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BETAMAX (Video = IEC 767) (FM Audio = IEC 1053-1)

This was the first standardised consumer video cassette format. Most recorders for Europe have offered a single tape speed, whereas versions for the USA offered several speeds from the outset. The format uses azimuth and 'colour under' (i.e LF sub-carrier conversion) recording techniques.

Signal system
Analogue, composite, 'colour under'.
Scanner
Geometry Helical
No. of rotating heads 2 *
Scanner diameter 74.487 mm
Rotation speed 25 rev/s
Tracks/revolution 2
Head-to-tape speed 5.83 m/s
Video track angle 5.02 degree
Track width 33.0 µm
Track pitch 33.0 µm
Azimuth ±7.0 degree
Tape Properties
Coercivity 650 Oe
Type Cobalt modified oxide or chromium dioxide
Width 12.65 mm
Thickness (total) 25.0 (max) µm
Tape Consumption
Linear 18.70 mm/s
Areal 0.014 m²/min
Shelf volume 166(L-500) cm³/h
Electrical Characteristics
Sync tip carrier frequ. 3.8 MHz
Peak white 5.2 ** MHz
Chroma s/c 0.688 ** MHz
Shortest wavelength 1.12 µm

* More heads may be provided for improved slow motion etc.
** Strictly, peak white = 5.2 MHz and (5.2 MHz+fh/2) on alternate tracks. Also fSc=(44 ±Vs)f^ on alternate tracks.

IEC 767 FM Audio IEC 1053-1

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