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DESIGNING & IMPLEMENTATION OF DIGITAL FILTER FOR REMOVAL
OF POWER SUPPLY NOISE
Naivedya Mishra(2011H140034H)Peeyush Pashine(2011H140033H)
Pravesh Tamrakar(2011H140036H) M Ashwin(2011H140038H)
BACKGROUND
Use of ECG Records the rhythm and electrical activity of patient
Types of Noise
Power Line Noise Baseband Vendor Noise Muscular Noise
INTRODUCTION
Power Line Noise (50 Hz)
How to get a pure ECG signal
Determine set of filter coefficient to meet a design Specification
Tools used MATLAB,VERILOG…
Introduction(contd.)
Power Frequency Deviation Transition from 50 Hz…
Filter Specifications
Filter Design
Appropriate Filter IIR vs FIR Chebyshev Over Other Filters Chebyshev1 Over Chebyshev2
Filter Design(cont..)
MATLAB Simulations
Ideal ECG Signal
Ideal ECG Signal Filtering
MIT-BIH ECG Signal
Filtering of Signal from MIT-BIH
FFT of Filtered Signal..
..FFT of Filtered Signal..
..Comparison of FFTs
4th order BS - more accurately as compared to other filters
2nd order BS filter & 2nd order Notch filter - similar coefficients and characteristics
Differentiated by computational methods
Inferences from this Section
VERILOG SIMULATION
Process Generation of Verilog code and
corresponding Testbench for filter
Simulation of testbench using Xilinx 13.1
Coded for Spartan 3E(standard).
MAC UNIT
Concept MAC: a <- a+ (b*c)
Coefficients fed from LUT’s
Multiplication in form of recursive addition
Simulation
THANK YOU