[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.


  ----- 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.




  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

Other related posts: