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Intel High Definition Audio

A specification for the audio sub-system of personal computers.
Realtek Alc882 Hdaudio Codec

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 its AC'97 PC audio standard.

Features of the specification include:

  • Up to 15 input and 15 output streams
  • Up to 16 PCM audio channels per stream
  • Sample resolutions of 8–32 bits
  • Sample rates of 6–192 kHz
  • Support for audio codecs (e.g., ADC, DAC), modem codecs, and vendor-defined codecs
  • Discoverable codec architecture
  • Fine-grained codec power-control
  • Audio jack detection, sensing, and retasking

However, as of 2008, most audio hardware manufacturers did not implement the full specification, especially 32-bit sampling resolution. Motherboards typically do not have any more than eight onboard output channels (7.1 surround sound) and four input channels (back and front panel microphone inputs, and a back-panel stereo line-in). Users requiring more audio I/Os will typically opt for a sound card or an external audio interface, as these devices also provide additional features that are more oriented towards professional audio applications.

Key Terms

audio sub system personal computers
development codename azalia
features
hd audio
ihda
intel
intel high definition audio
pc audio standard
specification
successor

Additional Resources

No ressources found.

Acronymn

IHDA

Synonymns

Intel High Definition Audio
HD Audio

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Sources & Credits

Last modified on May 13 2020
Content adapted from Wikipedia
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