Showing papers on "Residual frame published in 1968"

Redundancy reduction system with data editing

Abstract: A redundancy reduction system is described for use with signals such as video signals which have frame-to-frame redundancy. An entire frame of samples from the signal is stored in a frame memory. Each new sample from the signal is compared with its corresponding stored sample having the same time position within the frame. If a significant difference is found to exist between the two samples, the new sample is placed into the frame memory replacing the old sample, and in addition an identification or flag signal is placed into a flag memory at a corresponding address. A searching circuit scans the flag memory and detects those address locations which have been marked by a flag or identification signal. In response to detecting a flag at a particular address location the sample stored in the frame memory at that address location is read out of the frame memory and coupled to a digital transmitter for transmission to a receiving location.