| 摘要 |
FIELD: television engineering; television signal processing devices. ^ SUBSTANCE: proposed device designed to automatically enhance contrast of television picture performs following functions: automatic gain control of video signal; automatic enhancement of television picture contrast; analog-to-digital conversion of video signal. Device has clock generator 1, freeze unit 4, amplifier 5, reference-voltage unit 3, resistive voltage divider 6, comparator unit 7, peak detectors 2, 11, and gating unit 12. ^ EFFECT: extended dynamic range of device. ^ 1 cl, 3 dwg |
