1) Japanese invention
Found on
https://www.crosswordclues.com/clue/helical-scan
Helical scan is a method of recording high frequency signals on magnetic tape. It is used in reel-to-reel video tape recorders, video cassette recorders, digital audio tape recorders, and some computer tape drives. == Comparison to linear tape recording == In a fixed tape head system, magnetic tape is drawn past the head at a constant speed. The h...
Found on
http://en.wikipedia.org/wiki/Helical_scan
A method of recording video information on a tape that increases the 'density' of recorded information on tape, when compared with linear recording. It is used commonly in both home and professional VCRs.
Found on
http://www.zoo.co.uk/~z0001325/Glossary.html
No exact match found.
