Deflection frequency

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The deflection frequency is the line and frame rate of tube monitors.

The pictures are usually written line by line on picture tubes . The number of lines written per unit of time is called the horizontal deflection frequency. The vertical deflection frequency describes the number of images per unit of time.

Within television sets with picture tubes, a tilting part with the horizontal and vertical deflection frequency is required, the output signal of which is routed to deflection coils on the picture tube.

In Europe, the line frequency is 15,625 Hz, the vertical deflection frequency 50 Hz. With the interlacing process  , each image is transmitted as two fields, so that the image frequency here is only 25 Hz. This means that only 25 images have to be transmitted, but 50 fields are presented to the eye, which greatly reduces flicker. The method halves the required transmission bandwidth with similar quality.

literature

  • Helmut Röder, Heinz Ruckriegel, Heinz Häberle: Electronics 3rd part, communications electronics. 5th edition, Verlag Europa-Lehrmittel, Wuppertal, 1980, ISBN 3-8085-3225-4