Here’s Jeri Ellsworth’s latest video, explaining the basics of DSP and SDR for beginners, and how to build a digital direct conversion receiver (SDR) using sampling detectors and FPGA DSP processing. (If you want to skip the silly cat portion of the video, start at 1:25.)
The links referred to in the video are below:
Useful direct conversion receiver links.
NOTE: This last link is a searchable online book entitled, “The Scientist and Engineer’s Guide to Digital Signal Processing”, by Steven W. Smith, Ph.D. Very deep tech, but worth looking at.