Philips MCI300/12 用户手册

28

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. 
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 unified Denmark. Operates at 

2.4 GHz. For more information, see bluetooth.

com.

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 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 finally, an insulating jacket. 

An unbalanced transmission line with constant

impedance. In audio, this type is commonly used

11 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.
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.
AUX

Auxiliary input that allows you to connect

portable audio devices.

EN