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Now looking at definitions starting with letter "m"

m : milli. Premix meaning one-thousandth of the quantity that follows, e.g., milliseconds (ms), and millimeter (mm).

M : Mega. One million times the quantity that follows, e.g., megabit (Mb), megabyte (MB), and megawatt (MW).

M & E : Music & Effects. The "M" and "E" in DME. A three-track film soundtrack mix, less dialogue, used for foreign voice dubbing. A foreign language film version requires that all sound effects that are otherwise included in the dialog stem are copied across to the effects stem. If these production effects are not clear of dialog, then they must be replaced either by Foley tracks or by cut effects. Once the effects are complete, the track is said to be "filled", thus contracts specify "music and filled effects." Also known as the international version, or mufex. See stem, final mix.

M&E Music and Effects

M&E : Music and Effects.

MACE : Macintosh Audio Compression/Expansion. Lossy audio compression algorithm, included in the Macís system software. It works with 8-bit digital audio files, and supports compression ratios of 3:1 (music) and 6:1 (speech). Resulting audio quality is not the best.

MADI : Multichannel Audio Digital Interface. Sometimes erroneously called the "Musical Audio Digital Interface." A professional multichannel version of AES/EBU standard for transmitting up to 56 channels of digital audio data over a single coaxial cable terminated with BNC connectors . MADI uses a second cable for word clock, with a fixed data rate of 100Mbps used on large, open-reel digital multitracks. Optical MADI implementations are available.

MAF : Minimum Audible Frequency. The lowest line on an equal loudness curve, representing 0dB SPL.

mag : Shorthand for sprocketed magnetic film. Film that contains only sound, but no picture.

mag dubber : A type of sprocketed tape recorder/playback machine device that reproduces one or more audio tracks onto the magnetic area of magnetic film which has a magnetic stripe. A playback-only machine for sprocketed magnetic film, reproducing one or more tracks of sound onto the magnetic area on the film stock. Some mag dubbers which are equipped with dual sets of sprockets can reproduce more than one size of magnetic film, e.g., 16mm and 35mm. See mag-optical print.

mag stripe print : A 35mm or 70mm print with magnetic oxide stripes painted lengthwise down both sides of film, on either side of the perforations. These formats are now obsolete. See print master.

mag-optical print : A motion picture film that has both an optical sound track and magnetic soundtracksound tracks so it can be reproduced in conventional theaters with optical sound equipment and also in houses equipped with stereo magnetic sound.

Magnasync/Magnatech : Two brands of mag dubber sprocketed tape recorders or playback machines. They can be used to transfer a sound source onto magnetic film. These brand names are also used generically to indicate any sprocketed tape recorder or playback unit. See dubberr.

magnetic distortion : A type of distortion in dynamic loudspeakers caused by nonlinearities in the interaction between the magnetic field in the gap and the voice coil.

magnetic film : AudioVideo recording tape manufactured using a base of the same physical film stocks, e.g., 16mm, 35mm, etc., and which contains a magnetic area running longitudinally down the film for the recording of an audio track or tracks. Magnetic film is 3-5 mils thick, so that the same length of film and magnetic film will be of equal diameters when wound on reels. Full-coat magnetic film has magnetic oxide applied across its entire width. Striped magnetic film can have one or more thin stripes of oxide applied longitudinally on the film base. There is usually one (wide) stripe containing a single track of audio (in the same size and location as track-one of a 3-track), while another (smaller) stripe is placed on the opposite side to make the film pack evenly when wound together, usually known as a balance stripe. The balance stripe is sometimes used to record timecode from 1/4 inch or DAT timecoded production masters. Also called mag. Not used since the advent of synchronized audio multitrack recording. See film soundtrack.

magnetic recording tape : Most magnetic tapes have a mylar or polyester base with a thin coat of magnetic material, usually gamma ferric oxide or chromium dioxide, but newer tapes are double-layered which combine the good low-frequency response of ferric oxide and good high-frequency response and low noise of chromium dioxide; the oxide is cured onto the base and the tape is calandered. The metal particles have a random orientation in unmagnetized tape, but they are aligned into definite magnetic patterns by the magnetic field produced by the recording head. If all other factors are the same, the wider the track, the greater the S/N ratio: doubling the track width improves the S/N ratio by 3dB. Professional analog tape recorders are available with tape widths up to 2" and up to 24 tracks. There is a thin guardband of uncoated base tape between the tracks to yield improved channel separation, reducing crosstalk, and providing some tolerance for differences in head/track alignment among machines. See Barkhausen effect, back coating, MOL, bias, domain, extinction frequency, scrape-flutter filter. Magnetic tape has historically come in a number of widths and formats (all denominated in inches):

magneto-optical disk : See MO.

magnetometer : A device for measuring magnetism and magnetic fields. Useful for testing whether or not tape heads need to be degaussed, and also for verifying the magnetic fields generated by unshielded speakers.

magnitude : The portion of the frequency response or impedance of a device that represents the amplitude is called the magnitude, as distinguished from the phase, which is the other part. Precisely, the term magnitude only applies to complex quantities, i.e., quantities characterized by both a magnitude and a phase. For noncomplex quantities, the term amplitude is used.

manual : The keyboard(s) on an organ or harpsichord played by the hands, as opposed to the pedalboard, which is a keyboard played with the feet.

map : A table in which input values are assigned to outputs arbitrarily by the user on an item-by-item basis, used as input to a mapper.

mapper : A device that translates MIDI data from one form to another in real-time. See MIDI mapper.

mark-in/mark-out points : In SMPTE video synchronization and post-production, the SMPTE time code addresses selected by the editor as the beginning and end points of a loop. The synchronizer will stop master and slave transports at the mark-out point after each insert take, then automatically return all machines to the mark-in point in preparation for another take. Various synchronizers automatically add pre-roll and post-roll times to the mark-ins and -outs, so it is important to understand how each unit internally defines all of these locations.

mark/space ratio : See duty cycle.

marry : To print sound and picture onto the same strip of film, as on an answer or release print.

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