Pulse rate counter utilizing body movement amptitude detection

• US 5,776,070 A
• Filed: 02/16/1996
• Issued: 07/07/1998
• Est. Priority Date: 02/20/1995
• Status: Expired due to Term

• Current Assignee: Seiko Epson Corporation (Seiko Group), Seiko Instruments Incorporated (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Kitazawa, Kouji, Hayakawa, Motomu, Odagiri, Hiroshi
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US08/602,650
• Time in Patent Office: 872 Days
• Field of Search: 128/670, 128/687, 128/689, 128/690, 128/700, 600/483, 600/500, 600/502, 600/503, 600/513
• US Class Current: 600/483
• CPC Class Codes: A61B 5/02422 within occluders
• CPC Class Codes: A61B 5/02438 with portable devices, e.g. worn by the patient
• 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 5/7257 using Fourier transforms

Abstract

A pulse rate counter that can accurately measure pulse rate regardless of whether the user is resting or exercising is disclosed. In the pulse rate counter, a pulse wave component extraction means extracts pulse wave components based on the frequency analysis results of a first calculation means and a second calculation means. During this process, an extraction method switching means determines whether the user is resting or exercising based on the amplitude level of the signal output of a body movement signal conversion means, the level (power) of the frequency spectrum of the output signal of the second calculation means, or the degree of variation in the level. If the user is determined to be resting, the extraction method switching means causes the pulse wave component extraction means to extract the pulse wave components based on the frequency analysis result of the first calculation means.

Claims

1. A pulse rate counter, comprising:

first calculation means responsive to a pulse wave signal of a body for analyzing the frequency of the pulse wave signal and for outputting a pulse wave frequency analysis result;

second calculation means responsive to a body movement signal of the body for analyzing the frequency of the body movement signal and for outputting a body movement frequency analysis result;

pulse wave component extraction means operating in one of a first and a second extraction method for extracting pulse frequency components from the frequency analysis results output by the first and second calculation means;

extraction method switching means responsive to the body movement signal for determining an amplitude level of the body movement signal and for switching the pulse wave component extraction means to operate in one of the first and second methods according to the amplitude level of the body movement signal; and

pulse rate calculation means for converting the pulse frequency components extracted by the pulse wave component extraction means to a pulse rate.

2. The pulse rate counter of claim 1, further comprising:

pulse wave detection means for detecting the pulse wave signal of the body and being coupled to the first calculation means;

and

body movement detection means for detecting the body movement signal of the body and being coupled to the second calculation means.

3. The pulse rate counter of claim 1, further comprising display means coupled to the pulse rate calculation means for displaying the pulse rate converted by the pulse rate calculation means.

4. The pulse rate counter of claim 1, wherein the pulse wave component extraction means comprises a first extraction means operating in the first method for extracting pulse frequency components based on the frequency analysis result of the first calculation means, and a second extraction means operating in the second method for extracting pulse frequency components based on the frequency analysis results of both the first and second calculation means.

5. A pulse rate counter, comprising:

first calculation means for analyzing the frequency of a pulse wave signal of a body and outputting frequency analysis result;

second calculation means for analyzing the frequency of a body movement signal of the body and outputting frequency analysis result;

pulse wave component extraction means for extracting pulse frequency components from the frequency analysis results output by the first and second calculation means;

extraction method switching means for switching the pulse wave component extraction means to operate in a predetermined method according to the frequency spectrum level of the frequency analysis result output by the second calculation means; and

pulse rate calculation means for converting the pulse frequency components extracted by the pulse wave component extraction means to a pulse rate for display.

6. The pulse rate counter of claim 5, further comprising:

pulse wave detection means for detecting the pulse wave signal of the body; and

body movement detection means for detecting the body movement signal of the body.

7. The pulse rate counter of claim 5, further comprising display means for displaying the pulse rate converted by the pulse rate calculation means.

8. The pulse rate counter of claim 5, wherein the pulse wave component extraction means is operable in two extraction methods comprising a first extraction method for extracting pulse frequency components based on the frequency analysis result of the first calculation means, and a second extraction method for extracting pulse frequency components based on the frequency analysis results of both the first and second calculation means.

9. A pulse rate counter, comprising:

first calculation means for analyzing the frequency of a pulse wave signal of a body and outputting frequency analysis result;

second calculation means for analyzing the frequency of a body movement signal of the body and outputting frequency analysis result;

pulse wave component extraction means for extracting pulse frequency components from the frequency analysis results output by the first and second calculation means;

extraction method switching means for switching the pulse wave component extraction means to operate in a predetermined method according to the degree of variation in the levels of multiple frequency spectrums of the frequency analysis result output by the second calculation means; and

pulse rate calculation means for converting the pulse frequency components extracted by the pulse wave component extraction means to a pulse rate for display.

10. The pulse rate counter of claim 9, wherein the pulse wave component extraction means is operable in two extraction methods comprising a first extraction method for extracting pulse frequency components based on the frequency analysis result of the first calculation means, and a second extraction method for extracting pulse frequency components based on the frequency analysis results of both the first and second calculation means.

11. A wrist-mountable electronic device, comprising:

a main case; and

a pulse rate counter disposed in the main case and comprising;

pulse wave detection means for detecting a pulse wave signal of a body;

body movement detection means for detecting a body movement signal of the body;

first calculation means coupled to the pulse wave detection means for analyzing the frequency of the pulse wave signal and for outputting a pulse wave frequency analysis result;

second calculation means coupled to the body movement detection means for analyzing the frequency of the body movement signal and for outputting a body movement frequency analysis result;

pulse wave component extraction means operating in one of a first and a second extraction method for extracting pulse frequency components from the frequency analysis results output by the first and second calculation means;

extraction method switching means responsive to the body movement signal for determining an amplitude level of the body movement signal and for switching the pulse wave component extraction means to operate in one of the first and second methods according to the amplitude level of the body movement signal; and

pulse rate calculation means for converting the pulse frequency components extracted by the pulse wave component extraction means to a pulse rate; and

display means for displaying the pulse rate converted by the pulse rate calculation means.

12. The electronic device of claims 11 wherein the pulse wave component extraction means comprises a first extraction means operating in the first method for extracting pulse frequency components based on the frequency analysis result of the first calculation means, and a second extraction means operating in the second method for extracting pulse frequency components based on the frequency analysis results of both the first and second calculation means.

13. A wrist-mountable electronic device, comprising:

a main case; and

a pulse rate counter disposed in the main case and comprising;

pulse wave detection means for detecting a pulse wave signal of a body;

body movement detection means for detecting a body movement signal of the body;

first calculation means for analyzing the frequency of the pulse wave signal of the body and outputting frequency analysis result;

second calculation means for analyzing the frequency of the body movement signal of the body and outputting frequency analysis result;

pulse wave component extraction means for extracting pulse frequency components from the frequency analysis results output by the first and second calculation means;

extraction method switching means for switching the pulse wave component extraction means to operate in a predetermined method according to the frequency spectrum level of the frequency analysis result output by the second calculation means; and

pulse rate calculation means for converting the pulse frequency components extracted by the pulse wave component extraction means to a pulse rate; and

display means for displaying the pulse rate converted by the pulse rate calculation means.

14. The electronic device of claims 13 wherein the pulse wave component extraction means is operable in two extraction methods comprising a first extraction method for extracting pulse frequency components based on the frequency analysis result of the first calculation means, and a second extraction method for extracting pulse frequency components based on the frequency analysis results of both the first and second calculation means.

15. A wrist-mountable electronic device, comprising:

a main case; and

a pulse rate counter disposed in the main case and comprising;

pulse wave detection means for detecting a pulse wave signal of a body;

body movement detection means for detecting a body movement signal of the body;

first calculation means for analyzing the frequency of the pulse wave signal of the body and outputting frequency analysis result;

second calculation means for analyzing the frequency of the body movement signal of the body and outputting frequency analysis result;

pulse wave component extraction means for extracting pulse frequency components from the frequency analysis results output by the first and second calculation means;

extraction method switching means for switching the pulse wave component extraction means to operate in a predetermined method according to the degree of variation in the levels of multiple frequency spectrums of the frequency analysis result output by the second calculation means; and

pulse rate calculation means for converting the pulse frequency components extracted by the pulse wave component extraction means to a pulse rate; and

display means for displaying the pulse rate converted by the pulse rate calculation means.

16. The electronic device of claims 15 wherein the pulse wave component extraction means is operable in two extraction methods comprising a first extraction method for extracting pulse frequency components based on the frequency analysis result of the first calculation means, and a second extraction method for extracting pulse frequency components based on the frequency analysis results of both the first and second calculation means.

17. A method of measuring a pulse rate of a body, comprising:

detecting a pulse wave signal of the body;

detecting a body movement signal of the body;

analyzing the frequency of the pulse wave signal of the body to produce a first frequency analysis result;

analyzing the frequency of the body movement signal of the body to produce a second frequency analysis result;

determining an amplitude level of the body movement signal, extracting pulse frequency components from the first and second frequency analysis results in one of a first and a second method according to the amplitude level of the body movement signal;

converting the extracted pulse frequency to a pulse rate ; and

displaying the converted pulse rate.

18. A method of measuring a pulse rate of a body, comprising:

detecting a pulse wave signal of the body;

detecting a body movement signal of the body;

analyzing the frequency of the pulse wave signal of the body to produce a first frequency analysis result;

analyzing the frequency of the body movement signal of the body to produce a second frequency analysis result;

extracting pulse frequency components from the first and second frequency analysis results according to the frequency spectrum level of the second frequency analysis result; and

converting the extracted pulse frequency components to a pulse rate; and

displaying the pulse rate converted by the pulse rate calculation means.

19. A method of measuring a pulse rate, comprising:

detecting a pulse wave signal of the body;

detecting a body movement signal of the body;

analyzing the frequency of the pulse wave signal of the body to produce a first frequency analysis result;

analyzing the frequency of the body movement signal of the body to produce a second frequency analysis result;

extracting pulse frequency components from the first and second frequency analysis results according to the degree of variation in the levels of multiple frequency spectrums of the second frequency analysis result; and

converting the extracted pulse frequency components to a pulse rate; and

displaying the pulse rate converted by the pulse rate calculation means.