Intrinsic envelope fluctuations and modulation-detection thresholds for narrow-band noise carriers

Torsten Dau; Jesko Verhey; Armin Kohlrausch

doi:10.1121/1.428103

journal article Nov 01, 1999

Intrinsic envelope fluctuations and modulation-detection thresholds for narrow-band noise carriers

Torsten Dau Jesko Verhey Armin Kohlrausch

The Journal of the Acoustical Society of America Vol. 106 No. 5 pp. 2752-2760 · Acoustical Society of America (ASA)

View at Publisher Save 10.1121/1.428103

Abstract

A model is presented which calculates the intrinsic envelope power of a bandpass noise carrier within the passband of a hypothetical modulation filter tuned to a specific modulation frequency. Model predictions are compared to experimentally obtained amplitude modulation (AM) detection thresholds. In experiment 1, thresholds for modulation rates of 5, 25, and 100 Hz imposed on a bandpass Gaussian noise carrier with a fixed upper cutoff frequency of 6 kHz and a bandwidth in the range from 1 to 6000 Hz were obtained. In experiment 2, three noises with different spectra of the intrinsic fluctuations served as the carrier: Gaussian noise, multiplied noise, and low-noise noise. In each case, the carrier was spectrally centered at 5 kHz and had a bandwidth of 50 Hz. The AM detection thresholds were obtained for modulation frequencies of 10, 20, 30, 50, 70, and 100 Hz. The intrinsic envelope power of the carrier at the output of the modulation filter tuned to the signal modulation frequency appears to provide a good estimate for AM detection threshold. The results are compared with predictions on the basis of the more complex auditory processing model by Dau et al. [J. Acoust. Soc. Am. 99, 3615–3622 (1997)].

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References

Details

Published: Nov 01, 1999
Vol/Issue: 106(5)
Pages: 2752-2760

Authors

T

Torsten Dau

Carl von Ossietzky Universität Oldenburg, AG Medizinische Physik, Graduiertenkolleg Psychoakustik, D-26111 Oldenburg, Germany

J

Jesko Verhey

Carl von Ossietzky Universität Oldenburg, AG Medizinische Physik, Graduiertenkolleg Psychoakustik, D-26111 Oldenburg, Germany

A

Armin Kohlrausch

IPO Center for Research on User-System Interaction, P.O. Box 513, 5600 MB Eindhoven, The Netherlands; Philips Research Laboratories Eindhoven, Prof. Holstlaan 4, 5656 AA Eindhoven, The Netherlands

Cite This Article

Torsten Dau, Jesko Verhey, Armin Kohlrausch (1999). Intrinsic envelope fluctuations and modulation-detection thresholds for narrow-band noise carriers. The Journal of the Acoustical Society of America, 106(5), 2752-2760. https://doi.org/10.1121/1.428103

Intrinsic envelope fluctuations and modulation-detection thresholds for narrow-band noise carriers

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