Segregation of concurrent sounds. I: Effects of frequency modulation coherence
- 1 December 1989
- journal article
- research article
- Published by Acoustical Society of America (ASA) in The Journal of the Acoustical Society of America
- Vol. 86 (6), 2148-2159
- https://doi.org/10.1121/1.398475
Abstract
Frequency modulationcoherence was investigated as a possible cue for the perceptual segregation of concurrent sound sources. Synthesized chords of 2‐s duration and comprising six permutations of three sung vowels (/a/, /i/, /o/) at three fundamental frequencies (130.8, 174.6, and 233.1 Hz) were constructed. In one condition, no vowels were modulated, and, in a second, all three were modulated coherently such that the ratio relations among all frequency components were maintained. In a third group of conditions, one vowel was modulated, while the other two remained steady. In a fourth group, one vowel was modulated independently of the two other vowels, which were modulated coherently with one another. Subjects were asked to judge the perceived prominence of each of the three vowels in each chord. Judged prominence increased significantly when the target vowel was modulated compared to when it was not, with the greatest increase being found for higher fundamental frequencies. The increase in prominence with modulation was unaffected by whether the target was modulated coherently or not with nontarget vowels. The modulation and pitch position of nontarget vowels had no effect on target vowel prominence. These results are discussed in terms of possible concurrent auditory grouping principles.This publication has 10 references indexed in Scilit:
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