Voice Recognition Hardware Development

standingtopAI and Robotics

Nov 17, 2013 (3 years and 7 months ago)

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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