In Reply to: Question about "upsampling" posted by Slider on February 11, 2009 at 11:38:31:
My thinking is that a good first stage filter can be followed by a mediocre second stage filter, which will be much less critical because it is operating way out of the audible band.
Whether a two stage approach or a one stage approach sounds better will depend on the particular filters involved. Note that the first stage filter increases the bit depth of the signal going to the second stage filter, so upsampling CD material to higher rates is probably a poor idea if you are using a 16 bit DAC.
Another advantage of the two stage approach is that the critical first filter can be implemented by software, making it much easier to tweak.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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Follow Ups
- RE: Question about "upsampling" - Tony Lauck 11:57:03 02/11/09 (5)
- No brickwall filter then? - Slider 12:11:50 02/12/09 (4)
- No Free Lunch! - Charles Hansen 20:30:32 02/12/09 (0)
- RE: No brickwall filter then? - Tony Lauck 13:52:34 02/12/09 (2)
- So, is that a yes? - Slider 23:56:53 02/12/09 (1)
- One of the few posts by Ted that is wrong. - Charles Hansen 10:42:34 02/13/09 (0)