Users requiring more audio I/Os will typically opt for a sound card or an external audio interface, as these provide additional features that are more oriented towards professional audio applications. Motherboards typically do not have any more than eight built-in output channels (7.1 surround sound) and four input channels (back and front panel microphone inputs, and a back-panel stereo line-in). Audio jack detection, sensing, and retasking.
Support for audio codecs (e.g., ADC, DAC), modem codecs, and vendor-defined codecs.The Intel High Definition Audio specification includes the following features: It was released by Intel in 2004 as the successor to their AC'97 PC audio standard.
Intel High Definition Audio (IHDA) (also called HD Audio or development codename Azalia) is a specification for the audio sub-system of personal computers.
