M II: A videotape recording system of broadcast standard developed by Panasonic (part of Matsushita). It uses 12.5mm (1/2 inch) metal particle tape for component recording of luminance and colour difference signals on separate tracks. (Trade name.) (Hist.)
machine code: The lowest level of programming for a computer. The individual instructions are in a numeric code, usually in binary or hexadecimal notation. See also object code.
machine room: See apparatus room.
M and D: In motion picture film, masters and dupes.
M and E: Music and effects. A sound track containing music and effects without speech or dialogue.
M&S mic: Middle and side microphone, a combination used for stereo sound recording.
macroblock: In MPEG video data compression, a ...