Digital Drive

Posted by Dave I (A) on January 29, 2002 at 18:00:51

In Reply to: Based on the way their used today... posted by Joe Murphy Jr on January 29, 2002 at 15:47:35:

Actually, oversampling is used in order to implement a steep digital anti-aliasing filter to take the place of the costly analog filters that were first used in CD players. A "gentle" analog filter is still used on the output of most players though to reduce the remaining sampling artifacts so one could argue that the result of using oversampling is an even steeper filter, not a gentler one.

Upsampling can reduce the amount of filtering required in the (oversampling) digital filter but the upsampler is in itself a digital filter with a steep cutoff slope so the result is often more filtering than would be the case without upsampling.

Dave