Dynamically controlled horizontal peaking system

In a television receiver including a source of video signals which are representative of variations of the luminance of an image between black and white extremes during periodic image intervals, and which include, during intervening blanking intervals, deflection synchronizing pulses extending to peaks at a blacker-than-black level, said video signals occupying a predetermined band of frequencies;

• a dynamically controlled horizontal peaking system comprising:
• a peaking system input terminal;
• means, coupled to said source, for delivering said video signals to said peaking system input terminal;
• means, responsive to said delivered video signals, for forming an adjustably cored horizontal peaking signal output, said forming means having a coring level control terminal, with the depth of coring of said horizontal peaking signal output effected by said forming means being dependent upon the level of a potential appearing at said control terminal;
• signal translating means having an input terminal and an output terminal, and exhibiting a low pass characteristic having a cutoff frequency lying below the middle of said band of frequencies;
• a direct current conductive coupling between said output terminal and said control terminal;
• a capacitor coupled between said input terminal of said signal translating means and said peaking system input terminal;
• means for developing a reference potential at a reference terminal;
• a transistor having a base electrode direct current conductively coupled to said reference terminal, an emitter electrode direct current conductively coupled to said output terminal of said signal translating means, and a collector electrode direct current conductively coupled to said input terminal of said signal translating means;
• and
• a signal combiner, responsive to said delivered video signals and to said adjustably cored horizontal peaking signal output, for developing peaked luminance representative signals;
• wherein said signal translating means provides a filtered version of said video signals at said output terminal with a polarity such that said synchronizing pulses extend in a conduction-enhancing direction for said transistor.