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

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