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What is included in the system to facilitate playback and study of EMG sound waveforms at a later convenient time?

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What is included in the system to facilitate playback and study of EMG sound waveforms at a later convenient time?

(a) Preamplifier

(b) Oscilloscope

(c) Tape Recorder

(d) Ground Electrode

I had been asked this question in a job interview.

This intriguing question originated from Measurement of Respiration Rate topic in division Patient Monitoring System of Biomedical Instrumentation

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Correct choice is (c) Tape Recorder

To explain I would say: The tape recorder is included in the system to facilitate playback and study of the EMG sound waveforms at a later convenient time. The waveform can also be photographed from the CRT screen by using a synchronized camera.

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