MODULATION

Communications Systems Glossary

Communications Systems — Modulation

 

 

 

 

 

 

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Information on Modulation

The shifting or translation of a signal from one frequency band to another is accomplished by the process of modulation. In this process, the baseband signal is impressed in some way on a carrier signal at a higher frequency such that one or more of the characteristics of the carrier signal are altered. In this manner, baseband frequencies are translated in frequency up to the carrier frequency. The three characteristics of the carrier signal that can be altered are the amplitude, the frequency and the phase.The three corresponding CW modulation methods are: amplitude modulation (AM), frequency modulation (FM) and phase modulation (PM).


Other topics in our resources on Communications Systems related to Modulation include: 
 
  • Amplitude modulation (AM)
  • angle modulation
  • frequency modulation (FM)
  • phase modulation (PM)
  • single sideband (SSB)
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  • independent sideband (ISB)
  • upper sideband (USB)
  • lower sideband (LSB)
  • Spread spectrum
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  • Demodulation
  • Amplitude-shift keying (ASK)
  • Frequency-shift keying (FSK)
  • Quadrature amplitude modulation (QAM)
  • Phase-shift keying (PSK)

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