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FPGA Based Acoustic Source Localization Project
This document presents a final year project on FPGA-based acoustic source localization aimed at determining the position of sound sources using field measurements. It discusses the integration of this technology with video cameras for applications like security surveillance and interactive robotics. The project highlights challenges such as background noise interference and the need for multiple microphones for accurate localization.
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FPGA Based Acoustic Source Localization Project
- 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
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- 7. Signals captured bymicrophones: Time Difference of Arrival (TDOA):
- 15. D = GAIN*((Vin-1.65)/1.25)*8192
- 18. INITIALIZATION RUN ADC RUN FFT INSIDEFFT 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”
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