Deemphasis & Subsequent reemphasis of high-energy reversed-spectrum components of a folded video signal

Circuitry for generating a response to a video signal in which the level of higher-amplitude components of said video signal in an upper-frequency band thereof is increased relative to components of said video signal in a lower-frequency band thereof, said circuitry comprising:

• means for separating said upper-frequency band of said video signal;
• a coring circuit for coring the separated upper-frequency band of said video signal, thereby to generate a cored response thereto;
• and
• means for additively combining said cored response with said video signal, thereby to generate said response to said video signal with the level of higher-amplitude components of said video signal in said upper-frequency band thereof increased relative to components of said video signal in said lower-frequency band thereof.

Circuitry for generating a response to a video signal in which the level of higher-amplitude components of said video signal in an upper-frequency band thereof is reduced relative to components of said video signal in a lower-frequency band thereof, said circuitry comprising:

• means for separating said lower-frequency and upper-frequency bands of said signal;
• means for rectifying the separated upper-frequency band of said video signal, thereby to generate a rectified upper-frequency response;
• means for baseline clipping said rectified upper-frequency response for generating a control signal;
• means for generating a multiplier signal having an amplitude that varies in response to said control signal, growing smaller with increase in said control signal and growing larger with decrease in said control signal;
• means for multiplying the separated upper-frequency band of said video signal by said multiplier signal, thereby to generate a product signal;
• and
• means for additively combining said product signal with the separated lower-frequency band of said video signal, thereby to generate said response to said video signal in which the level of higher-amplitude components of said video signal in an upper-frequency band thereof is reduced relative to components of said video signal in a lower-frequency band thereof.