A while back I ran some capture tests on Vista (SP1), using a 24-bit AES/EBU 1kHz tone source and looking at it with Cooledit's spectrum analysis for the different combinations of Vista audio engine sampling rate (44.1kHz or 48kHz) and Cooledit recording rate (again 44.1kHz or 48kHz). My results are at http://www.innescorp.com.au/uploads/downloads/other/vistacapturesrc.pdf .
In the two cases where Windows inserts its sampling rate converter, there are some pretty high-level artefacts. This doesn't happen on render, only on capture.
Jeff----- Original Message ----- From: "Andrew Elder" <aelder@xxxxxxxxxxxxxxxx>
To: <wdmaudiodev@xxxxxxxxxxxxx> Sent: Friday, September 05, 2008 5:07 AM Subject: [wdmaudiodev] Re: Sample Rate Converters
Some test results. Playing a 1 kHz sinewave through a 48 kHz AES/EBU output I get: XP SP2 48 kHz -96 dB THD+N 44.1 kHz -85 dB THD+N 32 kHz -85 dB THD+N Vista 48 kHz -133 dB THD+N 44.1 kHz -133 dB THD+N 32 kHz -133 dB THD+N so, Vista is much better than XP in this regard. On the record side, recording from a 48 kHz input I see XP SP2 48 kHz -97 dB THD+N 44.1 kHz -86 dB THD+N 32 kHz -84 dB THD+N VistaKept getting record format errors. Couldn't get the recorder to work correctly.- Andrew All measurements made using a dScope Series III and ASI5044 audio adapter. ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.com/
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