = Spectrum_shiftFrequencies (spi.peek(), frequencyShift, samplingFrequency / 2, 30);
autoSound thee = Spectrum_to_Sound (spi_shifted.peek());
if (maxAmp > 0) {
Vector_scale (thee.peek(), maxAmp);
}
return thee.transfer();
} catch (MelderError) {
Melder_throw (me, ": channel not converted to sound.");
}
}
autoSound Sound_filter_stopHannBand (Sound me, double fmin, double fmax, double smooth) {
try {
autoSound thee = Data_copy (me);
if (my ny == 1) {
autoSpectrum spec = Sound_to_Spectrum (me, true);
Spectrum_stopHannBand (spec.peek(), fmin, fmax, smooth);
autoSound him = Spectrum_to_Sound (spec.peek());
NUMvector_copyElements (his z [1], thy z [1], 1, thy nx);
} else {
for (long ichan = 1; ichan <= my ny; ichan ++) {
autoSound channel = Sound_extractChannel (me, ichan);
autoSpectrum spec = Sound_to_Spectrum (channel.peek(), true);
Spectrum_stopHannBand (spec.peek(), fmin, fmax, smooth);
autoSound him = Spectrum_to_Sound (spec.peek());
NUMvector_copyElements (his z [1], thy z [ichan], 1, thy nx);
}
}
return thee;
} catch (MelderError) {
Melder_throw (me, U": not filtered (stop Hann band).");
}
}
autoSound Sound_filter_formula (Sound me, const char32 *formula, Interpreter interpreter) {
try {
autoSound thee = Data_copy (me);
if (my ny == 1) {
autoSpectrum spec = Sound_to_Spectrum (me, true);
Matrix_formula ((Matrix) spec.peek(), formula, interpreter, nullptr);
autoSound him = Spectrum_to_Sound (spec.peek());
NUMvector_copyElements (his z [1], thy z [1], 1, thy nx);
} else {
for (long ichan = 1; ichan <= my ny; ichan ++) {
autoSound channel = Sound_extractChannel (me, ichan);
autoSpectrum spec = Sound_to_Spectrum (channel.peek(), true);
Matrix_formula ((Matrix) spec.peek(), formula, interpreter, nullptr);
autoSound him = Spectrum_to_Sound (spec.peek());
NUMvector_copyElements (his z [1], thy z [ichan], 1, thy nx);
}
}
return thee;
} catch (MelderError) {
Melder_throw (me, U": not filtered (with formula).");
}
}
Sound Sound_deepenBandModulation (Sound me, double enhancement_dB,
double flow, double fhigh, double slowModulation, double fastModulation, double bandSmoothing)
{
try {
autoSound thee = Data_copy (me);
double maximumFactor = pow (10, enhancement_dB / 20), alpha = sqrt (log (2.0));
double alphaslow = alpha / slowModulation, alphafast = alpha / fastModulation;
for (long channel = 1; channel <= my ny; channel ++) {
autoSound channelSound = Sound_extractChannel (me, channel);
autoSpectrum orgspec = Sound_to_Spectrum (channelSound.peek(), true);
/*
* Keep the part of the sound that is outside the filter bank.
*/
autoSpectrum spec = Data_copy (orgspec.peek());
Spectrum_stopHannBand (spec.peek(), flow, fhigh, bandSmoothing);
autoSound filtered = Spectrum_to_Sound (spec.peek());
long n = thy nx;
double *amp = thy z [channel];
for (long i = 1; i <= n; i ++) amp [i] = filtered -> z [1] [i];
autoMelderProgress progress (U"Deepen band modulation...");
double fmin = flow;
while (fmin < fhigh) {
/*
* Take a one-bark frequency band.
*/
double fmid_bark = NUMhertzToBark (fmin) + 0.5, ceiling;
double fmax = NUMbarkToHertz (NUMhertzToBark (fmin) + 1);
if (fmax > fhigh) fmax = fhigh;
Melder_progress (fmin / fhigh, U"Band: ", Melder_fixed (fmin, 0), U" ... ", Melder_fixed (fmax, 0), U" Hz");
NUMmatrix_copyElements (orgspec -> z, spec -> z, 1, 2, 1, spec -> nx);
Spectrum_passHannBand (spec.peek(), fmin, fmax, bandSmoothing);
autoSound band = Spectrum_to_Sound (spec.peek());
/*
* Compute a relative intensity contour.
*/
autoSound intensity = Data_copy (band.peek());
n = intensity -> nx;
amp = intensity -> z [1];
for (long i = 1; i <= n; i ++) amp [i] = 10 * log10 (amp [i] * amp [i] + 1e-6);
autoSpectrum intensityFilter = Sound_to_Spectrum (intensity.peek(), true);
n = intensityFilter -> nx;
for (long i = 1; i <= n; i ++) {
double frequency = intensityFilter -> x1 + (i - 1) * intensityFilter -> dx;
double slow = alphaslow * frequency, fast = alphafast * frequency;
double factor = exp (- fast * fast) - exp (- slow * slow);
intensityFilter -> z [1] [i] *= factor;
intensityFilter -> z [2] [i] *= factor;
}
intensity.reset (Spectrum_to_Sound (intensityFilter.peek()));
n = intensity -> nx;
amp = intensity -> z [1];
for (long i = 1; i <= n; i ++) amp [i] = pow (10, amp [i] / 2);
/*
* Clip to maximum enhancement.
*/
ceiling = 1 + (maximumFactor - 1.0) * (0.5 - 0.5 * cos (NUMpi * fmid_bark / 13));
for (long i = 1; i <= n; i ++) amp [i] = 1 / (1 / amp [i] + 1 / ceiling);
n = thy nx;
amp = thy z [channel];
for (long i = 1; i <= n; i ++) amp [i] += band -> z [1] [i] * intensity -> z [1] [i];
fmin = fmax;
}
}
Vector_scale (thee.peek(), 0.99);
/* Truncate. */
thy xmin = my xmin;
thy xmax = my xmax;
thy nx = my nx;
thy x1 = my x1;
return thee.transfer();
} catch (MelderError) {
Melder_throw (me, U": band modulation not deepened.");
}
}