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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.
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 ).
Driver family Driver Chipsets Chipset PHY Modes Integration in mainline Non-free firmware required [note 1] License Development adm8211: adm8211: ADMtek ADM8211 (802.11b MAC/BBP) b Yes Yes GPLv2 With support from Infineon / ADMtek at76c50x‑usb: at76c50x-usb: Atmel AT76C503 / AT76C505 based USB WLAN adapters b Yes Depends on the model GPLv2 ...
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.