I'd feel better if one of the R&D experts can vouch for my claim, though I've never heard of a soundcard that plays 44.1 natively but resamples 48.
.. Creative's later PCI models changed to support 48 kHz instead of 44.1 kHz. I think this was a part of Microsoft's multimedia PC specifications.
Benski,Out of curiosity, how did you resample the file? It appears to have a very slight lowpass filtering applied (at about 21.8 kHz).When you posted your version I already had created a 48 kHz version with Audition and its sweep starts about 500 ms earlier because the file is not lowpassed.
How do you get a 17kHz sine wave from a 48kHz sample? ...You can't! You can get a waveform with an average frequency of 17kHz. And, that's good enough for regular audio reproduction... I'm not trying to start-up another sample-rate debate. A 17kHz sine wave has alternating positive and negative peaks every 29.4 uS (a period of 58.8 uS). At 48kHz, you get one sample every 20.8 uS. Those original peaks are lost as soon as you sample. There is just no way that the digital-to-analog converter can reproduce the original waveform! The sample-points don't "line up" with where the positive/negative peaks need to be. I know Nyquist[/u] says you can theoretically reconstruct the original 17kHz sine wave (given enough samples over a long-enough time). But, DACs and soundcards don't do that kind of mathematical analysis or processing... They just spit-out a series of data-points (analog voltages), one at a time, with low pass filtering to smooth-out the waveform.
though I've never heard of a soundcard that plays 44.1 natively but resamples 48.
Sure, though I never suggested there weren't cards that could do both natively. If it's any consolation, I own a Delta 1010.
Then I don't hear any tone again until 18, where it's then constant.
Quote from: greynol on 21 August, 2008, 04:26:27 AMthough I've never heard of a soundcard that plays 44.1 natively but resamples 48.I use the ESI Juli@ soundcard in my HTPC. It always plays with the correct sample rate and does not resample.The M-Audio Delta Audiophile 192 and the RME Digi 96/8 Pad are also soundcards that do not resample. I've tested all three - the RME Digi 96/8 Pad I use in my main PC.The ESI Juli@ I can recommend most because card+drivers are very good and stable and allow a use in all areas (WDM DirectX ASIO...).
no for 22, yes for 21 to 18, then no for 17, then again yes. hmmm.
Have you thought about what actually happens when two applications each simultaneously play sounds with different sample rates? The driver/OS/card then HAS TO resample for obvious reasons.