HEART RATE DATA COLLECTION

• US 20150173631A1
• Filed: 03/06/2015
• Published: 06/25/2015
• Est. Priority Date: 06/24/2013
• Status: Active Grant

• Current Assignee: Fitbit, Inc. (Alphabet Inc.)
• Original Assignee: Fitbit, Inc. (Alphabet Inc.)
• Inventors: Richards, Peter W., Elliot, Thomas Samuel, Yuen, Shelten Gee Jao
• Granted Patent: US 10,512,407 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 2503/10 Athletes
• CPC Class Codes: A61B 2505/09 Rehabilitation or training
• CPC Class Codes: A61B 2562/0219 Inertial sensors, e.g. accelerometers, gyroscopes, tilt switches
• CPC Class Codes: A61B 5/02055 Simultaneously evaluating both cardiovascular condition and temperature
• CPC Class Codes: A61B 5/024 Detecting, measuring or recording pulse rate or heart rate A61B5/0205, A61B5/021 take precedence
• CPC Class Codes: A61B 5/02405 Determining heart rate variability
• CPC Class Codes: A61B 5/02427 Details of sensor
• CPC Class Codes: A61B 5/1112 Global tracking of patients, e.g. by using GPS
• CPC Class Codes: A61B 5/1118 Determining activity level
• CPC Class Codes: A61B 5/1123 Discriminating type of movement, e.g. walking or running A61B5/1116, A61B5/112 take precedence
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61B 5/165 Evaluating the state of mind, e.g. depression, anxiety
• CPC Class Codes: A61B 5/4806 Sleep evaluation A61B5/4821 takes precedence; devices for inducing sleep A61M21/02
• CPC Class Codes: A61B 5/4812 Detecting sleep stages or cycles
• CPC Class Codes: A61B 5/4815 Sleep quality
• CPC Class Codes: A61B 5/681 Wristwatch-type devices
• CPC Class Codes: A61B 5/7203 for noise prevention, reduction or removal
• CPC Class Codes: A61B 5/7207 of noise induced by motion artifacts
• CPC Class Codes: A61B 5/721 using a separate sensor to detect motion or using motion information derived from signals other than the physiological signal to be measured
• CPC Class Codes: A61B 5/7221 Determining signal validity, reliability or quality A61B5/7207 and A61B5/7217 take precedence
• CPC Class Codes: A61B 5/7235 : Details of waveform analysis A61B5/349 takes precedence
• CPC Class Codes: A61B 5/7264 : Classification of physiological signals or data, e.g. using neural networks, statistical classifiers, expert systems or fuzzy systems neural networks per se G06N3/00; expert systems per se G06N5/00
• CPC Class Codes: A61B 5/7282 : Event detection, e.g. detecting unique waveforms indicative of a medical condition A61B5/4094, A61B5/4818, A61B5/349, A61B5/0823 take precedence

Abstract

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.

Claims

1-28. -28. (canceled)

29. A device, comprising:

a controller, receiving a request to initiate a capture process, receipt of said request causing a gain to be set in at least a first amplifier and to operate a light emitter to emit a light signal toward a target surface;

at least a first sampling circuit operated to sample a detected incident light signal based on operation of said light emitter and to produce an analog representation of said detected light signal; and

an analog to digital converter operated to convert said analog representation of said detected incident light signal into a digital representation for further processing by said controller to complete a capture process and to disable said light emitter and said at least first sampling circuit.

30. The device of claim 29, wherein said digital representation is representative of a heartbeat of a user of said device.

31. The device of claim 29, wherein said controller is further operated to set a gain of an ambient light detection process.

32. The device of claim 31, further comprising:

a light detector operated to detect an ambient light signal, the device; and

at least a second sampling circuit sampling said ambient light signal at least partially based on said gain of said ambient light detection process to produce an analog representation of said ambient light signal for use in canceling an ambient component of said analog representation of said detected light signal.

33. The device of claim 29, further comprising:

prior to operating said light emitter to emit said light signal, disabling a zeroing of a light detector.

34. The device of claim 33 further comprising:

after said disabling of said light emitter, enabling a zeroing of said light detector.

35. The device of claim 29, further comprising:

resetting said light emitter, said at least first sampling circuit, and said at least first amplifier in preparation for a further request to perform a capture process.

36. The device of claim 32, wherein said gain of said ambient light detection process is provided to said second sampling circuit to:

adjust or select an impedance; and

generate a gain adjustment signal to adjust a gain of said analog representation of said ambient light signal.

37. The device of claim 29, wherein said gain is set based at least in part on historical data received by said controller.

38. The device of claim 32, wherein said gain of said ambient light detection process is set based at least in part on historical ambient light data received by said controller.

39. A device, comprising:

an input device, receiving a signal indicating a request to perform a sampling process;

a controller, coupled to receive said signal from said input device, and operable to set a gain of at least a first amplifier in at least a first sampling circuit;

cause a light emitter to emit a light signal;

operate said at least first sampling circuit to sample a detected incident light signal to produce an analog representation of said detected incident light signal;

operate an analog to digital converter to convert said analog representation of said detected incident light signal into a digital representation for further processing by said controller; and

disabling said light emitter and said at least first sampling circuit in response to said operating said analog to digital converter.

40. The device of claim 39, wherein said detected incident light signal is a light signal obtained from a target.

41. The device of claim 39, wherein said controller is further operable to:

set a gain of an ambient light detection process;

cause a light detector to detect an ambient light signal; and

capture sample said ambient light signal at least partially based on said gain of said ambient light detection process to produce an analog representation of said ambient light signal.

42. The device of claim 41, wherein said analog representation of said detected incident light signal is countered by said analog representation of said ambient light signal.

43. The device of claim 42, wherein said operating of said analog to digital converter is performed after a first delay period, said first delay period selected to allow said detected incident light signal to be countered by said analog representation of said ambient light signal.

44. The device of claim 42, wherein said operating of said analog to digital converter is performed after a first delay period, said first delay period selected to allow said analog to digital to settle to a known state.

45. The device of claim 39, wherein said controller is further operable to:

prior to causing said light emitter to emit said light signal, disable a zeroing of a light detector.

46. The device of claim 45, wherein said controller is further operable to:

after said disabling of said light emitter, enable a zeroing of said light detector.

47. The device of claim 39, wherein said controller is further operable to:

reset said light emitter, said at least first sampling circuit, and said at least first amplifier in preparation for a further request to perform a sampling process.

48. The device of claim 41, wherein said sampling said ambient light signal is performed using a second sampling circuit, wherein said gain of said ambient light detection process is provided to said second sampling circuit to:

adjust or select an impedance; and

generate a gain adjustment signal to adjust a gain of said analog representation of said ambient light signal.

49. The device of claim 39, wherein said gain of at least said first amplifier is set based at least in part on historical data received by said controller.

50. The device of claim 41, wherein said gain of said ambient light detection process is set based at least in part on historical ambient light data received by said controller.

51. The device of claim 39, wherein said digital representation is representative of a detected heartbeat of a user.