The needle of the speed-indicator flicked and wagged to and fro; the cinders rattled on the roof, and a whirl of dust sucked after the whirling wheels, The crew of the combination sat on their bunks, panting in their shirt- sleeves, and Cheyne found himself among them shouting old, old stories of the railroad that every trainman knows, above the ...
One of the main drawbacks to a digital TV signal or digital cable signal, for instance, is that it is an artificial reproduction of the original data, whereas an analog signal starts out as an exact copy of the original.
QRS Complex- This image on the EKG tracing is actually made up of three. waves. The Q wave is the first negative deflection (below the isoelectric line), the. R wave which is the first upward or positive deflection, and the S wave which is. the next negative deflection immediately after the R wave.