Human Factors Evaluation of Vocoders for Air Traffic Control ... - FAA

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Acknowledgement The authors would like to gratefully acknowledge the subject matter expertise provided by Randall Phillips of Cleveland Center and Patricia Horan of ACT-212. In addition, the authors would like to recognize the engineering support provided by ACT-330, especially James Eck, Edward Colemen, and John Petro. iii
Table of Contents Acknowledgement ......................................................................................................................... iii Executive Summary..................................................................................................................... viii 1. Introduction..................................................................................................................................1 1.1 Background............................................................................................................................1 1.2 Problem Statement.................................................................................................................1 1.3 Literature Review ..................................................................................................................1 2. Method .........................................................................................................................................4 2.1 Experimental Design..............................................................................................................4 2.1.1 Independent Variables ....................................................................................................4 2.1.2 Summary of Independent Variables................................................................................5 2.2 Test Format............................................................................................................................6 2.2.1 Subjective Ratings Test...................................................................................................7 2.2.2 Message Completion Test...............................................................................................7 2.2.3 Audio Preference Test.....................................................................................................8 2.2.4 Double-Blind Control .....................................................................................................8 2.2.5 Message Context.............................................................................................................8 2.2.6 Test Length and Distribution ..........................................................................................9 2.3 Data Acquisition ....................................................................................................................9 2.3.1 Participants......................................................................................................................9 2.3.2 Experiment Staff .............................................................................................................9 2.3.3 Equipment and Procedures ...........................................................................................10 2.3.4 Sample Size and Classification.....................................................................................14 3. Results........................................................................................................................................15 3.1 Subjective Ratings Test .......................................................................................................15 3.1.1 Main Effects and Interactions .......................................................................................15 3.1.2 Simple Main Effects .....................................................................................................17 3.1.3 Subjective Ratings Correlational Analysis ...................................................................32 3.2 Message Completion Test....................................................................................................32 3.3 Audio Preference Test .........................................................................................................35 3.3.1 Proportional Responses.................................................................................................36 3.3.2 Chi-Square Analysis .....................................................................................................36 3.3.3 Preference Rationale .....................................................................................................37 3.4 Exit Survey ..........................................................................................................................39 Page iv
Page 1 and 2: ote technical note techn Human Fact
Page 3: 1. Report No. DOT/FAA/CT-TN97/11 Te
Page 7 and 8: Figures 11. Mean Intelligibility Ra
Page 9 and 10: Executive Summary This study evalua
Page 11 and 12: Pickens (1996) reviewed the four fu
Page 13 and 14: 2. Method 2.1 Experimental Design 2
Page 15 and 16: Table 1. Description of Aircraft Ba
Page 17 and 18: To prevent the participants from be
Page 19 and 20: stimulus materials aided by the ATC
Page 21 and 22: noise. This direct communication li
Page 23 and 24: participant. A custom-made switch p
Page 25 and 26: Table 6. Mean Intelligibility Ratin
Page 27 and 28: Table 12. Analysis of Simple Main E
Page 29 and 30: Mean Intelligibility Rating Female
Page 31 and 32: Mean Acceptability Rating Female Vo
Page 33 and 34: Mean Intelligibility Rating 8 7 6 5
Page 35 and 36: Male Voice Condition Mean Acceptabi
Page 37 and 38: Mean Intelligibility Rating Vocoder
Page 39 and 40: Table 23. Tukey HSD Post Hoc Compar
Page 41 and 42: Mean Acceptability Rating Radio Equ
Page 43 and 44: Table 27. ANOVA for Message Complet
Page 45 and 46: 3.3.1 Proportional Responses Of the
Page 47 and 48: Table 31 gives the classification u
Page 49 and 50: Table 32. Exit Survey Results Query
Page 51 and 52: 4.1.4 Correlation Results The resul
Page 53 and 54: References Child, J., Cleve, R., &
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Acronyms ANOVA APT ARTCC ATC ATCS A
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BEGIN Phrase A1: “JETLINK TWENTY-
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A.3 Audio Preference Test INSTRUCTI
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