Question

Power Line Hum is responsible for most of common-mode interfering signal.

(a) True

(b) False

The question was posed to me in homework.

My question is based upon Measurement of Hearing topic in division Audiometry of Biomedical Instrumentation

Answer 1

Right choice is (a) True

For explanation: It is True. Power Line Hum is responsible for most of common-mode interfering signal. This is suppressed by a notch filter following the input amplifier. A sizable common-mode signal manages to pass through the input amplifier, a circumstance to be expected whenever electrodes spaced a few centimetres apart are attached to the human body in a hospital environment.