Quote:
Originally posted by kwkarth
Huh? |
Alright, sorry for the delay, and lack of subsequent quality in my response...I started doing online research, and I just don't have time right now, so I'll go from memory. Please feel free to correct me on technical aspects:
I didn't think it was possible to create a digital filter that performed frequency domain transformations without getting
some amount of "ring".
No single sample contains frequency information. In order to obtain enough information to convert a signal into the frequency domain, you
have to look at the samples on either side at the timeslice for which you are calculating the frequency content.
Hence, there will be "spillover" -- the adjacent time slices will get a little bit of frequency information from the adjoining samples without actually containing that frequency information. Another way of saying it will "ring" -- the frequency information will "smear" slightly, in the time domain.
Of course, this information could be based on technology which is simply old, but I didn't think they found a way to get rid of ring completely (...yet). Hence the reason some of the highest-end and most expensive DAC's don't have digital filters at all.
NP: Radiohead's
Amnesiac