Wearable heart rate monitor
First Claim
1. A method of operating a heart rate monitor of a wearable fitness monitoring device to adjust at least one setting for operating the heart rate monitor, wherein operating the heart rate monitor comprises:
- (a) operating a light source in the heart rate monitor in a skin characterization mode by emitting a succession of light pulses, at least some having variable intensity with respect to one another;
(b) detecting a variation in intensity of light from the light pulses emitted in the skin characterization mode after the light has interacted with a user'"'"'s skin;
(c) determining a mathematical function having the intensities of the succession of light pulses emitted in (a) as an input and the variation in intensity of light detected in (b) as an output, thereby obtaining a response characteristic of the user'"'"'s skin from the mathematical function or a characteristic thereof; and
(d) using the response characteristic of the user'"'"'s skin to adjust a gain and/or light emission intensity of the heart rate monitor operating in a first mode for detecting one or more characteristics of the user'"'"'s heartbeat waveform.
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Accused Products
Abstract
Some embodiments provide a wearable fitness monitoring device including a motion sensor and a photoplethysmographic (PPG) sensor. The PPG sensor includes (i) a periodic light source, (ii) a photo detector, and (iii) circuitry determining a user'"'"'s heart rate from an output of the photo detector. Some embodiments provide methods for operating a heart rate monitor of a wearable fitness monitoring device to measure one or more characteristics of a heartbeat waveform. Some embodiments provide methods for operating the wearable fitness monitoring device in a low power state when the device determines that the device is not worn by a user. Some embodiments provide methods for operating the wearable fitness monitoring device in a normal power state when the device determines that the device is worn by a user. Some embodiments provide methods for using response characteristics of the user'"'"'s skin to adjust a gain and/or light emission intensity of the heart rate monitor.
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Citations
28 Claims
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1. A method of operating a heart rate monitor of a wearable fitness monitoring device to adjust at least one setting for operating the heart rate monitor, wherein operating the heart rate monitor comprises:
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(a) operating a light source in the heart rate monitor in a skin characterization mode by emitting a succession of light pulses, at least some having variable intensity with respect to one another; (b) detecting a variation in intensity of light from the light pulses emitted in the skin characterization mode after the light has interacted with a user'"'"'s skin; (c) determining a mathematical function having the intensities of the succession of light pulses emitted in (a) as an input and the variation in intensity of light detected in (b) as an output, thereby obtaining a response characteristic of the user'"'"'s skin from the mathematical function or a characteristic thereof; and (d) using the response characteristic of the user'"'"'s skin to adjust a gain and/or light emission intensity of the heart rate monitor operating in a first mode for detecting one or more characteristics of the user'"'"'s heartbeat waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A wearable fitness monitoring device comprising:
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a motion sensor configured to provide output corresponding to motion by a user wearing the fitness monitoring device; a heart rate monitor comprising (i) a periodic light source, (ii) a photo detector positioned to receive periodic light emitted by the periodic light source after interacting with a user'"'"'s skin, and (iii) circuitry determining a user'"'"'s heart rate from an output of the photo detector; and control logic configured to; (a) operate a light source in the heart rate monitor in a skin characterization mode by emitting a succession of light pulses, at least some having variable intensity with respect to one another; (b) detect a variation in intensity of light from the light pulses emitted in the skin characterization mode after the light has interacted with the user'"'"'s skin; (c) determine a mathematical function having the intensities of the succession of light pulses emitted in (a) as an input and the variation in intensity of light detected in (b) as an output, thereby obtaining a response characteristic of the user'"'"'s skin from the mathematical function or a characteristic thereof; and (d) use the response characteristic of the user'"'"'s skin to adjust a gain and/or light emission intensity of the heart rate monitor operating in a first mode for detecting one or more characteristics of the user'"'"'s heartbeat waveform. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification