Biosignal-detecting apparatus and method thereof

• US 20100286533A1
• Filed: 10/19/2007
• Published: 11/11/2010
• Est. Priority Date: 11/27/2006
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: SHIN, Kun Soo, LEE, Mi Hee, BAE, Soo Hyun, KIM, Jong Pal
• Application Number:
  US11/976,075
• Publication Number:
  US 20100286533A1
• Time in Patent Office: Days
• US Class Current: 600/484
• CPC Class Codes: A61B 5/0205 Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
• CPC Class Codes: A61B 5/02444 Details of sensor A61B5/02427 takes precedence
• CPC Class Codes: A61B 5/05 Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves impedance plethysmography A61B5/0295; measuring movement of the entire body or parts thereof A61B5/11; detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof A61B5/24
• CPC Class Codes: A61B 5/0507 using microwaves or terahertz waves
• CPC Class Codes: A61B 5/0816 Measuring devices for examining respiratory frequency measuring frequency of electric signals G01R23/00
• CPC Class Codes: A61B 5/1114 Tracking parts of the body
• CPC Class Codes: A61B 5/1135 by monitoring thoracic expansion
• CPC Class Codes: G01S 13/58 Velocity or trajectory determination systems; Sense-of-movement determination systems
• CPC Class Codes: G01S 13/88 Radar or analogous systems specially adapted for specific applications electromagnetic prospecting or detecting of objects, e.g. near-field detection, G01V3/00

Abstract

A method of detecting a biosignal includes; measuring a biosignal from a user; band pass filtering the biosignal to each of a first frequency band and/or a second frequency band, and detecting a first frequency band signal and/or a second frequency band signal; calculating a PSD of the first frequency band signal and detecting a frequency band signal with a maximum PSD in the first frequency band as a heartbeat signal of the user; and calculating a PSD of the second frequency band signal and/or detecting a frequency band signal with a maximum PSD in the second frequency band as a respiration signal of the user.

Claims

1. A method of detecting a biosignal, the method comprising:

measuring a biosignal from a user;

band pass filtering the biosignal to a frequency band; and

calculating a power spectrum density (PSD) of the band pass filtered signal and detecting a frequency band signal with a maximum PSD.

2. The method of claim 1, wherein the biosignal is detected from the user using either a Doppler radar sensor, or a piezoelectric sensor and a radio frequency (RF) sensor.

3. The method of claim 1, wherein the frequency band is within a range of about 1.0 Hz to about 1.5 Hz.

4. The method of claim 1, wherein the frequency band is set to a predetermined band based on a heart rate that is measured from the user for a predetermined period of time when the user is at rest.

5. The method of claim 1, further comprising:

comparing a PSD value of the heartbeat signal with a predetermined threshold value; and

providing an alarm signal when the PSD value of the heartbeat signal is less than the predetermined threshold value as a result of the comparison.

6. The method of claim 5, wherein the predetermined threshold value is set to a value corresponding to about 80% of a previously measured PSD value of the user'"'"'s heartbeat signal.

19. A computer-readable recording medium storing a program for implementing the method according to claim 1.

7. A method of detecting a biosignal, the method comprising:

measuring a biosignal from a user;

band pass filtering the biosignal to a frequency band; and

calculating a PSD of the band pass filtered signal and detecting a frequency band signal with a maximum PSD as a respiration signal of the user.

8. The method of claim 7, wherein the biosignal is detected from the user using either a Doppler radar sensor, or a piezoelectric sensor and an RF sensor.

9. The method of claim 7, wherein the frequency band is within the range of about 0.2 Hz to about 0.35 Hz.

10. The method of claim 7, wherein the frequency band is set to a predetermined band based on a respiration rate that is measured from the user for a predetermined period of time when the user is at rest.

11. The method of claim 7, further comprising:

comparing a PSD value of the respiration signal with a predetermined threshold value; and

determining the user is in a breathless state when the PSD value of the respiration signal is less than the predetermined threshold value as a result of the comparison.

12. The method of claim 11, wherein the predetermined threshold value is set to a value corresponding to about 80% of a previously measured PSD value of the user'"'"'s respiration signal.

13. A method of detecting a biosignal, the method comprising:

measuring a biosignal from a user;

band pass filtering the biosignal to each of a first frequency band and a second frequency band, and detecting a first frequency band signal and a second frequency band signal;

calculating a PSD of the first frequency band signal and detecting a frequency band signal with a maximum PSD in the first frequency band as a heartbeat signal of the user; and

calculating a PSD of the second frequency band signal and detecting a frequency band signal with a maximum PSD in the second frequency band as a respiration signal of the user.

14. The method of claim 13, wherein the biosignal is detected from the user using either a Doppler radar sensor, or a piezoelectric sensor and an RF sensor.

15. The method of claim 13, wherein the first frequency band is within a range of about 1.0 Hz to about 1.5 Hz, and the second frequency band is within a range of about 0.2 Hz to about 0.35 Hz.

16. The method of claim 13, wherein each of the first frequency band and the second frequency band is set to a predetermined band based on a heart rate and a respiration rate that are measured from the user for a predetermined period of time when the user is at rest.

17. The method of claim 13, further comprising:

comparing a PSD value of the heartbeat signal with a first threshold value, and comparing a PSD value of the respiration signal with a second threshold value;

providing an alarm signal when the PSD value of the heartbeat signal is less than the first threshold value as a result of the comparison; and

determining the user is in a breathless state when the PSD value of the respiration signal is less than the second threshold value as a result of the comparison.

18. The method of claim 17, wherein the first threshold value is set to a value corresponding to 80% of a previously measured PSD value of the user'"'"'s heartbeat signal, and the second threshold value is set to a value corresponding to 80% of a previously measured PSD value of the user'"'"'s respiration signal.

20. An apparatus for detecting a biosignal, comprising:

a sensor unit measuring a biosignal from a user;

a filter unit band pass filtering the biosignal to each of a first frequency band and a second frequency band, and detecting a first frequency band signal and a second frequency band signal;

a PSD calculation unit calculating PSDs of the first frequency band signal and the second frequency band signal; and

a signal detection unit detecting a frequency band signal with a maximum PSD in the first frequency band as a heartbeat signal of the user, and detecting a frequency band signal with a maximum PSD in the second frequency band as a respiration signal of the user.

21. The apparatus of claim 20, wherein the sensor unit includes either a Doppler radar sensor, or a piezoelectric sensor and an RF sensor.

22. The apparatus of claim 20, wherein the first frequency band is within the range of about 1.0 Hz to about 1.5 Hz, and the second frequency band is within the range of about 0.2 Hz to about 0.35 Hz.

23. The apparatus of claim 20, wherein each of the first frequency band and the second frequency band is set to a predetermined band based on a heart rate and a respiration rate that are measured from the user for a predetermined period of time when the user is at rest.

24. The apparatus of claim 20, further comprising:

a tracking unit comparing a PSD value of the heartbeat signal with a first threshold value and generating an alarm signal when the PSD value of the heartbeat signal is less than the first threshold value as a result of the comparison, and comparing a PSD value of the respiration signal with a second threshold value and determining the user is in a breathless state when the PSD value of the respiration signal is less than the second threshold value as a result of the comparison.

25. The apparatus of claim 24, wherein the tracking unit sets the first threshold value to a value corresponding to about 80% of a previously measured PSD value of the user'"'"'s heartbeat signal, and sets the second threshold value to a value corresponding to 80% of a previously measured PSD value of the user'"'"'s respiration signal.