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Explain HDTV compatibility. Give the HDTV slandard for 1250 line and 1125 line?
written 7.8 years ago by gravatar for teamques10 teamques10 ★ 70k •   modified 6.4 years ago
tv and video engineering
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written 7.7 years ago by gravatar for teamques10 teamques10 ★ 70k •   modified 6.5 years ago

Compatibility:

  • HDTV is a new high definition system but there are lots of standard definition TV sets with the existing users of TV system.
  • The compatible transmission uses a format which is compatible with the conventional TV receiver and it is augmented by an additional information for displaying full quality HDTV on the HDTV receiver.
  • HDTV receiver have a reverse compatibility, it means they can easily display the transmission having standard quality.
  • Adapter used for format conversion could be costly or very costly depending on the quality of standard TV set used for HDTV reception.
  • The new HD TV receiver should have a backward compatibility they must be able to receive the existing conventional signals.

Diagram:

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1125 Lines standard:

Sr. No. Parameters Typical Values
1. Number of scanning lines 1125
2. Aspect Ratio 16:9
3. Interlaced Ratio 2:1
4. Active Lines 1035
5. Number of frames/sec 60
6. Line frequency 33.75 KHz
7. Luminance signal(Y) 20 MHz
8. Wideband color signal 7 MHz
9. Narrowband color signal 5.5 MHz

1250 Lines standards:

Sr. No. Parameters Typical Values
1. Number of scanning lines 1250
2. Aspect Ratio 16:9
3. Scanning 1:1 progressive
4. Active Lines 1152
5. Field frequency 50 Hz
6. Line frequency 62.5 KHz
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