AAC MPEG-2 Audio AAC

The speech compression system whichis used with image compressed standard MPEG-2 or MPEG-4. It was standardized in 1997 April as ISO 13818-7. As for maximum sampling frequency with 96kHz, as for the number of channels which can be used maximum of it is channel 48.About1.4 times compressed efficiency is higher than MP3 which is the speech compression system which is adopted for MPEG-1, the sound quality almost the same.