[LAU] strange jackd zalsa_in behavior - more

Chris Caudle chris at chriscaudle.org
Tue Dec 27 04:04:42 CET 2022

On Sunday, December 25, 2022 5:58:59 PM CST Fons Adriaensen wrote:
> On Mon, Dec 26, 2022 at 12:53:11AM +0100, Fons Adriaensen wrote:
> > Could you repeat the test with the two interfaces using jaaa -A (i.e.
> > using the ALSA interface instead of Jack), after setting them to the
> > same level using Jack ?

I tested the same interface using jackd and ALSA, with just the open input
noise level displayed in JAAA.  Using jackd as the interface the noise was
in spectrum and approximately -112 dB FS.  Using ALSA interface with exactly
the same settings the noise was approximately -80dB FS.
Not total noise power, that was the approximately location of the displayed
signal using the default bandwidth settings.

The HW params looks the same for both jackd and zita programs accessing the
device, S32_LE.

When you (i.e. Fons) mentioned possibly an uncommon sample format, that would
show up there, would it not?

Chris Caudle

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