Location: Seattle WA, USA (via Zoom)
Moderated by: Dan Mortensen
Speaker(s): James D. (jj) Johnston | Immersion Networks
Have you ever wondered why your digital audio system can not "miss" that spike that happens entirely between samples? Have you ever wondered how you can get subsample time resolution in digital systems, without even trying? Well, here's the answer, signal bandwidth.
This talk explains what restricting the bandwidth of a signal does, necessarily, to the signal. To the first question above, no, that signal can not ever even exist unless it's many, many times outside the bandwidth of the digital system you're examining. To the second question, no, you don't have any 'stairsteps' and no, you don't have any "edges" in the reproduced signal.
We'll start with a single "impulse", and show what system bandwidth looks like, why filters look the way they do, and how the output of a digital signal can not have any edges. All of this is due to the required bandwidth limitation in a sampled data system. Along the way, a few bits of disinformation will be revealed and dismissed for what they are.
More info, jj's bio, and the all-important EventBrite link can be found at our website: https://www.aes.org/sections/pnw/
Other Business: Our Section website has an extensive archive of our section's past meetings, with topics spanning the breadth of audio engineering, going back to at least 1993. These meeting reports sometimes contain photos, audio and video recordings (more audio than video, after all, we are the AES), powerpoint decks, etc. The archive can be found at: https://www.aes-media.org/sections/pnw/pnwrecaps/
Also at that address is the meeting notice archive, which does go to the beginnings of the AESPNW Section, February 1977.
Posted: Thursday, October 13, 2022
« The Physics of Microphones: How They Work and… | Main | A Repair-centric Approach to Audio Gear… »
