A signal format in which the signal matrix representing the picture contents consisting of the luminance and the two color-difference signals modulated on a colour subcarrier are digitised in the matrixed form as a single data stream. SMPTE 244M describes a digital composite television signal interface for 525-line/59.94 field/sec television systems. Specifications for digital magnetic video tape recording of composite digital video of 525-line or 625-line structure are grouped into the D2 VTR standards. For 525-line, sampled at 14.32 MHz, the specifications are SMPTE 245M, 246M, 247M, 248M, EG 20, and RP 155. An index to the specifications for D2 is SMPTE EG 22.