The filter used to reject the 50Hz noise picked up from power lines or machinery is called?(a) band reject filter(b) band stop filter(c) notch filter(d) all reject filterThis question was addressed to me in an international level competition.I need to ask this question from General Considerations for Signal Conditioners in chapter Recording System of Biomedical Instrumentation

The filter used to reject the 50Hz noise picked up from power lines or

1.	The filter used to reject the 50Hz noise picked up from power lines or machinery is called?(a) band reject filter(b) band stop filter(c) notch filter(d) all reject filterThis question was addressed to me in an international level competition.I need to ask this question from General Considerations for Signal Conditioners in chapter Recording System of Biomedical Instrumentation
Answer» Right CHOICE is (c) notch filter For explanation I would say: Such filters are called notch filters. Almost all MEASURING and recording applications are subjected to some degree of 50HZ noise picked up from the power lines or machinery. Therefore, most signal conditioners include low pass filter designed SPECIFICALLY to provide maximum REJECTION of 50 Hz noise.

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