A high-performance video and audio signal monitoring system has been developed. The system is composed of our newly developed automatic video and audio detector. The new video detector detects not only decrease in the level of synchronous signals, but also failures of video signals such as picture freeze, cut off (black level), and clipping of the black level. The new audio detector detects the DC level in digitalizing process and a silence in the program accurately. Still more video comparetor which compare the two video signals is developed with the method of comparing the each scanning line's characteristics. The new monitoring sysytem is currently in operation and enable us to operate quickly in the case of TV signal trouble, to offer exerent quality picture and sound.
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