Comparison of AM and SSB.
(1) The waveforms shown in B and E of figure 2-12 represent stable carrier
frequencies. Parts A and D show audio signals of different frequencies
that are used to modulate the carrier. Parts C and F show the effects
of the modulating signals on the RF carriers. Notice in both C and F
that a positive voltage peak of the modulating signal results in an
increase of frequency, while a negative voltage peak results in a
decrease of frequency.
Also, the higher modulating frequency (D)
causes the carrier to be varied more often than the lower modulating
(2) The waveforms shown in B and E of figure 2-13 show a stable carrier
frequency. Parts A and D show audio signals of the same frequency but
different amplitudes, used to modulate the carrier. In C and F you can
see the effect of the modulating