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 ****************** 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/ ****************** 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/
