Home Digital Drive

Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it.

RE: Chord up-samples?

Two points of clarification... probably more for me than for you.

You're right - there's no increase of encoded input signal bandwidth because that signal is already band limited to prevent aliasing at the ADC.

The interpolation filter should already be a low pass filter because of those reflected images at the original base sampling frequency (fs) that you mentioned. However, the low pass filter won't remove the image at the new, higher sampling frequency, L * fs, where L is the interpolation factor. That's the job of the reconstruction (or antialias) filter, which can now have a much simpler design because the images are now centered around L * fs.

This post is made possible by the generous support of people like you and our sponsors:

Follow Ups Full Thread
Follow Ups


Post a Message!

Forgot Password?
Moniker (Username):
Password (Optional):
  Remember my Moniker & Password  (What's this?)    Eat Me
E-Mail (Optional):
Message:   (Posts are subject to Content Rules)
Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:  Automagically notify you when someone responds.