Arrangement for dpcm-coding of video signals

Abstract From the Canadian patent

An arrangement for DPCM-coding of video signals. A DPCM coder wherein estimated values (s) are respectively subtracted from digitized picture element signals (s) and the estimated errors are used for signal transmission after quantization and coding. Every estimated value (s) is derived from a reconstructed picture element signal formed in an adder. A limiter between the first adder and the subtractor that reduces the calculating speed can be removed from the timecritical path in that the limiter function is distributed onto two paths that calculate in parallel. A subtraction of the signal taken at the adder output occurs in the one path; the subtraction of an upper or lower limit value …