Three studies compared different computer generated voices for helicopter voice warnings. Study 1 compared three LPC-encoded voices (human female, human male, and phoneme synthesized) while pilots flew simulated nap-of-the earth missions. Flight performance and pilots' ratings via semantic differential scales were measured. Study 2 produced pilot preferences for direct synthesized speech compared to LPC-encoded human female speech and compared to LPC-encoded synthesized speech. Study 3 used phonetically balanced (PB) words heard in simulated helicopter noise to compare intelligibility of direct synthesized and LPC-encoded phoneme synthesized speech. There were no flight performance differences due to voice type (Study 1), but pilots preferred direct synthesized speech over both LPC-encoded human female speech and LPC-encoded synthesized speech (Study 2). PB word intelligibility was better for direct synthesized speech than for LPC-encoded synthesized speech; there were no differences associated with sex of listener or with being a pilot or not. A runs by speech type interaction suggests differential learnability of the two speech types. (Study 3). Implications of these findings for voice selection will be discussed.
Comparison of Voice Types for Helicopter Voice Warning Systems
Sae Technical Papers
Aerospace Congress and Exposition ; 1984
1984-10-01
Conference paper
English
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