During the initial noise interval, which statement is true?

During the initial noise interval, which statement is true?

• A. R wave is rectified and R wave is measured
• B. R wave is rectified
• C. R wave is measured
• D. Neither occurs

Answer: (A)

In ECG signal processing, the initial noise interval is used to set up a stable baseline for detecting the true R wave later. Rectifying the signal (taking the absolute value) converts all deflections to the same polarity, so the magnitude of any upcoming deflection can be tracked consistently. At the same time, measuring the R-wave-related peak in that interval provides a baseline value to distinguish noise from a real QRS complex later on. Therefore, both rectification and measurement occur in the initial noise interval, making the statement that the R wave is rectified and measured the best description. Choosing only one of these steps or none would leave you with an incomplete preprocessing setup for reliable R-peak detection.

In ECG signal processing, the initial noise interval is used to set up a stable baseline for detecting the true R wave later. Rectifying the signal (taking the absolute value) converts all deflections to the same polarity, so the magnitude of any upcoming deflection can be tracked consistently. At the same time, measuring the R-wave-related peak in that interval provides a baseline value to distinguish noise from a real QRS complex later on. Therefore, both rectification and measurement occur in the initial noise interval, making the statement that the R wave is rectified and measured the best description. Choosing only one of these steps or none would leave you with an incomplete preprocessing setup for reliable R-peak detection.