Article
Effect of frequency region and noise bandwidth on the AMFR
Journal of the Acoustical Society of America
(2000)
Abstract
This study investigated the effect of varying stimulus frequency region and noise bandwidth on the amplitude modulation following response (AMFR). The stimulus for the AMFR was an amplitude‐modulated burst of bandlimited white noise. Two carrier frequency regions (1 and 4 kHz) and two noise bandwidths (100 Hz and 1 kHz) were employed. Three women and three men with normal hearing participated in the study. Low carrier‐frequency regions produced significantly larger AMFRs than high carrier‐frequency regions. Wide‐noise bandwidths generated significantly larger AMFRs than narrow‐noise bandwidths. The noise bandwidth effect was dependent on the rate of amplitude modulation. Modulation transfer functions were derived by plotting the AMFR amplitude as a function of modulation rate. At the greatest modulation depths, the transfer function resembled a bandpass filter. For lower modulation depths, the transfer function resembled a low‐pass filter. The results of the study are in general agreement with previous research that investigated the AMFR with tone and wideband noise carrier signals.
Keywords
- Random noise,
- Bandpass filters,
- Hearing,
- Modulation transfer functions
Disciplines
Publication Date
November, 2000
DOI
10.1121/1.4743663
Publisher Statement
Paper presented at the 140th Meeting of The Acoustical Society of America, Newport Beach, California.
Citation Information
Shaum P. Bhagat and Craig A. Champlin. "Effect of frequency region and noise bandwidth on the AMFR" Journal of the Acoustical Society of America Vol. 108 Iss. 5 (2000) p. 2596 - 2597 ISSN: 1520-8524 Available at: http://works.bepress.com/shaum-bhagat/24/