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Greg Sullivan

Audio artifacts on Windows 7

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On Windows 7, if I set the Playback sample rate to 48kHz, and then use the Tone Generator to play back a sine wave, I can hear an artifact which sounds like aliasing. If I set the playback rate to 44.1kHz, the tone sounds very pure. I am testing with low frequencies (say, 50Hz).

 

I first noticed this problem in YouTube, and I have crossposted in a few places, including the Windows Pro Audio Developer forum:

http://social.msdn.microsoft.com/Forums/en/windowspro-audiodevelopment/thread/725546ce-57bf-40d0-b7aa-47e51de9c3ae

 

System:

Toshiba NB300 netbook

Windows 7 Starter Edition

 

Are you using the old "WaveOut" API, by any chance?

 

Regards,

Greg.

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On Windows 7, if I set the Playback sample rate to 48kHz, and then use the Tone Generator to play back a sine wave, I can hear an artifact which sounds like aliasing. If I set the playback rate to 44.1kHz, the tone sounds very pure. I am testing with low frequencies (say, 50Hz).

 

I first noticed this problem in YouTube, and I have crossposted in a few places, including the Windows Pro Audio Developer forum:

http://social.msdn.m...aa-47e51de9c3ae

 

System:

Toshiba NB300 netbook

Windows 7 Starter Edition

 

Are you using the old "WaveOut" API, by any chance?

 

Regards,

Greg.

 

What happens when you save it to a Wave file first then play it back for testing?

 

oh and some sound cards do really weird stuff handing 44,100 over to 48,000 and vice versa as well, so how do you know what it is doing at the gut level?

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