Obviously insanely impressive, but I have some doubts about the actual pervasiveness of recorded aircraft noise in casual videos.
The example with two prop planes seems a bit contrived (not that it wouldn't work with jets, they are usually just much higher up and have less distinct fundamental frequencies). Having two planes within audible range (stated at ~10 km slant range in the video) is a pretty rare event for a lot of places, even in the US with widespread general aviation.
I took a video I shot back during Covid, stripped the audio, and threw it into a quickly composed GNU Radio flowgraph, and it sure looks like there are a few doppler curves in it, and you can almost hear a propeller plane around 150 seconds in... I live near a small airport, it was a nice sunny day, so someone surely was out flying.
Obviously insanely impressive, but I have some doubts about the actual pervasiveness of recorded aircraft noise in casual videos.
The example with two prop planes seems a bit contrived (not that it wouldn't work with jets, they are usually just much higher up and have less distinct fundamental frequencies). Having two planes within audible range (stated at ~10 km slant range in the video) is a pretty rare event for a lot of places, even in the US with widespread general aviation.
I took a video I shot back during Covid, stripped the audio, and threw it into a quickly composed GNU Radio flowgraph, and it sure looks like there are a few doppler curves in it, and you can almost hear a propeller plane around 150 seconds in... I live near a small airport, it was a nice sunny day, so someone surely was out flying.
I need a better spectrograph to be sure.