Analog Modulation Methods

n analog modulation, the modulation is applied continuously in response to the analog information signal.

An audio signal (top) may be carried by an AM or FM radio wave.

Common analog modulation techniques are:

• Amplitude modulation
  • Double-sideband modulation DSB
    • Double-sideband modulation with unsuppressed carrier (DSB-WC)(used on the radio AM band)
    • Double-sideband suppressed-carrier transmission (DSB-SC)
    • Double-sideband reduced carrier transmission (DSB-RC)
  • Single-sideband modulation
    • Single-sideband modulation (SSB, or SSB-AM), very similar to
    • single-sideband suppressed carrier modulation (SSB-SC)
  • Vestigial sideband modulation (VSB, or VSB-AM)
  • Quadrature amplitude modulation (QAM)

• Angle modulation
  • Frequency modulation (FM)
  • Phase modulation (PM)