Television receiver including a teletext decorder

Details Television receiver including a teletext decorder Television receiver including a teletext decorder

1989-01-10

1990-03-27

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358142, 340748, 340750, H04N 7087

Patent

active

049125559

ABSTRACT:
In a teletext decoder circuit the character generator supplies picture elements at a rate of nominally approximately 6 MHz under the control of display pulses occurring at the same rate. These display pulses are derived from reference clock pulses which occur at a rate which is not a rational multiple of 6 MHz. The character generator comprises a generator circuit which receives the reference clock pulses and selects, from each series of N reference clock pulses, as many pulses as correspond to the number of horizontal picture elements constituting a character, while the time interval of N reference clock pulses corresponds to the desired width of the characters to be displayed. The character generator supplies picture elements of distinct length, while the length of a picture element is dependent on the ordinal number of this picture element in the character.

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