🚀 go-pugleaf

In article <1993Jan2.164406.25688@leland.Stanford.EDU>, kong@leland.Stanford.EDU (Kong Kritayakirana) writes:
|> From: matthews@eecs.ucdavis.edu (Thomas W. Matthews)

(first part deleted)
  
|> >these can be mitigated by
|> >increasing the sampling frequency (to decrease required filter complexity) or
|> >by doing more of ther filtering in the digital domain (certain types of
|> >filter responses are possible there). 
|>  
|> You cannot solve the problem of aliasing with digital filter. Once you've gone 
|> from analog to digital, the aliases are already there and you cannot tell 
|> which is which if you use too low a sampling rate.

Perhaps I wasn't clear.  I didn't mean to say that digital filters can correct
an aliasing problem that has already occurred.  I was trying to talk about
the "oversampling" function of a CD player and its role in reconstructing
analog from a properly sampled digital signal.  The interpolation of samples
to raise the sampling rate can be thought of as a filtering operation that
is accomplished in the digital domain and relaxes the constraints on the analog
part of the reconstruction filter.

Tom Matthews