1. Voice Recognition Hardware Development Read My Lips John Porter, Lavanya Mynam, Gerald Mortensen

2. Problem Statement Next generation keyboard architecture for voice recognition: - Identify microphone candidates - Direction Finding - Basic signal Conditioning - Optional wireless input - Performance testing protocol - Integrated keyboard packaging

3. Project Learning: Microphones Condenser Microphones Electret Microphones  Omni-directional microphones  Unidirectional microphones Specifications Impedance (about 200 Ω or lower) Frequency response ( 50 Hz to 16 kHz) Dynamic range (softest to loudest sound) Sensitivity (47 dB) Cost Size

4. Project Learning: Detecting Direction Theory –Subtracting signals to create a highly directional microphone.

5. Project Learning: Placement Idea

6. Project Learning: Signal Conditioning Single unidirectional microphone Uni Omni D

7. Microphone Direction Testing

8. Project learning: Issues Technical questions –Precision –Microphones locations –Toggle between text and software

9. Project learning: Direction Finding Multiple unidirectional microphones Omni Uni Comparators “C” Differential Op Amp “D” D D D CC

10. Project learning: Wireless Electrosonics

11. Project learning: Via Voice Platforms ( Windows Me/98/2000/XP ) Capabilities –Converts speech to text –User adaptation –Understandability (accents) –Multiple users

12. Testing Ideas Methods –Lazy Susan –Waveform Comparisons –Speech to text translation Metrics –Noise level –Noise source –Microphone orientation –Accuracy

13. Project Management Schedule –Mid project review: 4/12/2007 –Initial prototype: 4/25/2007 –Final Design Review: 5/3/2007

14. Budget Budget ( $4000 total ) –$50 Via Voice –$50 Poster –$300 USB audio device –$400 Two PCB Designs with setups –$200 Testing hardware –$750 Transportation –$500 Miscellaneous parts –$250 Miscellaneous tools –$500 Reserve –$1000 ECE Program Contribution