ALEXANDRIA, Va., Sept. 3 -- United States Patent no. 12,406,577, issued on Sept. 2, was assigned to Waymo LLC (Mountain View, Calif.).
"Phase lock loop siren detection" was invented by Ganesh Balachandran (Mountain View, Calif.).
According to the abstract* released by the U.S. Patent & Trademark Office: "One example system for detecting an emergency siren comprises a microphone device, a band pass filter operably coupled to the microphone device and configured to filter sound data from the microphone device to produce filtered sound data, a phase lock loop circuit configured to phase filter the filtered sound data to produce phase filtered data, and a processor configured to determine a presence of a siren signal from the phase filtered d...