Signals

Signals

1. are information converted into suitable forms

   • so that transmission media can accept
     • Electrical signal (telephone line)
     • Light (fibre optics)
     • Radio wave (radio, TV)
     • Micro wave (cellphone, satelite

2. Analogue VS Digital

3. Periodic VS Aperiodic

   • For periodic: Sinusoidal VS Complex
     • For complex e.g. triangle, square, sawtooh

4. Representations

   • Time domain
     • Description of signal in respect of time
     • Instrument: Oscilloscope
       • Display amplitude vs time
         • aka signal waveform
   • Frequency domain
     • Description of signal in respect of frequency
     • Instrument: Spectrum analyzer
       • Display amplitude vs frequency
         • aka frequency spectrum

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