[wdmaudiodev] Re: USB microphone volume
- From: Yanto Suryono <yanto.suryono@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Sat, 31 Oct 2009 08:49:08 +0900
Hi Tom,
This might be really the answer to the problem.
Maybe Larry or anyone else at Microsoft could clarify this, as this
microphone boost (+20 dB?) must also be implemented in software.
The difference in position of volume slider before clipping also
suggests that the software volume does do amplification.
Yet, web search gave results with more complaints about mic level to
be too low rather than too high. I will not be surprised then if
windows developer did increase the software volume gain in windows 7.
In this case, there should be some mechanism to turn this feature off
for normal behaving devices.
Yanto
On Fri, Oct 30, 2009 at 02:49, Tom Duffy <tduffy@xxxxxxxxxx> wrote:
> 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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