Signal adaptive beam scan velocity modulation

A deflection system, comprising:

• means for generating a deflection signal adjustable in amplitude responsive to a video signal component;
• means for modulating beam scan velocity of
• an electron beam responsive to said deflection signal;
• and,
• means for generating an amplitude control signal for adjusting said amplitude of said deflection signal in a manner indicative of variation of frequency content of said video signal component.

A deflection system, comprising:

• means for differentiating and adjusting in amplitude a luminance component of a video signal;
• first means responsive to said amplitude adjusted, differentiated luminance component for modulating beam scan velocity of an electron beam;
• and,
• second means responsive to said amplitude adjusted, differentiated luminance component for generating a signal indicative of the frequency content of said luminance component for controlling said amplitude adjusting.

A deflection system, comprising:

• means for generating a deflection signal adjustable in amplitude and indicative of a derivative of a video signal component;
• means for modulating beam scan velocity of an electron beam responsive to said deflection signal;
• and,
• means for generating an amplitude control signal for adjusting said amplitude of said deflection signal in a manner indicative of a derivative of said deflection signal.

A deflection system, comprising:

• means for modulating beam scan velocity of an electron beam responsive to a deflection signal indicative of the frequency content of a video signal component;
• differentiating and integrating means for generating an amplitude control signal having a first rate of change responsive to an increase of high frequency content of said video signal component and a second rate of change, different from said first rate of change, responsive to a decrease of said high frequency content;
• and,
• means for variably amplifying said deflection signal responsive to said amplitude control signal.

A deflection system, comprising:

• means for generating a deflection signal for modulating beam scan velocity of an electron beam responsive to a first derivative of a component of a video signal;
• a feedback circuit for generating a correction signal indicative of the rate of change of said deflection signal;
• and,
• means for variably amplifying said deflection signal responsive to said correction signal, said feedback circuit having a sufficiently large time constant relative to level transitions of said video signal component that said deflection signal corresponds to said first derivative of said video signal component independent of said variable amplification.