DPCM video signal compression and transmission system and method

摘要

A DPCM video transmission system includes an encoder comprising a single PROM having as its inputs an input video signal and a feedback signal connected to the PROM via a digital latch clocked to produce one pixel delay in the signal. The PROM is preprogrammed with a table comprising all the possible DPCM encoded output signals and feedback signals for each possible pair of input signals according to the preselected quantization characteristics. Similarly, a decoder for receiving the compressed signal and reconverting it into an expanded video signal comprises a single PROM preprogrammed with a table of all the possible reconstructed values, the PROM having as its inputs the compressed signal and a delayed output signal coupled to the input via a latch clocked to produce one pixel delay in the signal. This technique can be used for any selected video signal length, quantization levels and associated ranges, as long as a PROM with sufficient storage capacity for the generated tables is available.