Complex Waves
Some waveforms combine the characteristics of sines,
squares, steps, and pulses to produce waveshapes that
challenge many oscilloscopes. The signal information may
be embedded in the form of amplitude, phase, and/or
frequency variations. For example, although the signal
in Figure 9 is an ordinary composite video signal, it is
composed of many cycles of higher-frequency waveforms
embedded in a lower-frequency envelope.