title: Amplitude modulation detection with concurrent frequency modulation.
abstract: Human speech consists of concomitant temporal modulations in amplitude and frequency that are crucial for speech perception. In this study, amplitude modulation (AM) detection thresholds were measured for 550 and 5000 Hz carriers with and without concurrent frequency modulation (FM), at AM rates crucial for speech perception. Results indicate that adding 40 Hz FM interferes with AM detection, more so for 5000 Hz carrier and for frequency deviations exceeding the critical bandwidth of the carrier frequency. These findings suggest that future cochlear implant processors, encoding speech fine-structures may consider limiting the FM to narrow bandwidth and to low frequencies.
authors.affiliation: Cognitive Hearing Science Lab, Department of Audiology and Speech Pathology, University of Arkansas for Medical Sciences/University of Arkansas at Little Rock, 2801 South University Avenue, Little Rock, Arkansas 72204, USA nknagaraj@uams.edu.
authors.forename: Naveen K
authors.initials: NK
authors.lastname: Nagaraj