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PCC322
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PostPosted: Sat Aug 03, 2019 11:51 pm    Post subject: What is HD audio? Reply with quote

Aside from being high definition audio, what does HD audio mean in terms of drivers and use? My laptop has HD audio apparently, but how would I know if it is was not enabled, would I just have no sound? Is there any situation in which this wouldn't matter to me?
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eccerr0r
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PostPosted: Sun Aug 04, 2019 12:18 am    Post subject: Reply with quote

Usually it just means it uses AMD/Intel's chipset audio controller that supports higher resolution than CD audio. Fortunately the driver is standardized - except for the codec, which may need a stare to ensure it's supported.

Yes most audio just work nowadays. If you have no sound, it didn't work. There are occasionally new chipsets that the driver doesn't support but usually it becomes supported in time ... for amdroid...
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Ant P.
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PostPosted: Sun Aug 04, 2019 12:33 pm    Post subject: Reply with quote

HD Audio means — 99% of the time — software mixing only, 1 input/output, and sample rates 5-10 times beyond the human range of hearing coupled to a bottom-dollar DAC that can only cover maybe 80% of that range. There's no driver problems because there's no features left to take away.

This regime was put in place in the Windows Vista era, in the name of DRM.
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NeddySeagoon
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PostPosted: Sun Aug 04, 2019 12:39 pm    Post subject: Reply with quote

PCC322,

snd_hda_intel is the driver for sound chips that are compliant with the Intel High Definition Audio standard.
Its either not a very good standard or there are lots of poor implementations out there or both. In some cases vendors will have added bells and whistles above the standard too, so there are extra bits you may need.

snd_hda_intel is only the PCIe bus end. The digital interface if you like.
To get analogue audio out of your system, you need the codec driver too. There are lots of them. Not only are there lots of codecs, when you get the right one for your system, you may need to tell the driver how its wired.

If it works, you have got all this right or its being auto detected. The autodetect improves with time.

How you use HDA once you have it is application dependent. You need some HDA source material to start with.
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Jaglover
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PostPosted: Sun Aug 04, 2019 1:24 pm    Post subject: Reply with quote

Quote:
sample rates 5-10 times beyond the human range of hearing

Hold on now, sample rate is not something you can hear. Higher sample rate means more accurate presentation of original analog audio.
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Ant P.
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PostPosted: Sun Aug 04, 2019 1:29 pm    Post subject: Reply with quote

Jaglover wrote:
Quote:
sample rates 5-10 times beyond the human range of hearing

Hold on now, sample rate is not something you can hear. Higher sample rate means more accurate presentation of original analog audio.

It's all moot when it's being pushed through the cheapest possible D-class amp on an electrically-noisy motherboard.
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NeddySeagoon
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PostPosted: Sun Aug 04, 2019 2:07 pm    Post subject: Reply with quote

or your hearing is good to 6.5kHz ..

That was quite a shock. I put a test record (one of those big black CDs that plays both sides) on the other day and thought my speakers were damaged.
Unfortunately not. I got the same result what a set of good headphones too.
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Jaglover
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PostPosted: Sun Aug 04, 2019 2:35 pm    Post subject: Reply with quote

Well, you still can hear the noise generated by low end equipment ... at least the lower frequencies of it ...
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