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Hardware and Software Optimization of BABSMOM System

Research Progress Seminar. Hardware and Software Optimization of BABSMOM System. FIR Filter. s1150072 Yumiko Kimezawa. Outline. Digital filter FIR filter Why is an FIR filter used ? Structure of an FIR filter Data flow diagram Future work. External Memory. P = # mV Q = # mV

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Hardware and Software Optimization of BABSMOM System

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  1. RPS Research Progress Seminar Hardware and Software Optimization of BABSMOM System FIR Filter s1150072 Yumiko Kimezawa

  2. Outline RPS • Digital filter • FIR filter • Why is an FIR filter used ? • Structure of an FIR filter • Data flow diagram • Future work

  3. RPS External Memory P = # mV Q = # mV R = # mV S = # mV T = # mV U = # mV Interval = # ms ADC 1 FIR 1 ECG Signal Analysis Buffer ADC 12 FIR 12 1:Signal reading 2:Filtering 3:Analysis 4:Display LED Graphic LCD JTAG UART Virtual External Memory Raw ECG/EKG Data ROM LED Controller Graphic LCD Controller Slave CPU Slave CPU Memory Timer FIR Filter Shared Memory Timer Master CPU Master CPU Memory PPD Module Master Module

  4. Digital filter RPS • Digital filter • Mathematical processing to digital signal • Noise rejection • Waveform extraction There are two main types of a digital filter are • FIR filter • Finite Impulse Response filter • IIR filter • Infinite Impulse Response filter This ECG/EKG system uses an FIR filter.

  5. FIR filter RPS FIR filter • One of the ways to configure a digital filter • A liner phase • an oscillation does not happen • Inherent stability • a distortion of waveform does not happen • Impulse response is finite

  6. Why is an FIR filter used ? RPS The data from analog/digital converter is finite and discrete digital signal. This ECG/EKG system use FIR filter.

  7. Structure of an FIR filter RPS An FIR filter is shown by the following difference equation. : Input signals : Output signals It shows the way to process signals. : Filter order : Filter coefficient

  8. Data flow diagram RPS The FIR filter is composed of three parts. Figure: The basic block diagram for an FIR filter of N order.

  9. Data flow diagram RPS Delay element - temporal delay - delay signal for one clock for sampling

  10. Data flow diagram RPS

  11. Data flow diagram RPS Multiplier - multiply filter coefficient by an input signal

  12. Data flow diagram RPS

  13. Data flow diagram RPS Adder -Add output result from all multiplier

  14. Difference equation RPS An FIR filter is shown by the following difference equation. : Input signals : Output signals : Filter order : Filter coefficient

  15. Future work RPS • Understand current ECG Algorithm • Pam Tompskins • Understand new algorithm developed last year • Period-Peak Detection (PPD) Algorithm

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