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2. Intel High Definition Audio - Wikipedia

   en.wikipedia.org/wiki/Intel_High_Definition_Audio

   Intel High Definition Audio (IHDA) (also called HD Audio or development codename Azalia) is a specification for the audio sub-system of personal computers. It was released by Intel in 2004 as the successor to their AC'97 PC audio standard.

3. AC'97 - Wikipedia

   en.wikipedia.org/wiki/AC'97

   In 2004, Intel released Intel High Definition Audio (HD Audio) which is a successor that is not backward compatible with AC'97. [2] HD Audio has the capability to define up to 15 output channels, but in practice most motherboards provide no more than 8 channels ( 7.1 surround sound ).

4. Audio codec - Wikipedia

   en.wikipedia.org/wiki/Audio_codec

   The objective of the algorithm is to represent the high-fidelity audio signal with a minimum number of bits while retaining quality. This can effectively reduce the storage space and the bandwidth required for transmission of the stored audio file. Most software codecs are implemented as libraries which interface to one or more multimedia players.

5. List of codecs - Wikipedia

   en.wikipedia.org/wiki/List_of_codecs

   Sorenson AVC Pro codec, Sorenson's new implementation; OpenH264 (baseline profile only) x264 (encoder only; supports some of Hi422P and Hi444PP features) FFmpeg (decoder only) MPEG-4 AVC variants: MPEG-4 Web Video Coding or MPEG-4 Part 29 – a subset of MPEG-4 AVC baseline profile; XAVC; HEVC (High Efficiency Video Coding, H.265, MPEG-H part 2)

6. High-Definition Coding - Wikipedia

   en.wikipedia.org/wiki/High-Definition_Coding

   HDC (Hybrid Digital Coding or High-Definition Coding) with SBR (spectral band replication) is a proprietary lossy audio compression codec developed by iBiquity for use with HD Radio. It replaced the earlier PAC codec in 2003. [1] [2] In June 2017, the format was reverse engineered and determined to be a variant of HE-AACv1. [3]

7. Comparison of video codecs - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_video_codecs

   The quality the codec can achieve is heavily based on the compression format the codec uses. A codec is not a format, and there may be multiple codecs that implement the same compression specification – for example, MPEG-1 codecs typically do not achieve quality/size ratio comparable to codecs that implement the more modern H.264 specification.