SMPTE RP 181-1999 (Archived 2004)

This practice is intended to provide an audio sector time code (ASTC) and an equipment type information (ETI). The ASTC can assist the D-1 DTTR to accurately read time code, especially under still-frame conditions. The ETI is designed to provide identification of the record DTTR. This practice applies to recorders operating on the 525-line television system with a frame frequency of 29.97 Hz and the 625-line television system with a frame frequency of 25 Hz.