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180-line television system

From Wikipedia, the free encyclopedia

A 1933 photo of Telefunken's FE-II,[1] a combined 180-line TV and radio receiver
A 1933 photo of Telefunken's FE-II,[1] a combined 180-line TV and radio receiver

180-line is an early electronic television system. It was used in Germany after March 22, 1935, using telecine transmission of film, intermediate film system, or cameras using the Nipkow disk. Simultaneously, fully electronic transmissions using cameras based on the iconoscope began on January 15, 1936 with a definition of 375-lines.

The Berlin Summer Olympic Games were televised,[2] using both closed-circuit 375-line fully electronic iconoscope-based cameras and 180 lines intermediate film cameras[3] transmitting to Berlin, Hamburg, Munich, Nuremberg and Bayreuth via special Reichspost long distance cables in August 1936. In Berlin, twenty-eight public 180-line television rooms were opened for anybody who did not own a television set.

System details:[4]

System Field frequency Active picture Field blanking No. of broad pulses Broad pulse width Line frequency Front porch Line sync Back porch Active line time Video/syncs ratio
180-line 25 Hz 169 lines 11 lines 1 per field 200 μs 4500 Hz 2.2 μs 20.0 μs 2.2 μs 197.8 μs 75/25

Some TV sets for this system were available, like the French Grammont models,[5] Telefunken FE II[1] and FE III[6] or Fernseh Tischmodell[7]

After February 1937 both 180 and 375-line systems were replaced by a superior 441-line system.

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Transcription

References

  1. ^ a b "Telefunken Prewar Sets". www.earlytelevision.org.
  2. ^ Larrasa, Miranda (2016). The Olympic Museum (ed.). "Broadcasting the Olympic Games, the Media and the Olympic Games - Television Broadcasting" (PDF). Olympics. p. 4.
  3. ^ "Berlin Olympics Television 1936".
  4. ^ "R.T.Russell: Colour Test Card Generator". bbcbasic.uk.
  5. ^ "Grammont Prewar Sets". www.earlytelevision.org.
  6. ^ "Gerolf Poetschke's Site Telefunken FE III". www.earlytelevision.org.
  7. ^ "Gerolf Poetschke's Site Fernseh Tischmodell". www.earlytelevision.org.

External links

This page was last edited on 24 June 2022, at 07:35
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