Wearable electronic device and method for detecting heart rate

• US 10,251,570 B2
• Filed: 08/22/2016
• Issued: 04/09/2019
• Est. Priority Date: 08/28/2015
• Status: Active Grant

• Current Assignee: ASUSTek Computer, Inc.
• Original Assignee: ASUSTek Computer, Inc.
• Inventors: Hsiao, Yun-Tse, Kao, Ding-Chia
• Primary Examiner(s): Bockelman, Mark
• Application Number:
  US15/242,608
• Publication Number:
  US 20170055859A1
• Time in Patent Office: 960 Days
• CPC Class Codes: A61B 5/02416 using photoplethysmograph signals, e.g. generated by infrared radiation A61B5/14552 takes precedence
• CPC Class Codes: A61B 5/02438 with portable devices, e.g. worn by the patient

Abstract

A wearable electronic device comprising a wearable component and a device body is provided. The device body is connected to the wearable component. The device body includes a processor, a main light source, an auxiliary light source and a light sensor. The light sensor is electrically connected to the processor. An absorptivity to main rays from the main light source by human blood is more than twice of the absorptivity to auxiliary rays from the auxiliary light source. The light sensor detects intensities of the main rays and the auxiliary rays reflected by the human body. The processor corrects an error of the intensity of the main rays received by the light sensor according to the intensity of the auxiliary rays received by the light sensor to obtain a heart rate. A method for detecting a heart rate is also provided.

Claims

1. A wearable electronic device, comprising:

a wearable component, and

a device body connected to the wearable component, the device body including a processor, a main light source, an auxiliary light source and a light sensor which is electrically connected to the processor,

wherein an absorptivity to main rays from the main light source by human blood is more than twice of the absorptivity to auxiliary rays from the auxiliary light source, the light sensor detects intensities of the main rays and the auxiliary rays reflected by the human body, and the processor obtains a heart rate by;

transforming a main frequency domain curve according to changes of a reflected light intensity of the main rays received by the light sensor;

transforming an auxiliary frequency domain curve according to changes of a reflected light intensity of the auxiliary rays received by the light sensor;

determining a target main peak value from a plurality of main peak values of the main frequency domain curve that does not overlap with a plurality of auxiliary peak values of the auxiliary frequency domain curve; and

obtaining the heart rate according to the target main peak value.

2. The wearable electronic device according to claim 1, wherein wavelengths of the main rays are below 700 nm and wavelengths of the auxiliary rays are above 600 nm.

3. The wearable electronic device according to claim 1, wherein the absorptivity to the main rays by the human blood is above 1/mm.

4. The wearable electronic device according to claim 1, wherein the main light source provides the main rays and the auxiliary light source provides the auxiliary rays alternatively.

5. A method for detecting a heart rate, comprising:

exposing a human body to main rays and auxiliary rays, wherein an absorptivity to the main rays by the human blood is more than twice of the absorptivity to the auxiliary rays by the human blood;

transforming a main frequency domain curve according to changes of the reflected light intensity of the main rays;

transforming an auxiliary frequency domain curve according to changes of the reflected light intensity of the auxiliary rays;

determining a target main peak value from a plurality of main peak values of the main frequency domain curve that does not overlap with a plurality of auxiliary peak values of the auxiliary frequency domain curve; and

obtaining the heart rate according to the target main peak value.

6. The method for detecting the heart rate according to claim 5, wherein wavelengths of the main rays are below 700 nm, and wavelengths of the auxiliary rays are above 600 nm.

7. The method for detecting the heart rate according to claim 5, wherein the absorptivity to the main rays by the human blood is above 1/mm.

8. The method for detecting the heart rate according to claim 5, wherein the human body is exposed to the main rays and the auxiliary rays alternatively, and the reflected light of the main rays and the auxiliary rays are detected by a light sensor.