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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 |
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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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