Apparatus and method for reducing quantizing distortion

DETAILED DESCRIPTION This invention is a method and apparatus for passing quantized electronic signals of a given quantizing resolution through processing systems which have a quantizing accuracy less than that which the electronic signal is quantized to.
The invention includes truncating the quantized signal to a given precision matching the precision of the processing system, which truncation is effected by simply discarding the lower significance portions of the quantized signal to provide a truncated quantized signal, offsetting means to offset the truncated quantized signal by a predetermined amount, normally equal to the level of the lowest significance portion of the quantized signal, and a pattern means to control the offsetting means to perform said offset in a predetermined and predictable manner.
In digital video versions of the invention, the pattern means generates one of 2.
sub.
T offsetting patterns in response to the T truncated lower significant bits of the digitized video signal.