ATRAC
ATRAC (Adaptive TRansform Acoustic Coding) is an audio compression algorithm used to store information on Minidiscs, developed by Sony. It uses quadrature mirror filters[?] and modified discrete cosine transform to represent encoded audio.
Two stacked QMF split the signal into 3 parts:
No joint stereo encoding.
Data rate is ...
Double play time, only mono.
Three stacked QMF split the signal into 4 parts:
Joint stereo encoding.
132 kbps (yes, 15% below ATRAC SP/2)
Similar to ATRAC-3 LP-2, but 66 kbps (half the datarate of ATRAC-3 LP-2).
Low quality, similar to MP3 at 80...96 kbps.
see also: Lossy data compression, MP3
Table of contents
1 ATRAC SP
2 ATRAC LP
3 ATRAC-3 LP-2
4 ATRAC-3 LP-4
ATRAC SP
ATRAC LP
ATRAC-3 LP-2
ATRAC-3 LP-4