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Video signal blanking circuit with noise suppression - uses FET to receive blanking control signal, and is combined with storage capacitor
申请公布号：DE2913854(A1)
申请号：DE19792913854
申请日期：1979.04.06
申请公布日期：1980.10.23
发明人：HEITMANN,JUERGEN,DIPL.-ING.
分类号：H04N3/24;(IPC1-7):04N3/24;04N5/18
主分类号：H04N3/24
摘要：<p>The circuit has an input stage (2) with a low-ohnic output resistance coupled to a sample-and-hold circuit (3, 4) supplied with a blanking control signal (A), such that during the blanking interval the last received amplitude value of the video signal is retained. Pref. the video signal is supplied to one input of a difference amplifier (2), with feedback to its opposite input, its output coupled to the drain (D) of a FET (3). This receives the horizontal blanking control input at its gate (G), its source coupled to earth via a storage capacitor (4) and to the positive input of an amplifier output stage (6) with a high ohmic input resistance.</p>
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