Manual

Chapter 11 - Glossary
Redbox User Handbook 11-3
LAN Local Area Network - scheme where several computers on the same
premises are connected together so that they can exchange data.
LCD Liquid Crystal Display (grey displays e.g. on calculators).
LED Light Emitting Diode (small lights e.g. on computers).
LNB Low Noise Block - the RF amplifier attached to a satellite dish.
MCR See racks room.
MDU Mains Distribution Unit - a panel of mains outlets for power distribution.
MF Medium Frequency - another name for Medium Wave - roughly
frequencies between 300kHz and 3MHz.
MHz Mega-hertz - One million cycles per second.
Mix-minus A mix-minus is similar to a cleanfeed except that the caller’s voice is
removed from the signal electronically. Due to phasing problems at the
signal band edges, the mix-minus method often produces a lower grade
signal.
Mono Monophonic sound (system of broadcasting, recording or reproducing
sound) using only one channel between source and loudspeaker.
MP3 MPEG 1 Layer 3 - see MPEG.
MPEG (ISO MPEG) Motion Picture Experts Group. For audio, this is used to
refer to a framing format standard. There are several layers and
variants. Most common ones are listed below.
MPEG 1 Layer 1 Used for Digital Compact Cassette.
MPEG 1 Layer 2 (Musicam) used in digital radio, digital terrestrial
television, ISDN and many hard-disk storage systems.
MPEG 1 Layer 3 Known as MP3. A more elaborate version of MPEG 1
Layer 2 that allows for audio stoarge using low bit-rates.
MSF This is radio code signal sourced from Rugby in England, which can be
used to automatically synchronize the Sentinel+ audio logger and PC
time to an accurate atomic clock, UK Time.
Musicam Masking Pattern Universal Sub-Band Encoding.
MUX Short for Multiplex - a 'package' of digital radio services.
Pan This controls the levels sent to the left and right outputs and is an
abbreviation of 'panorama'.
PFL (Pre Fade Listen, or Cue). This is a method of auditioning audio material
independently of the programme output, without routing the signal to
air. The PFL button on each channel routes the signal to the PFL bus,
where it can be monitored.
PI Code (RDS) Programme Information Code used to identify an FM RDS station.
PPM Peak Performance Meter (BBC Specification).
Promo Something used to promote a product.
PS Name (RDS) Programme Service Name - 8 characters used for naming an FM RDS
station.
PSU Power Supply Unit.
PTY (RDS and DAB) Programme Type. A code transmitted to describe the
overall programme content of a radio station (Static PTY) and/or the
moment by moment content (Dynamic PTY). RDS has 32 codes
although 3 are used in special circumstances only.
Racks Room Often called the Master Control Room (MCR) or Central Apparatus Room
(CAR), the racks room is an engineering area containing studio routing
to transmitter equipment. Outside sources, phone-in equipment, off-air