本规程旨在提供音频扇区时间码（ASTC）和设备类型信息（ETI）。ASTC可以帮助D-1 DTTR准确读取时间码，尤其是在静止帧条件下。ETI旨在提供记录DTTR的标识。本规程适用于在帧频为29.97 Hz的525线电视系统和帧频为25 Hz的625线电视系统上运行的记录器。

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.