Signals

Signals

1. Electric current

   • Conveys data from one place to another

2. Analog

   • Continuous wave that changes over time
     • Represented by sine waves
       • Amplitude
       • Frequency
       • Phase
   • Not immune to noise

3. Digital

   • Noncontinuous and discrete time signal
     • Bit rate and interval
       • Bit interval = Time
       • Bit rate = Frequency of interval
   • Binary form data
   • Hardly faces a distortion

4. Main differences

   • Analog
     • Continuous wave
       • Sine form
     • Behavior of the wave
       • Amplitude
       • Period
       • Phase
     • e.g
       • Human voice
   • Digital
     • Noncontinuous wave
       • Square form
     • Behavior of the wave
       • Bit interval
       • Bit rate
     • e.g
       • PC Transmission data

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