[LAU] Searching for audio interface with software-controlled mic gain

Thomas Janu thomas.janu at gmail.com
Fri Sep 4 08:38:54 UTC 2015

Hi Lorenzo,

On Fri, Sep 4, 2015 at 10:00 AM, Lorenzo Sutton <lorenzofsutton at gmail.com>

> Hi Thomas,
> Sorry to dig up this oldish discussion and if I missed some of the ideas..
> but it's actually quite interesting.

No problem - it's still not solved on our side, as the two solutions so far
were deemed too expensive for a test setup by my higher-ups.

> On 25/08/2015 09:23, Thomas Janu wrote:
> [...]
>> The whole setup will be mounted at a remote location inside a larger
>> machinery for audio surveillance of said machinery (fault detection
>> etc.). The larger machinery of course may not be running while opened to
>> install our setup, thus setting the gain has to be done remotely.
>> The PC in this setup has an x86_64 CPU running Ubuntu 12.04 LTS, but the
>> case is too small for PCI(e) solutions, doesn't have firewire, so the
>> only option is USB.
> Does the audio interface *have* to be inside the machine as well? What I
> mean is Couldn't you just have the mics in the machine and the audio
> interface outside (and accessible) so as to possible set the gain, fine
> tune, turn on/off etc.?

Sadly, it has to be inside. The bigger machine it's to be mounted in is
itself stationary and outside, and not exactly at ground level. There's
sadly no feasible way to have our stuff outside of the enclosure. If it
were, the cables would be on the order of ~100m and the stuff outside the
machinery would need to be secured against weather and - more importantly -
humans that have nothing to do with it, as it would be publicly accessible.
 As there is a climb involved, repeatedly turning the machine on, checking
the levels, turning the machine off, climbing up, adjusting the levels,
climbing down, turning the machine on, ... is also not feasible.

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