JP2000041962A - Heartbeat signal processing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify mounting and equip with a heartbeat sensor that does not involve any feeling of incompatibility and the inconvenience of mounting by providing a signal processing means extracting a heartbeat waveform in accordance with electrical signals detected from electrodes provided in two places of the ear contact portions or the nose contact portion of a eyeglass type frame. SOLUTION: Electrodes 1 and 2 are attached to the ear contact portions of right and left earpieces 4 and 5 provided on an eyeglass type frame 6. And a voltage signal as an electrical signal detected from the electrodes 1 and 2, is sent to a signal processing means 10 from signal wires 7 and 8. At this time, the electrode 1 attached to the right or left earpiece 4, 5 of the eyeglass type frame 6 is made a reference electrode and the electrode 2 is made a signal electrode. When this eyeglass type frame 6 is worn, the electrodes 1 and 2 contact the right and left ears of a wearer and a potential difference between the right and left ears produced in association with the pulsation of blood of the wearer appears in the electrodes 1 and 2. By detecting this potential difference, the device can know a pulse of the heat, that is, a heartbeat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heartbeat signal processing apparatus for extracting a heartbeat waveform of a human body.

[0002]

2. Description of the Related Art Conventionally, as a method for detecting a heart rate or a pulse, as disclosed in Japanese Patent Application Laid-Open No. 55-78934, a configuration is adopted in which an earlobe is sandwiched between a light source and a photoelectric element, and the earlobe is inserted from the light source. And a reflection type light-emitting / emitting device that detects light from a light-emitting unit, reflects the light from a light-emitting unit, receives the reflected light at a light-receiving unit, and detects the heartbeat. Some use forehead contact type sensors.

[0003]

However, the conventional earlobe-type sensor has a troublesome operation during mounting.
The wearer was giving a sense of incongruity. Further, the sensor of the type that comes into contact with the forehead has a problem that a burden is imposed on the wearer because the mounting method is complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a heart rate signal processing apparatus provided with a heart rate sensor which makes mounting easier and does not cause discomfort during mounting or troublesome mounting. It is in.

[0005]

According to the present invention, in order to achieve the above object, the left and right ear contact portions of the spectacle-shaped frame contacting the wearer's ear and the nose contact portion contacting the wearer's nose are provided. It is characterized by comprising electrodes provided at any two of them, and signal processing means for extracting a heartbeat waveform according to an electric signal detected from each of the electrodes.

[0006] Further, three electrodes provided on the left and right ear contact portions of the spectacle-shaped frame that contact the wearer's ear and the nose contact portion that contacts the wearer's nose, and one of the electrodes is provided. A signal for extracting a heartbeat waveform by differentially amplifying a signal detected from the reference electrode and the other electrode and a signal detected from the reference electrode and the other electrode as a reference electrode. And processing means.

[0007]

(Embodiment 1) FIG. 1 is a perspective view showing a state in which electrodes are attached to an eyeglass-type frame.
Reference numerals 1 and 2 denote left and right vines 4 provided on the eyeglass-type frame 6.
No. 5 is an electrode attached to each of the ear contact portions that contact the ears. Voltage signals, which are electric signals detected from the respective electrodes 1 and 2, are sent to signal processing means 10 via signal lines 7 and 8.

At this time, the electrode 1 attached to each of the right and left temples of the spectacle frame 6 is a reference electrode, and the electrode 2 is a signal electrode. When this spectacle type frame 6 is attached,
Each of the electrodes 1 and 2 comes into contact with the left and right ears of the wearer, and a potential difference between the left and right ears generated with the pulsation of the blood of the wearer appears on the electrodes 1 and 2. By detecting this potential difference, the pulse of the heart, that is, the heartbeat can be determined.

FIG. 2 is a block diagram showing the internal configuration of the signal processing means 10. The potential difference signal A detected from the electrode 1 serving as a reference electrode and the electrode 2 serving as a signal electrode is supplied to an amplifier circuit 20.
, And a frequency band which is regarded as noise by the filter circuit 21 is removed, and the heartbeat signal B is output. The heartbeat signal B appears as the heartbeat waveform shown in FIG. 3, and the heart rate is calculated based on the pulse interval of this waveform.

In this embodiment, a total of two electrodes are provided on each of the left and right ear contact portions of the spectacle frame 6.
The nose contact portion 11 which contacts the nose of the wearer and the left ear contact portion 2
For example, electrodes may be provided at any two places of the nose contact part and the ear contact parts of both ears, such as providing electrodes at the places, and the heartbeat waveform may be extracted from the potential difference signal of the electrode detected from each. (Embodiment 2) FIG. 4 is a perspective view showing a state in which electrodes are mounted on a spectacle type frame according to a second embodiment of the present invention. Is omitted. The difference from FIG. 1 is that a new electrode 3 is provided on a nose contact portion 11 that contacts the nose of the wearer of the spectacle-shaped frame 6, and a signal is sent to the signal processing means 10 through the signal line 9.

When the glasses-type frame 6 is worn, the electrodes 3 come into contact with the operator's nose, and the electrodes 1 and 2 come into contact with the left and right ears of the wearer. At this time, if the electrode 1 attached to the left ear contact portion of the eyeglass frame 6 is a reference electrode, and the electrodes 2 and 3 attached to the right ear contact portion and the nose contact portion are signal electrodes, As the blood pulsates, potential differences are generated between the electrode 1 serving as the reference electrode and the electrode 2 serving as the signal electrode, and between the electrode 1 serving as the reference electrode and the electrode 3 serving as the signal electrode.

FIG. 5 is a block diagram showing the internal configuration of the signal processing means 10. The potential difference signal C detected from the electrode 1 as the reference electrode and the electrode 2 as the signal electrode is a waveform diagram shown in FIG. The potential difference signal D detected from the electrode 1 serving as the reference electrode and the electrode 3 serving as the signal electrode has a waveform diagram shown in FIG. 6B. These waveform diagrams shown in FIGS. 6A and 6B have opposite phases of positive and negative and have the same period.

These potential difference signals C and D are differentially amplified by a differential amplifier circuit 30, and a frequency band which is regarded as noise is removed by a filter circuit 31, and a heartbeat signal E is output. The heartbeat signal appears as a heartbeat waveform shown in FIG. 7, and the heart rate is calculated based on the pulse interval of this waveform.

At this time, since the potential difference signals C and D are voltage signals of opposite phases, the waveform shown in FIG. 7 corresponding to the differential signal differentially amplified by the differential amplifier circuit 31 is shown in FIG. The waveform becomes sharper than the waveform shown, and the signal extraction accuracy is improved. In addition, in-phase noise is removed at the stage of differential amplification, so that the SN ratio is improved.

In this embodiment, the eyeglass-type frame 6 is used.
The electrode 1 attached to the left ear contact portion was a reference electrode, the electrodes 2 and 3 attached to the right ear contact portion and the nose contact portion were signal electrodes, but the reference electrode was attached to the right ear contact portion. The electrode arrangement may be changed so that the electrode 2 is attached and the remaining electrodes 1 and 3 are signal electrodes.

[0016]

According to the first aspect of the present invention, at least two of the left and right ear contact portions of the spectacle frame contacting the wearer's ear and the nose contact portion contacting the wearer's nose. Since the heartbeat waveform is extracted in accordance with the electrodes provided in and the electrical signals detected from each of the electrodes, it is possible to extract the heartbeat signal only by wearing the glasses-type frame, and Can eliminate the discomfort and troublesome mounting.

In the invention of claim 2 of the present invention,
Three electrodes provided on the left and right ear contact portions of the spectacle-shaped frame contacting the wearer's ear and the nose contact portion contacting the wearer's nose, and any one of the electrodes as a reference electrode; Signal processing means for differentially amplifying a signal detected from the reference electrode and the remaining one electrode and a signal detected from the reference electrode and the other remaining electrode to extract a heartbeat waveform; Therefore, in-phase noise can be removed at the stage of amplification, and the SN ratio is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which an electrode is attached to an eyeglass-type frame according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an internal configuration of a signal processing unit according to the first embodiment of the present invention.

FIG. 3 is a waveform chart showing a heartbeat waveform extracted in the first embodiment of the present invention.

FIG. 4 is a perspective view showing a state in which electrodes are attached to an eyeglass-type frame according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing an internal configuration of a signal processing unit according to a second embodiment of the present invention.

6A is a waveform chart showing a potential difference between an electrode 1 and an electrode 2, and FIG. 6B is a waveform chart showing a potential difference between an electrode 1 and an electrode 3 in a second embodiment of the present invention.

FIG. 7 is a waveform chart showing a heartbeat waveform extracted in the second embodiment of the present invention.

[Explanation of symbols]

 1, 2 electrode 6 glasses type frame 10 signal processing means

Claims (2)

[Claims] An electrode provided at any two of a left and right ear contact portion of a spectacle-shaped frame that contacts an ear of a wearer, a nose contact portion that contacts a nose of the wearer, and each of the electrodes A signal processing means for extracting a heartbeat waveform in accordance with an electrical signal detected from the heartbeat signal. 2. Three electrodes provided on left and right ear contact portions of a spectacle-shaped frame contacting the wearer's ear and a nose contact portion contacting the wearer's nose, and one of the electrodes is provided. A signal for extracting a heartbeat waveform by differentially amplifying a signal detected from the reference electrode and the other electrode and a signal detected from the reference electrode and the other electrode as a reference electrode. A heartbeat signal processing device comprising processing means.