PPT Slide

Frequency Shift Keying (300-1200 baud modems)

• In frequency modulation , also known as frequency shift keying, two (or more) different tones are used to code bits.

• only 2 frequencies required for binary data

  1: signal transmitted at frequency c+ a
  
  0: signal transmitted at frequency c - a
  
  
  
  
  

0

1

0

1

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