voice recognition hardware development read my lips john porter, lavanya mynam, gerald mortensen
DESCRIPTION
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 PresentationTRANSCRIPT
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