[LAU] Small instrument hardware module

Len Ovens len at ovenwerks.net
Tue Oct 21 20:15:41 UTC 2014

On Tue, 21 Oct 2014, Harry van Haaren wrote:

> Hey all,
> I have a HDA ( cat /proc/interrupts tells me so anyway: snd_hda_intel ).
> Its my built-in laptop soundcard, and it works pretty well, down to about 44.1kHz, -p128
> -n3. That's ~8ms, which is acceptable IMO.
> I've read on mailing list / internet somewhere* that spec for the HDA is pretty
> open-to-interpretation, so I think the exact hardware / chipset would need to be tested
> to get true results.

I have gotten 48k -p64 -n3 on mine. Jack will crash if I try -p64 -n2, but 
-p128 -n2 works.
>From my reading, HDA is (like AC97) more of a bus spec than a sound spec. 
It seems to deal with connecting the sound from the HW to the internal 
bus. The HDA bus runs at 48K (like AC97) but does not expect the HW to be 
48k (as AC97 did) and has methods for transporting audio with other sample 
rates than 48K.

In my opinion, 128/2 is just on the edge of useful for live (guitarix for 
example) use. 256/2 is annoying already. (No I do not play play really 
fast or anything like that)

Len Ovens

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