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DESIGN AND DEVELOPMENT OF MEDICAL ELECTRONIC ...

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254 SIGNAL SOURCES FOR SIMULATION, TESTING, <strong>AND</strong> CALIBRATIONFigure 6.4 Just as in a graphic equalizer, the basic shape of the waveform generated by this arbitrarysignal generator tracks the shape described by a bank of linear slider potentiometers.40msRMidpointLinear Slider Potentiometer PositionBaselineS0S1PS2S3QS4S5S6SS7S8TS9S10S11S12S13S14S15 = S0BaselineFigure 6.5 The P–QRS–T complex can be reconstructed from 14 analog samples. One more sampleis needed to represent the isoelectric baseline level between the end of the T-wave and the startof the P-wave. Each step would last 40 ms, which requires a sampling clock frequency of 25 Hz. Thetrigger clock frequency needs to be 1 Hz to simulate a rate of 60 beats/min.

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