Displaying waveforms
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United States of America Patent
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-
Sep 10, 1985
Grant Date -
N/A
app pub date -
Jan 21, 1983
filing date -
Jan 21, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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