Vital signs measurement system, detecting method of the vital signs measurement system, and vital signs measurement earphone
AssigneeCheng Uei Precision Industry Co., Ltd.
InventorsCheng Lee, Kuo Yang Wu, Wen-Bing Hsu, Hsiang-Ling Chung
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Abstract
A vital signs measurement system includes a plurality of light sources emitting into a subject's skin. A plurality of photo sensors receives lights reflected from the subject's skin and converts the lights to a plurality of signals. A processing module receives the plurality of signals and transforms the plurality of signals to a PPG signal by analyzing a correlation coefficient between every two ones of the plurality of signals. The vital signs measurement system improves the measurement accuracy of the physiological information of the participant by the correlation coefficient.
Claims9
A vital signs measurement system to monitor heartbeat of a subject, comprising:
- a plurality of light sources adapted to emit light into a subject's skin;
- a plurality of photo sensors adapted to receive light reflected from the subject's skin and converting the received light to a plurality of signals;
- a processing module receiving the plurality of signals and transforming the plurality of signals to a PPG (Photoplethysmography) signal by calculating a correlation coefficient between every two ones of the plurality of signals, the correlation coefficient being calculated as follows:
- R
- xy
- =
- Σ
- i
-
- [
- (
- x
- i
- -
- x
- _
- )
-
- (
- y
- i
- -
- y
- _
- )
- ]
- Σ
- i
-
- (
- x
- i
- -
- x
- _
- )
- 2
- ·
- Σ
- i
-
- (
- y
- i
- -
- y
- _
- )
- 2
- where Rxy is the correlation coefficient between the every two ones of the plurality of signals, x and y are two signal values corresponding to the every two ones of the plurality of signals respectively;
- wherein if the correlation coefficient is within an allowable value, then sum all of the plurality of signals to obtain the PPG signal;
- if not, use a following formula to get a correlation signal between the every two ones of the plurality of signals, the correlation signal is expressed in Sxy:
- S=(1−Rxy)(x+y)
- then sum all of the correlation signal Sxy to obtain the PPG signal to monitor heartbeat of the subject.
A vital signs measurement earphone, comprising:
- an earphone body equipped with a processing module therein;
- an insert element located at one side of the earphone body;
- a light-permeable earplug mounted at a free end of the insert element;
- a plurality of light sources disposed at a periphery of the insert element, lights from the plurality of light sources penetrating through the light-permeable earplug at different angles along radial directions of the insert element respectively onto a subject's ear canal wall;
- and
- a plurality of photo sensors disposed at the periphery of the insert element, the photo sensors adapted to receive lights reflected by the subject's ear canal wall and then converting the reflected lights to a plurality of signals;
- wherein the processing module receives the plurality of signals and transforms the plurality of signals to a PPG (Photoplethysmography) signal by calculating a correlation coefficient between every two ones of the plurality of signals, the correlation coefficient is calculated as follows:
- R
- xy
- =
- Σ
- i
-
- [
- (
- x
- i
- -
- x
- _
- )
-
- (
- y
- i
- -
- y
- _
- )
- ]
- Σ
- i
-
- (
- x
- i
- -
- x
- _
- )
- 2
- ·
- Σ
- i
-
- (
- y
- i
- -
- y
- _
- )
- 2
- where Rxy is the correlation coefficient between the every two ones of the plurality of signals, x and y are two signal values corresponding to the every two ones of the plurality of signals respectively, if the correlation coefficient is within an allowable value, then sum all of the plurality of signals to obtain the PPG signal;
- if not, use a following formula to get a correlation signal between the every two ones of the plurality of signals, the correlation signal is expressed in Sxy:
- Sxy=(1−Rxy)(x+y)
- then sum all of the correlation signal Sxy to obtain the PPG signal to monitor heartbeat of the subject.
Dependencies are inferred from the claim text.