Modulation masking produced by second-order modulators

Christian Füllgrabe, Brian C.J. Moore, Laurent Demany, Stephan Ewert, Stanley Sheft, Christian Lorenzi

Research output: Contribution to journalJournal articleResearchpeer-review

341 Downloads (Pure)


Recent studies suggest that an auditory nonlinearity converts second-order sinusoidal amplitude modulation (SAM) (i.e., modulation of SAM depth) into a first-order SAM component, which contributes to the perception of second-order SAM. However, conversion may also occur in other ways such as cochlear filtering. The present experiments explored the source of the first-order SAM component by investigating the ability to detect a 5-Hz, first-order SAM probe in the presence of a second-order SAM masker beating at the probe frequency. Detection performance was measured as a function of masker-carrier modulation frequency, phase relationship between the probe and masker modulator, and probe modulation depth. In experiment 1, the carrier was a 5-kHz sinusoid presented either alone or within a notched-noise masker in order to restrict off-frequency listening. In experiment 2, the carrier was a white noise. The data obtained in both carrier conditions are consistent with the existence of a modulation distortion component. However, the phase yielding poorest detection performance varied across experimental conditions between 0° and 180°, confirming that, in addition to nonlinear mechanisms, cochlear filtering and off-frequency listening play a role in second-order SAM perception. The estimated magnitude of the modulation distortion component ranges from 5%–12%. ©2005 Acoustical Society of America.
Original languageEnglish
JournalAcoustical Society of America. Journal
Issue number4
Pages (from-to)2158-2168
Publication statusPublished - 2005

Bibliographical note

Copyright (2005) Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.

Fingerprint Dive into the research topics of 'Modulation masking produced by second-order modulators'. Together they form a unique fingerprint.

Cite this