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By using a _________ rather than a _________ the amplitude of low frequency noise as well as the low frequency components of the ECG will be reduced without affecting the QRS.(a) High-pass filter, Band-pass filter(b) Low-pass filter, Band-pass filter(c) Band-pass filter, Low-pass filter(d) Band-pass filter, High-pass filterI had been asked this question in an international level competition.I need to ask this question from Phonocardiography (PCG) in chapter Biomedical Recorders of Biomedical Instrumentation

Answer» CORRECT answer is (c) Band-pass filter, Low-pass filter

To explain: The maximum of the QRS energy spectrum is in the vicinity of 10 Hz, the filter is DESIGNED to have a bandwidth of about 15 Hz with a CENTRE frequency of 10-12 Hz. By using a bandpass filter rather than a low-pass filter, the amplitude of low frequency NOISE as well as the low frequency components of the ECG will be reduced WITHOUT affecting the QRS.


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