Electronic Brightness Contouring

An unorthodox circuit technique is described, in which a standard pentode amplifier is operated “below the knee” of the plate characteristic to obtain a reversal of transfer characteristic slope. Projecting selected amplitude increments of a video signal over this reversing characteristic and deleting remaining video portions not in the immediate vicinity of the reversal, results in a signal having “off” response to levels on both sides of the input incremental level and a suprisingly well defined “on” response to the included level. The contour or “outline” signal thus derived may be added to the input signal to form a composite display in which the level of the contour may be continuously varied for observation or analysis.

Print ISSN

0361-4573

Published

1961-01

Content type

Original Research

DOI

10.5594/J14380