5.1 (Surround Sound 5.1)
Surround Sound 5.1 refers to multi-channel
sound systems with five main channels and a
separate low-frequency effect channel. Unlike
Dolby Surround Pro Logic and similar systems,
with 5.1 all six channels are stored and played
discretely, i.e. individually and fully.
AAC (Advanced Audio Coding)
AAC is a file format for lossy storage of audio
data. The format has primarily become known
thanks to its use in a number of music
services, particularly Apple's iTunes®.
Stores the stations with the strongest
reception signal at the present time in the
respective preset memory in order of
A CD-Extra CD is a special multi-session
CD containing exactly two sessions. The
first session contains the "normal" audio
data of the CD. The second session contains
the computer data.
Dolby Digital (also ATSC A/52 and Dolby AC-3)
Dolby Digital is a multi-channel sound system
from Dolby that is used in cinema, on laser
discs, DVDs, and in television.
DTMF tones (Dual Tone Multi-Frequency)
DTMF tones are tones stored on the keypad
that are transmitted by a telephone or mobile
radio equipment in order to communicate with
touch tone-activated telephone systems.
DTMF is used in hotline systems, in mailbox
systems, and in telephone banking, for
DTS refers to a multi-channel sound system
from the Californian company of the same
name (Digital Theater Systems, Inc.) that
is used in cinemas as well as on laser discs,
DVDs, special audio CDs, and D-VHS.
GPS (Global Positioning System)
GPS is a satellite-assisted position tracking
IMEI (International Mobile Equipment Identity)
The IMEI is a serial number that permits unique
identification of the hardware in mobile radio
equipment. Since different network providers
can use this number to block a telephone in
the event of misuse, it is a good idea to keep
a record of it.
The IMEI can normally be displayed on a cell
phone by keying in *#06#.
Meridian Lossless Packing (also Packed PCM or Dolby Lossless)
Meridian Lossless Packing is a lossless
compression standard for digital sound
Mixed Mode CDV (also "Enhanced CD" )
A Mixed Mode CD is a CD containing tracks
of different types (e.g. one data track and
numerous audio tracks).
A generic term for MPEG-1 Audio Layer 3 (a
lossy compression method for audio data).