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8 Cards in this Set

  • Front
  • Back
modulation
converts a digital computer signal into a form that can travel down an ordinary analog telephone line (e.g.: analog to digital, etc); carry waves
forms of modulation
◦ Amplitude modulation
◦ Frequency modulation
◦ Phase modulation
◦ Quadrature amplitude modulation (QAM) -- combines amplitude and phase modulation
Amplitude Modulation (AM)
frequency stays the same, but amplitude changes
amplitude
the intensity of the signal.
◦ Loud (1) or soft (0)
Frequency Modulation (FM)
amplitude stays the same, but frequency changes
frequency
number of complete cycles per second; measured in Hertz - kHz, MHz, GHz, THz; higher frequency = shorter wavelength
Phase Modulation (PM)
signals can have same frequency & amplitude, but different phases; be at different points in cycles at a given moment; harder to understand than FM & AM, but sensitive to equipment
Quadrature Amplitude Modulation
uses 2 carrier waves -- sine and cosine (90 degrees out of phase) -- both amplitude modulated