Comodulation detection differences with multiple signal bands

Beverly A. Wright*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Detection thresholds were determined for signals consisting of one, two, or five noise bands embedded in eight “cue” bands. All of the noise bands were 100 Hz wide. The center frequencies of the signal bands ranged from 1250–3250 Hz in 500-Hz steps, and those of the cue bands ranged from 500–4000 Hz in 500-Hz steps. The multiple-band signals either all had the same temporal envelope, or all had different temporal envelopes. Similarly, the cue bands either all had the same temporal envelope or all had different temporal envelopes. In separate listening conditions, signal thresholds were determined for various combinations of the temporal envelope patterns of the signal and cue bands. The results were analyzed both in terms of differences in threshold across listening conditions, and in terms of changes in threshold within a listening condition, as the number of signal bands was increased. For both the single- and multiple-band signals, performance was best when the signal band(s) had a different envelope from the common envelope of the cue bands, and performance was worst when either the cue bands all had different envelopes, or the signal and cue bands all shared the same envelope. The thresholds of the multiple-band signals were better fitted by an independent-thresholds model than by a statistical-summation model. However, neither model predicted thresholds uniformly well in all listening conditions. The results are discussed in terms of both “within-channel” and “across-channel” models.

Original languageEnglish (US)
Pages (from-to)292-303
Number of pages12
Journaljournal of the Acoustical Society of America
Volume87
Issue number1
DOIs
StatePublished - Jan 1990

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

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