Intel High Definition Audio (also called HD Audio or Azalia) refers to the specification released by Intel in 2004[1] for delivering high-definition audio that is capable of playing back more channels at higher quality than previous integrated audio codecs like AC'97. During development it had the codename Azalia.
Hardware based on Intel HD Audio specifications is capable of delivering 192-kHz 32-bit quality for two channels, and 96-kHz 32-bit for up to eight channels. However, as of 2008[update], most audio hardware manufacturers do not implement the full high-end specification, especially 32-bit sampling resolution.
Microsoft Windows Vista and Windows XP SP3[2] include a Universal Audio Architecture (UAA) class driver which supports audio devices built to the HD Audio specification. Mac OS X has full support with its AppleHDA driver. Linux also supports Intel HDA controllers, as do the OpenSolaris,[3] FreeBSD[4], NetBSD and OpenBSD operating systems.
Like AC'97, HD Audio is a specification that defines the architecture, link frame format, and programming interfaces used by the controller on the PCI bus and by the codec on the other side of the link. Implementations of the host controller are available from at least Intel, Nvidia, and AMD.[5] Codecs which can be used with such controllers are available from many companies, including Realtek,[6] Conexant, and Analog Devices.[7]
References
- ^ High Definition Audio Specification, Revision 1.0, 2004
- ^ Microsoft Knowledge Base Article 888111
- ^ OpenSolaris Boomer Project Page, 2009
- ^ http://man.freebsd.org/snd_hda
- ^ AMD SB600 Product Information Page, 2009
- ^ ALC888 Product Page, 2009
- ^ AD1988 Product Information Page, 2009
External links
- Intel High Definition Audio
- How the Intel HD Audio system works Pt 1
- How the Intel HD Audio system works Pt 2
- High Definition Audio Specification 1.0 (April 15, 2004)
- Motherboard/Sound-cards connectors pinout specifications
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