MODERN ELECTRONIC SYSTEMS

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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

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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)

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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., and I.F., amplifiers. (ch 13 and 14)

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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.

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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.

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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.

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10
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11
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12
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13
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14
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15
Frequency Spectrum

• Cannel bandwidth 6 Mhz
• Picture carrier starts 1.25 Mhz in
• Chroma subcarrier is 3.58 Mhz above P carrier
• Sound carrier is 4.5 Mhz above P carrier
• Vestigial sideband of picture information (LSB)
• Ex. Channel 2 allocation between 54 and 60 Mhz
• Picture carrier as seen by spectrum analyzer
  is at ____.
• Chroma signal is seen at _______.
• Sound carrier is at _________.