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36
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
Auxiliar
y input that allows you to connect
portable audio devices.
B
Bass
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.
BestBuy®
BestBuy® is a membership-based digital music
ser
vice that allows listeners to subscribe to
music through the Internet at a monthly rate,
rather than to purchase the music.
Bit / bits
A
bit is a binary digit, taking a value of either 0
or 1. For example, the number 10010111 is 8
bits long.
Bit rate
Bit rate is the number of bits that are conveyed
or
processed per unit of time. The bit rate is
usually measured in some multiple of bits per
second (kilobits per second: kbps). The term
bit
rate is a synonym for data transfer rate (or
simply data rate).
Bluetooth®
Bluetooth® is 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.
Oper
ates at 2.4 GHz. For more information, see
bluetooth.com.
15 Glossary
A
A (Amp/Ampere)
The Ampere (abbreviations: Amp or A) is the
unit
of electric current, or amount of electric
charge per second.
AAC (Advanced Audio Coding)
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 (alternating current)
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
ener
gy. However certain applications use
different waveforms, such as triangular or square
waves.
Album art
Alb
um art is a feature of the WAC7500 that
displays the artwork (cover picture) of a music
alb
um. This display enables the user to quickly
identify a music album. The artwork les for
m
usic albums can be downloaded from the
Internet.
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.
Analog audio
Sound
that has not been turned into numbers.
Analog sound is available when you use the
AUDIO LEFT/RIGHT. These red and white jacks
send
audio through two channels, the left and
right.
Glossary
English
EN
wac7500_um_01eng.indd 36 14-08-08 16:29:58
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