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US 3,946,153 AGranted
System for producing a correction signal for the aperture correction of video signals
AssigneeRobert Bosch Fernsehanlagen G.m.b.H.
InventorsHorst Peth, Gerhard Illetschko
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Abstract
Correction signals for aperture correction of video signals are generated in such a way that the peak values of the correction signal produced in an aperture corrector which are dependent upon the frequency of the video signal to be corrected are maintained constant.
Claims8
A system for producing an output correction signal for aperture correction of video signals, comprising:
- A. a video amplifier having a controllable amplification characteristic and input and output terminals,
- B. an aperture corrector for supplying to the input terminal of the amplifier a correction signal which is dependent upon the time derivative of the video signal from a video source to be corrected,
- C. means for detecting peak values of correction signals at one of the amplifier terminals, and
- D. means for using the detected peak values to control said amplification characteristic for causing the output correction signal to appear with a constant amplitude at the output terminal.
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Dependencies are inferred from the claim text.