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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.
The AudioPCI DOS driver included Ensoniq Soundscape 16-bit digital audio and sample-based synthesis support, along with support for Sound Blaster Pro, AdLib Gold, General MIDI, and MT-32. However, without actual hardware for FM synthesis , FM music and sound effects were simulated using samples, often with unacceptable results.
HD Audio support in the 1xx3 improved through the chipset's life with several revisions. The DD and CC versions of the chipset both added full 7.1 HD-audio support to the chipset. The 1073 players all built on a common SDK (firmware+OS) provided by Realtek. This meant that they were all essentially similar in performance and interface.
The Audigy SE (SB0570) and Audigy Value (SB0570) are stripped down models, with a less expensive CA0106 audio-controller in place of the EMU10k2. With the CA0106, the SE/Value are limited to software-based EAX 3.0 (upgraded to software-based EAX 4.0 with a driver update), no advanced resolution DVD-Audio Playback, and no Dolby Digital 5.1 or Dolby Digital EX 6.1 playback.