Also known as D11, this series of Sony VTRs, introduced in 1997, was based on the Betacam principles for recording HD video on a tape format which uses the same style of cassette shell as Digital Betacam, although with a different tape formulation. The technology supports 1080-line standards. Various methods are used to reduce the video data including pre-filtering, DCT-based intra-frame compression and sampling at around 3:1:1. Together these provide data reduction of between 7 and 10:1. Four non-compressed audio channels sampled at 48 kHz, 20 bits per sample, are also supported. One variation, CineAlta, is aimed at addressing the needs of digital cinematography.

HDCAM SR, introduced in 2003, was a further extension of Betacam recorders using mild MPEG-4 Studio Profile (SP) intra-frame compression to store full bandwidth 4:4:4 HD RGB 1080- and 720-line video offering more headroom for digital cinema users, as well as 4:2:2 Y,Pr,Pb component video for television. It offers video data rates of 440 Mb/s and 880 Mb/s, and more audio channels. It can cover SD, HD and film-resolution data (10 or 12 bit), and color resolution (component or RGB). The Sony F950 camera provided suitable RGB sources for HDCAM SR, including undercranked (shooting at a lower than normal framerate) footage. The close-to-raw-state of RGB material is suited to the needs of digital cinematography as the full latitude and bandwidth of the pictures is preserved through recording.

See also: 24PsF, CineAlta, D11

Website: www.sonybiz.net/hdcamsr