Belkin International, Inc.

Stacy Tantum

Yael Gregory Maguire

Matthew Stephen Reynolds

Shwetak N Patel

Karthik Yogeeswaran

Charles Gillen-O'Neel

Ameet V Joshi

Some embodiments concern a method of detecting usage of one or more electrical devices coupled to an electrical power line. An electrical power signal with a predetermined period is on the electrical power line. The one or more electrical devices place one or more noise signals on the electrical power line. The electrical power signal comprises the one or more noise signals. The method can include: using a data acquisition device to acquire first data about the electrical power signal on the electrical power line such that the acquiring of the first data is synchronized with the predetermined period of the electrical power signal; processing the first data to create frequency domain data; and applying a feature extraction algorithm to the frequency domain data to determine a transition of an electrical state of at least a first one of the one or more electrical devices. Other embodiments are disclosed.

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Durham, NC, United States of America

Stacy Tantum