ATRAC: Adaptive Transform Acoustic Coding for Minidisc

[Rod Stasick <rostasi@xxxxxxxxx>]

Re: discussions concerning minidisc recorders, perception
and recording in general...
 
http://www.minidisc.org/aes_atrac.html
 
ATRAC is an audio coding system based on psychoacoustic
principles. The input signal is divided into three subbands
which are then transformed into the frequency domain using
a variable block length. Transform coefficients are grouped
into nonuniform bands to reflect the human auditory system,
and then quantized on the basis of dynamic sensitivity and
masking characteristics. ATRAC compresses compact disc
audio to approximately 1/5 of the original data rate with
virtually no loss in sound quality.

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