VIDEO 8 FORMAT (IEC 843)
An embedded track finding and following system avoids the need to read a longitudinal control track at slow tape speed. Very small cassettes are used and the current (type P5-) metal particle tapes offer recording times up to 2h. Thinner metal evaporated tapes are expected to become available which will offer extended times. The format includes 'buried' FM audio recording on a 1.5 MHz carrier and a variety of PCM audio options using 10- to 8-bit companding.
|Analogue, composite video, FM audio, PCM audio.|
|No. of rotating heads||2|
|Video track angle||4.91||degree|
|Coercivity *||1500MP or 950 ME||Oe|
|Type||Metal particle or m. evaporated|
|Thickness (total)||13.0 MP or 10.0? ME||µm|
|Sync tip carrier frequ.||4.2||MHz|
|Chroma s/c||0.732 **||MHz|
* Tape magnetic properties are not stated in the standard; suitability is ascertained
by comparison with reference tapes.
** Strictly 46.875fh. Track 1 has phase continuous chroma s/c, track 2 has phase retarded 90° at every horizontal interval.