Shaped parabolic signal for deflection correction

Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits

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Details

315389, 348746, 348806, G09C 104, H01J 2970, H04N 323

Patent

active

056335660

ABSTRACT:
A deflection waveform correction signal generator comprises a multiplying circuit for generating a pincushion correction signal. A horizontal frequency ramp is generated by a clipped retrace pulse. The ramp generator has an output coupled to an integrating circuit for generating a parabolic shaped signal. The ramp generator and ramp integrator are reset at a horizontal rate by reset pulses of differing duration. The different duration of reset pulses results in the parabolic signal having regions of non-parabolic shape. The parabolic shaped signal is coupled to an input of the multiplying circuit. A control circuit is coupled to the parabolic shaped signal for maintaining a peak amplitude thereof by controllable coupling to the ramp generator. A control loop is coupled to the integrator for controlling an integrator input bias current to generate the parabolic shaped signal at a predetermined time interval.

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Application Serial No. 08/287,695, filed Aug. 9, 1994, Art Group 2602, Projection Television Apparatus, Examiner: N. West.

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