Listeners were asked to discriminate between two amplitude-modulation functions imposed on white noise and consisting of the sum of two sinusoids. The frequency ratio of the sinusoids constituting each function was 2 or 3. In one function, the sinusoids had a constant relative phase. In the other function, their phase relation was continuously and cyclically changing, at a slow rate. For all listeners, the two functions with a frequency ratio of 2 were easily discriminated. However, discrimination was impossible when the frequency ratio was 3. Simulations were performed using an envelope-detector model and various decision statistics. The max/min statistic predicted discrimination above chance level when the frequency ratio was 3. It seems, therefore, that listeners are unable to use this statistic. In contrast, the crest factor and skewness of the envelope accounted well for the discrimination data.
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May 01 1999
Discrimination of amplitude-modulation phase spectrum
Christian Lorenzi;
Christian Lorenzi
Laboratoire de Psychologie Expérimentale, UMR CNRS 8581, Institut de Psychologie, Université René Descartes Paris V, 28, Rue Serpente, 75006 Paris, France
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Frédéric Berthommier;
Frédéric Berthommier
Institut de la Communication Parlée, UPRESA CNRS 5009, INPG, 46, avenue Félix Viallet, 38031 Grenoble Cédex, France
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Laurent Demany
Laurent Demany
Laboratoire de Neurophysiologie, UMR CNRS 5543, Université Bordeaux 2, 146 rue Léo Saignat, F-33076 Bordeaux Cédex, France
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J. Acoust. Soc. Am. 105, 2987–2990 (1999)
Article history
Received:
December 08 1997
Accepted:
February 17 1999
Citation
Christian Lorenzi, Frédéric Berthommier, Laurent Demany; Discrimination of amplitude-modulation phase spectrum. J. Acoust. Soc. Am. 1 May 1999; 105 (5): 2987–2990. https://doi.org/10.1121/1.426911
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