SMPTE 12M-1-2008

This standard is one of the oldest SMPTE Standards. It was first adopted in 1975, and it has been widely used for many systems outside SMPTE's normal area of purview. It was developed for analog television recording systems and thus dealt only with interlaced television systems operating with frame rates up to 30 frames per second. It is, however, flexible enough in design to be used in digital television systems, both standard definition and high definition. The actual transport of the codewords for digital systems varies significantly from the transport methods defined for analog systems, and is defined in the associated document, SMPTE 12M-2.