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Which of the following filter is used to amplify frequency above a certain value?

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Which of the following filter is used to amplify frequency above a certain value?

(a) band stop filter

(b) low pass filter

(c) band pass filter

(d) high pass filter

This question was addressed to me in final exam.

This key question is from Delivery Models in Telemedicine topic in section Telemedicine Technology of Biomedical Instrumentation

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The correct choice is (d) high pass filter

Best explanation: Low pass filter amplifies signals below a certain frequency. High pass filter amplifies signal above a certain frequency. Band pass filter amplifies frequencies within a certain band. Band stop filter amplifies all the frequencies except those in a certain band.

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