The MPEG-2 Part 7 standard (Advanced Audio Coding) was first published in 1997 and offers three default profiles:* Low Complexity (LC) – the simplest and most widely used and supported;* Main Profile (Main) – like the LC profile, with the addition of backwards prediction;* Scalable Sample Rate (SSR) (MPEG-4 AAC-SSR) – a.k.a.
* Low Complexity (LC-AAC /MPEG-2/MPEG-4);* High-Efficiency Advanced Audio Coding (HE-AAC /MPEG-4);* Main Profile;* Scalable Sample Rate (SSR);* Long Term Prediction (LTP) — более сложный и ресурсоёмкий (но и более качественный), чем все остальные.