Circuit arrangement for adjusting the black level of a video signal
阅读：344发布：2023-03-12
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1. A CIRCUIT ARRANGEMENT FOR ADJUSTING THE BLACK LEVEL OF A COMPOSITE VIDEO SIGNAL AND A CIRCUIT DEVICE, SAID COMPOSITE VIDEO SIGNAL BEING COMPOSED OF PICTURE SIGNAL COMPONENTS HAVING A BLACK-WHITE TRANSITION INCLUDING A NOMINAL LEVEL AND BLANKING COMPONENTS, COMPRISING, IN COMBINATION, MEANS FOR GENERATIG AUXILIARY PULSES REPETITIVE AT THE LINE REPETITION RATE OF SAID VIDEO SIGNAL AN OCCURRING DURING SAID BLANKING COMPONENTS, SAID AUXILIARY PULSES BEING OF THE SAME POLARITY AS SAID PICTURE SIGNAL COMPONENTS AND HAVING AN AMPLITUDE EQUAL TO THE NOMINAL LEVEL OF THE BLACK-WHITE TRANSITION OF SAID PICTURE SIGNAL COMPONENTS; A FIRST MIXER STAGE ADDITIVELY COMBINING TWO INPUT SIGNALS APPLIED TO ITS TWO INPUT LEADS RESPECTIVELY; CONNECTION MEANS APPLYING SAID COMPOSITE VIDEO SIGNAL AND SAID AXILIARY PULSES TO SAID INPUT LEADS RESPECTIVELY OF SAID FIRST MIXER STAGE PRODUCING A FURTHER COMPOSITE VIDEO SIGNAL AVAILABLE AT THE OUTPUT LEAD OF SAID FIRST MIXER STAGE; A GAIN CONTROL CIRCUIT; CONNECTION MEANS APPLYING SAID FURTHER COMPOSITE VIDEO SIGNAL TO THE INPUT LEAD OF SAID GAIN CONTROL CIRCUIT; A SECOND MIXER STAGE ADDITIVELY COMBINING TWO SIGNALS APPLIED TO ITS TWO INPUT LEADS RESPECTIVELY; A PULSES GENERATOR GENERATING A TRAIN OF COUNTER-PULSES COINCIDENT IN TIME WITH SAID AUXILIARY PULSES BUT OF OPPOSITE POLARITY AND OF AN AMPLITUDE CORRESPONDING TO THE NOMINAL LEVEL OF THE BLACK-WHITE TRANSITION OF SAID PICTURE SIGNAL COMPONENTS; CONNECTION MEANS APPLYING THE OUTPUT SIGNAL OF SAID GAIN CONTROL CIRCUIT AND SAID PULSE GENERATOR TO SAID INPUT LEADS RESPECTIVELY OF SAID SECOND MIXER STAGE; A CLAMPED D.C. RESTORING DEVICE; A BLANKING STAGE ADDING BLANKING PULSES TO A SIGNAL APPLIED TO ITS INPUT LEAD; A CONNECTION MEANS APPLYING THE OUTPUT SIGNAL OF SAID SECOND MIXER STAGE VIA SAID CIRCUIT BY WAY OF SAID CLAMPED D.C. RESTORING DEVICE TO SAID BLANKING STAGE PRODUCING A RE-BLANKED COMPOSITE VIDEO SIGNAL; A CLIPPING STAGE HAVING ITS CLIPPING LEVERL FIXEDLY RELATED TO THAT LEVEL AT WHICH THE D.C. LEVEL OF SAID OUTPUT SIGNAL OF SAID SECOND MIXER STAGE IS CLAMPED BY SAID D.C. RESTORING DEVICE; CONNECTION MEANS APPLYING SAID RE-BLANKED COMPOSITE VIDEO SIGNAL TO SAID CLIPPING STAGE.
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