The typical HDA codec chips are capable of handling multi-channel 192kHz/24-bit streaming I/O, so actually quite technically advanced little chips with quite decent audio performance. For example, see: One component of the onboard HDA solution is implemented in the chipset (i.e., "Intel HD Audio") which receives and transmits serial digital audio data streams to/from a codec chip (typically a Realtek or VIA audio codec chip) which among other things handles necessary ADC and DAC duties as well as analog and digital processing. It's actually a logo certification program by MS under which PC audio systems must meet rather rigorous technical requirements subject to testing per relevant AES specs using Audio Precision hardware and software (just like most high-end audio equipment manufacturers use). The "High Definition Audio" (HDA) designation is not just some meaningless marketing ploy.
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