Direct Voice Versus Manual Input Technology for Aircraft CDU Operations


  1. Farrell, P.S.E.
  2. Cain, B.
  3. Sarkar, P.
  4. Ebbers, R.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Direct Voice Input (DVI) is often regarded as a replacement technology for keyboard entry activities in the cockpit. DVI may reduce workload and increase performance by exploiting verbal psychomotor resources. For this study it was assumed that DVI and manual input (MI) operations might interfere with other flying activities because these tasks require some combination of four limited resources (visual, auditory, cognitive, and psychomotor; VACP). The experiment was performed in a helicopter simulation environment. A mission scenario was developed wherein Canadian Forces Griffon helicopter pilots were asked to set radio frequencies (or radio links) using a Control Display Unit (CDU) either with MI or DVI, and to perform flying tasks that manipulated the demand on the individual VACP resources. The radio link completion times and errors were recorded along with flight, subjective workload, and video data. An analysis of variance was performed on a small subset of data, and the results suggested that DVI was superior to manual input during the psychomotor and visual phases due to the increased heads up time afforded by DVI (as reported in the literature). However, high psychomotor activity reduced the frequency of verbalization. Interestingly, MI was superior to DVI during the cognitive phase. Unexpectedly, performance did not differ between MI and DVI during the audio phase. TRUNCATED
Manual input;Direct Voice Input (DVI);Helicopter operation;Human engineering
Report Number
DCIEM-SL-1999-054 — Paper
Date of publication
01 May 1999
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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