The main object of this part of IEC 61834 is to establish basic principles applicable to the next generation of digital video cassette recording systems for consumer use for the interest of both users and manufacturers. 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 the "1125-60 system") and the 1250-line system with a frame frequency of 25,00 Hz (hereinafter referred to as the "1250-50 system") which are not included in parts 1 and 2. One video channel and four independent audio channels are recorded in the digital format. Each of these channels is designed to be capable of independent editing. The video channel records and reproduces a component television signal in the 1125-60 and 1250-50 systems. In part 3, the data structure of a track is defined by APT = 000b which consists of four areas as described in 4.3.2 in part 1 and AP1 = AP2 = AP3 = 000b. The data structure of MIC is the same as clause 10 in IEC 61834-2.