Sliding window discrete Fourier transform (SWDFT)

专利名称：Sliding window discrete Fourier transform

(SWDFT) police signal warning receiver

发明人：Steven K. Orr申请号：US16224439申请日：20181218公开号：US11061108B1公开日：20210713

专利附图：

摘要：In one embodiment, a police activity detector is provided. The detector includesa receiver section and a warning section. The receiver section is configured to receivesignals 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 analert if a received signal correlates to a law enforcement signal. The warning section alsoincludes a sliding window discrete Fourier transform (SWDFT) module configured toreceive a plurality of time series of data corresponding to sampling a received pulsedsignal 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 todetermine a magnitude of the received signal at each of the targeted frequencies, whichreveals the presence of a received pulsed signal when the magnitude is elevated, andissue an alert if the magnitude of the received signal corresponding to at least one of thetargeted frequencies is greater than or equal to a predetermined threshold.

申请人：Escort Inc.

地址：Chicago IL US

国籍：US

代理机构：K&L Gates

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