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Voice Recognition Hardware Development Read My Lips John Porter, Lavanya Mynam, Gerald Mortensen. Problem Statement. Next generation keyboard architecture for voice recognition: - Identify microphone candidates - Direction Finding - Basic signal Conditioning - Optional wireless input - PowerPoint PPT Presentation
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Voice Recognition Hardware Development Read My Lips
John Porter, Lavanya Mynam, Gerald Mortensen
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
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
Project Learning: Detecting Direction
• Theory– Subtracting signals to create a highly
directional microphone.
Project Learning: Placement Idea
Project Learning: Signal Conditioning
• Single unidirectional microphone
Uni
Omni
D
Microphone Direction Testing
Project learning: Issues
• Technical questions– Precision– Microphones locations– Toggle between text and software
Project learning: Direction Finding
• Multiple unidirectional microphones
Omni
Uni
Uni
Uni
Comparators “C”Differential Op Amp “D”
D
D
D
C C
Project learning: Wireless
• Electrosonics
Project learning: Via Voice
• Platforms ( Windows Me/98/2000/XP )
• Capabilities– Converts speech to text– User adaptation– Understandability (accents)– Multiple users
Testing Ideas
• Methods– Lazy Susan– Waveform Comparisons– Speech to text translation
• Metrics– Noise level– Noise source– Microphone orientation– Accuracy
Project Management
• Schedule– Mid project review: 4/12/2007– Initial prototype: 4/25/2007– Final Design Review: 5/3/2007
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
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