Ltas PointProcess_Sound_to_Ltas_harmonics (PointProcess pulses, Sound sound,
long maximumHarmonic,
double shortestPeriod, double longestPeriod, double maximumPeriodFactor)
{
try {
long numberOfPeriods = pulses -> nt - 2;
autoLtas ltas = Ltas_create (maximumHarmonic, 1.0);
ltas -> xmax = maximumHarmonic;
if (numberOfPeriods < 1)
Melder_throw ("There are no periods in the point process.");
autoMelderProgress progress (L"LTAS (harmonics) analysis...");
for (long ipulse = 2; ipulse < pulses -> nt; ipulse ++) {
double leftInterval = pulses -> t [ipulse] - pulses -> t [ipulse - 1];
double rightInterval = pulses -> t [ipulse + 1] - pulses -> t [ipulse];
double intervalFactor = leftInterval > rightInterval ? leftInterval / rightInterval : rightInterval / leftInterval;
Melder_progress ((double) ipulse / pulses -> nt, L"Sound & PointProcess: To Ltas: pulse ", Melder_integer (ipulse), L" out of ", Melder_integer (pulses -> nt));
if (leftInterval >= shortestPeriod && leftInterval <= longestPeriod &&
rightInterval >= shortestPeriod && rightInterval <= longestPeriod &&
intervalFactor <= maximumPeriodFactor)
{
/*
* We have a period! Compute the spectrum.
*/
long localMaximumHarmonic;
autoSound period = Sound_extractPart (sound,
pulses -> t [ipulse] - 0.5 * leftInterval, pulses -> t [ipulse] + 0.5 * rightInterval,
kSound_windowShape_RECTANGULAR, 1.0, FALSE);
autoSpectrum spectrum = Sound_to_Spectrum (period.peek(), FALSE);
localMaximumHarmonic = maximumHarmonic < spectrum -> nx ? maximumHarmonic : spectrum -> nx;
for (long iharm = 1; iharm <= localMaximumHarmonic; iharm ++) {
double realPart = spectrum -> z [1] [iharm];
double imaginaryPart = spectrum -> z [2] [iharm];
double energy = (realPart * realPart + imaginaryPart * imaginaryPart) * 2.0 * spectrum -> dx;
ltas -> z [1] [iharm] += energy;
}
} else {
numberOfPeriods -= 1;
}
}
if (numberOfPeriods < 1)
Melder_throw (L"There are no periods in the point process.");
for (long iharm = 1; iharm <= ltas -> nx; iharm ++) {
if (ltas -> z [1] [iharm] == 0.0) {
ltas -> z [1] [iharm] = -300.0;
} else {
double energyInThisBand = ltas -> z [1] [iharm];
double powerInThisBand = energyInThisBand / (sound -> xmax - sound -> xmin);
ltas -> z [1] [iharm] = 10.0 * log10 (powerInThisBand / 4.0e-10);
}
}
return ltas.transfer();
} catch (MelderError) {
Melder_throw (sound, " & ", pulses, ": LTAS analysis (harmonics) not performed.");
}
}
Ltas PointProcess_Sound_to_Ltas (PointProcess pulses, Sound sound,
double maximumFrequency, double bandWidth,
double shortestPeriod, double longestPeriod, double maximumPeriodFactor)
{
Ltas ltas = NULL, numbers = NULL;
Sound period = NULL;
Spectrum spectrum = NULL;
long numberOfPeriods = pulses -> nt - 2, ipulse, ifreq, iband, totalNumberOfEnergies = 0;
ltas = Ltas_create (maximumFrequency / bandWidth, bandWidth); cherror
ltas -> xmax = maximumFrequency;
numbers = (structLtas *)Data_copy (ltas);
if (numberOfPeriods < 1) error1 (L"Cannot compute an Ltas if there are no periods in the point process.")
for (ipulse = 2; ipulse < pulses -> nt; ipulse ++) {
double leftInterval = pulses -> t [ipulse] - pulses -> t [ipulse - 1];
double rightInterval = pulses -> t [ipulse + 1] - pulses -> t [ipulse];
double intervalFactor = leftInterval > rightInterval ? leftInterval / rightInterval : rightInterval / leftInterval;
Melder_progress4 ((double) ipulse / pulses -> nt, L"Sound & PointProcess: To Ltas: pulse ", Melder_integer (ipulse), L" out of ", Melder_integer (pulses -> nt));
if (leftInterval >= shortestPeriod && leftInterval <= longestPeriod &&
rightInterval >= shortestPeriod && rightInterval <= longestPeriod &&
intervalFactor <= maximumPeriodFactor)
{
/*
* We have a period! Compute the spectrum.
*/
period = Sound_extractPart (sound,
pulses -> t [ipulse] - 0.5 * leftInterval, pulses -> t [ipulse] + 0.5 * rightInterval,
kSound_windowShape_RECTANGULAR, 1.0, FALSE); cherror
spectrum = Sound_to_Spectrum (period, FALSE); cherror
for (ifreq = 1; ifreq <= spectrum -> nx; ifreq ++) {
double frequency = spectrum -> xmin + (ifreq - 1) * spectrum -> dx;
double realPart = spectrum -> z [1] [ifreq];
double imaginaryPart = spectrum -> z [2] [ifreq];
double energy = (realPart * realPart + imaginaryPart * imaginaryPart) * 2.0 * spectrum -> dx /* OLD: * sound -> nx */;
iband = ceil (frequency / bandWidth);
if (iband >= 1 && iband <= ltas -> nx) {
ltas -> z [1] [iband] += energy;
numbers -> z [1] [iband] += 1;
totalNumberOfEnergies += 1;
}
}
forget (spectrum);
forget (period);
} else {
Ltas PointProcess_Sound_to_Ltas (PointProcess pulses, Sound sound,
double maximumFrequency, double bandWidth,
double shortestPeriod, double longestPeriod, double maximumPeriodFactor)
{
try {
long numberOfPeriods = pulses -> nt - 2, totalNumberOfEnergies = 0;
autoLtas ltas = Ltas_create (maximumFrequency / bandWidth, bandWidth);
ltas -> xmax = maximumFrequency;
autoLtas numbers = Data_copy (ltas.peek());
if (numberOfPeriods < 1)
Melder_throw ("Cannot compute an Ltas if there are no periods in the point process.");
autoMelderProgress progress (L"Ltas analysis...");
for (long ipulse = 2; ipulse < pulses -> nt; ipulse ++) {
double leftInterval = pulses -> t [ipulse] - pulses -> t [ipulse - 1];
double rightInterval = pulses -> t [ipulse + 1] - pulses -> t [ipulse];
double intervalFactor = leftInterval > rightInterval ? leftInterval / rightInterval : rightInterval / leftInterval;
Melder_progress ((double) ipulse / pulses -> nt, L"Sound & PointProcess: To Ltas: pulse ", Melder_integer (ipulse), L" out of ", Melder_integer (pulses -> nt));
if (leftInterval >= shortestPeriod && leftInterval <= longestPeriod &&
rightInterval >= shortestPeriod && rightInterval <= longestPeriod &&
intervalFactor <= maximumPeriodFactor)
{
/*
* We have a period! Compute the spectrum.
*/
autoSound period = Sound_extractPart (sound,
pulses -> t [ipulse] - 0.5 * leftInterval, pulses -> t [ipulse] + 0.5 * rightInterval,
kSound_windowShape_RECTANGULAR, 1.0, FALSE);
autoSpectrum spectrum = Sound_to_Spectrum (period.peek(), FALSE);
for (long ifreq = 1; ifreq <= spectrum -> nx; ifreq ++) {
double frequency = spectrum -> xmin + (ifreq - 1) * spectrum -> dx;
double realPart = spectrum -> z [1] [ifreq];
double imaginaryPart = spectrum -> z [2] [ifreq];
double energy = (realPart * realPart + imaginaryPart * imaginaryPart) * 2.0 * spectrum -> dx /* OLD: * sound -> nx */;
long iband = ceil (frequency / bandWidth);
if (iband >= 1 && iband <= ltas -> nx) {
ltas -> z [1] [iband] += energy;
numbers -> z [1] [iband] += 1;
totalNumberOfEnergies += 1;
}
}
} else {
numberOfPeriods -= 1;
}
}
if (numberOfPeriods < 1)
Melder_throw ("There are no periods in the point process.");
for (long iband = 1; iband <= ltas -> nx; iband ++) {
if (numbers -> z [1] [iband] == 0.0) {
ltas -> z [1] [iband] = NUMundefined;
} else {
/*
* Each bin now contains a total energy in Pa2 sec.
* To convert this to power density, we
*/
double totalEnergyInThisBand = ltas -> z [1] [iband];
if (0 /* i.e. if you just want to have a spectrum of the voiced parts... */) {
double energyDensityInThisBand = totalEnergyInThisBand / ltas -> dx;
double powerDensityInThisBand = energyDensityInThisBand / (sound -> xmax - sound -> xmin);
ltas -> z [1] [iband] = 10.0 * log10 (powerDensityInThisBand / 4.0e-10);
} else {
/*
* And this is what we really want. The total energy has to be redistributed.
*/
double meanEnergyInThisBand = totalEnergyInThisBand / numbers -> z [1] [iband];
double meanNumberOfEnergiesPerBand = (double) totalNumberOfEnergies / ltas -> nx;
double redistributedEnergyInThisBand = meanEnergyInThisBand * meanNumberOfEnergiesPerBand;
double redistributedEnergyDensityInThisBand = redistributedEnergyInThisBand / ltas -> dx;
double redistributedPowerDensityInThisBand = redistributedEnergyDensityInThisBand / (sound -> xmax - sound -> xmin);
ltas -> z [1] [iband] = 10.0 * log10 (redistributedPowerDensityInThisBand / 4.0e-10);
/* OLD: ltas -> z [1] [iband] = 10.0 * log10 (ltas -> z [1] [iband] / numbers -> z [1] [iband] * sound -> nx);*/
}
}
}
for (long iband = 1; iband <= ltas -> nx; iband ++) {
if (ltas -> z [1] [iband] == NUMundefined) {
long ibandleft = iband - 1, ibandright = iband + 1;
while (ibandleft >= 1 && ltas -> z [1] [ibandleft] == NUMundefined) ibandleft --;
while (ibandright <= ltas -> nx && ltas -> z [1] [ibandright] == NUMundefined) ibandright ++;
if (ibandleft < 1 && ibandright > ltas -> nx)
Melder_throw ("Cannot create an Ltas without energy in any bins.");
if (ibandleft < 1) {
ltas -> z [1] [iband] = ltas -> z [1] [ibandright];
} else if (ibandright > ltas -> nx) {
ltas -> z [1] [iband] = ltas -> z [1] [ibandleft];
} else {
double frequency = ltas -> x1 + (iband - 1) * ltas -> dx;
double fleft = ltas -> x1 + (ibandleft - 1) * ltas -> dx;
double fright = ltas -> x1 + (ibandright - 1) * ltas -> dx;
ltas -> z [1] [iband] = ((fright - frequency) * ltas -> z [1] [ibandleft]
+ (frequency - fleft) * ltas -> z [1] [ibandright]) / (fright - fleft);
}
}
}
return ltas.transfer();
} catch (MelderError) {
Melder_throw (sound, " & ", pulses, ": LTAS analysis not performed.");
}
}
