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Advanced Audio Coding (MPEG-4)
https://www.loc.gov/preservation/digital/formats/fdd/fdd000114.shtml
Format Description for AAC_MP4 -- Perceptual audio encoding format designed for efficient distribution of sound files over moderate bandwidth connections; may be used at higher data rates for better fidelity. AAC_MP4 compression is a further refinement of AAC_MP2.
Audio | MPEG
https://mpeg.chiariglione.org/standards/mpeg-4/audio
MPEG-4 SBR, (Spectral Band Replication) is a bandwidth extension tool used in combination with e.g. the AAC general audio codec. When integrated into the MPEG AAC codec, a significant improvement of the performance is available, which can be used to lower the bitrate or improve the audio quality.
AAC file | Convert Files
https://www.convertfiles.com/file_type_description/MPEG-4_AAC_Audio_File.html
More information on AAC, MPEG-4 AAC Audio File (.aac) The .aac file format. MPEG and MPG are very similar in design and function. MPEG is a more recent format which branches off into standards MPEG-1 all the way through to MPEG-21. They feature a lossy compression that allows for ease of downloading and uploading using smaller file sizes and at ...
MPEG to AAC - Convert audio online
https://www.aconvert.com/audio/mpeg-to-aac/
Advanced Audio Coding (AAC) is an audio coding standard for lossy digital audio compression. Designed to be the successor of the MP3 format, AAC generally achieves better sound quality than MP3 at similar bit rates. AAC has been standardized by ISO and IEC, as part of the MPEG-2 and MPEG-4 specifications.
Difference Between MPEG and AAC | Difference Between
http://www.differencebetween.net/technology/difference-between-mpeg-and-aac/
Advanced Audio Coding or AAC is simply a subset of MPEG as it is a part of the MPEG-4 Part 3 standard. MPEG is used in a lot of applications. It is used in encoding video files like movies and clips to a digital format. As we can clearly see from the name, AAC is only used when encoding sound files only.
MPEG to AAC (Online & Free) — Convertio
https://convertio.co/mpeg-aac/
Settings. Set the AAC audio bitrate per channel. For example, stereo audio with 128 kbps set here will produce a 256 kbps file. If set to "Custom", the recommended range is ≥64 kbps. Set the number of audio channels. This setting is most useful when downmixing channels (e.g., from 5.1 to stereo). Set the sample rate of the audio.
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