| Subject | : | OS2 World Poll: What is AAC audio format? |
| Author | : | Kim |
| Date | : | 06 May, 2004 on 21:41 |
| AAC means "Advanced Audio Coding", and in the beginning it was also called MPEG-2 NBC for "Non-Backwards Compatible" as opposed to the MPEG-1 and MPEG-2 BC (with 5.1 channels) standards. It is now considered to be the actual "state of the art" in general audio coding and the natural successor of MPEG-1/2 Layer III / MP3 in the new multimedia standard MPEG-4 that uses MP4 as the container format for all kinds of content. AAC is able to include 48 full-bandwidth (up to 96 kHz) audio channels in one stream plus 15 low frequency enhancement (LFE, limited to 120 Hz) channels and up to 15 data streams. Besides it has further multi-language capacities. Actually AAC comes in different "flavours" called Profiles (MPEG-2) or Object Types (MPEG-4) which make up a whole family of compressors that are not necessarily compatible to each other, especially for different players (see the MP4 and PsyTEL pages in this Wiki for more informations on this): * MPEG-2 AAC LC / Low Complexity
For more info about audio coding, check AudioCodingWike. |