Advanced Audio Coding (AAC) is an audio coding standard for lossy digital audio compression. It was designed to be the successor of the MP3 format and generally achieves higher sound quality than MP3 at the same bit rate.[4] AAC has been standardized by ISO and IEC as part of the MPEG-2 and MPEG-4 specifications.[5][6] Part of AAC, HE-AAC ("AAC+"), is part of MPEG-4 Audio and is adopted into digit