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.

1. Television
(An Insight)
Presented By: Hafiz Farhan

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. Analog TV
• analog circuit components
• Signal were processed in analog form
• e.g.:
• Picture Tube
• Filters
• Antenna
• Controls

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. 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
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. 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. Modulation of
Analog Signal
(AM & FM)

9. Modulation of
Digital Signal
(AM & FM)

10. Note
• So we can see that both Signals are received in analog form

11. Components of a
television system
(Analog)

12. Components of a
television system
(Analog)

13. Components of a
television system
(Analog)

14. Components of a
television system
(Analog)

15. Components of a
television system
(Analog)

16. Components of a
television system
(Analog)

17. Components of a
television system
(Analog)

18. Components of a
television system
(Analog)

19. Components of a
television system
(Analog)

20. Components of a
television system
(Analog)

21. Components of a
television system
(Analog)

22. Components of a
television system
(Analog)
These are the
image intensities
at different
regions

23. Components of a
television system
(Analog)
These signals act
as coordinates
signal for the
image

24. Analog TV (CRT / Picture Tube)
Design of circuits, protocols
and formats may vary
country wise

25. Thus, a “composite video signal” contains:
1. Intensity information
2. Horizontal retrace
3. Vertical retrace

26. Digital TV (LEDs, LCDs)
Basic Block Diagram of Digital TV

27. Digital TV (Block Diagram)

28. Digital TV Block Diagram

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