Period and frequency measurement device with correction device and method thereof

• US 5,759,156 A
• Filed: 02/16/1996
• Issued: 06/02/1998
• 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), Seiko Instruments Incorporated (Seiko Group)
• Inventors: Hayakawa, Motomu, Odagiri, Hiroshi, Nakamura, Chiaki, Kosuda, Tsukasa
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US08/602,651
• Time in Patent Office: 837 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 5/02438 with portable devices, e.g. worn by the patient

Abstract

A period and frequency measurement device is provided having a sensor for measuring pulse waves and body movements. A window determination circuit sets a reference value in accordance with previously measured pulse waves and body movements and determines whether currently measured pulse waves and body movements is within a window defined by upper and lower margins relative to the reference value. A window correction circuit corrects the window to be used for a next pulse waves and body movement measurement by applying a specified correction to the current pulse waves and body movements measurement if a determination result of the window determination circuit indicates that the current pulse waves and body movements measurement is outside a current window.

Claims

1. A period and frequency measurement device comprising:

sensor means for measuring pulse waves and body movements;

window determination means

for setting a reference value in accordance with previous pulse waves measured by said sensor means or body movements measurement measured by said sensor means,

for setting an upper margin and a lower margin relative to the reference value,

for defining a window having the upper margin and the lower margin and

for determining whether current pulse waves and body movements measurement measured by said sensor means is within the window;

window correction means for correcting at least one of the upper margin and the lower margin to be used for next pulse waves and body movement measurement measured by said sensor means and

pulse count calculation means for calculating a pulse rate based on current pulse waves and body movements measurement measured by said sensor means and for applying a specified correction to the current pulse waves and body movements measurement if a determination result of said window determination means indicates that the current pulse waves and body movements measurement by said sensor means is outside a current window.

2. A period and frequency measurement device comprising:

sensor means for measuring pulse waves and body movements;

window determination means

for setting a reference value in accordance with previous pulse waves measured by said sensor means and body movements measurement measured by said sensor means,

for setting an upper margin and a lower margin relative to the reference value,

for defining a window having the upper margin and the lower margin, and

for determining whether current pulse waves and body movements measurement measured by said sensor means is within the window;

window correction means for correcting at least one of the upper margin and the lower margin to be used for next pulse waves and body movement measurement measured by said sensor means, and

pulse count calculation means for calculating a pulse rate based on current pulse waves and body movements measurement measured by said sensor means and for applying a specified correction to the current ipulse waves and body movements measurement if a determination result of said window determination means indicates that the current pulse waves and body movements measurement by said sensor means is outside a current window,

wherein said window correction means further for incrementing the current pulse waves and body movements measurement and for setting a new reference value if a determination result of said window determination means indicates that the current pulse wave and body measurement exceeds the upper margin of the window and wherein said window correction means for decrementing the current pulse waves and body movement measurement for setting a new reference value if the determination result of the window determination means indicates that the current pulse waves and body movement measurement is below the lower margin of the window.

3. A period and frequency measurement device comprising:

sensor means for measuring pulse waves and body movements;

window determination means

for setting a reference value in accordance with previous pulse waves measured by said sensor means and body movements measurement measured by said sensor means,

for setting an upper margin and a lower margin relative to the reference value.

for defining a window having the upper margin and the lower margin and

for determining whether current pulse waves and body movements measurement measured by said sensor means is within the window;

window correction means for correcting at least one of the upper margin and the lower margin to be used for next pulse waves and body movement measurement measured by said sensor means, and

pulse count calculation means for calculating a pulse rate based on current pulse waves and body movements measurement measured by said sensor means and for applying a specified correction to the current pulse waves and body movements measurement if a determination result of said window determination means indicates that the current pulse waves and body movements measurement by said sensor means is outside a current window,

wherein said calculation means further for calculating status values comprising pulse rate and velocity based on the current pulse waves and body movements measurement if the determination result of said window determination means indicates that the current pulse waves and body movements measurement measured by said sensor means is within the window, and for calculating status values comprising pulse rate and velocity based on the reference values generated by said window correction means if the determination result of the window determination means indicates that the current pulse and body measurements measurement values measured by said sensor means is outside the window; and

wherein said period and frequency measurement device further comprises display means for displaying the status values calculated by said calculation means.

4. A period and frequency measurement device comprising:

sensor means for measuring pulse waves and body movements;

window determination means

for setting a reference value in accordance with previous pulse waves measured by said sensor means and body movements measurement measured by said sensor means,

for setting an upper margin and a lower margin relative to the reference value,

for defining a window having the upper margin and the lower margin, and

for determining whether current pulse waves and body movements measurement measured by said sensor means is within the window;

window correction means for correcting at least one of the upper margin and the lower margin to be used for next pulse waves and body movement measurement measured by said sensor means; and

pulse count calculation means for calculating a pulse rate based on current pulse waves and body movements measurement measured by said sensor means and for applying a specified correction to the current pulse waves and body movements measurement if a determination result of said window determination means indicates that the current pulse waves and body movements measurement by said sensor means is outside a current window, wherein said window determination means for setting the upper margin equal to the lower margin.

5. A period and frequency measurement device comprising:

body movement detection sensor means for measuring body movements;

pulse wave detection sensor means for measuring pulse wave, wherein a measurement value is defined as at least one of the body movements measured by said body movement sensor means and the pulse waves measured by said pulse wave sensor means;

window determination means

for setting a reference value based on the measurement value,

for setting an upper margin and a lower margin relative to the reference value,

for defining a window having the upper margin and the lower margin, and

for determining whether a current measurement value is within the window;

change monitoring means for monitoring a change in the measurement value by one of said body movement detection sensor means and said pulse wave detection sensor means defining a first sensor means; and

window correction means for correcting the window to be used for one of the current measurement value and a next measurement value by the other one of said body movement detection sensor means and said pulse waves detection sensor means, defining a second sensor means, based on a monitoring result of said change monitoring means.

6. The period and frequency measurement device according to claim 5, wherein said change monitoring body movement change monitoring means for monitoring body movement changes based on the measurement values of said body movement detection sensor means.

7. A period and frequency measurement device comprising:

body movement detection sensor means for measuring body movements;

pulse wave detection sensor means for measuring pulse wave, wherein a measurement value is defined as at least one of the body movements measured by said body movement sensor means and the pulse waves measured by said pulse wave sensor means;

window determination means

for setting a reference value based on the measurement value,

for setting an upper margin and a lower margin relative to the reference value,

for defining a window having the upper margin and the lower margin, and

for determining whether a current measurement value is within the window,

change monitoring means for monitoring a change in the measurement value by one of said body movement detection sensor means and said pulse wave detection sensor means defining a first sensor means; and

window correction means for correcting the window to be used for one of the current measurement value and a next measurement value by the other one of said body movement detection sensor means and said pulse waves detection sensor means, defining a second sensor means, based on a monitoring result of said change monitoring means,

wherein said window correction means for correcting the window for a next measurement value measured by said pulse wave detection sensor means, by incrementing the current measurement value measured by said pulse wave detection sensor means and using the result as a new reference value if the determination result of said window determination means indicates that the current measurement value measured by said pulse wave detection sensor means is outside the window and if the monitoring result by said body movement change monitoring means indicates that body movement has increased; and

by decrementing the current measurement value measured by said pulse wave detection sensor means and using the result as a new reference value if the determination result of said window determination means indicates that the current measurement measured by said pulse wave detection sensor means is outside the window and if the monitoring result by said body movement change monitoring means indicates that body movement has decreased.

8. The period and frequency measurement device according to claim 7, further comprising a pulse rate calculation means for calculating pulse rate based on the current measurement value if the determination result of said window determination means indicates that the current measurement measured by said pulse wave detection sensor means is within the window, and for calculating pulse rate based on the reference value generated from the measurement values by said window correction means if the determination result of the window determination means indicates that the current measurement value measured by said pulse wave detection sensor means is outside the window;

and a display means for displaying the pulse rate calculated by said pulse rate calculation means.

9. The period and frequency measurement device according to claim 7, wherein said window correction means for further performing corrections in proportion to a difference between an amount of body movement, determined based on the monitoring result of said body movement change monitoring means, and the current measurement measured by said pulse wave detection sensor means.

10. The period and frequency measurement device according to claim 7 wherein said window determination means for setting the upper margin equal to the lower margin.

11. A period and frequency measurement device comprising:

body movement detection sensor means for measuring body movements;

pulse wave detection sensor means for measuring pulse wave, wherein a measurement value is defined as at least one of the body movements measured by said body movement sensor means and the pulse waves measured by said pulse wave sensor means;

window determination means

for setting a reference value based on the measurement value,

for setting an upper margin and a lower margin relative to the reference value,

for defining a window having the upper margin and the lower margin and

for determining whether a current measurement value is within the window;

change monitoring means for monitoring a change in the measurement value by one of said body movement detection sensor means and said pulse wave detection sensor means defining a first sensor means; and

window correction means for correcting the window to be used for one of the current measurement value and a next measurement value by the other one of said body movement detection sensor means and said pulse waves detection sensor means, defining a second sensor means, based on a monitoring result of said change monitoring means,

wherein said change monitoring body movement change monitoring means for monitoring body movement changes based on the measurement values of said body movement detection sensor means,

wherein said window correction means further for correcting the window to be used for one of the current measurement value and the next measurement value measured by said pulse wave detection sensor means, for performing a first correction by widening the upper margin, if the monitoring result of said body movement change monitoring means indicates increased body movement, and for performing a second correction by widening the lower margin, if the monitoring result of said body movement change monitoring means indicates decreased body movement.

12. The period and frequency measurement device according to claim 11, wherein said window correction means for further setting the upper margin widest in the first correction, immediately after body movement increases, and subsequently for further setting the upper margin to a pre-correction state during subsequent measurements.

13. The period and frequency measurement device according to claim 11, wherein said window correction means further for narrowing the lower margin, in the first correction, immediately after body movement increases, and further for narrowing the upper margin, in the second correction, immediately after body movement decreases.

14. The period and frequency measurement device according claim 11, wherein said window correction means further for performing the first correction when the monitoring result of said body movement change monitoring means indicates increased body movement and one of the previous and the current measurement value measured by said pulse wave detection sensor means is less than a first specified value, and further for performing the second correction when the monitoring result of said body movement change monitoring means indicates decreased body movement and one of the previous and the current measurement values measured by said pulse wave detection sensor means is greater than a second specified value.

15. A user wearable device comprising:

a main body having a period and frequency measurement device comprising;

sensor means for measuring pulse waves and body movements;

window determination means

for setting a reference value in accordance with previous pulse waves measured by said sensor means and body movements measurement measured by said sensor means

for setting an upper margin and a lower margin relative to the reference value

for defining a window having the upper margin and the lower margin, and

for determining whether current pulse waves and body movements measurement measured by said sensor means is within the window; and

window correction means for correcting at least one of the upper margin and the lower margin to be used for next pulse waves and body movement measurement measured by said sensor means, by applying a specified correction to the current pulse waves and body movements measurement if a determination result of said window determination means indicates that the current pulse waves and body movements measurement by said sensor means is outside a current window, and

a band secured to said main body for removably fastening said main body to a user.

16. The user wearable device according to claim 15, wherein said window determination means for setting the upper margin equal to the lower margin.

17. The user wearable device according to claim 15 wherein said main body further comprises a watch.

18. A user wearable device comprising:

a main body having a -period and frequency measurement device comprising;

sensor means for measuring pulse waves and body movements,

window determination means

for setting a reference value in accordance with previous pulse waves measured by said sensor means and body movements measurement measured by said sensor means

for setting an upper margin and a lower margin relative to the reference value,

for defining a window having the upper margin and the lower margin, and

for determining whether current pulse waves and body movements measurement measured by said sensor means is within the window; and

window correction means for correcting at least one of the upper margin and the lower margin to be used for next pulse waves and body movement measurement measured by said sensor means, by applying a specified correction to the current pulse waves and body movements measurement if a determination result of said window determination means indicates that the current pulse waves and body movements measurement by said sensor means is outside a current window, and

a band secured to said main body for removably fastening said main body to a user,

wherein said window correction means further for incrementing the current pulse waves and body movements measurement and sets a new reference value if a determination result of said window determination means indicates that the current pulse wave and body measurement exceeds the upper margin of the window and wherein said window correction means further for decrementing the current pulse waves and body movement measurement for setting a new reference value if the determination result of the window determination means indicates that the current pulse waves and body movement measurement is below the lower margin of the window.

19. A method for measuring period and frequency comprising the steps of:

measuring pulse waves and body movements;

setting a reference value in accordance with previously measured pulse waves and body movements;

setting an upper margin and a lower margin relative to the reference value;

defining a window having the upper margin and the lower margin;

determining whether current1y measured pulse waves and body movements measurement are within the window; and

correcting at least one of the upper margin and the lower margin to be used for next pulse waves and body movement measurement, by applying a specified correction to the current pulse waves and body movements measurement if a determination result of said window determination step indicates that the current pulse waves and body movements measurement is outside a current window.

20. A method for measuring period and frequency comprising the steps of:

measuring body movements;

measuring pulse wave, wherein a measurement value is defined as at least one of the measured body movements and the measured pulse waves;

setting a reference value based on the measurement value, for setting an upper margin and a lower margin relative to the reference value;

for defining a window having the upper margin and the lower margin, determining whether a current measurement value is within the window;

monitoring a change in the measurement value in one of said body movement measurement step and said pulse wave measurement step; and

correcting the window to be used for one of the current measurement value and a next measurement value by the other one of said body movement measurement step and said pulse wave measurement step, based on a monitoring result of said change monitoring step.