Patent ID: 11946722
Assignee: AXON ENTERPRISE, INC.
Field: Other special machines (Mechanical engineering)
Classification: CPC F  G | IPC F  G

Claim 0:
1. A system for detecting a presence of a weapon in a holster and an absence of the weapon in the holster, the system comprising:
a detector comprising a sensor circuit, a communication circuit, a memory, and a processing circuit communicatively coupled to the sensor circuit and the memory, wherein the sensor circuit is configured to detect the presence of the weapon in the holster and the absence of the weapon in the holster, wherein the sensor circuit comprises a coil and the sensor circuit provides a current to the coil to generate an electromagnetic field, and wherein the memory stores program instructions that, when executed by the processing circuit, cause the processing circuit to perform first operations comprising:
entering a calibrate mode;
while in the calibrate mode:
determining a base-line value associated with at least one of the presence of the weapon in the holster and the absence of the weapon in the holster;

entering a field mode; and
while in the field mode:
detecting a first characteristic of a signal provided by the sensor circuit that indicates the presence of the weapon in the holster, wherein detecting the first characteristic comprises determining a first magnitude of at least one of an inductance and an impedance, and comparing the first magnitude to the base-line value to determine the first magnitude indicates the weapon is inserted in the holster;
detecting a second characteristic of the signal provided by the sensor circuit that indicates the absence of the weapon in the holster, detecting the second characteristic comprises determining a second magnitude of the at least one of the inductance and the impedance, comparing the second magnitude to the base-line value to determine the second magnitude indicates the weapon is withdrawn from the holster, wherein the first magnitude is different than the second magnitude; and
responsive to detecting the second characteristic of the signal provided by the sensor circuit, wirelessly transmitting a first notice via the communication circuit;

a mount configured to position the detector with respect to the holster so that the electromagnetic field passes through a wall of the holster; and
a video recording system configured to perform second operations, comprising:
receiving the first notice; and
using information transmitted with the first notice, initiating video recording of events of an incident.