Cellular radios also have this capability. There's work done to track individuals in this way (matching your walking pattern/gait). https://news.ycombinator.co

Cellular radios also have this capability. There's work done to track individuals in this way (matching your walking pattern/gait). https://news.ycombinator.com/item?id=44416761 https://news.ycombinator.com/item?id=44416761 Signal processing is probably a general problem. This month we had news about transcribing speech from sound waves jiggling a regular computer mouse. https://www.theregister.com/2025/10/07/mouse_microphone_security/ https://www.theregister.com/2025/10/07/mouse_microphone_secu...