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MODERN ELECTRONIC SYSTEMS

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Digital signal processing fundamentals. Video and audio compression techniques ... What is the role of a sawtooth signal relative to a sync pulse? ... – PowerPoint PPT presentation

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Title: MODERN ELECTRONIC SYSTEMS


1
MODERN ELECTRONIC SYSTEMS
  • Analog and Digital Television Broadcast Systems
  • Analog and Digital Television Receiver Systems
  • Analog and Digital Audio Systems
  • Digital signal processing fundamentals
  • Video and audio compression techniques
  • Digital modulation principles and schemes
  • Satellite television

2
Order of Analog Television Topics
  • Television broadcast fundamentals (ch.1)
  • Composition of video baseband signals (ch1
    notes)
  • Scanning principles (ch.1)
  • Analysis of one horizontal line (notes)
  • Analysis of vertical blanking interval. (ch.1)
  • Television receiver fundamentals. (ch.2 block
    diagram)
  • Vertical deflection circuits. (ch.7)
  • Horizontal deflection circuits. (ch.8)

3
Order of Analog Television Topics (cont.)
  • Horizontal output and high voltage. (ch.10)
  • Sync circuits. (ch9.)
  • Chroma circuits and systems. (ch 15. and 16.)
  • Tuners . (ch.12)
  • Video R.F., I.F., and amplifiers. (ch 13 and 14)

4
T.V. Broadcast Principles
  • Composite video signal
  • T.V. broadcast block diagram
  • T.V. Broadcast Standards NTSC
  • 21
    interlace
  • 2
    fields/frame
  • 262
    1/2 lines per field
  • 525
    lines per frame
  • 60
    fields per second

  • therefore ____ frames per sec.

5
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6
Scanning principles
  • Why must fields and frames change or switch at
    appropriate locations?
  • How is an image lock achieved?
  • Synchronization pulses determine where LINES and
    FIELDS switch.
  • What is the role of a sawtooth signal relative to
    a sync pulse?
  • Proportional electromagnetic field strength must
    be developed in the magnetic deflection mechanism
    in order to achieve correct placement of an
    electron beam.

7
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8
Scanning Principles contnd.
  • What is a Yoke?
  • A CRT assembley must receive several voltages
    1.) deflection 2.) signal and 3.) high voltage
  • After each line is scanned we have horizontal
    retrace. What time duration does this correspond
    to?
  • After each field is scanned we have vertical
    retrace. What time duration does this correspond
    to?
  • The FLYBACK portion of the sawtooth waveform that
    is developed also relates to this time frame.

9
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10
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12
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14
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