Importance

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Abstract

The field rate of a video input signal is doubled by storing each field in a memory and recovering each stored fields twice so as to repeat each field and thus reduce flicker. To ensure that even fields overlay even fields, odd fields overlay odd fields and that all pairs of even and odd fields are interlaced, a timing unit provides a double field rate read control signal to the memory having a waveform that repeats on a two-field basis and supplies a double field rate vertical control signal to a vertical deflection generator having a waveform that is phase modulated and that repeats on a four-field basis. The vertical deflection generator has a constant retrace time and employs DC coupling, thereby avoiding raster shift which otherwise could occur as a result of the phase modulation.

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First Claim