VHS FORMAT (VHS = IEC 774 / VHS-C = IEC 1077)
Introduced soon after Betamax, the Video Home System format has become the dominant consumer standard. For camcorders, the VHS-C concept was introduced, using a smaller cassette which can be used with an adaptor in a full-size machine. The Hi-Fi version buries a longer wavelength FM audio carrier under the short wavelength video in the depth of the tape coating to escape the limitations of longitudinal audio tracks at low tape speeds.
|Analogue, composite, 'Colour under'.|
|No. of rotating heads||2 *|
|Video track angle||5.96||degree|
|Type||Cobalt modified oxide or chromium dioxide|
|Thickness (total)||21.0 (max)||µm|
|Shelf volume||120 (E-240)||cm³/h|
|Sync tip carrier frequ.||3.8||MHz|
|Chroma s/c||0.627 **||MHz|
* More heads are sometimes provided for improved slow-motion etc.
** Strictly fsc = (44fn + 1,953) Hz.
VHS-C IEC 1077