US Patent 9014790 Heart rate data collection
Patent 9014790 was granted and assigned to Fitbit on April, 2015 by the United States Patent and Trademark Office.
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One innovative aspect is directed to heart rate data collection. In some implementations, a circuit includes a light detector for generating a first electrical signal based on received light. The circuit includes a switching circuit, having a first and a second configuration, configured to receive a first voltage signal based on the first electrical signal and to switch among the first and the second configurations. The circuit includes first and second sampling circuits for sampling a value of the first voltage signal when the switching circuit is in the first configuration and second configurations, respectively. The circuit includes an ambient light cancellation circuit for generating a current signal to counter a first component of the first electrical signal when the first switching circuit is in the first configuration.
US Patent 09014790 Heart rate data collection US Patent 9014790 Heart rate data collection
US Patent 09014790 Heart rate data collection
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