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TV (Television) A Brief Depiction of the internal Mechanism

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TV (Television) A Brief Depiction of the internal Mechanism

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Depiction of Internal Mechanism of old analog Television. The also contains a bit of history and types of television along with evolution of television. It is designed from signal processing perspective. The presentation is available in editable format for the convenience.

Depiction of Internal Mechanism of old analog Television. The also contains a bit of history and types of television along with evolution of television. It is designed from signal processing perspective. The presentation is available in editable format for the convenience.

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TV (Television) A Brief Depiction of the internal Mechanism

  1. 1. Television (An Insight) Presented By: Hafiz Farhan
  2. 2. Types of TV • There are two type of TV • Analog Televisions • Used in the old day • Limited functionality • Low cost • Low resolutions • Digital Televisions • TV of modern era with diverse features • Multitasking • Similar cost • High quality
  3. 3. Analog TV • analog circuit components • Signal were processed in analog form • e.g.: • Picture Tube • Filters • Antenna • Controls
  4. 4. Digital TV • It has several advance features and have better quality • Signal are converted in to digital form (ADC) • Digital circuit components are used • RAM • Processor • Clock • Remote Control • LEDs
  5. 5. Protocols • There are certain standards which are followed such as • Video (MPEG, MP4, HDTV, etc.) • Audio (MP3, etc.) • Modulation • Amplitude Modulation • Frequency Modulation • Phase Shift Modulation • etc. • Compression & Decompression • Encoding & Decoding • Others
  6. 6. 6 Monochrome TV Signals (NTSC) • In the NTSC monochrome system the luminance signal is AM/VSB (Amplitude Modulation/Vestigial Sideband) modulated onto the video carrier • The sound signal is FM modulated onto the Audio Sub-Carrier located 4.5 MHz from the video carrier 0 4.5 MHz Video Signal Audio Signal Video Carrier Audio Sub-Carrier
  7. 7. Signal Receiving • First step is to receive the signals • There are various methods to receive the signals • Wireless • Antenna • Dish Antenna • Wifi e.g. Wi-Tribe • Wired • Cable • Internet (IP) e.g. PTCL Smart TV
  8. 8. Modulation of Analog Signal (AM & FM)
  9. 9. Modulation of Digital Signal (AM & FM)
  10. 10. Note • So we can see that both Signals are received in analog form
  11. 11. Components of a television system (Analog)
  12. 12. Components of a television system (Analog)
  13. 13. Components of a television system (Analog)
  14. 14. Components of a television system (Analog)
  15. 15. Components of a television system (Analog)
  16. 16. Components of a television system (Analog)
  17. 17. Components of a television system (Analog)
  18. 18. Components of a television system (Analog)
  19. 19. Components of a television system (Analog)
  20. 20. Components of a television system (Analog)
  21. 21. Components of a television system (Analog)
  22. 22. Components of a television system (Analog) These are the image intensities at different regions
  23. 23. Components of a television system (Analog) These signals act as coordinates signal for the image
  24. 24. Analog TV (CRT / Picture Tube) Design of circuits, protocols and formats may vary country wise
  25. 25. Thus, a “composite video signal” contains: 1. Intensity information 2. Horizontal retrace 3. Vertical retrace
  26. 26. Digital TV (LEDs, LCDs) Basic Block Diagram of Digital TV
  27. 27. Digital TV (Block Diagram)
  28. 28. Digital TV Block Diagram
  29. 29. Comparisons • Digital TVs can store data where as analog cannot do so • Digital TV consume less power than the other • Digital TV Provide High Quality • Heavy signal processing is required in digital TVs as compared to analog TVs

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