SMPTE 367M

SMPTE 367M

SMPTE 367M, also known as SMPTE D-11, is the SMPTE standard for HDCAM. The standard specifies compression of high-definition digital video. D11 source picture rates can be 24, 24/1.001, 25 or 30/1.001 frames per second progressive scan, or 50 or 60/1.001 fields per second interlaced; compression yields output bit rates ranging from 112 to 140 Mbit/s. Each D11 source frame is composed of a luminance channel at 1920 × 1080 pixels and a chrominance channel at 960 × 1080 pixels. During compression, each frame's luminance channel is subsampled at 1440 × 1080, while the chrominance channel is subsampled at 480 × 1080, meaning 3:1:1 chroma subsampling. HDCAM supports recording at 24 FPS for film production applications, but it can be configured for television production. Similar to MPEG IMX, the helical scan head drum is 80 mm in diameter. The helical tracks read by the video heads in the drum, are 22 μm wide. The video heads have a 15.25° azimuth. Audio is also recorded on the helical tracks.