11 Glossary
A
AAC (Advanced Audio Coding)
An audio compression scheme defined as part of the
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
AUX
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
Bluetooth
A
2.4GHz. 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
28EN