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| Name | AAC | M4R |
| Full name | AAC - Advanced Audio Coding | M4R - MPEG 4 Ringtones Audio |
| File extension | .aac | .m4r |
| MIME type | audio/aac | audio/aac |
| Developed by | Bell Labs, Fraunhofer Institute etc. | Apple Inc. |
| Type of format | Audio compression format | |
| Description | 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. | |
| Technical details | AAC supports inclusion of 48 full-bandwidth audio channels in one stream plus 16 low frequency effects channels, up to 16 "coupling" or dialog channels, and up to 16 data streams. The quality for stereo is satisfactory to modest requirements at 96 kbit/s in joint stereo mode; however, hi-fi transparency demands data rates of at least 128 kbit/s. | |
| Associated programs | foobar2000, AIMP, DirectShow, QuickTime, VLC media player. | Apple QuickTime Player, Apple iTunes |
| Wiki | https://en.wikipedia.org/wiki/Advanced_Audio_Coding | http://en.wikipedia.org/wiki/MPEG-4_Part_14 |