ATRAC3采用自适应数据压缩算法，可根据声音信号的频率成分和特性进行分析，实现将CD数据压缩到原始大小的大约1/10，并且几乎不损失音质。该技术通过将音频信号分为四个频带并精确分析每个频带的声音特性来实现高效压缩。
ATRAC3 Technology
ATRAC3 uses a data compression algorithm that adapts its analysis depending on the frequency components and characteristics of the sound signal. This enables it to compress CD data to approximately 1/10 of its original size with almost no loss in sound quality.
Main Features
1. Analyzes sound characteristics in four bands
ATRAC3 realizes high-efficiency compression by dividing the audio signal into four bands and analyzing the sound characteristics of each band extremely precisely.
2. Divides sound into two types and efficiently compresses each type
Sound signals carrying pure sounds, like those made by a violin or a triangle, when analyzed, are found to be composed of certain sounds that have a higher sound level in frequency analysis. ATRAC3 therefore classifies the frequency data into these two different kinds of sounds, to increase compression efficiency.
3. Replaces frequently recurring digital patterns with shorter digital patterns
Digital signals are expressed as 0s and 1s. ATRAC analyzes the pattern sequences of 0s and 1s and replaces combinations that recur frequently with shorter combinations and with those that do not occur often with longer combinations. This rule enables the overall data size to be reduced.
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