Effects of external noise on detection of intensity increments

Walt Jesteadt, Kim S. Schairer, Lance Nizami, Samar Khaddam, Stephen T Neely

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The detection of an intensity increment in a longer duration sinusoid or pedestal is often used as a measure of intensity resolution, but the decision processes underlying this measure are poorly understood. Thresholds were obtained for detection of an increment in a 370-ms, 4-kHz pedestal in quiet or in noise to determine the relative contributions of background noise level and pedestal level, the effect of increment duration, and the effect of different noise spectra. Increment detection thresholds expressed in units of ΔL [10 log (1+ΔI/I)] decreased as pedestal levels increased. At low pedestal levels, increment detection was limited by the masking effect of the noise and was similar across noise conditions for pedestals of equal sensation level. At high pedestal levels, the noise had no effect and increment detection was determined by the pedestal level in dB SPL (sound pressure level). Increment detection improved with increasing increment duration and was altered less by a noise band above the pedestal/increment frequency than by a broadband noise that produced equal masking at the pedestal/increment frequency. The quadratic-compression model described by Neely and Jesteadt [(2005). Acta Acust. Acust. 91, 980-991] provided a better approximation to the data than a model based on excitation patterns.

Original languageEnglish (US)
Pages (from-to)1941-1953
Number of pages13
JournalJournal of the Acoustical Society of America
Volume126
Issue number4
DOIs
StatePublished - Nov 3 2009

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masking
thresholds
Pedestal
sine waves
background noise
noise spectra
sound pressure
broadband
approximation
excitation
Masking
Decision Process
Sound
Approximation
Compression

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

Cite this

Effects of external noise on detection of intensity increments. / Jesteadt, Walt; Schairer, Kim S.; Nizami, Lance; Khaddam, Samar; Neely, Stephen T.

In: Journal of the Acoustical Society of America, Vol. 126, No. 4, 03.11.2009, p. 1941-1953.

Research output: Contribution to journalArticle

Jesteadt, Walt ; Schairer, Kim S. ; Nizami, Lance ; Khaddam, Samar ; Neely, Stephen T. / Effects of external noise on detection of intensity increments. In: Journal of the Acoustical Society of America. 2009 ; Vol. 126, No. 4. pp. 1941-1953.
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