Transcript Voice Activated Compartmentalized Safe Preliminary Design Review

Designing a Voice Activated
Compartmentalized Safe with
Speech Processing using Matlab
Final Presentation
Amy Anderson
Ernest Bryant
Mike Joyner
Collins Pratt
December 7, 2007
Georgia Institute of Technology
ECE 4007 Senior Design
Objective and Motivation
• Provide accessible and secure valuables storage
for multiple users
• Demonstrate functionality without implementing
safe construction standards
• Fulfill niche in voice security implementation in
personal safes
• Market towards homeowners and small
businesses
Project Description
• Cylindrical device
• Allows multiple storage
compartments for each
user
• Voice and password
protected
• Automated process for
opening and closing
Initial Design Objectives
• Build a wooden cylindrical compartmentalized safe
prototype
• Allow access to each compartment through specific, user
programmed voice password
• Develop Matlab program capable of identifying and
verifying two specific speakers
• Develop GUI to allow user to easily configure and operate
safe
• Interface computer and microcontroller through Matlab and
serial cable
• Use microcontroller to control stepper motor that rotates
safe top
Block Diagram of Safe Prototype
Software Design Overview
• Used Matlab for recognition algorithms and GUI
• Used assembly language for microcontroller
program
• Speech processing algorithms used:
– Mel Frequency Cepstral Coefficients
– Vector Quantization Codebook
Software Design Diagram
Password To Open
System
pass_box.m
Store Word
Features & Assign
Compartment
Compare Recorded
Features With
Stored Features
sgui1.m
sgui3.m
Change and Save
Passwords
pw.m
Allow Password
Entry to Manually
Open Safe
Lock Out System
backup.m
Pass_box.m
Send Correct
Compartment #
Through Serial Port
Allow For User to
Chose
Compartment
run1.m
user1.m, user2.m
Send Correct
Compartment #
Through Serial Port
run1.m
Physical Design Modifications
• Stepper Motor moved to central location to
eliminate the need for gearing
• Plexi-glass top replaced with foam-board due to
torque limitations
• Compartment added due to construction
configuration
• Microcontroller moved outside device for easier
access while troubleshooting
Software Design Modifications
• Initial password required to access the system
• Separate text passwords created for
compartments 1-3 and 4-6 for backup access
• Both passwords can be changed separately
Current Project Status
Complete Design Objectives:
•
•
•
•
•
•
•
Speaker and word recognition
GUI
Prototype compartment
Matlab linking correctly with microcontroller
Microcontroller turning motor
Backup access password GUI
Reprogrammable database and password function
Overall Project Performance
• User friendly GUI
• System characteristics
• Operational characteristics
• Speaker and word recognition accuracies
User Friendly GUI
•Executing program
initializes password GUI
•User enters preset
password upon first use
Enter Password to enter system
•Password can be changed
after initial system entry
User Friendly GUI
1. Configure compartments to specified word
2.Say item that you want retrieved
3. View the number of words stored
4. Clear all words stored for reconfiguration
5. Change password of first speaker
6. Change password of second speaker
7. Opens compartments with out saying words;
password protected
8. Logs out of program
User Friendly GUI
Enter current password
Enter new password
• Password change GUI
• Allows user to change
password upon entry of current
password
• Each password is changed
separately
User Friendly GUI
Set length of recorded word
Set word for specified Compartment
Set length of recorded word
User Friendly GUI
Enter user Password
Click box corresponding to compartment
• Backup Entry GUI
• Allows access to compartments should an error
occur
• Password protected
System Characteristics
• User can set voice recording time
• User can set and change passwords
• Configured to two users; could be adapted for up
to six
• Backup password for error occurrence
• Initial password to enter system
Operational Characteristics
• Motor powered by 12V DC supply
• Time from word spoken to compartment opened:
6
3
5
2
4
1
Operational Characteristics
Specification
Pause Time
Time to Close
Motor Turn Accuracy
Target
TBD
TBD
97%
Actual
6 sec
1-2 sec
Accurate at 12V
Motor turn accuracy:
– Dependant on amount of voltage supplied
– Slight adjustments sometimes needed
– Unable to determine numerical value
Word Recognition Accuracy
Target
95%
Actual
95%
• 95% when correct word is spoken
• If random word is spoken, one compartment will
still be randomly chosen
• Testing method:
– Each group member programmed one word for
each compartment
– Each member then tested to see if word
spoken would match correct compartment
Speaker Recognition Accuracy
Target
Actual
90 - 95% 91%
• Testing method:
– Each group member programmed 3 passwords
– Used same 3 words for each member
– After all words programmed, each member
tested to see if their compartment would be
picked correctly
• Experienced a few problems differentiating
between speakers with similar voices
characteristics and accents
Final Cost
Parts Pricing
PARTS COST
Microcontroller w/ LCD interface
Unipolar Step Motor
Wood
Steel
Mini Linux Computer
DSP Chip
Serial Cable
15V DC Power Supply
Foam Board
Screws, Bolts, Wires, Etc
Packaging
TOTAL PARTS COST
PROTOTYPE
$126
$32.49
$50.00
N/A
N/A
N/A
$39.99
$17.40
$2.00
$10.00
N/A
277.88
FINAL
PRODUCT
$126
$32.49
N/A
$78
$99
$2.65
$39.99
$17.40
N/A
$10.00
$5
410.53
Retail estimate for final product: $1300
$168 profit for each unit sold, 12.9% profit
Future Work
• More sophisticated speech processing algorithms
for better voice security
• Safe meets NFPA and UL standards
• LINUX box for stand alone capability
• Reed switches to increase motor accuracy
• Software streamlining
• Fix reprogramming problem