[wdmaudiodev] Re: Capture with USBAudio under Windows 7 noisy
- From: "Jeff Pages" <barefeet@xxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Fri, 23 Jul 2010 11:46:39 +1000
The applications I've used include Cooledit and Adobe Audition, as well as a
spectrum analyser program I wrote which used the wave API. On XP I believe
capture always used the "best" converter regardless of API, and I don't see
the problem on that platform (all the converter artefacts are below -96dB).
Is there any way in Vista or Windows 7 to force it to use a better quality
converter on capture?
Jeff
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Larry Osterman
Sent: Friday, 23 July 2010 11:29 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Capture with USBAudio under Windows 7 noisy
What API are you using to capture? It's possible that you're using one of
the lower quality resamplers in the box (for instance if you're using the
wave APIs, I believe you'll use the ACM resampler which is basically the
same resampler used in XP).
Larry
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Jeff Pages
Sent: Thursday, July 22, 2010 4:20 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Capture with USBAudio under Windows 7 noisy
Tim wrote:
>The purists might disagree, but it has been my experience that the
>Windows sample rate converter is pretty good for most purposes. How
>are you detecting the noise at 4 kHz? Are you injecting a pure signal
>and doing a spectrum analysis on the result?
While the render sampling rate converter in Windows 7 is very good, the
capture converter is a different matter entirely. It has conversion
artefacts at about -65dB on a pure tone. I first noticed this back when
Vista was released and tried reporting it a couple of times but got nowhere,
and the problem has persisted into Windows 7.
Jeff
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