Recognition of amplitude-modulation patterns in the presence of a distractor. II. Effects of dichotic presentation and unmodulated distractors.
Listeners indicated which of two comparisons had the same pattern of amplitude modulation as a target signal when distractors were presented simultaneously with the comparisons. The frequency separation between distractors and comparisons was either narrow or wide. Distractors were either modulated independently of the comparisons, comodulated with the comparisons, or unmodulated. At wide frequency separations, none of the distractors interfered significantly with modulation comparison, relative to performance with no distractors. At narrow frequency separations, comodulated distractors produced less interference than did independently modulated distractors. Unmodulated distractors also produced some interference. There was no difference between diotic presentation and dichotic presentation, in which distractors were presented to the opposite ear from targets and comparisons. Implications for the presentation of multiple envelope signals derived from different spectral regions of a speech signal to convey speech to hearing-impaired listeners are discussed.
Takeuchi
A H
AH
Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge 02139, USA.
Braida
L D
LD
D001307:Auditory Perception; D004007:Dichotic Listening Tests; D006801:Humans; D011571:Psychoacoustics; D013647:Task Performance and Analysis