Method and apparatus for extracting biological signal such as heartbeat or respiration

• US 20060167366A1
• Filed: 05/07/2003
• Published: 07/27/2006
• Est. Priority Date: 05/07/2003
• Status: Abandoned Application

• Current Assignee: Seijiro Tomita
• Original Assignee: Seijiro Tomita
• Inventors: Tomita, Seijiro
• Application Number:
  US10/548,058
• Publication Number:
  US 20060167366A1
• Time in Patent Office: Days
• US Class Current: 600/518
• 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 5/0816 Measuring devices for examining respiratory frequency measuring frequency of electric signals G01R23/00
• CPC Class Codes: G06F 2218/08 Feature extraction

Abstract

The present invention relates to a signal detection and processing method and a device therefor designed for selecting a main periodic information from general time series signals (analog signals) involved in biological signals such as heart beat and breathing, wherein a heart rate, a respiratory rate and data fluctuations thereof are output by a sensor which detects integrated biological signals with periodicity such as heart beat and breathing of a human body.

Claims

1. A selection of biological signals such as heart beat and breathing, wherein:

forms of biological signals are modulated from time series signals (analog signals) into digital signals with an analog-to-digital modulation means;

a level data of the digital signals is the same

a changing trend (upward trend and downward trend) of the digital signals is the same; and

the most closer two points on an axis of time (in-phase points) are detected with an in-phase points detection means,

wherein after a distance between two in-phase points (running distance between in-phase points) are detected with a detection means of a running distance between in-phase points, a detected information with the detection means of a running distance between in-phase points is computed with a statistical processing means, an information after the statistical processing being analyzed with a measuring means of frequency of occurrence so as to calculate a frequency of occurrence for the same running distance, and a measurement result with the measuring means for frequency of occurrence being analyzed so as to output a most frequent running distance as a main period with a main period output means.

2. A selection device of biological signals such as heart beat and breathing comprising:

an analog-to-digital modulation means which modulates forms of biological signals such as heart beat and breathing from time series signals (analog signals) into digital signals;

an in-phase points detection means, wherein in-phase points are detected on an axis of time, the in-phase points having same level digital signals and same changing trends (upward trend and downward trend);

a detection means of a running distance between in-phase points which detects a distance between two in-phase points;

a statistical processing means which computes the information that the detection means of a running distance between in-phase points detected;

a measuring means of a frequency of occurrence which analyzes the information after statistical processing and measures a frequency of occurrence of the same running distance; and

a main period output means which analyzes the measurement result with the measuring means of a frequency of occurrence and outputs a most frequent running distance as a main period.