Supervision equipment for amt. of software use - enforces limit of use for copying of high-vol. storage media by degradation of output video signal when limit is exceeded

摘要

Video data frames encoded and compressed according to MPEG standards are decoded and extended successively in an expansion circuit (11a). After each expansion of a single frame, this circuit delivers a signal to a host control CPU (14) which counts the signals received and decrements the content of a book-keeping data store (8). When the content falls to zero the CPU delivers symbol pattern image data which are superimposed on the video signal by an addn. circuit (19).