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Tele- communication

Tele- communication. Means communication at distance. Not a New Idea. Early developments for passing messages. The modern era. The phone. Changes to the phone. Basic physics. Waves. Longitudinal: sound. Transverse : em spectrum. Key terms. Wave interference. Reflection.

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Tele- communication

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  1. Tele-communication Meanscommunication at distance

  2. Not a New Idea

  3. Earlydevelopmentsforpassingmessages

  4. Themodern era

  5. Thephone

  6. Changes to thephone

  7. Basic physics

  8. Waves Longitudinal: sound Transverse: emspectrum

  9. Key terms

  10. Wave interference

  11. Reflection

  12. Refraction

  13. Total internalreflection

  14. Opticalfibre

  15. Whyreplacecopper

  16. Signals

  17. Satellitetransmission

  18. Attenuation • Over a distancetheenergy in a signalisdissipated as it spreads out so thesignal at anyonepointgetsweaker. • Thisiswhyweneedphone, tv and radio masts to boostthesignals. • Imagine as youmoveawayfrom a light source in thenight – itseffectgetsless. Itisjustthesamewithradiowaves and microwaves.

  19. Electromagneticspectrum

  20. EM spectrumtelecommunication

  21. A bit of physics • V = λx f • Where v = velocity • λ = wavelength • f = frequency • In the case of emspectrum v iscalled c as in Einstein´sfamousequation • E = mc² • C = 3 x 108 m/s • Rearrangetheequation to findthefrequency of 15 cm microwaves.

  22. Thismeans

  23. Types of signal

  24. Practicaldifference Analogue Digital

  25. Benefits and disadvantages of analogue Benefit Disadvantage Loosesinformation • Allowsmuchgreaterinfo. storage • Easier to reproduce • Easier to send and transport

  26. Doesitmatter?

  27. e.g. film • A movingpictureismade up of 24 stillframes a second • Oureyes use thisdiscreteinformation and ourbrainperceivesit as ifwewerelooking at movement in normal life. • Conversely digital allowsusnow to projectmany more frames per secondgivingmuchgreaterresolutione.gphantom cameras.

  28. Challenge: A poster

  29. Rubric

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