Sliding window discrete Fourier transform (SWDFT) police signal warning receiver
US11061108B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 18, 2018 |
| Grant date | Jul 13, 2021 |
| Priority date | — |
| Expiry date | Sep 14, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/91
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In one embodiment, a police activity detector is provided. The detector includes a receiver section and a warning section. The receiver section is configured to receive signals generated in the context of law enforcement activity. The warning section is configured to respond to a pulsed signal received by the receiver section and provide an alert if a received signal correlates to a law enforcement signal. The warning section also includes a sliding window discrete Fourier transform (SWDFT) module configured to receive a plurality of time series of data corresponding to sampling a received pulsed signal at a set of sample rates corresponding to a plurality of target frequencies, perform a SWDFT determination on each of the plurality of time series of data to determine a magnitude of the received signal at each of the targeted frequencies, which reveals the presence of a received pulsed signal when the magnitude is elevated, and issue an alert if the magnitude of the received signal corresponding to at least one of the targeted frequencies is greater than or equal to a predetermined threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.