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US 8,941,066 B2Granted
Apparatus and methods of infrared signal processing for motion detectors
AssigneeHoneywell International Inc.
InventorsTerry Zhao, Yang Chen, Hansen Gu
Life of this patent
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Abstract
An apparatus and method of processing signals from a passive infrared sensor evaluates energy of received signals. An integration or accumulation process can be used to provide an indicator of signal energy. This indicator can be compared to a predetermined alarm threshold to determine if an alarm indication should be generated.
Claims12
A motion detector comprising:
- an infrared sensor, the sensor having a field of view and an output port and generating a signal at the output port;
- and
- circuitry to receive and to process the signal to establish, during each of a plurality of time intervals, a respective energy parameter value, associated with the signal present during the entirety of the respective time interval, and where each respective energy parameter value is compared to a previously determined first threshold.
A method of monitoring a region comprising:
- establishing a current sample time interval;
- during the current sample time interval obtaining a movement related signal from a region being monitored;
- evaluating energy related characteristics of the signal during the entire current sample time interval and establishing a signal energy parameter value for the entire current sample time interval and comparing that value to a first predetermined threshold and if equal or greater, incrementing a count of times triggered and then returning to establishing.
Dependencies are inferred from the claim text.