JPS5518131A - Signal binary coding device - Google Patents

Abstract

PURPOSE: To ensure a high-fidelity reproduction of the original by using the peak value of the signal level at the area corresponding to the information of the analog picture signal as the background level and then setting the threshold level between the background level and the black peak level of the anglog picture signal.

CONSTITUTION: Analog picture signal (f) is applied to the information detection differential binary coding circuit for differentiation, and the differential value is binary coded by the fixed threshold value. Differential binary coded signal (j) is delayed by the fixed time through delay circuit 2a and 2b to produce signals (k) and (l). Then the sample holding is given at sample holding circuit 4b to signal (o) produced by giving the peak holding to analog picture signal (f) for the video gate period via signal (l). Another sample holding is given to signal (p) at sample holding circuit 4b via signal (k). Thus threshold value (s) is set for binary coding circuit 6 at nearly the intermediate position between signal (q) and the black peak level of the analog picture signal obtained through black level peak holding circuit 5.

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