Philips NP2500/05 ユーザーズマニュアル

36

Aux in

Auxiliary 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. 
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). 

C

CBR (constant bit rate)

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 (Compact Disc)

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 

12 Glossary

A

AAC (Advanced Audio Coding)

An audio compression scheme defined 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 efficient 

transmission of energy. However certain 

applications use different waveforms, such as 

triangular or square waves.
Album art

Album art is a feature that displays the 

artwork (cover picture) of a music album. This 

display enables the user to quickly identify 

a music album. The artwork files for music 

albums can be downloaded from the Internet.
Amplifier

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 amplifier to 

the system speakers.

EN