JPH0687842B2 - Biological signal artifact detector - Google Patents
Biological signal artifact detectorInfo
- Publication number
- JPH0687842B2 JPH0687842B2 JP59227782A JP22778284A JPH0687842B2 JP H0687842 B2 JPH0687842 B2 JP H0687842B2 JP 59227782 A JP59227782 A JP 59227782A JP 22778284 A JP22778284 A JP 22778284A JP H0687842 B2 JPH0687842 B2 JP H0687842B2
- Authority
- JP
- Japan
- Prior art keywords
- electrocardiogram
- threshold voltage
- baseline drift
- biological signal
- potential difference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000001514 detection method Methods 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Description
【発明の詳細な説明】 本発明は心電図信号等を生体より検出する際に生じる基
線ドリフトを検出する心電図アーチファクト検出装置に
関する。The present invention relates to an electrocardiogram artifact detection device that detects a baseline drift that occurs when an electrocardiogram signal or the like is detected from a living body.
心電図信号は第３図に示す如くＰ波、QRS波及びＴ波に
より構成される。各棘波において、これらの形状、振幅
及び波高等の変化は、心臓の異常を示す要素となる。一
方、第３図におけるＰ−Ｑ部分は、機能的に心臓が休止
している状態であり、各棘波の振幅やＳ−Ｔレベル値を
計測する場合の基準値として利用されている。以下、心
電図中に含まれる各棘波、Ｐ−Ｑ部分等を特定部位とす
る。The electrocardiogram signal is composed of P wave, QRS wave and T wave as shown in FIG. Changes in the shape, amplitude, wave height, and the like of each spike wave are factors that indicate an abnormality of the heart. On the other hand, the PQ portion in FIG. 3 is a state in which the heart is functionally at rest, and is used as a reference value when measuring the amplitude of each spike wave or the ST level value. Hereinafter, each spike wave, PQ portion, etc. included in the electrocardiogram will be referred to as a specific portion.
これらの特定部位によって構成された心電図信号が生体
より検出される際、混入する雑音は一般にアーチファク
トと呼ばれ、幅広い周波数帯に及んでいる。このアーチ
ファクトで低周波数帯に属するものは特に基線ドリフト
と呼ばれている。When an electrocardiogram signal composed of these specific parts is detected by a living body, noise mixed therein is generally called an artifact and extends over a wide frequency band. This artifact belonging to the low frequency band is particularly called baseline drift.
心電図を計測する場合、この基線ドリフトの発生は心電
図に関する各種計測装置の誤認識を招く結果となってい
る。従来から基線ドリフトはフィルタを利用することに
よって除去できたが、完全に除去するためには、フィル
タ効果を強くせねばならず波形を歪めてしまう欠点があ
った。一方第４図（１）に示すような基線ドリフトの生
じた心電図に対して区分点を検出し、区分点間を直線補
間することで基線ドリフトを補正する方法も提案されて
いた。しかし、第４図（２）に示すように、一様でない
変化をする基線ドリフトに対しては完全な補正は困難で
あった。When measuring an electrocardiogram, the occurrence of this baseline drift results in erroneous recognition of various measuring devices regarding the electrocardiogram. Conventionally, the baseline drift can be removed by using a filter, but in order to completely remove it, there is a drawback that the filter effect must be strong and the waveform is distorted. On the other hand, there has also been proposed a method of correcting the baseline drift by detecting segment points on the electrocardiogram having a baseline drift as shown in FIG. 4 (1) and performing linear interpolation between the segment points. However, as shown in FIG. 4 (2), it is difficult to completely correct the baseline drift that changes unevenly.
上記に鑑み本発明は、基線ドリフトにおいて、特に補正
が困難な基線ドリフトを検出する心電図信号アーチファ
クト検出装置を提供することを目的とする。In view of the above, it is an object of the present invention to provide an electrocardiographic signal artifact detection device that detects a baseline drift that is particularly difficult to correct.
次に本発明の一実施例について図面を参照して本発明を
詳細に説明する。Next, one embodiment of the present invention will be described in detail with reference to the drawings.
第２図は第１図における各部波形図であり、（2a）は、
第１図で示す入力端（1a）に入力される信号波形を示
し、（2b）は、出力点（1b）に現れる信号波形を示し、
（2c）は、出力端（1c）に現れる信号波形を示す。FIG. 2 is a waveform chart of each part in FIG. 1, and (2a) is
The signal waveform input to the input terminal (1a) shown in FIG. 1 is shown, (2b) shows the signal waveform appearing at the output point (1b),
(2c) shows a signal waveform appearing at the output end (1c).
第１図に於いて、（11）は特定部位検出回路である。こ
の特定部位検出回路（11）は、入力端（1a）から入力さ
れた第２図（2a）で示す心電図信号上、“〇”印で示し
たＰ−Ｑ部位の電位差を検出する。In FIG. 1, (11) is a specific portion detecting circuit. The specific portion detection circuit (11) detects the potential difference of the PQ portion indicated by "O" on the electrocardiogram signal shown in Fig. 2 (2a) input from the input terminal (1a).
（12）は闘値電圧設定回路であり、闘値電圧を設定出力
する。この闘値電圧の値は、基線ドリフトによって生じ
る連続する２つの心拍上の２つのＰ−Ｑ部分の電位から
得られる電位差において、一様な変化をする基線ドリフ
トでは生じることがない電圧Ｅ（Ｖ）に設定されてい
る。(12) is a threshold voltage setting circuit, which sets and outputs the threshold voltage. The value of this threshold voltage is a voltage E (V) that does not occur in the baseline drift that changes uniformly in the potential difference obtained from the potentials of the two PQ portions on two consecutive heartbeats caused by the baseline drift. ) Is set.
（13）は比較回路である。比較回路（13）は前記闘値電
圧設定回路（12）の出力と前記特定部位検出回路（11）
の出力とを比較し、前記特定部位検出回路（11）が出力
したＰ−Ｑ部分の電位差が、前記闘値電圧設定回路（1
2）が出力した闘値電圧Ｅ（Ｖ）を越えた時、アーチフ
ァクトパルスを出力端（1c）に出力する。(13) is a comparison circuit. The comparison circuit (13) outputs the output of the threshold voltage setting circuit (12) and the specific portion detection circuit (11).
And the potential difference of the PQ portion output by the specific portion detection circuit (11) is compared with the output of the threshold voltage setting circuit (1
When the threshold voltage E (V) output by 2) is exceeded, an artifact pulse is output to the output end (1c).
次に上記構成による装置の作用を説明する。Next, the operation of the device configured as described above will be described.
特定部位検出回路（11）の入力点（1a）に入力された心
電図信号（第２図（2a））は、特定部位検出回路（11）
において、第２図（2a）の“〇印”によって示すＰ−Ｑ
部分の電位を検出し、一時的に記憶した後、次に到来し
た心電図よりＰ−Ｑ部分の電位を検出し、前記一時的に
記憶したＰ−Ｑ部分の電位との電位差をそれぞれH1、H
2、H3として検出し、その値の絶対値を出力点（1b）に
第２図（2b）で示ようにI1、I2、I3として出力する。The electrocardiogram signal (FIG. 2 (2a)) input to the input point (1a) of the specific part detection circuit (11) is the specific part detection circuit (11).
In Fig. 2, P-Q indicated by "○" in Fig. 2 (2a)
After the potential of the portion is detected and temporarily stored, the potential of the PQ portion is detected from the next electrocardiogram, and the potential difference from the temporarily stored potential of the PQ portion is respectively H1 and H.
2 and H3, and outputs the absolute value of the value as I1, I2, and I3 to the output point (1b) as shown in FIG. 2 (2b).
出力点（1b）での出力波形（2b）は、比較回路（13）に
入力され、闘値電圧設定回路（12）で設定出力された闘
値電圧Ｅ（Ｖ）と比較され、闘値電圧Ｅ（Ｖ）を越えた
時アーチファクトパルスとして第２図（2c）に示すよう
に単一パルスを発生する。尚、本発明に於いては、闘値
電圧Ｅ（Ｖ）は、各種診断装置の補正限度に応じて変更
可能であり適宜選択される。以上の通り本発明は、基線
ドリフトにおいて、補正が困難な、一様に生じない基線
ドリフトを検出し、異常心電図との誤認識を防ぐことが
できる。従って本発明を心電図自動解析装置や負荷心電
計等に取りつけることによって信頼性を向上させ、特に
長時間、心電図記録する際、多大なる効果を奏効するも
のである。The output waveform (2b) at the output point (1b) is input to the comparison circuit (13) and compared with the threshold voltage E (V) set and output by the threshold voltage setting circuit (12) to determine the threshold voltage. When E (V) is exceeded, a single pulse is generated as an artifact pulse as shown in FIG. 2 (2c). In the present invention, the threshold voltage E (V) can be changed according to the correction limit of various diagnostic devices and is appropriately selected. As described above, the present invention can detect a baseline drift that is difficult to correct and does not occur uniformly in the baseline drift, and can prevent erroneous recognition as an abnormal electrocardiogram. Therefore, by attaching the present invention to an electrocardiogram automatic analyzer, a stress electrocardiograph, etc., the reliability is improved, and a great effect is achieved particularly when recording an electrocardiogram for a long time.
第１図は本発明の一実施例の構成を示すブロック図、第
２図は第１図の動作作用波形図、第３図は正常心電図の
特定部位を示す波形図、第４図は心電図に基線ドリフト
を含んだ場合の波形図を示す。 Ｅ……闘値電圧（Ｖ） （11）……特定部位検出回路（Ｐ−Ｑ部位間の電位差検
出手段） （12）……闘値電圧設定回路（闘値設定手段） （13）……比較回路（比較手段）FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention, FIG. 2 is an operation action waveform diagram of FIG. 1, FIG. 3 is a waveform diagram showing a specific part of a normal electrocardiogram, and FIG. 4 is an electrocardiogram. The waveform diagram when a baseline drift is included is shown. E ... Threshold voltage (V) (11) ...... Specific part detection circuit (potential difference detection means between P and Q parts) (12) ...... Threshold voltage setting circuit (threshold value setting means) (13) ...... Comparison circuit (comparison means)
Claims (1)
し、連続する２つの心拍におけるＰ−Ｑ部位間の電位差
を検出するＰ−Ｑ部位間の電位差検出手段と、前記Ｐ−
Ｑ部位間の電位差と所定の闘値電圧とを比較する比較手
段とよりなることを特徴とする生体信号アーチファクト
検出装置。1. A potential difference detection means between P-Q sites for detecting a potential at a P-Q site from an electrocardiogram signal to detect a potential difference between P-Q sites in two consecutive heartbeats, and the P-
A biological signal artifact detection apparatus comprising: a comparison unit that compares a potential difference between Q parts and a predetermined threshold voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59227782A JPH0687842B2 (en) | 1984-10-31 | 1984-10-31 | Biological signal artifact detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59227782A JPH0687842B2 (en) | 1984-10-31 | 1984-10-31 | Biological signal artifact detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61106134A JPS61106134A (en) | 1986-05-24 |
| JPH0687842B2 true JPH0687842B2 (en) | 1994-11-09 |
Family
ID=16866292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59227782A Expired - Lifetime JPH0687842B2 (en) | 1984-10-31 | 1984-10-31 | Biological signal artifact detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0687842B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5640402Y2 (en) * | 1975-04-16 | 1981-09-21 | ||
| JPS59186544A (en) * | 1983-04-08 | 1984-10-23 | 株式会社アドバンス | Abnormal cardiograph discriminating apparatus |
-
1984
- 1984-10-31 JP JP59227782A patent/JPH0687842B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61106134A (en) | 1986-05-24 |
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