No loss in sound quality

charm

交易区新帖推荐

  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.

charm

Recently, there has been an increasing consumer demand for a portable recordable high-quality digital audio media. The MiniDisc system was developed to meet this demand. The MiniDisc is based on a 64 mm optical or magneto-optical disc which has approximately 1/5 of the data storage capacity of a standard compact disc. Despite the reduced storage capacity, it was necessary that the MiniDisc maintain high sound quality and a playing time of 74 minutes. The ATRAC (Adaptive Transform Acoustic Coding) data compression system was therefor designed to meet the following criteria:
Compression of 16-bit 44.1 kHz stereo audio into less than 1/5 of the original data rate with minimal reduction in sound quality.
Simple and inexpensive hardware implementation suitable for portable players and recorders.

vineland

atrac就是sony搞的那个东西吧
听过几次，和cd区别还是非常明显的