Our Bachelor's final year project for active localization of a sound source using FPGA, microphones and stepper motor. Simulation was also accomplished on Simulink.

1. FPGA
Based
Acous.c
Source
Localiza.on
Prabin
Maharjan
Prabin
Man
Baidya
Presha
Joshi
Shristi
Nhuchhe
Pradhan
-­‐
Final
Year
Project
Presenta.on
March 18, 2010
Supervisors: Prof. Dr. Dinesh Kumar Sharma
Asst. Prof Jitendra Kumar Manandhar
Internal Examiner: Dr. Nanda Bikram Adhikari
External Examiner: Er. Shiva Raj Baral
Tribhuvan University
Institute of Engineering, Pulchowk Campus, Nepal

2. ! Task
of
locating
the
position
of
sound
source
using
sound
=ield
measurements
! Best
example:
auditory
system
of
human
ear

3. ! Integrating
acoustic
source
localization
with
a
video
camera
so
that
camera
automatically
follows
a
lecturer
or
active
speaker
in
conference
room
! Security
surveillance-­‐
camera
automatically
captures
video
whenever
burglar
makes
sound
! Robotics,
Humanoids

4. Capture
sound
signal
from
source
using
microphones
with
ampli=ication
Detect
sound
signal
and
determine
the
position
of
the
sound
source
Control
the
movement
of
stepper
motor
to
the
direction
of
sound
source

5. HELLO
!!!

7. Signals captured by microphones:
Time Difference of Arrival (TDOA):

15. D = GAIN* ((Vin-1.65)/1.25)*8192

18. INITIALIZATION
RUN ADC
RUN FFT
INSIDE FFT
RUN IFFT
INSIDE IFFT
CALCULATE
DOA
RUN STEPPER
MOTOR
En
ADC=1
Start
FFT=1
Start
IFFT=1
Start
motor=1

24. ! Localizes
the
sound
source
only
in
left
and
right
direction
! Affected
by
background
noise
! Stepper
motor
doesn‘t
react
quickly
to
the
sound
signals

25. ! High
resource
utilization
of
FPGA
board
! Cascading
different
modules
! Different
clock
for
ADC,
stepper
motor
controller

26. ! Using
more
than
2
microphones
for
exact
localization
! Localization
of
acoustic
source
in
3-­‐D
environment
! Multiple
source
detection
! Reducing
the
effect
of
background
noise
and
reverberation

27. ! FPGA
prototyping
by
VHDL
examples,
Pong
P.
Chu
! Industrial
Circuits
ApplicaFon
Note
Stepper
Motor
Basics
! Circuit
Design
Using
VHDL,
Pedroni
! Spartan
3E
user
guide
! “A
comparison
of
the
ILD
and
TDOA
sound
source
LocalizaFon
algorithms
in
a
train
environment”
! “Reliability
measurement
of
Fme
difference
of
arrival
esFmaFons
for
mulFple
sound
source
localizaFon”

28. THANK
YOU!!!

29. QUESTIONS
???