Digital video signal processor with distortion correction

Abstract

An apparatus for compensating for signal distortions in an input digital signal, such as a pseudo video scan line having a television video scan line format and capable of comprising a complete self-contained packet of digital information sufficient to provide an entire video displayable row of video data characters, said signal comprising a plurality of ones and zeroes defining the digital information therein, the pseudo video scan line having associated peak-to-peak signal levels respectively defining the ones and zeroes wherein the signal distortion in the signal comprise the respective peak-to-peak signal levels associated with at least some of the plurality of ones and zeroes differing from the respective peak-to-peak signal levels associated with others of this plurality, the peak-to-peak signal levels resulting from zero-to-one and one-to-zero transitions in the signal, provides a compensated output digital signal from the distorted input digital signal having the same information content wherein the plurality of ones and the plurality of zeroes comprising the compensated output digital signal all have the same respective peak-to-peak signal levels varying about a common base level. The compensating apparatus comprises means for tracking both the zero-to-one and the one-to-zero transitions in the input digital signal operatively associated with means responsive to both the zero-to-one and one-to-zero transitions for providing the compensated output digital signal in which all ones and all zeroes are of the same respective levels.