UNIT 1 PREPARATION SHORTS

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 ANALOG MODULATION TECHNIQUES:-

  1. Basic elements of communication system?
  2. Applications of different frequencies in spectrum?
  3. Define modulation ? need for modulation ?
  4. Classification of various modulation techniques?
  5. Difference between base band,carrier,modulated signal ?
  6. Define AM,FM,PM?
  7. Define modulation index ?draw the wave forms for M<1,M=1,M>1 ?
  8. Dffects of over modulation?
  9. Advantages & dis advantages of FM over AM?
  10. Advantages and dis advantages of DSB-SC, SSB-SC?
  11. Define pre-emphasis & de-emphasis with circuits diagrams ?
  12. Advantages of pre-emphasis and de-emphasis ?
  13. Define noise ? effects of noise in communication systems ?
  14. Classification of noise ?
  15. Define signal to noise ration ,noise figure ,noise temperature ?

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