DEVICE AND METHOD FOR CATV MONITORING

摘要

PROBLEM TO BE SOLVED: To improve reliability in the switchover of an N+M redundant configuration by objectively monitoring the final output of a head end.SOLUTION: A CATV monitoring device includes: selection means (TS DEMUX DESCR 14) for sequentially selecting a plurality of programs superposed on a carrier wave; demodulation means (MPEG-2 DECODER 15) for demodulating a program selected by the selection means; extraction means (video monitoring unit 17) for extracting a frame which configures a video from the program demodulated by the demodulation means; and detection means (resolution monitoring unit 17) for comparing all image data in at least two frames or partial image data having the same positional relationship belonging to the same program extracted by the extraction means in different timings, to detect an abnormality in the video.