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Developers:

Jeff MacAulay
Mark Law
   

Supervisor:

Dr. Driessen

 

 

Project Description

The online project description is intended to provide the reader with a high-level understanding of the design stages and final system performance. All low-level details can be found within the final report.

Project Motivation
Project Status
System Performance Summary
Order of Progress
User Level Timing Diagram
Block Diagrams
Expenses

Project Motivation

The overall motivation for this project is as follows: an estate with multiple out-building doors, used by multiple users, has only one set of keys to the door locks. SRS was challenged to design some type of hands-free keyless entry system to replace the existing conventional system. Three separate interested parties supplied a budget of approximately $700.00 for any necessary components for the project.

 

Project Status

A proof-of-concept wireless speech recognition entry system prototype was successfully designed. It was proven that users could gain entry to a remote door using voice recognition over 90% of the time. An impressive range of over 220 meters was also proven by successfully recognizing a word five out of five times. Unfortunately, the design will need to be modified significantly before installation at the target site is feasible. This is due to several prototype design shortcomings, such as analog voice transmission, non-hands-free operation, and limited data signalling capability.

 

System Performance Summary

A summary of the characteristics that a potential user would be interested in is given below:

Total Cost*
$320
Additional Satellite Unit(s)
$100
Max Range*
220 m
Number of Users*
15

Notes


1. Listed total cost is central station and single satellite prototype. This cost is high because of low-quantity purchasing.
2. This range is proven which is, as expected, less than our theoreticallink budget calculation of 315m.
3. The number of users can be significantly increased by added external memory if a microprocessor and external memory is added to the speech recognition unit.

 

The table below displays the voice recognition performance at a nominal distance of 50m:

Voice
Jeff
Mark
Lindsey
Jolene
User
Jeff
90%
20%
5%
1%
Mark
15%
95%
1%
0%
Lindsey
2%
2%
92%
22%
Jolene
2%
3%
12%
90%

It can be seen from the above table that the system is not yet perfect. On average it recognizes the user properly 92% of the time, while 7% of the time the system can be fooled with another person's voice. SRS plans to switch to digital transmission of voice which is expected to improve these results significantly.

 

User Level Timing Diagram

A timing diagram is given below to indicate a typical application of a user gaining access to a remote door using wireless speech recognition:

 

 

Block Diagrams
The overall entry system is composed of one central unit and several satellite units (located at remote doors). Block digrams of each sub-system are shown below.

Central Unit Block Diagram

 

Satellite Unit Block Diagram

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Expenses

The following table displays the overall prototyping costs:

Date
Location
Item
Amount
14-May-02

Digi-key

364 Kit

$ 93.59

15-May-02

Queale

Soldering equip.

41.21

27-May-02

Queale

Misc parts

11.85

28-May-02

Digi-key

speak/mic/misc

66.96

30-May-02

Digi-key

oscill/misc

50.18

07-Jun-02

Digi-key

tx/rx/antennas

162.88

16-Jun-02

Digi-key

connectors/op-amp

46.87

20-Jun-02

ZAP

transparancy

3.21

19-Jun-02

Queale

PCB supplies

43.85

19-Jun-02

Albrite

UV light bulb

18.27

26-Jun-02

Digi-key

audio amp/misc

30.3

24-Jul-02

Staples/Uvic

Poster Supplies

18.93

Total

588.10

 

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