[wdmaudiodev] Re: Vista audio capture sampling rate converter
- From: "Jeff Pages" <jeff@xxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Fri, 7 Dec 2007 14:37:54 +1100
Hi Hakon,
I've just installed Vista SP1 RC and I'm afraid I'm still seeing pretty serious
sampling rate conversion artefacts (at about -60dB) whenever the Windows
sampling rate converter is invoked to convert from 48kHz to 44.1kHz or vice
versa. This doesn't happen at all on playback. The problem is present with both
24-bit and 16-bit recording.
Jeff
----- Original Message -----
From: Hakon Strande
To: wdmaudiodev@xxxxxxxxxxxxx
Sent: Tuesday, May 15, 2007 4:36 AM
Subject: [wdmaudiodev] Re: Vista audio capture sampling rate converter
Vista RTM shipped with a float-int conversion bug where we truncate instead
of rounding. This could be the cause of what you are seeing. Please tests with
SP1 beta when it ships (no, I don't know when that is) to see if this has been
addressed with those bits. If not, please report back.
Sincerely,
Hakon Strande | Windows Sound Team PM |
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Jeff Pages
Sent: Sunday, May 13, 2007 6:59 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Vista audio capture sampling rate converter
I've just noticed that, with audio capture, when the audio engine is set to
44.1kHz and I'm recording at 48kHz, or vice versa, I'm seeing sampling rate
conversion artefacts at about -60dB. On playback, however, the SRC does a far
better job, with any artefacts well below -100dB.
Is this to be expected, and if so, is there any way to get Vista to use a
better quality SRC for audio capture?
Jeff Pages
Innes Corporation Pty Ltd
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