Piece-wise linearized waveform generator for scan velocity modulation circuit

A video display deflection apparatus, comprising:

• a source of a video signal;
• means for producing a deflection field that varies a position of an electron beam on a screen of a cathode ray tube;
• a source of periodic, first signal that varies in accordance with the variation in said position of said electron beam in a horizontal direction;
• a source of periodic, second signal that varies in accordance with the variation in said position of said electron beam in a vertical direction, said second signal being combined with said first signal to produce a combined signal that varies in accordance with said first and second signals;
• and
• a limiter responsive to said combined signal for generating a third signal having a limited, piece-wise linearized first portion, when said combined signal is outside a range of values, said third signal having a second portion that varies, when said combined signal varies within said range of values, said third and video signals being coupled to said deflection field producing means to vary said position of said electron beam.

A video display deflection apparatus, comprising:

• a source of a video signal;
• means for producing a deflection field that varies a position of an electron beam on a screen of a cathode ray tube;
• a source of a periodic, first signal that varies in accordance with the variation in said position of said electron beam in a horizontal direction;
• a source of a periodic, second signal that varies in accordance with the variation in said position of said electron beam in a vertical direction;
• and
• means responsive to said first and second signals for generating a piece-wise linearized third signal that varies in accordance with said first and second signals, said video and third signals being coupled to said deflection field producing means to produce scan velocity modulated deflection of said electron beam.