Automatic tint circuit for flesh tone correction

Abstract

Abstract A CIRCUIT FOR PROVIDING NATURAL LOOKING FLESH COLOR IN A COLOR TELEVISION RECEIVER IS DISCLOSED HAVING AT LEAST TWO PRIMARY COLOR AMPLIFIERS THEREIN COMPRISING A VIEWER ACTUABLE SWITCH, FIRST MEANS RESPONSIVE TO ACTUATION OF THE SWITCH TO CHANGE THE GAIN OF AT LEAST ONE OF THE AMPLIFIERS, AND SECOND MEANS RESPONSIVE TO THE ACTUATION OF THE SWITCH TO CHANGE THE INPUTOUTPUT PHASE SHIFT OF AT LEAST ONE AND GENERALLY BOTH OF THE AMPLIFIERS. THE SWITCH IS EFFECTIVE IN ONE POSITION TO BYPASS AN I MPEDANCE WHICH IS COMMON TO BOTH AMPLIFIER CIRCUITS AND THUS RENDER THEM INDEPENDENT WHILE THE ANOTHER POSITION IT FUNCTIONS TO INSERT THIS COMMON IMPEDANCE MAKING THE AMPLIFIER CIRCUTS'' PHASE SHIFT BEHAVIOR INTERDEPENDENT. IN THIS OTHER POSITION THE SWITCH ALSO FUNCTIONS TO ADD ADDITIONAL RESISTANCE IN PARALLEL WITH AN EXISTING TRANSISTOR EMITTER CIRCUIT RESISTOR TO THEREBY CHANGE THE RELATIVE GAINS OF THE AMPLIFIER STAGES.

Inventors

• 👤 C Perry

Bibliographic Details