Fig. $2$ ECG showing several beats.

The problem with the $T$ wave for measuring heart rate is that if I tried to use a level crossing detector $($imagine a horizontal line near the top of the R wave$)$ to measure heart rate, it would not work if the T wave's height was almost the same as the $R$ wave, or even larger than the $R$ wave.

One way is to overcome this problem is to use filters. The first part of this question is based on what you see in Table $9-4($see the beginning of the test for this table$).$ What filter $($type$,$ cutoff frequency and first or second order$)$ would you use, so that you could detect the R wave and not have the T wave interfere with the level detection. You need to justify your answer, and I would expect a few paragraphs.

The second question is based on how would you rectify this problem in the time domain, using terms such as differentiation vs$.$ integration, rise time or fall time, slew rate, etc.$).$ Again, I would expect a few paragraphs

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$12ptvv$ Paragraph