本标准规定了19 mm D-2型螺旋扫描电视记录器中包含视频、音频和辅助数据的磁带上形成螺旋记录的数据块的内容、格式和记录方法。此外，本标准第4条规定了纵向记录的内容、格式和记录方法，纵向记录包含与螺旋记录相关的扫描头跟踪信息。轨道尺寸和位置在ANSI/SMPTE 245M中规定。本标准适用于在525中运行的记录器- 标称帧频为29.97 Hz且符合ANSI/SMPTE 244M的有线电视系统。录制一个视频通道和四个独立的音频通道。音频通道按照ANSI S4操作。在标称48 kHz采样频率下为40。图1和图2显示了记录器中涉及的流程框图。

This standard specifies the content, format, and recording method of the data blocks forming the helical records on the tape containing video, audio, and ancillary data in the 19-mm type D-2 helical-scan television recorder. In addition, clause 4 of this standard specifies the content, format, and recording method of the longitudinal record containing tracking information for the scanning head associated with the helical records. Track dimensions and locations are specified in ANSI/SMPTE 245M.The standard applies to recorders operating in the 525-line television system with a frame frequency of 29.97 Hz nominal and in accord with ANSI/SMPTE 244M. One video channel and four independent audio channels are recorded. Audio channels operate in accord with ANSI S4.40 at a nominal 48-kHz sampling frequency. Figures 1 and 2 show a block diagram of the processes involved in the recorder.