Recently I described a browser-based application designed to measure and plot the arrival angle of a signal using the phase difference between two antennas spaced some distance apart, and I produced a YouTube video showing how multiple arrival paths and local reflections made that generally impossible.
However, it is a fact that every arriving signal produces its own phase difference, and if multiple signals arrive on the same frequency it should be possible to discern between them if they arrive from different spatial directions. As long as they are reasonably stable spatially, of course.
So again using ChatGPT for the code, I created another browser-based application to do just that utilizing FFT processing of the stereo audio from two phase locked receivers. Specifically, the application uses MVDR adaptive beam forming techniques with statistically derived variable weighting of the FFT bins associated with the various voice signals. I'm not personally well informed on these techniques, but ChatGPT seemed to be and I'll bet K9YC and some of the other audio experts here know a lot more about it than I do.
In any case, although it is far from perfect, I was able to distinguish signals using some test files surprisingly well.
The application itself is freely available www.ab7e.com/SpatialSignalFilter.html
and some pre-recorded audio test files are available at www.ab7e.com/SpatialSignalFilter Sample Recordings.zip
A poorly done YouTube video that tries to describe and demonstrate the application is available at https://youtu.be/0ZaX4UZ0gqw
As usual, comments pro and con are welcome. 73, Dave AB7E ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
