I checked a bit and found my Xonar U7 mic level was at 0. Never had
checked it before since WSJT-X seemed happy-as-a-clam decoding stuff with
the level at 30. Bumped it up and Audacity now shows -.2 to .2 and can
hear it without cranking up the speakers. I've got the level at 70 on the
Xonar now and of course had to crank down the digital gain a fair bit.
RRR
Mike W9MDB
On Tue, Jan 19, 2016 at 1:44 PM, Bill Somerville <[email protected]>
wrote:
> On 19/01/2016 19:30, Bill Somerville wrote:
> > On 19/01/2016 19:22, Michael Black wrote:
> >> >One more thing though...the amplitude in the WAV files is VERY low.
> >> >On Audacity's scale of -1 to 1 it's around 0.01. You can barely hear
> it.
> > Hi Mike,
> >
> > our files are LPCM i.e. linear encoded. Most PCM WAV files are either
> > a-Law or mu-Law logarithmic encoded. This is the reason that they are
> > showing low amplitude. I will try and find the right format fields to
> > show that they are LPCM encoded but that assumes these media players are
> > capable of playing LPCM streams.
> Hi Mike,
>
> looking at this further I don't understand why the levels show so low in
> players like Audacity. LPCM should be the default format. Essentially
> because it is lossless which is, I assume, why we use it rather than
> A-Law or μ-Law logarithmic amplitude compression which is usually used
> to fit 16 or 24-bit linear samples into an 8-bits/sample format.
>
> 73
> Bill
> G4WJS.
>
>
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