MPEG-4 AAC Main Profile - Definition. Was ist MPEG-4 AAC Main Profile
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Was (wer) ist MPEG-4 AAC Main Profile - definition

THIRD PART OF THE ISO/IEC MPEG-4 INTERNATIONAL STANDARD
MPEG-4 AAC-SSR; MPEG-4 Layer 3; MPEG-4 Audio; ISO/IEC 14496-3
  • Hierarchical structure of AAC Profile, HE-AAC Profile and HE-AAC v2 Profile, and compatibility between them. The HE-AAC Profile decoder is fully capable of decoding any AAC Profile stream. Similarly the HE-AAC v2 decoder can handle all HE-AAC Profile streams as well as all AAC Profile streams. Based on the MPEG-4 Part 3 technical specification.<ref name="mpeg4audio-n7016" />

MPEG-4 AAC Main Profile      
<compression, standard, algorithm> A successor of MP3 allowing transparent coding at data rates of 70-75% of that of MP3. It is very different from MP3, only used MDCT, no subband coding. It is much more complex that MP3 and MPEG-2 AAC Low Profile. (2001-12-08)
MPEG-4 Part 3         
MPEG-4 Part 3 or MPEG-4 Audio (formally ISO/IEC 14496-3) is the third part of the ISO/IEC MPEG-4 international standard developed by Moving Picture Experts Group. It specifies audio coding methods.
MPEG-4 Part 2         
VIDEO COMPRESSION FORMAT
Advanced Simple Profile; MPEG-4 Layer 2; MPEG-4 ASP; MPEG-4 part 2; MPEG-4 Visual; ISO/IEC 14496-2
MPEG-4 Part 2, MPEG-4 Visual (formally ISO/IEC 14496-2) is a video compression format developed by the Moving Picture Experts Group (MPEG). It belongs to the MPEG-4 ISO/IEC standards.

Wikipedia

MPEG-4 Part 3

MPEG-4 Part 3 or MPEG-4 Audio (formally ISO/IEC 14496-3) is the third part of the ISO/IEC MPEG-4 international standard developed by Moving Picture Experts Group. It specifies audio coding methods. The first version of ISO/IEC 14496-3 was published in 1999.

The MPEG-4 Part 3 consists of a variety of audio coding technologies – from lossy speech coding (HVXC, CELP), general audio coding (AAC, TwinVQ, BSAC), lossless audio compression (MPEG-4 SLS, Audio Lossless Coding, MPEG-4 DST), a Text-To-Speech Interface (TTSI), Structured Audio (using SAOL, SASL, MIDI) and many additional audio synthesis and coding techniques.

MPEG-4 Audio does not target a single application such as real-time telephony or high-quality audio compression. It applies to every application which requires the use of advanced sound compression, synthesis, manipulation, or playback. MPEG-4 Audio is a new type of audio standard that integrates numerous different types of audio coding: natural sound and synthetic sound, low bitrate delivery and high-quality delivery, speech and music, complex soundtracks and simple ones, traditional content and interactive content.