Accession Number:

ADA434337

Title:

Across-ear Interference from Parametrically Degraded Synthetic Speech Signals in a Dichotic Cocktail-party Listening Task

Descriptive Note:

Interim rept. Oct 2004-Jan 2005

Corporate Author:

AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH HUMAN EFFECTIVENESS DIRECTORATE

Report Date:

2005-01-01

Pagination or Media Count:

17.0

Abstract:

Recent results have shown that listeners attending to the quieter of two speech signals in one ear the target ear are highly susceptible to interference from normal or time-reversed speech signals presented in the unattended ear. However, speech-shaped noise signals have little impact on the segregation of speech in the opposite ear. This suggests that there is a fundamental difference between the across-ear interference effects of speech and nonspeech signals. In this experiment, the intelligibility and contralateral-ear masking characteristics of three synthetic speech signals with parametrically adjustable speech-like properties were examined 1 a modulated noise-band MNE speech signal composed of fixed-frequency bands of envelope-modulated noise 2 a modulated sine-band MSB speech signal composed of fixed-frequency amplitude-modulated sine waves and 3 a sinewave speech signal composed of sine waves tracking the first four formats of speech. In all three cases, a systematic decrease in performance in the two-talker target-ear listening task was found as the number of bands in the contralateral speech-like masker increased.

Subject Categories:

  • Anatomy and Physiology
  • Medicine and Medical Research
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE