Discrimination of temporally asymmetric modulation with triangular envelopes on a broadband-noise carrier (L)

Andrew J. Byrne, Neal F. Viemeister, Mark A. Stellmack

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Highly detectable, time-reversed triangular amplitude modulation, with linear increases and decreases in amplitude, was used in an adaptive task to measure just-noticeable differences for changes in the direction of envelope temporal asymmetry for different modulation depths (m 1.0 and 0.5) and rates (8, 16, and 32 Hz). Thresholds were analyzed using three different measures of the modulator's shape based on (1) the change in the position of the peak within a cycle, (2) the change in the slope of the modulator's increasing amplitude portion, and (3) the change in slope measured in units of amplitude per unit cycle rather than amplitude per unit time. The amplitude per unit cycle measure resulted in the best fit to all the data, and predicted additional data that were gathered with roved modulation frequency. The results suggest that a time normalization process may be involved in the perception and discrimination of envelope shape.

Original languageEnglish (US)
Pages (from-to)593-596
Number of pages4
JournalJournal of the Acoustical Society of America
Volume129
Issue number2
DOIs
StatePublished - Feb 2011

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