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In Reply to: Re: DAC ... its getting on my nerve posted by Presto on April 3, 2007 at 09:47:27:
Oversampling is required as a means of implementing a digital filter in order to bandlimit the signal to the Nyquist frequency to prevent aliasing. The Nyquist frequency is solely a result of the original sample rate. Oversampling does, as a consequence, push the D/A conversion artifacts (sample glitches) to a higher frequency which allows the use of a more gentle filter on the DAC output (analog domain) for their removal.Upsampling does change the Nyquist frequency to a degree, or at least spreads the spectrum and allows an anti-alias filter with a more gentle slope. Or something to that effect :-)
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Follow Ups
- Nice post ... but oversampling doesn't change Nyquist - Slider 11:59:19 04/04/07 (3)
- So what if... - Presto 12:25:00 04/04/07 (2)
- Yea, that's what makes upsampling a bit different - Slider 12:47:59 04/04/07 (1)
- Thanks for your input. I guess that's why... - Presto 13:51:07 04/04/07 (0)
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