This was because, unlike 1 inch type C which recorded one field per helical scan track on the tape, Type B segmented each field to 5 or 6 tracks per field according to whether it was a 525 ( NTSC ) or 625 ( PAL ) line machine.
42.
In 1963 Philips introduced their EL3400 1 " helical scan recorder, aimed at the business and domestic user, and Sony marketed the 2 " PV-100, their first reel-to-reel VTR, intended for business, medical, airline, and educational use.
43.
The tape advanced steadily, and data was recorded ( or read ) by a cylindrical head rotating at high speed and inclined at a small angle to the direction of tape motion, laying down ( or reading back ) a series of short data tracks very closely spaced together, helical scan.
44.
Employees of Ampex at the time reported that the company kept a VR-8000 hidden behind a wall at the 1960 National Association of Broadcasters convention, kept hidden just in case a competitor showed a helical scan VTR ( they could then reveal the VR-8000 if the scenario arose, as a competing product ).
45.
"' VK "'is a helical scan analog recording videocassette format developed by Akai in the late 1970s, that is capable of recording and playing back black & white ( and later color ) video in either CCIR ( the 625-line PAL video standard for Europe and other parts of the world ).
46.
"' EIAJ-1 "'was a standard for video tape recorders ( VTRs ) developed by the Electronic Industries Association of Japan with the cooperation and assistance of several Japanese electronics manufacturers in 1969 . It was the first standardized format for industrial / non-broadcast VTRs using a Helical scan system employing open reel tape.
47.
The format was called " M " due to the shape of the threading path of the tape around the helical scan video head drum, which resembles a letter M . ( This is also how the U-matic format got its name, for its U-shaped tape path in the VCR . ) VHS also uses the same M-shaped tape threading path as M; it was carried over to M from VHS.
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