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Intelligibility of chimeric locally time-reversed speech
Ikuo Matsuo1, Kazuo Ueda2, Yoshitaka Nakajima2
1Department of Information Science, Tohoku Gakuin University, 2-1-1 Tenjinzawa, Izumi-ku, Sendai, 981-3193, Japan.
The Journal of the Acoustical Society of America
|July 3, 2020
Summary
Chimeric speech, with partially time-reversed segments, was more understandable than fully reversed speech. The auditory system can process degraded and intact speech information simultaneously for better intelligibility.
Area of Science:
- Auditory perception
- Speech processing
- Psychoacoustics
Background:
- Understanding speech intelligibility is crucial for auditory research.
- Time-reversed speech presents unique challenges to auditory processing.
Purpose of the Study:
- To investigate the intelligibility of chimeric locally time-reversed speech.
- To determine how varying the degraded band's frequency boundary and segment duration affects intelligibility.
Main Methods:
- Chimeric speech stimuli were created with varying boundary frequencies and segment durations.
- Japanese mora accuracy was measured to assess intelligibility.
- Compared intelligibility of chimeric stimuli against locally time-reversed controls.
Main Results:
- Japanese mora accuracy declined with increased degraded band width or segment duration.
- Chimeric stimuli demonstrated higher intelligibility compared to time-reversed controls.
- Intelligibility was preserved when the amplitude envelope (840-1600 Hz) remained intact.
Conclusions:
- The auditory system can integrate information from both temporally degraded and intact speech segments.
- Speech intelligibility depends on the preservation of specific frequency band envelopes.
- Auditory processing effectively utilizes multi-frequency information for speech comprehension.
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