Biological signal measuring apparatus

• US 9,011,343 B2
• Filed: 03/24/2010
• Issued: 04/21/2015
• Est. Priority Date: 03/25/2009
• Status: Active Grant

• Current Assignee: Citizen Watch Co Limited (Citizen Electronics Company Limited)
• Original Assignee: Citizen Holdings Co., Ltd.
• Inventors: Shimizu, Hideki
• Primary Examiner(s): HENSON, DEVIN B
• Application Number:
  US12/730,630
• Publication Number:
  US 20100249662A1
• Time in Patent Office: 1,854 Days
• Field of Search: 600/300, 600/306, 600500-503, 600/509, 600/519, 600/523, 600/527, 600/529, 600/544, 600/552, 600/587, 600/595
• US Class Current: 600/500
• CPC Class Codes: A61B 5/024 Detecting, measuring or recording pulse rate or heart rate A61B5/0205, A61B5/021 take precedence
• CPC Class Codes: A61B 5/02438 with portable devices, e.g. worn by the patient
• CPC Class Codes: A61B 5/349 Detecting specific parameters of the electrocardiograph cycle
• CPC Class Codes: A61B 5/681 Wristwatch-type devices
• CPC Class Codes: A61B 5/7203 for noise prevention, reduction or removal
• CPC Class Codes: A61B 5/7207 of noise induced by motion artifacts
• 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 5/7264 Classification of physiological signals or data, e.g. using neural networks, statistical classifiers, expert systems or fuzzy systems neural networks per se G06N3/00; expert systems per se G06N5/00

Abstract

A biological signal measuring apparatus that is provided with an oscillatory wave detection apparatus, an oscillatory wave period measuring part, a group memory apparatus that is configured to collect the periodic data and to store the periodic data as a group signal, and a vibration frequency calculation apparatus. The vibration frequency calculation apparatus is provided with a section discrimination part configured to compare the group signal with a predetermined value to carry out a section discrimination, a section memory part configured to store to a plurality of sections, a weight coefficient memory part configured to store a weight coefficient, and an oscillatory wave period weighted average value calculation part.

Claims

1. A biological signal measuring apparatus configured to detect an oscillatory wave that is generated by a biological body and to calculate data of the vibration frequency per unit time, comprising:

a pressure sensor, configured to detect an oscillatory wave that is generated by a biological body as a sensor signal and to output the sensor signal having an amplitude that is larger than an amplitude of a reference value signal as an oscillatory wave signal;

an oscillatory wave period measuring part configured to measure a time interval of the oscillatory wave signals and to output periodic data;

a group memory means configured to collect a plurality of the periodic data and to store the plurality of the periodic data as a group signal that is a data group to be measured; and

a vibration frequency calculation means configured to calculate data of the vibration frequency based on the group signal that has been stored into the group memory means,

wherein the vibration frequency calculation means comprises;

a section discrimination part configured to input the plurality of periodic data that configure the group signal and to compare the plurality of periodic data and a length of a predetermined periodic signal to carry out a section discrimination;

a section memory part configured to store the plurality of periodic data to which a section discrimination has been carried out by the section discrimination part for each section and to output section data for a plurality of sections;

a weight coefficient memory part configured to store a plurality of weight coefficients, defined by a size of an anticipated body motion noise, that correspond to the plurality of section data; and

an oscillatory wave period weighted average value calculation part configured to calculate an oscillatory wave period weighted average value from the plurality of section data and the plurality of weight coefficients corresponding to the section data,

wherein data of the vibration frequency is calculated based on the oscillatory wave period weighted average value.

2. The biological signal measuring apparatus according to claim 1, wherein:

the section discrimination part is configured to calculate a length of the predetermined periodic signal based on the plurality of periodic data.

3. The biological signal measuring apparatus according to claim 2, further comprising an indication means configured to indicate the data of the vibration frequency.

4. The biological signal measuring apparatus according to claim 1, further comprising an indication means configured to indicate the data of the vibration frequency.

5. The biological signal measuring apparatus according to claim 1, wherein all periodic data are rewritten for an update in the case in which a group signal that is stored into the group memory means is updated.

6. The biological signal measuring apparatus according to claim 1, wherein a part of periodic data is rewritten for an update in the case in which a group signal that is stored into the group memory means is updated.

7. The biological signal measuring apparatus according to claim 1, wherein the oscillatory wave is a pulse wave that is generated by the pulsation of a heart, an electrocardiographic wave that indicates an electrical activity of a heart, a skin oscillatory wave that is generated by a breath, an oscillatory wave in walking, or a brain wave.

8. A biological signal measuring method for detecting an oscillatory wave that is generated by a biological body and for calculating data of the vibration frequency per unit time, comprising:

an oscillatory wave signal generation step for detecting an oscillatory wave that is generated by a biological body as a sensor signal using a pressure sensor, and for generating the sensor signal having an amplitude that is larger than an amplitude of a reference value signal as an oscillatory wave signal;

an oscillatory wave period data generation step for generating periodic data from a time interval of the oscillatory wave signals;

a group signal generation step for collecting a plurality of the periodic data and for generating a group signal that is a data group to be measured; and

a vibration frequency calculation step for calculating data of the vibration frequency based on the group signal,

wherein the vibration frequency calculation step comprises;

a section discrimination step for comparing the plurality of periodic data and a length of a predetermined periodic signal to carry out a section discrimination based on the plurality of periodic data that configure the group signal;

a section data generation step for generating section data for a plurality of sections based on the plurality of periodic data to which a section discrimination has been carried out in the section discrimination step; and

an oscillatory wave period weighted average value calculation step for calculating an oscillatory wave period weighted average value from the plurality of section data and a plurality of weight coefficients, defined by a size of an anticipated body motion noise, that correspond to the plurality of section data,

wherein data of the vibration frequency is calculated based on the oscillatory wave period weighted average value.