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Introduction and Motivation

Introduction and Motivation. Speech recognition is cumbersome Document navigation and editing tasks rarely studied Commercial tools support two navigation methods “Move down five lines, move right four words” Go to The quick brown fox SLOW! FRUSTRATING! ERROR-PRONE!

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Introduction and Motivation

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  1. Introduction and Motivation • Speech recognition is cumbersome • Document navigation and editing tasks rarely studied • Commercial tools support two navigation methods • “Move down five lines, move right four words” • Go to The quick brown fox • SLOW! FRUSTRATING! ERROR-PRONE! • We say “Let the computer do the walking…”

  2. Expert Interview • Experience with speech recognition • Satisfaction with speech recognition • Suggestions for improvements • Comments/opinions on our proposals

  3. Move down five lines, move right four words Go to The quick brown fox Go to page 3, paragraph 2, sentence 5, word8, character 4. Auto-scrollGo down… faster… faster… slower… stopGo right… faster… stop Auto-scroll and pause at natural landmarks: section headers, paragraphs, and user-defined landmarks: middle of page, topic sentence Navigation Proposals

  4. HierarchicalKeypad Grid Sunray X-and-Y 1 2 3 4 1 5 6 7 7 2 8 9 6 3 5 4 Navigation Proposals(Moving within a page)

  5. Pre-interview Post-interview Video taped 3 Modes Keyboard+Mouse, SR, SpeedNav™ 4 subjects Navigate document Forward Short, medium, long Backwards Medium Then, highlight short stretch of text 3 Documents Familiar Read once Unknown How do we ensure that subjects’ familiar documents are matched? Will document retention affect repeated task performance? Pilot Study

  6. Navigation Errors Undershoot Overshoot Inappropriate scroll speed Highlighting Errors Start position incorrect #chars, words, sentences End position incorrect #chars, words, sentences Command recognition errors Time to completion Number of commands spoken Number of words spoken Subjective approval Training time Fatigue Should application record timestamps of user to make timing easier? Measure long distance (between screen) navigation technique separately from short distance (on same screen) navigation? Evaluation Metrics

  7. Design Questions • Cursor • Default scroll in Word leaves cursor at bottom -- can’t read what’s below the screen! • Scroll with cursor on left margin, right margin, or center? How might position affect ability to scan left and right? • Cursor movement draws the eye; keep cursor stationary and move document instead? • Sunray Option: Can people follow diagonal cursor movement? • Speed • Need various starting speeds and speed multipliers. User-controllable? • Speech recognition adds one second delay! Causes overshoot! • User must anticipate when to stop.

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