1977 - C-FORMAT - Ampex / Sony (IEC 558)
This non-segmented format reflects the third iteration of the SMPTE 25.4 mm helical video recorder standard. Appearing in 1978 this format was designed to provide 'stunt' capabilities such as still-frame, picture-in-shuttle and slow motion that were impossible with 'quad' recorders. C-format was the vehicle for the introduction of AST (auto scan tracking) and the PAL variant was promptly embraced by the EBU.
|Analogue, composite, non-segmented.|
|No. of rotating heads||3 or 6 *|
|Scanner diameter (top)||134.62||mm|
|Video track angle||2.56||degree|
|Sync tip carrier frequ.||7.16||MHz|
* Normal configuration with 3 heads has vertical interval 'dropout' and space for four longitudinal audio tracks. 6 heads option provides continuous recording with space for 3 audio tracks. One variant uses the 'sync' track space for digital audio. IEC 558