本标准定义了SMPTE ST 12-1中定义的数字垂直间隔（VITC）码字的数字化值的数字数据表示。预期用途为SMPTE ST 125（适用于525线、59.94-Hz场速率、SD数字分量信号）或ITU-R BT.601-7建议和ITU-R BT.656建议（适用于625线、50-Hz场速率、SD数字分量信号）中给出的标准定义（SD）数字编码。

This standard defines the digital data representation of the digitized values of the Digital Vertical Interval (VITC) code words defined in SMPTE ST 12-1. The intended use is with the standard definition (SD) digital coding given in SMPTE ST 125 (for 525-line, 59.94-Hz field rate, SD Digital component signals) or Recommendation ITU-R BT.601-7 and Recommendation ITU-R BT.656 (for 625-line, 50-Hz field rate, SD Digital component signals).