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VOB is a format for DVD files that are usually stored in the VIDEO_TS folder. VOB is based on MPEG-2 and it can contain video, audio, subtitles and other data. Each file should be less than 1 GB to be compatible with all operating systems, otherwise they will not be read.

Continuously Variable Slope Delta modulation is a voice coding method. It is a delta modulation with variable step size (adaptive delta modulation), first proposed by Greefkes and Riemens in 1970