The effects of signal frequency and absolute bandwidth on gap detection in noise.
J Acoust Soc Am
; 96(3): 1458-64, 1994 Sep.
Article
en En
| MEDLINE
| ID: mdl-7963009
Whether temporal resolution in noisebursts is primarily determined by the highest frequency component in the signal or its absolute bandwidth remains unclear. In this study, the absolute bandwidths and upper cutoff frequencies of signal noisebursts were varied across broad frequency ranges, several times greater than previously jointly studied. The purpose was to determine how each independently affects detection, taking into consideration that bandwidth effects at one signal frequency might be very different from bandwidth effects at another. Gap detection thresholds were obtained for five subjects with normal hearing in a 2 IFC paradigm. Signals were noisebursts whose bandwidths and upper cutoff frequencies varied among 1, 2, 4, 8, and 12 kHz. Their duration was 150 ms and they were presented at an overall level of 75 dB SPL above a 45 dB SPL white noise floor. The largest mean gap detection threshold, 6.98 ms, was obtained for a noiseburst with a bandwidth of 1 kHz and upper cutoff frequency of 12 kHz. The smallest mean gap detection threshold, 2.22 ms, was found with a bandwidth and upper cutoff frequency of 12 kHz. Significant interactions were found to exist between absolute bandwidth and upper cutoff frequency. Although gap detection thresholds generally decreased with increasing signal frequency and bandwidth, the pattern was complex. When the absolute bandwidth was at least one-half the upper cutoff frequency then upper cutoff frequency and not bandwidth determined gap sensitivity; but when the absolute bandwidth was less than one-half of the upper frequency, then both determined gap thresholds.(ABSTRACT TRUNCATED AT 250 WORDS)
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Percepción Auditiva
/
Ruido
Tipo de estudio:
Diagnostic_studies
Límite:
Adolescent
/
Adult
/
Humans
Idioma:
En
Revista:
J Acoust Soc Am
Año:
1994
Tipo del documento:
Article
Pais de publicación:
Estados Unidos