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The MQA system is a three-part process applied to digital audio music recordings consisting of: 1) modifying and controlling the end-to-end digital filter response; [1] 2) preparing the audio for transfer to a smartphone or audio device using a lossy audio compression format with authentication; and 3) decompressing the recording for playback. [2]
The 'Music' category is merely a guideline on commercialized uses of a particular format, not a technical assessment of its capabilities. For example, MP3 and AAC dominate the personal audio market in terms of market share, though many other formats are comparably well suited to fill this role from a purely technical standpoint.
An audio coding format [1] (or sometimes audio compression format) is a content representation format for storage or transmission of digital audio (such as in digital television, digital radio and in audio and video files). Examples of audio coding formats include MP3, AAC, Vorbis, FLAC, and Opus.
FhG MP3 encoder from Adobe Audition 1.0 VBR quality 40, "Current - Best" codec. Apple iTunes 4.2 MP3 112 kbit/s VBR, Highest quality, joint stereo, smart encoding; GOGO-no-coda 3.12-b 128 -a -q 0; Audioactive Encoder 2.04 128 kbit/s High Quality; Xing MP3 Encoder 1.5 VBR quality normal; Various 12 11-22 LAME
The data compression software for encoding into ALAC files, Apple Lossless Encoder, was introduced into the Mac OS X Core Audio framework on April 28, 2004, together with the QuickTime 6.5.1 update, thus making it available in iTunes since version 4.5 and above, and its replacement, the Music application. [8]
ATRAC was developed for Sony's MiniDisc format. ATRAC was updated with version 2, then version 3, version 4, version 4.5, and Type R and Type S. [2] The first major update was ATRAC3 (not to be confused with version 3 of original ATRAC) in 1999. [3]
Linear pulse-code modulation (LPCM, generally only described as PCM) is the format for uncompressed audio in media files and it is also the standard for CD-DA; note that in computers, LPCM is usually stored in container formats such as WAV, AIFF, or AU, or as raw audio format, although not technically necessary.
Microsoft claimed that WMA could produce files that were half the size of equivalent-quality MP3 files; [10] Microsoft also claimed that WMA delivered "near CD-quality" audio at 64 kbit/s. [10] The former claim however was rejected by some audiophiles [11] and both claims have been refuted through publicly-available codec listening tests.