Full exam for Biomedical Signal Processing and Medical Images in the Biomedical Engineering degree programme at Politecnico di Milano. The document covers: EXERCISE 1 We are interested in the design of an Analog to Digital conversion system to record an ECG signal for clinical diagnosis of atrial fibrillation a) Draw the block diagram of the A/D conversion system which can adequately record the signal. For each stage report the
Full exam for Biomedical Signal Processing and Medical Images in the Biomedical Engineering degree programme at Politecnico di Milano. The document covers: EXERCISE 1 We are interested in the design of an Analog to Digital conversion system to record an ECG signal for clinical diagnosis of atrial fibrillation a) Draw the block diagram of the A/D conversion system which can adequately record the signal. For each stage report the
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EXERCISE 1 We are interested in the design of an Analog to Digital conversion system to record an ECG signal for clinical diagnosis of atrial fibrillation a) Draw the block diagram of the A/D conversion system which can adequately record the signal. For each stage report the numerical values. Moreover, report and motivate the chosen sampling frequency value. ECG Band 0.05-200 Hz for diagnostic application. Analogue filter is a low pass anti -aliasing filter (LPAA). A LPAA is a filter used before a signal sampler to limit the bandwidth of a signal in order to properly apply the sampling theorem. LPAA 𝑓𝑓 𝑐𝑐𝑐𝑐𝑐𝑐 is chosen to be equal to 220 Hz (10% margin), to limit the corresponding bandwidth of the signals. A/D: Shannon theorem fulfilled so that 𝑓𝑓𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠≥ 2𝑓𝑓𝑠𝑠𝑠𝑠𝑚𝑚, where 𝑓𝑓𝑠𝑠𝑠𝑠𝑚𝑚 is the equal to the highest frequency content among the previously described signal (after proper limiting the band of the signal). In this context, we choose 𝑓𝑓𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠= 500 Hz. 𝑓𝑓𝑁𝑁𝑁𝑁𝑁𝑁𝑐𝑐𝑠𝑠𝑠𝑠𝑐𝑐= 250 Hz. Quantization is defined upon the signal dynamic and quantization level employed, in terms of bits. For example, we may consider an ADC with FSR equal 5 V and 12 bits. As an example, considering ECG dynamic range approximately equa l to 60 mV each level of quantization q is equal to 5 𝑉𝑉 4096 ≃ 1 × 10−3𝑉𝑉= 1 𝑚𝑚𝑉𝑉 following a proper amplification of the recorded signal. At this point ECG signal is discrete in terms of both time and amplitude. b) Sketch a 5 -seconds duration trace of the signal you acquired. Report units and numerical ranges on the axes. 5 seconds of the signal you ac quired at poi nt a) means that x axis must report the scale in SAMPLES so 5 sec * fs = N of samples c) Design a filter to remove baseline wander in the acquired signal. Which kind of filter is…
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