Black level control circuit for a television receiver utilizing a sync peak keyed agc circuit
阅读：155发布：2023-03-09
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1. A BLACK LEVEL CONTROL CIRCUIT FOR A TELEVISION RECEIVER WHICH UTILIZES A CATHODE-RAY TUBE FOR PURPOSES OF IMAGE REPRODUCTION, COMPRISING: MEANS FOR SUPPLYING A VIDEO SIGNAL HAVING ALTERNATINGCURRENT COMPONENTS AND A DIRECT-CURRENT COMPONENT REPRESENTATIVE OF AVERAGE SCENE BRIGHTNESS WHICH MAY VARY FROM SCENE TO SCENE, AND HAVING A SYNCHRONIZING PULSE LEVEL AND A BLACK LEVEL INTENDED TO CORRESPOND TO BLACK IN THE REPRODUCED IMAGE, SAID SUPPLY MEANS INCLUDING CONTROL MEANS FOR VARYING THE MAGNITUDE OF SAID SUPPLIED VIDEO SIGNAL; MEANS FOR TRANSLATING SAID SUPPLIED VIDEO SIGNAL TO AN INPUT OF SAID CATHODE-RAY TUBE AND TO AN INPUT OF A KEYED AUTOMATIC-GAIN-CONTROL CIRCUIT, WHEREIN SAID TRANSLATION CAUSES THE SYNCHRONIZING PULSE LEVEL OF SAID TRANSLATED VIDEO SIGNAL TO VARY AT THE INPUT OF SAID AUTOMATIC-GAIN-CONTROL CIRCUIT WITH CHANGES IN AVERAGE SCENE BRIGHTNESS; A KEYED AUTOMATIC-GAIN-CONTROL CIRCUIT RESPONSIVE TO THE SYNCHRONIZING PULSE LEVEL OF THE VIDEO SIGNAL TRANSLATED THERETO FOR DEVELOPING AN OUTPUT SIGNAL REPRESENTATIVE OF THE DIFFERENCE BETWEEN SAID SYNCHRONIZING PULSE LEVEL AND A REFERENCE POTENTIAL; MEANS COUPLED BETWEEN SAID SUPPLY MEANS AND SAID AUTOMATIC-GAIN-CONTROL CIRCUIT FOR VARYING SAID REFERENCE POTENTIAL IN ACCORDANCE WITH CHANGES IN THE AVERAGE SCENE BRIGHTNESS OF SAID SUPPLIED VIDEO SIGNAL; AND MEANS FOR COUPLING SAID AUTOMATIC-GAIN-CONTROL OUTPUT SIGNAL TO SAID CONTROL MEANS FOR VARYING THE MAGNITUDE OF SAID SUPPLIED VIDEO SIGNAL TO STABILIZE SAID SYNCHRONIZING PULSE LEVEL AT THE INPUT OF SAID AUTOMATIC-GAIN-CONTROL CIRCUIT, THEREBY STABILIZING BLACK LEVEL AT THE INPUT OF SAID CATHODE-RAY TUBE AND LIMITING THE AMOUNT OF BEAM CURRENT FLOWING IN THE CATHODE-RAY TUBE ON SCENES OF HIGH AVERAGE BRIGHTNESS.
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