Device for Automatic Control of the Magnitude of the Threshold Contrast

摘要

The object of the invention is a device of automatic control of the magnitude of the threshold contrast for photoelectric tracking systems with an amplifier which is distinguished by the fact, that with the purpose of detecting single objects on nonuniform background under conditions of highly variable illumination and insuring automatic control of amplification through partial modulation of the input signal from the background, to the input of the amplifier are connected two photoelement load resistors, the smaller of which is shunted by the contacts of a vibrator. (Author)