MACROVISION - A system which allows live viewing of movies and other programmes but prohibits back-to-back copying. Particularly important in the new digital era since the quality of recordings is indistinguishable from the original.
MAGNETIC POLARISER - A polariser controlled by an electrical current from a satellite receiver.
MATV - Master Antenna Television
MCPC - Multiple Channel per Carrier
MDU - Multi Dwelling Unit (eg. Block of flats, hotels or hospital.
MECHANICAL POLARISER - A polariser controlled by electrical pulses from the receiver.
MHEG - Multimedia and Hypermedia Experts Group. The MHEG standard defines an object-oriented model for the presentation of multimedia applications. Used for interactive services and digital teletext.
MODEM - Some Freeview adapters like the Netgem i-player feature a modem, enabling you to use the internet through your TV.
MODULATOR - An output terminal on the receiver or video tape recorder, for connection to the TV by means of aerial cable.
MPEG - Moving Picture Experts Group. Refers to the family of digital video compression standards and file formats developed by the group. Used as the standard to transmit DTT pictures.
MULTI-SATELLITE SYSTEM - Where a specialised receiver in conjunction with a motorised dish, receives signals from the series of satellites in the Clarke belt.
MULTIPLEX - A single data stream used to transmit several Freeview channels at once. Most use the 16QAM (Quadrature Amplitude Modulation) transmission standard to increase chances of reception. However a few (such as those containing the ITV channels) still use the more interference-prone 64 QAM
MULTIPLEX OPERATOR - Broadcaster transmitting on one or more multiplexes.
MUX - Short for multiplex, which holds more than one digital station on a single frequency. Normally achieved using TDM.