Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1977-08-22
1979-03-20
Britton, Howard W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
324 77R, 324 88, 358139, H04N 962, H04N 702, H04N 718, G01R 1322
Patent
active
041457064
ABSTRACT:
This invention concerns a circuit arrangement for visually representing a horizontal frequency coupled input signal on the picture screen of a video display device such as a domestic television receiver. This is achieved by comparing the input signal to be represented in visual form with a vertical frequency sawtooth signal, the comparison being effected in such manner that a further signal is produced which identifies the moments when the two compared signals are equal. The further signal is then used directly or indirectly to control the brightness of the picture screen of the video display device.
The further signal may be a pulse form signal with the leading flanks of the pulses corresponding to moments when the input signal crosses the sawtooth signal upwardly and the trailing flanks corresponding to the moments when the input signal crosses the sawtooth signal downwardly. The further signal is preferably differentiated prior to application to the display device.
REFERENCES:
patent: 3337684 (1967-08-01), Sadler
patent: 3787618 (1974-01-01), Cook
patent: 3958269 (1976-05-01), Davis
patent: 4058826 (1977-11-01), Schneider
Hess Heinz
Peth Horst
Britton Howard W.
Robert & Bosch GmbH
Striker Michael J.
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