[wdmaudiodev] Re: USB microphone volume
- From: Yanto Suryono <yanto.suryono@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Sat, 24 Oct 2009 08:32:44 +0900
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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