Vo Vị (a) 14.2-4 Full Alternative Text
Electrocardiology is the study of the electric signals produced by the heart.
These signals maintain the heart’s rhythmic beat and are measured by an
instrument called an electrocardiograph. This instrument must be capable of detecting periodic signals whose frequency is about 1 Hz (the normal heart rate is 72 beats per minute). The instrument must operate in the presence of sinusoidal noise consisting of signals from the surrounding electrical environment, whose fundamental frequency is 60 Hz—the frequency at which electric power is supplied.
Choose values for R and L in the circuit of Fig. 14.4(a) such that the resulting circuit could be used in an electrocardiograph to filter out any noise above 10 Hz and pass the electric signals from the heart at or near 1 Hz. Then compute the magnitude of Vo at 1 Hz, 10 Hz, and 60 Hz to see how well the filter performs.
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