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Lossless audio compression Patented DRM; Encoder Player AAC: ISO/IEC MPEG Audio Committee: 1997 ISO/IEC 14496-3 Non-free [1] Nero Digital Audio, Apple CoreAudio (via QuickTime, iTunes or afconvert [2]) FAAC (encoding only), FAAD2 (decoding only), FFmpeg, Audiocogs [3] (decoding only), Fraunhofer FDK AAC: Digital TV service, Digital Radio ...
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]
A lossless audio coding format reduces the total data needed to represent a sound but can be de-coded to its original, uncompressed form. A lossy audio coding format additionally reduces the bit resolution of the sound on top of compression, which results in far less data at the cost of irretrievably lost information.
In a lossless compressed format, however, the music would occupy a smaller file than an uncompressed format and the silence would take up almost no space at all. Lossless compression formats include FLAC, WavPack, Monkey's Audio, ALAC (Apple Lossless). They provide a compression ratio of about 2:1 (i.e. their files take up half the space of PCM).
Audio Interchange File Format (AIFF) is an audio file format standard used for storing sound data for personal computers and other electronic audio devices. The format was developed by Apple Inc. in 1988 based on Electronic Arts' Interchange File Format (IFF, widely used on Amiga systems) and is most commonly used on Apple Macintosh computer systems.
JPEG XS lossless FastTICO-XS; IETF standards: FFV1 (RFC 9043) [45] – FFV1's compression factor is comparable to Motion JPEG 2000, but based on quicker algorithms (allows real-time capture). Written by Michael Niedermayer and published as part of FFmpeg under GNU LGPL. FFmpeg; SMPTE standards: VC-2 HQ lossless (a.k.a. Dirac Pro lossless) libdirac
Voice Memos is a voice recording app introduced on iPhones with the release of iPhone OS 3, designed for saving short snippets of audio for later playback. Saved voice memos can be shared as a .m4a file or can be edited, which allows parts of a recording to be replaced, background noise to be removed, or the length of a recording to be trimmed.
G.722 is an ITU standard codec that provides 7 kHz wideband audio at data rates from 48, 56 and 64 kbit/s. This is useful for voice over IP applications, such as on a local area network where network bandwidth is readily available, and offers a significant improvement in speech quality over older narrowband codecs such as G.711, without an excessive increase in implementation complexity.