SYSTEMS AND METHODS FOR SENSING ENVIRONMENTAL CHANGES USING EMI SIGNAL SOURCES AS SENSORS
First Claim
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1. A method comprising:
- operating an electromagnetic interference (EMI) signal source, wherein the signal source generates an EMI signal through internal operation of the signal source;
receiving the EMI signal at a power line;
identifying at least one frequency of the EMI signal for monitoring, wherein the at least one frequency is based on the internal operation of the signal source; and
detecting an environmental change based on changes in the EMI signal and the at least one frequency.
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Abstract
Systems and methods for sensing environmental changes using electromagnetic interference (EMI) signals are disclosed herein. An EMI monitoring system may be used to monitor an EMI signal of one or more EMI signal sources provided over a power line, e.g., in a home or building. The received EMI energy at the power line may be analyzed to detect variations in the EMI signature indicative of environmental changes occurring in the proximity of the signal sources. Examples include detection of gestures on or near liquid crystal displays using EMI signals generated by internal operation of the liquid crystal displays.
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Citations
24 Claims
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1. A method comprising:
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operating an electromagnetic interference (EMI) signal source, wherein the signal source generates an EMI signal through internal operation of the signal source; receiving the EMI signal at a power line; identifying at least one frequency of the EMI signal for monitoring, wherein the at least one frequency is based on the internal operation of the signal source; and detecting an environmental change based on changes in the EMI signal and the at least one frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electromagnetic interference monitoring system comprising:
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a power network interface configured to receive an electromagnetic interference signal over a power network from internal operation of an electromagnetic interference (EMI) signal source; and at least one processing unit and at least one computer readable medium encoded with instructions that, when executed, cause the at least one processing unit to; process the electromagnetic interference signal; and sense an environmental change based on a variation in the processed electromagnetic interference signal according to one or more criteria, wherein the environmental change caused the variation in the electromagnetic interference signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A method, comprising:
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monitoring a frequency on a power network, the frequency selected based, at least in part, on a row rate of an liquid crystal display; receiving an electromagnetic interference signal having the frequency from the liquid crystal display;
processing the electromagnetic interference signal; andafter processing the electromagnetic interference signal, sensing a gesture made on or near the liquid crystal display based, at least in part, on one or more variations of the electromagnetic interference signal. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification