Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Cathode ray
Patent
1983-01-21
1985-09-10
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Cathode ray
364487, G01R 1320
Patent
active
045409382
ABSTRACT:
An apparatus for generating a video signal suitable to cause a representation of repetitive waveform to be displayed on a raster scan display device comprises a differential amplifier which forms an output signal representing a clipped version of the instantaneous difference between the voltage of the waveform and a voltage representing the position of the raster scan line then being executed. An absolute value circuit receives the output signal of the differential amplifier and generates an output signal representing the absolute value of the output signal of the differential amplifier with respect to a reference level. The absolute value signal is inverted and level shifted, and is amplified so that its excursions are of predetermined magnitude.
REFERENCES:
patent: 2565839 (1951-08-01), Broadwell et al.
patent: 4471348 (1984-09-01), London et al.
Karlsen Ernest F.
Smith-Hill John
Tektronix Inc.
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