AAC

Advanced Audio Coding

ISO/IEC 13818-7 MPEG-2 AAC AAC-Main

ISO/IEC 14496-3, Subpart 4 MPEG-4 AAC

Profile

AAC-LC (Low Complexity)

AAC-MAIN (Main Profile)

LC に Backward prediction を追加

Sample-Rate Scalable (SRS)

PQF で4つのサブバンクに分割して符号化

Long Term Prediction (LTP)

MAIN + Forward prediction を追加

最大 48ch

8kHz ～ 96kHz

DCT (Discrete Cosine Transform) (MP3はMDCT?)

拡張仕様?

HC-AAC (SBS: Spectral Band Replication)

SBR (ISO/IEC 14496-3:2001

AAC-LD (Low Delay)

MPEG4-SLS (Scalable to Lossless)

MPEG4-ALS (Audio Lossless Coding)