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IE 327 Introduction to Work Design Dr. Andris Freivalds Class #17

IE 327 Introduction to Work Design Dr. Andris Freivalds Class #17. Auditory Displays (pp. 316-317). Auditory signals for warnings : Attention demanding ( ↓ RT) When vision overburdened, moving about Two-stage signals Attention demanding (warning) Precise information (speech)

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IE 327 Introduction to Work Design Dr. Andris Freivalds Class #17

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  1. IE 327 Introduction to Work Design Dr. Andris Freivalds Class #17 IE 327

  2. Auditory Displays (pp. 316-317) • Auditory signals for warnings: • Attention demanding (↓ RT) • When vision overburdened, moving about • Two-stage signals • Attention demanding (warning) • Precise information (speech) • Environmental factors • Low freq. (<1000 Hz) best • Long distance, less absorption IE 327

  3. Auditory Displays - 2 • Human limitations • Peak sensitivity at 1,000 Hz • Range of 500-3,000 Hz • Increased intensity ↑ perception • But ↑ hearing damage (keep < 100 dB) • Modulate to avoid adaptation • Dissociability: separate signal from noise IE 327

  4. Speech Communications • Speech – info content • Production: • 37 phonemes • 24 consonants • 13 vowels • Intensity ~66 dB • Frequency: 200-5,000 Hz • Intelligibility (PSIL) IE 327

  5. Preferred Speech Interference LevelAverage of noise levels at 500,1000, 2000 Hz IE 327

  6. Voice Level and Distance IE 327

  7. Factors in Speech Communication-1 • Speaker • Enunciation: varying frequency/intensity • Long syllables: speech > pauses • Message • Vocabulary • Context • Transmission • Filtering, amplification • Avoid reverberation IE 327

  8. Factors in Speech Communication-2 • Receiver • Hearing protection • Aging • Synthesized speech • As natural as possible • Replay/interruption capabilities IE 327

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