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This uses a 132 kbit/s data rate, the quality of which is advertised to be similar to that of MP3 encoded at a similar bit rate.

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Furthermore, compared to newer formats such as Windows Media Audio which use a simple MDCT rather than a hybrid, ATRAC3 must perform an additional and computationally expensive inverse- QMF, although the hybrid system does significantly reduce memory usage, which was likely a factor given the limited memory available when ATRAC was originally developed. However, as ATRAC is a hybrid subband- MDCT codec that is algorithmically very similar to MP3, any advantage is probably exaggerated.

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Sony claims the major advantage of ATRAC3 is its coding efficiency, which was tuned for portable DSP which provides less computing power and battery life. During decoding, they are separately reconstructed and added back to reform the original MDCT coefficients.

Additionally, prior to quantization, tonal components are subtracted from the signal and independently quantized. Instead, a simpler transient encoding technique called gain control is used, in which the gain of different subbands is varied during a transient prior to MDCT and then restored during decoding after the inverse MDCT to try to smooth over transients. Unlike nearly all modern formats, the transform length cannot be varied to optimize coding transients. The four subbands are then MDCT encoded using a fixed-length transform. In ATRAC3, Three stacked QMF split the signal into 4 parts: Like ATRAC1 and MP3, ATRAC3 is also a hybrid subband- MDCT encoder, but with several differences. High- frequency lowpass depends on the complexity of the material some encodings have content clear up to 22.05В kHz.ДЄTRAC1 can also be used in mono (one channel) mode, doubling recording time.ДЇFmpeg has an implementation of an ATRAC1 decoder.

Two stacked quadrature mirror filters split the signal into 3 parts:ДЇull stereo (i.e., independent channel) encoding with a data rate of 292 kbit/s. SDDS uses ATRAC1 with 8 channel encoding, and with a total encoding rate over all the channels of 1168 kbit/s. Minidiscs with ATRAC format songs have, in the past, been supported on Eclipse brand car stereos.ДЄTRAC1 was first used in Sony's own theater format SDDS system in the 1990s, and in this context is a direct competitor to Dolby Digital (AC3) and DTS.

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Sony's Xplod series of car audio CD players support ATRAC CDs. However, as Sony only pushed ATRAC compatibility in Sony Ericsson Walkman series phones in the Japanese market, it is not supported in GSM/ UMTS market phones. Sony Walkmans offer better battery life when playing ATRAC files as compared to MP3 files. These trade-offs are entirely logical on DSP systems, where memory was often at a premium compared to multiplier performance. This is reflected in the design of the ATRAC codecs, which tend to emphasize processing smaller numbers of samples at a time to save memory at the cost of compression efficiency and additional multiplies. This is in contrast to other codecs developed on computers with no regard for the constraints of portable hardware. For purposes of comparison, CDs are encoded at 1411.2 kbit/s, and lossless encoders can encode most CDs below 1000 kbit/s, with significant bitrate reduction for easier-to-encode content such as voice.ДЄccording to ATRAC engineers, ATRAC algorithms were developed in close cooperation with LSI integrated circuit development engineers within Sony in order to deliver on a tangible product that could encode at high speeds and with minimal power consumption. Years later ATRAC was improved and is generally considered better than earlier versions at similar bitrates. ATRAC's original 292 kbit/s bitrate, as used on the original MiniDiscs, was designed to be close to CD quality acoustically.