This part of IEC 61834 specifies the content, format and recording method of the data blocks forming the helical records on the tape containing audio, video and system data. It describes the specifications for the 1125-line system with a frame frequency of 30,00 Hz (hereinafter referred to as "1125-60 system") and 1250-line system with a frame frequency of 25,00 Hz (hereinafter referred to as "1250-50 system") which are not included in parts 1and 2. One video channel and four independent audio channels are recorded in the digital format.