SYSTEM FOR TRANSMITTING A VIDEO SIGNAL WITH SHORT RUNS AVOIDED IN A SIGNAL ENCODED FROM THE VIDEO SIGNAL

摘要

Abstract of the Disclosure:In an encoder responsive to a video signal variablebetween high and low levels, a logic converter logically convertsa succession of result signals, derived from the video signalby the use of a predetermined number of halftone threshold levels,into a sequence of converted signals having that run length oflogic "0" or "1" level which is longer than that in the resultsignal succession. The converter may comprise a combination ofadders and memory elements to process the consecutive result signals.The converted signal sequence is encoded by an encoding circuitinto a data-compression digitized signal. In a decoder for decodingthe digitized signal into a reproduction of the result signalsuccession, a logic inverter comprises a combination of addersand memory elements, similar to that of the converter. The inverterprocesses, into the reproduction, signals derived from data-expansiondecoding of the digitized signal. Preferably, a dither matrixis used to provide the threshold levels.