[wdmaudiodev] Re: USB microphone volume
- From: Tom Duffy <tduffy@xxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Thu, 29 Oct 2009 10:49:09 -0700
This may be the answer:
http://social.answers.microsoft.com/Forums/en-US/GettingReadyforWindows7/thread/a06b5c45-32d0-417f-af06-112b59fbbcd9
There is a Microphone boost setting that is hidden
in the custom tab, that is turned on by default.
I have yet to verify this.
Tom.
-------- Original Message --------
Subject: [wdmaudiodev] Re: USB microphone volume
From: Tom Duffy <tduffy@xxxxxxxxxx>
To: wdmaudiodev@xxxxxxxxxxxxx
Date: 10/29/2009 10:33 AM
We're seeing this problem too.
The same hardware (TI PCM2900B based) on Vista 64bit
lets us push the input level to 25/100 before clipping.
On Windows 7 32bit and 64 bit, the audio clips with the
recording level slider at anything above 3/100
The
-------- Original Message --------
Subject: [wdmaudiodev] Re: USB microphone volume
From: Yanto Suryono <yanto.suryono@xxxxxxxxx>
To: wdmaudiodev@xxxxxxxxxxxxx
Date: 10/23/2009 4:32 PM
Hello,
At least my observations proved otherwise.
First I feed the device with an analog signal at amplitude which will
produce near full scale digital samples with XP.
As the volume slider is disabled in XP, I assume the audio gain here
is 0 dB.
Now, with the same input amplitude, the volume slider at position
around 25/100 with Vista business gave the same near full scale
digital level.
Then, with Win7 (I used RC1, Ultimate), even with volume slider at
position 1/100 the digital level already at near full scale. Anything
beyond that gives a clipped/distorted samples.
On Sat, Oct 24, 2009 at 08:09, Larry Osterman
<Larry.Osterman@xxxxxxxxxxxxx> wrote:
The Vista+ software volume should be attenuation only, so it shouldn't
ever be able to introduce clipping/distortion.
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Yanto Suryono
Sent: Friday, October 23, 2009 3:57 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] USB microphone volume
Hi,
I have a USB audio class device that uses usbaudio.sys.
The device has an audio input with no feature unit to control the input
volume. It reports its input terminal as microphone input but actually
it is a line input.
With WinXP everything was fine since with the lack of hardware volume
the microphone volume in volume controller was greyed out.
However, with Win7, the device input, detected as microphone input now
has a volume slider, which I suspect is a software volume (since the
hardware does not support any volume setting). The problem is that the
software volume introduces a big gain that the recorded line input will
be distorted with volume set at anything above 2 (out of 100). This
leaves usable volume setting at 0 (mute) or 1 only, which is not good at
all.
Does anyone have the same/similar problem?
What is the best solution for dealing with this kind of problem?
Is there any registry setting to disable this software volume (if it is) ?
Thanks
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