The role of the envelope in the discrimination of rippled spectra by listeners with different auditory sensitivity

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Resumo

A sound signal with a rippled spectrum exhibits envelope periodicity, which is absent in signals with a continuous spectrum. The study investigated the role of the signal envelope in discriminating signals with rippled spectra. The test signal was noise with a rippled spectrum and a spectral bandwidth of 2 octaves. Noise with a continuous spectrum was used as a reference signal. The experiments involved listeners with different levels of auditory sensitivity. To assess the ability to distinguish the density of rippled spectrum, a phase-reversal test was applied. Discrimination thresholds for spectral density were determined depending on the ripple spacing for two types of signals: without envelope modulation and with added envelope modulation. A decrease in auditory sensitivity resulted in a reduced ability to discriminate spectral density at all ripple spacing values. Amplitude modulation led to a deterioration in discrimination ability across all listeners and for all ripple spacing values, though not to thresholds determined by spectral mechanisms. It is suggested that discrimination in this task is driven by a temporal analysis mechanism rather than by envelope periodicity. The addition of modulation reduced the perception of repetition pitch.

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Sobre autores

D. Nechaev

Institute of Ecology and Evolution of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: dm.nechaev@yandex.ru
Rússia, 33, Leninsky Ave., Moscow, 119071

O. Milekhina

Institute of Ecology and Evolution of the Russian Academy of Sciences

Email: dm.nechaev@yandex.ru
Rússia, 33, Leninsky Ave., Moscow, 119071

M. Tomozova

Institute of Ecology and Evolution of the Russian Academy of Sciences

Email: dm.nechaev@yandex.ru
Rússia, 33, Leninsky Ave., Moscow, 119071

A. Supin

Institute of Ecology and Evolution of the Russian Academy of Sciences

Email: dm.nechaev@yandex.ru
Rússia, 33, Leninsky Ave., Moscow, 119071

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2. Fig. 1. Averaged audiograms of listeners by hearing loss category. Error bars are standard deviation.

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3. Fig. 2. Example of a comb spectrum and its ACF. A. A comb spectrum with a density of 5 cycles/oct and 37% ridge width. B. The ACF of the spectrum from A. C. A comb spectrum with a density of 5 cycles/oct and a ridge width of 9%. D. AFC spectrum from C. Different shading shows spectra with opposite phase of the spectral crests.

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4. Fig. 3. Example of the spectrum of the test and reference signals and their envelope spectra. A. A comb spectrum with a density of 5 cycles/oct. B. Reference signal spectrum. C. The envelope spectrum of the unmodulated signal with a comb spectrum. D. Same for the reference signal. E. The envelope spectrum of a modulated signal with a comb spectrum, modulation frequency 0.283 kHz. Е. The same for the reference signal.

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5. Fig. 4. Dependence of the distinction of the comb spectrum density on the width of the spectrum crests for listeners with different degrees of hearing loss in the absence of amplitude modulation of the audio signal. Error bars are standard deviation.

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6. Fig. 5. Dependence of the distinction of the comb spectrum density on the width of the spectrum crests for listeners with different degrees of hearing loss in the presence of amplitude modulation of the audio signal. Error bars are standard deviation.

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7. Fig. 6. Dependence of the distinction of the comb spectrum density on the average tonal threshold for different widths of the spectrum combs. Each marker is the result of an individual listener. Vertical dashed lines mark the boundaries between groups of listeners.

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8. Fig. 7. Dependence of the interval between spectrum crests at the threshold of distinction on the width of spectrum crests for different groups of listeners.

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9. Fig. 8. Dependence of the amplitude of the first component of the AFC at the threshold of distinction of the spectrum density on the width of the spectrum ridges for listeners of different groups.

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