Gating signal generator for switched pincushion correction circu

Details Gating signal generator for switched pincushion correction circu Gating signal generator for switched pincushion correction circu

1977-10-11

1979-01-02

Wilbur, Maynard R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315408, H01J 2970

Patent

active

041329279

ABSTRACT:
A switched television pincushion correction circuit uses a controllable switch including an SCR gated at the horizontal deflection rate. The gating signal is a horizontal rate pulse which is duration-modulated at the vertical rate. A gating pulse generator includes a source of rectified mutually inverted vertical sawtooth signals. An offsetting circuit generates from the rectified signals two vertical rate signals offset from each other by a fixed amount. The offset signals are summed and the sum signal is used to modulate a horizontal-rate ramp-on-pedestal signal in order to generate the duration modulated SCR gating signal.

REFERENCES:
patent: 4064406 (1977-12-01), Tiemeijer
patent: 4081722 (1978-03-01), Haferl

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