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34
The lowest three octaves of the audio band.
Low bass is the bottom octave (20-40Hz), mid-
bass is the middle octave (40-80Hz), and upper
bass is the 80-160Hz octave.
Bluetooth
A short-range wireless protocol that is meant
to allow mobile devices to share information
and applications without the worry of cables or
interface incompatibilities. The name refers to a
Viking King who unied Denmark. Operates at
2.4 GHz. For more information, see bluetooth.
com.
C
CBR(constantbitrate)
With CBR the encoder spends the same
amount of bits on each frame, regardless of
how much it may really need. Disadvantage
of CBR: Bits are wasted in case of absolute
blackness of a picture or complete silence in an
audio frame. And pictures or audio frames with
a lot of elements may need those bits.
CD(CompactDisc)
Format developed by Phillips, Sony, and Pioneer
for conveying music and data. CDs record
information by deforming the inner metal foil
on the disc with tiny micro pits burned in by a
laser.
CDDB
A centralized database of CDs, CD tracks, and
artists on the Web, now known as Gracenote.
The audio player or burner program can log on
to CDDB. It uploads the ID of the CD being
played, and then downloads the title, artist, and
track list.
Coaxial
A single copper conductor, surrounded with
a layer of insulation, covered by a surrounding
copper shield and nally, an insulating jacket.
An unbalanced transmission line with constant
impedance. In audio, this type is commonly used
for low level, line signals terminated in RCA
connectors.
13 Glossary
A
AAC(AdvancedAudioCoding)
An audio compression scheme dened as part
of the MPEG-2 standard (also known as MPEG-
2 AAC or MPEG-2 NBC, or Not Backwards
Compatible). It offers better sound and a
compression ratio that is superior by roughly 30
percent compared to the MPEG-1 MP3 format.
AC(alternatingcurrent)
An alternating current is an electrical current
whose magnitude and direction vary cyclically,
as opposed to DC (direct current), whose
direction remains constant. The usual waveform
of an AC power circuit is a sine wave, as this
results in the most efcient transmission of
energy. However certain applications use
different waveforms, such as triangular or square
waves.
Amplier
A device, either a single stage or a large scale
circuit with multiple stages for creating gain, i.e.
it makes small signals larger.
Antenna
A device, such as a rod or wire, which picks up
a received radio frequency signal or radiates a
transmitted RF signal.
Audio output
High-level (speaker) or line-level (RCA) signals
sent from one system component to another;
or the high-level signal from an amplier to the
system speakers.
AUX
Auxiliary input that allows you to connect
portable audio devices.
B
Bass
EN
was6050_ifu_01en_04de_03es_02fr_34 34 2008-02-14 12:40:43 PM