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In Reply to: Um, didn't quite follow the bat $h!t and Wall St. stories, but posted by E-Stat on November 26, 2005 at 09:51:01:
1. A bunch of instruments produce output waaay past 20k.
2. With RBCD, you must remove ALL of that or what remains will be pure distortion.
3. Brickwall filters used to achieve #2 do nasty things down in the critical 100 hz to 10 khz audible range.
BTW Happy holidays :)Just to follow up, it makes sense to me that you need an equivalent of a brickwall filter to remove everything above what is capable
of being recorded at the sampling frequency (to prevent aliasing/noise). But how do these filters change the recorded sampling in the audible range?I did a bit of hunting and noticed there was an issue w/ Phase deviations, which occur w/ analog brick wall filters but I dont think this is an issue w/ digital filters but I may be mistaken. What are the general problems w/ lopping off the > 20 khz or so frequencies using a digital filter?
-best
-avi
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Follow Ups
- Re: Um, didn't quite follow the bat $h!t and Wall St. stories, but - bloosquare 09:02:48 11/28/05 (1)
- I will have to leave the technical discussion - E-Stat 09:35:37 11/28/05 (0)
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