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....http://www.google.fr/patents/US5528112?utm_source=gb-gplus-shareBrevet US5528112 - Deflection correction signal generator
