transparent audio coding

audio, compression A lossy audio compression algorithm

is transparent if the original and decoded signal are

indistinguishable to the human ear. The bit rate depends on

the codec and the audio material. Some codecs (e.g. AAC,

MP3) are optimized for transparent coding at a low data

rate, others (e.g. VQF, MP3Pro, AAC+SBR, WMA) for

distinguisable but pleasant reproduction at lower bit rates.

Typical data rates in kbps for different codecs are:

MP1 288-320

MP2 224-256

MP3 160-224

MPEG-2 AAC 128-160

MPEG-4 AAC 112-144

MPEGplus 160-200

(2001-12-23)