On 2015-07-30 4:36 AM, Peter Eijlander (PA0PJE) wrote:
> I have the impression he *DOES* know what he's talking about...
Any time someone says to run the "microphone" level of a PCM29xx
series USB CODEC at 100%, he obviously does not know what he is
talking about. 100% represents 30 dB of gain (appropriate for
a microphone) - about a 30 x increase in voltage between the
codec input and ADC - which will most certainly cause clipping.
The Microsoft supplied drivers for Windows 7 (and presumably
Windows XP/Vista) do not make setting the CODEC gain easy as
they are *all gain* from 3% to 100% but it can be done. The
drivers for Windows 8/8.1 have been fixed in that the microphone
setting is gain above about 50% and attenuation below that.
*THERE IS NO PROBLEM IN WINDOWS 8/8.1*. In any Windows version
the easy solution is to *right click* on the microphone slider,
set the units to display in dB, and set the level to 0 dB +/-
1 dB.
In addition to the difficulty in setting levels in Windows 7
and before, there is a bug in the USB Audio Class driver with
regard to any USB Audio device that reports *one* microphone
input - Windows will reset the level to maximum gain each time
that endpoint (input) is opened. Resetting the input level to
100% is the only "bug" here and that has been fixed in Windows
8/8.1 (presumably Windows 10 but I have not updated any of my
systems to confirm the repair is present).
73,
... Joe, W4TV
On 2015-07-30 4:36 AM, Peter Eijlander (PA0PJE) wrote:
Op 2015-07-30 06:09 schreef Joe Subich, W4TV:
The individual posting this does not know what he's talking
about. His instruction to set the "microphone" level to 100%
is completely *wrong*.
Joe,
I have the impression he *DOES* know what he's talking about...
This is a bug he's reporting in the Windows operating system in
conjunction with a certain brand of devices.
73,
Peter
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