The Analog Continuous Waveform
As shown, there is no absolute value within the wave—it varies as the
strength of the signal increases or decreases.This introduces one of the primary
problems with analog systems, because one must consider the introduction of
static and amplification in the waveform.To illustrate this, consider Figure 1.4.
Note that the waveform is now comprised of higher highs and lower lows,
and spikes of noise have slightly altered the waveform.The receiver will perceive
this as a change in pitch, volume, and tone, and, should this degradation continue
through multiple amplifiers and noise-prone circuits, the original waveform may
be so disrupted that communications is impossible.