示例#1
0
SPINET Sound_to_SPINET (Sound me, double timeStep, double windowDuration,
	double minimumFrequencyHz, double maximumFrequencyHz, long nFilters,
	double excitationErbProportion, double inhibitionErbProportion)
{
	Sound window = NULL, frame = NULL; SPINET thee = NULL;
	long i, j, k, numberOfFrames;
	double firstTime, b = 1.02, samplingFrequency = 1 / my dx;
	double *f = NULL, *bw = NULL, *aex = NULL, *ain = NULL;

	if (timeStep < my dx) timeStep = my dx;
	if (maximumFrequencyHz > samplingFrequency / 2) maximumFrequencyHz = samplingFrequency / 2;

	if (! Sampled_shortTermAnalysis (me, windowDuration, timeStep, &numberOfFrames, &firstTime) ||
		! (thee = SPINET_create (my xmin, my xmax, numberOfFrames, timeStep, firstTime,
			minimumFrequencyHz, maximumFrequencyHz, nFilters,
			excitationErbProportion, inhibitionErbProportion)) ||
		! (window = Sound_createGaussian (windowDuration, samplingFrequency)) ||
		! (frame = Sound_createSimple (1, windowDuration, samplingFrequency)) ||
		! (f = NUMdvector (1, nFilters)) || ! (bw = NUMdvector (1, nFilters)) ||
		! (aex = NUMdvector (1, nFilters)) || ! (ain = NUMdvector (1, nFilters))) goto cleanup;

	/*
		Cochlear filterbank: gammatone
	*/

	for (i=1; i <= nFilters; i++)
	{
		f[i] = NUMerbToHertz (thy y1 + (i - 1) * thy dy);
		bw[i] = 2 * NUMpi * b * (f[i] * (6.23e-6 * f[i] + 93.39e-3) + 28.52);
	}

	Melder_progress1 (0.0, L"SPINET analysis");

	for (i=1; i <= nFilters; i++)
	{
		Sound gammaTone = NULL, filtered = NULL;
		/* Contribution of outer & middle ear and phase locking */
		double bb = (f[i] / 1000) * exp (- f[i] / 1000);
		/* Time where gammafunction envelope has its maximum */
		double tgammaMax = (thy gamma - 1) / bw[i];
		/* Amplitude at tgammaMax */
		double gammaMaxAmplitude = pow ((thy gamma - 1) / (NUMe * bw[i]), (thy gamma - 1));
		double timeCorrection = tgammaMax - windowDuration / 2;
		if (! (gammaTone = Sound_createGammaTone (0, 0.1, samplingFrequency,
				thy gamma, b, f[i], 0, 0, 0)) ||
			/* filtering can be made 30% faster by taking Spectrum(me) outside the loop */
			! (filtered = Sounds_convolve (me, gammaTone, kSounds_convolve_scaling_SUM, kSounds_convolve_signalOutsideTimeDomain_ZERO))) { forget (gammaTone); goto cleanup; }
		/*
			To energy measure: weigh with broad-band transfer function
		*/
		for (j=1; j <= numberOfFrames; j++)
		{
			Sound_into_Sound (filtered, frame, Sampled_indexToX (thee, j) + timeCorrection);
			Sounds_multiply (frame, window);
			thy y[i][j] = Sound_power (frame) * bb / gammaMaxAmplitude;
		}
		forget (filtered); forget (gammaTone);
		if (! Melder_progress5 ((double)i / nFilters, L"SPINET: filter ", Melder_integer (i), L" from ",
			Melder_integer (nFilters), L".")) goto cleanup;
	}

	/*
		Excitatory and inhibitory area functions
	*/

	for (i=1; i <= nFilters; i++)
	{
		for (k=1; k <= nFilters; k++)
		{
			double fr = (f[k] - f[i]) / bw[i];
			aex[i] += fgamma (fr / thy excitationErbProportion, thy gamma);
			ain[i] += fgamma (fr / thy inhibitionErbProportion, thy gamma);
		}
	}

	/*
		On-center off-surround interactions
	*/

	for (j=1; j <= numberOfFrames; j++)
		for (i=1; i <= nFilters; i++)
		{
			double a = 0;
			for (k=1; k <= nFilters; k++)
			{
				double fr = (f[k] - f[i]) / bw[i];
				double hexsq = fgamma (fr / thy excitationErbProportion, thy gamma);
				double hinsq = fgamma (fr / thy inhibitionErbProportion, thy gamma);
				a += thy y[k][j] * (hexsq / aex[i] - hinsq / ain[i]);
			}
			thy s[i][j] = a > 0 ? a : 0;
		}
	Melder_progress1 (1.0, NULL);
cleanup:
	NUMdvector_free (aex, 1); NUMdvector_free (ain, 1);
	NUMdvector_free (f, 1); NUMdvector_free (bw, 1);
	forget (window); forget (frame);
	if (! Melder_hasError()) return thee;
	forget (thee);
	return Melder_errorp1 (L"Sound_to_SPINET: not performed.");
}
示例#2
0
SPINET Sound_to_SPINET (Sound me, double timeStep, double windowDuration,
                        double minimumFrequencyHz, double maximumFrequencyHz, long nFilters,
                        double excitationErbProportion, double inhibitionErbProportion) {
	try {
		double firstTime, b = 1.02, samplingFrequency = 1 / my dx;

		if (timeStep < my dx) {
			timeStep = my dx;
		}
		if (maximumFrequencyHz > samplingFrequency / 2) {
			maximumFrequencyHz = samplingFrequency / 2;
		}

		long numberOfFrames;
		Sampled_shortTermAnalysis (me, windowDuration, timeStep, &numberOfFrames, &firstTime);
		autoSPINET thee = SPINET_create (my xmin, my xmax, numberOfFrames, timeStep, firstTime,
		                                 minimumFrequencyHz, maximumFrequencyHz, nFilters, excitationErbProportion, inhibitionErbProportion);
		autoSound window = Sound_createGaussian (windowDuration, samplingFrequency);
		autoSound frame = Sound_createSimple (1, windowDuration, samplingFrequency);
		autoNUMvector<double> f (1, nFilters);
		autoNUMvector<double> bw (1, nFilters);
		autoNUMvector<double> aex (1, nFilters);
		autoNUMvector<double> ain (1, nFilters);

		// Cochlear filterbank: gammatone

		for (long i = 1; i <= nFilters; i++) {
			f[i] = NUMerbToHertz (thy y1 + (i - 1) * thy dy);
			bw[i] = 2 * NUMpi * b * (f[i] * (6.23e-6 * f[i] + 93.39e-3) + 28.52);
		}

		autoMelderProgress progress (L"SPINET analysis");

		for (long i = 1; i <= nFilters; i++) {
			double bb = (f[i] / 1000) * exp (- f[i] / 1000); // outer & middle ear and phase locking
			double tgammaMax = (thy gamma - 1) / bw[i]; // Time where gammafunction envelope has maximum
			double gammaMaxAmplitude = pow ( (thy gamma - 1) / (NUMe * bw[i]), (thy gamma - 1)); // tgammaMax
			double timeCorrection = tgammaMax - windowDuration / 2;

			autoSound gammaTone = Sound_createGammaTone (0, 0.1, samplingFrequency,
			                      thy gamma, b, f[i], 0, 0, 0);
			autoSound filtered = Sounds_convolve (me, gammaTone.peek(), kSounds_convolve_scaling_SUM, kSounds_convolve_signalOutsideTimeDomain_ZERO);

			// To energy measure: weigh with broad-band transfer function

			for (long j = 1; j <= numberOfFrames; j++) {
				Sound_into_Sound (filtered.peek(), frame.peek(), Sampled_indexToX (thee.peek(), j) + timeCorrection);
				Sounds_multiply (frame.peek(), window.peek());
				thy y[i][j] = Sound_power (frame.peek()) * bb / gammaMaxAmplitude;
			}
			Melder_progress ( (double) i / nFilters, L"SPINET: filter ", Melder_integer (i), L" from ",
			                   Melder_integer (nFilters), L".");
		}

		// Excitatory and inhibitory area functions

		for (long i = 1; i <= nFilters; i++) {
			for (long k = 1; k <= nFilters; k++) {
				double fr = (f[k] - f[i]) / bw[i];
				aex[i] += fgamma (fr / thy excitationErbProportion, thy gamma);
				ain[i] += fgamma (fr / thy inhibitionErbProportion, thy gamma);
			}
		}

		// On-center off-surround interactions

		for (long j = 1; j <= numberOfFrames; j++)
			for (long i = 1; i <= nFilters; i++) {
				double a = 0;
				for (long k = 1; k <= nFilters; k++) {
					double fr = (f[k] - f[i]) / bw[i];
					double hexsq = fgamma (fr / thy excitationErbProportion, thy gamma);
					double hinsq = fgamma (fr / thy inhibitionErbProportion, thy gamma);
					a += thy y[k][j] * (hexsq / aex[i] - hinsq / ain[i]);
				}
				thy s[i][j] = a > 0 ? a : 0;
			}
		return thee.transfer();
	} catch (MelderError) {
		Melder_throw (me, ":  no SPINET created.");
	}
}