Occupancy detection system and method having automatic adaptation capabilities
First Claim
1. An occupancy detection system comprising:
- a motion detector effective to provide an output signal based on detected motion in a defined area;
a sound detector effective to provide an output signal based on detected sound in the defined area; and
a lighting controller effective todetermine a first occupancy state based on a received motion detector output signal and a second occupancy state based on a received sound detector output signal,control one or more associated lighting devices to be turned from OFF to ON in accordance with a determined first occupancy state of ON,control the lighting devices to be turned from ON to OFF in accordance with determined first and second occupancy states of OFF for longer than a timeout period,record time stamps in association with events causing the lighting devices to be turned OFF and in association with events causing the lighting devices to be turned ON, andautomatically adjust the timeout period upon receiving new time stamps based on a second order occupancy distribution analysis including each of the recorded time stamps and comprising an occupancy curve having a mean and a variance associated with a Gaussian probability distribution function, the occupancy curve being adjusted for each newly recorded set of time stamps and the timeout period being adjusted according to the mean and variance of the occupancy curve.
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Accused Products
Abstract
An occupancy detection system includes a motion detector, one or more sound detectors and a lighting controller configured to turn on and off one or more lighting devices in a defined area based on detected occupancy states. Lighting control circuitry determines occupancy states based on motion detector output signals and sound detector output signals, and further controls associated lighting devices to be turned ON or OFF in accordance with determined occupancy states and an automatically adaptable timeout period. The timeout period is automatically adjusted in accordance with newly recorded time stamps for lighting status changes, based on a second order occupancy distribution analysis such as a Gaussian probability distribution function, with an occupancy curve adjusted for each newly recorded set of time stamps and the timeout period being adjusted according to the mean and variance of the occupancy curve.
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Citations
18 Claims
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1. An occupancy detection system comprising:
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a motion detector effective to provide an output signal based on detected motion in a defined area; a sound detector effective to provide an output signal based on detected sound in the defined area; and a lighting controller effective to determine a first occupancy state based on a received motion detector output signal and a second occupancy state based on a received sound detector output signal, control one or more associated lighting devices to be turned from OFF to ON in accordance with a determined first occupancy state of ON, control the lighting devices to be turned from ON to OFF in accordance with determined first and second occupancy states of OFF for longer than a timeout period, record time stamps in association with events causing the lighting devices to be turned OFF and in association with events causing the lighting devices to be turned ON, and automatically adjust the timeout period upon receiving new time stamps based on a second order occupancy distribution analysis including each of the recorded time stamps and comprising an occupancy curve having a mean and a variance associated with a Gaussian probability distribution function, the occupancy curve being adjusted for each newly recorded set of time stamps and the timeout period being adjusted according to the mean and variance of the occupancy curve. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An occupancy detection network comprising:
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one or more motion detection modules configured to be positioned in each of one or more defined areas and each effective to provide an output signal based on detected motion in an associated area; one or more sound detection modules configured to be positioned in each of the defined areas and further comprising circuitry effective to generate an ON output signal when sound is detected in an associated area during an OFF lighting state, generate an OFF output signal when a timeout period lapses with no sound detected during an ON lighting state, record time stamps in association with sound detection events, and automatically adjust the timeout period upon recording new time stamps based on a second order occupancy distribution analysis further including each of the previously recorded time stamps and comprising an occupancy curve having a mean and a variance associated with a Gaussian probability distribution function, the occupancy curve being adjusted for each newly recorded set of time stamps and the timeout period being adjusted according to the mean and variance of the occupancy curve; each of said motion detection modules and said sound detection modules configured to be assigned an address associated with an area in which they are positioned; and a central lighting controller configured to be functionally linked to each of the motion detection modules and sound detection modules via a common bidirectional data bus, and effective to control one or more associated lighting devices to be turned on and off in accordance with output signals received from the detection modules. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A sound detection module for use with a lighting controller associated with a defined area, the sound detection module comprising:
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one or more sound detectors effective to generate signals associated with sound in the defined area; and sound detection control circuitry effective to generate an ON output signal to the lighting controller when sound is detected in an associated area during an OFF lighting state, generate an OFF output signal to the lighting controller when a timeout period lapses with no sound detected during an ON lighting state, record time stamps in association with sound detection events, and automatically adjust the timeout period based on a second order occupancy distribution analysis comprising an occupancy curve having a mean and a variance associated with a Gaussian probability distribution function, the occupancy curve including previously recorded time stamps and being adjusted for each newly recorded set of time stamps, and the timeout period being adjusted according to the mean and variance of the occupancy curve. - View Dependent Claims (16)
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17. A motion detection module for use with a lighting controller associated with a defined area, the motion detection module comprising:
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a motion detector effective to generate signals associated with motion in the defined area; and motion detection sensitivity control circuitry effective to generate an ON output signal to the lighting controller when motion is detected in an associated area during an OFF lighting state, generate an OFF output signal to the lighting controller when a timeout period lapses with no motion detected during an ON lighting state, record time stamps in association with motion detection events, and automatically adjust the timeout period based on a second order occupancy distribution analysis comprising an occupancy curve having a mean and a variance associated with a Gaussian probability distribution function, the occupancy curve including previously recorded time stamps and being adjusted for each newly recorded set of time stamps, and the timeout period being adjusted according to the mean and variance of the occupancy curve. - View Dependent Claims (18)
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Specification