Helical-scan compressed digital video cassette system using 6,35 mm magnetic tape. Format D-7. Compression format|Electronic equipment and components, Data representation, Helical shape, Acoustic signals, Control systems, Cassettes (magnetic tapes), Data compression, Digital recording methods, Recording equipment components, Video signals, Data blocks, Video tape recorders, Magnetic recording, Digital signals, Recording systems, Data structures, Magnetic tapes, Recording tracks, Signal processing, Video recording, Helical scan recording