Across-ear Interference from Parametrically Degraded Synthetic Speech Signals in a Dichotic Cocktail-party Listening Task
Interim rept. Oct 2004-Jan 2005
AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH HUMAN EFFECTIVENESS DIRECTORATE
Pagination or Media Count:
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.
- Anatomy and Physiology
- Medicine and Medical Research
- Radiofrequency Wave Propagation