digital contents

[Mikko Helin]

>frequency.  But, if that frequency exceeds half the sampling rate, it
>will be aliased and you will hear nastiness.

   I think that this kind of aliasing distortion can be avoided by using 
   oversampling, which means that sampling rate is increased so that
   aliasing occurs at higher frequencies, which are then filtered out
   before D/A conversion or resampling to lower (original) sample rate.
   This of course requires more prosessing power, but this is the method
   used in most of the audio DACs to avoid expensive analog post-DAC
   filters. 

   -Mikko