Wearable LED Sensor Device that Employs a Matched Filter to Generate Biometric Samples

摘要

An LED of a wearable sensor device can be driven less frequently while still obtaining an accurate biometric sample. By reducing how frequently the LED is driven, the power required to operate the wearable sensor device is likewise reduced. To allow the LED to be driven less frequently while still obtaining an accurate biometric sample, a known lighting profile of an LED can be employed with a matched filter to generate a biometric sample from a number of samples taken while the LED is lighting. In this way, the LED only needs to be lighted for a short period of time and a reduced amount of data is stored both of which minimize the power requirements of the wearable sensor device.

主权项

1. A wearable sensor device comprising:
a housing configured to allow the wearable sensor device to be worn on a portion of the body; and a circuit for producing biometric samples, the circuit comprising:
a first LED secured to the housing in a manner that causes the first LED to face the portion of the body when the wearable sensor device is worn;a light sensor secured to the housing, the light sensor being positioned to receive light that is transmitted from the first LED and reflected from the portion of the body, the light sensor being configured to generate a first set of sensed samples representing an intensity of the reflected light during a first period of time;a matched filter configured to receive the first set of sensed samples and a first template, the matched filter performing a weighted average of the first set of sensed samples and the template to generate a first biometric sample for the first period of time; anda storage for storing the first biometric sample.