JP2757457B2 - Electrocardiogram R-wave detection circuit - Google Patents
Electrocardiogram R-wave detection circuitInfo
- Publication number
- JP2757457B2 JP2757457B2 JP1133193A JP13319389A JP2757457B2 JP 2757457 B2 JP2757457 B2 JP 2757457B2 JP 1133193 A JP1133193 A JP 1133193A JP 13319389 A JP13319389 A JP 13319389A JP 2757457 B2 JP2757457 B2 JP 2757457B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- electrocardiogram
- wave
- absolute value
- wave detection
- 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 title claims description 13
- 238000010586 diagram Methods 0.000 description 7
- 239000000284 extract Substances 0.000 description 1
- 230000035945 sensitivity Effects 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】 （産業上の利用分野） 本発明は心電図の波形処理におけるＲ波検出回路に関
し、特に高精度なＲ波検出回路に関する。Description: TECHNICAL FIELD The present invention relates to an R-wave detection circuit in electrocardiogram waveform processing, and more particularly to a highly accurate R-wave detection circuit.
（従来の技術） 従来、この種のＲ波検出回路は、特定の誘導部位（例
えばII誘導）を微分フィルタに通し、Ｒ波成分を抽出
し、検出域値を固定設定することによりＲ波を検出して
いた。(Prior Art) Conventionally, this type of R-wave detection circuit extracts an R-wave component by passing a specific lead portion (for example, lead II) through a differential filter, and sets a detection threshold value to fix the R-wave. Had been detected.
（発明が解決しようとする課題） 上述した従来のＲ波検出回路における検出レベル域値
は、固定値に設定されているため、一定レベルより低い
Ｒ波は全く検出されない。また、この設定域値の近傍に
あるＲ波はその時の条件により検出されたり、されなか
ったりでＲ波の検出が不正確になるという欠点がある。(Problems to be Solved by the Invention) Since the detection level threshold value in the above-described conventional R-wave detection circuit is set to a fixed value, no R-wave lower than a certain level is detected at all. Further, there is a disadvantage that the detection of the R wave in the vicinity of the set threshold value is inaccurate depending on the condition at that time or not.
（課題を解決するための手段） 本発明による心電図のＲ波検出回路は、心電図のＲ誘
導の中から選択された３誘導信号のそれぞれを入力と
し、微分絶対値の処理を行なう微分絶対値回路と、これ
ら微分絶対値回路の出力を重み付け加算する比例加算回
路と、この比例加算回路の出力のピーク値に応じて変化
する基準電圧を出力するピークホールド回路と、このピ
ークホールド回路で得られた前記基準電圧と前記比例加
算回路の出力とを比較することによってＲ波を検出する
コンパレータとを備える。(Means for Solving the Problems) An R-wave detecting circuit of an electrocardiogram according to the present invention receives a three-lead signal selected from among the R leads of an electrocardiogram as inputs and performs a differential absolute value circuit for processing a differential absolute value. And a proportional addition circuit that weights and adds the outputs of these differential absolute value circuits, a peak hold circuit that outputs a reference voltage that changes in accordance with the peak value of the output of the proportional addition circuit, and a peak hold circuit obtained by the peak hold circuit. A comparator for detecting an R wave by comparing the reference voltage with an output of the proportional addition circuit.
（実施例） 次に本発明について図面を参照しながら説明する。(Example) Next, the present invention will be described with reference to the drawings.
第１図は本発明による心電図のＲ波検出回路の一実施
例を示すブロック図である。また、第２図には第１図に
おける微分絶対値回路１〜３の回路例が、第３図には第
１図における長時間ピークホールド回路６の回路例が、
第４図には第１図の実施例を説明するための各部信号波
形図が示されている。FIG. 1 is a block diagram showing an embodiment of an electrocardiogram R-wave detection circuit according to the present invention. FIG. 2 shows a circuit example of the differential absolute value circuits 1 to 3 in FIG. 1, and FIG. 3 shows a circuit example of the long-time peak hold circuit 6 in FIG.
FIG. 4 is a signal waveform diagram of each part for explaining the embodiment of FIG.
さて、本実施例の動作を第４図をも参照しながら説明
すると、心電波形のうち選択された３つの心電波形（本
実施例ではII,V2,V5誘導波形）は、微分フィルタ特性を
有する絶対値回路である微分絶対値回路１〜３で各々処
理される。得られた心電波形II,V2,V5は比例加算回路４
において、例えば、Eg＝Ａ（EII＋0.8EV2＋0.9EV5）な
る重み付け加算された出力Egを得る。ここで、Ａは比例
定数である。この出力Egは、抵抗RDが並列接続され、可
変抵抗素子５として機能するFETのソースに供給され、
その抵抗が可変される。こうして変化した抵抗値と抵抗
Rgとの抵抗比で電源＋VCCが分圧され、分圧電圧ECが得
られる。第４図において、比例加算信号Egは所定時間間
隔で入力され、長時間ピークホールド回路６によりピー
ク値が保持され、出力ECとして得られる。得られた出力
ECは可変抵抗素子５としてのFETのゲートに印加され、
その抵抗値が可変されると、上記と同様に、抵抗Rgとの
抵抗比が変化し、結局、電圧ECが出力Egによってフィー
ドバック制御されることになる。得られた電圧ECはコン
パレータモノマルチ回路７における基準電圧として用い
られる。ここで、INSTはピークホールド回路６の動作を
リセットさせるための信号である。コンパレータモノマ
ルチ回路７では、上位基準電圧ECと比例加算回路の出力
Egとを比較して、Ｒ波信号の検出が為され、検出パルス
RDETとして得られる。コンパレータモノマルチ回路７に
おける基準電圧ECは現在の信号Egの一つ前に到来した信
号に基づいて得られた信号であり、この基準電圧はフィ
ードバック制御されて常に最適な状態でＲ波検出を行な
うことになる。Now, the operation of the present embodiment will be described with reference to FIG. 4 as well. The three ECG waveforms selected from the ECG waveforms (II, V 2 and V 5 lead waveforms in the present embodiment) are differentiated. The signals are processed by differential absolute value circuits 1 to 3, which are absolute value circuits having filter characteristics. The obtained electrocardiographic waveforms II, V 2 , V 5 are added to the proportional addition circuit 4
In, for example, obtain the E g = A (E II + 0.8E V2 + 0.9E V5) comprising weighted summed output E g. Here, A is a proportionality constant. This output E g is supplied to the source of an FET that functions as a variable resistance element 5 with a resistance R D connected in parallel,
The resistance is varied. Resistance value and resistance changed in this way
The power supply + V CC is divided by the resistance ratio with R g, and a divided voltage E C is obtained. In Figure 4, the proportional sum signal E g is input at predetermined time intervals, the peak value is held by the peak hold circuit 6 long, obtained as an output E C. The resulting output
E C is applied to the gate of the FET as the variable resistance element 5,
When the resistance value is varied, in the same manner as described above, the resistance R g resistance ratio is changed with, eventually, the voltage E C is to be feedback-controlled by the output E g. The resulting voltage E C is used as the reference voltage in the comparator monostable multivibrator circuit 7. Here, INST is a signal for resetting the operation of the peak hold circuit 6. In the comparator mono-multi circuit 7, the upper reference voltage E C and the output of the proportional addition circuit
The R wave signal is detected by comparing with E g and the detection pulse
Obtained as RDET. The reference voltage E C in the comparator mono-multiplier circuit 7 is a signal obtained based on a signal that arrives immediately before the current signal E g , and this reference voltage is feedback-controlled and always detects an R wave in an optimal state. Will be performed.
第２図には、第１図における微分絶対値回路1,2,3の
一例が、また第３図には長時間ピークホールド回路６の
一例がそれぞれ示されている。図中、IC1,IC2,IC3は演
算増幅器を、Q1とQ2はトランジスタを示す。FIG. 2 shows an example of the differential absolute value circuits 1, 2, and 3 in FIG. 1, and FIG. 3 shows an example of the long-time peak hold circuit 6. In the figure, IC1, IC2, IC3 to the operational amplifier, Q 1, Q 2 denotes a transistor.
（発明の効果） 以上説明したように本発明は、選択された３誘導波形
の微分絶対値を所定の重み付け加算し、加算信号のピー
ク値により可変抵抗素子のイオン抵抗をコントロールし
て基準電圧（域値）を最適決定しているので低いレベル
のＲ波でも、上記ピーク値に比例した検出感度となるよ
う基準電圧を自動設定できる。したがって、高精度なＲ
波検出が可能となるという効果がある。(Effects of the Invention) As described above, according to the present invention, the differential absolute values of the selected three-lead waveforms are weighted and added, and the ionic resistance of the variable resistance element is controlled based on the peak value of the added signal. Since the threshold value is optimally determined, the reference voltage can be automatically set so that the detection sensitivity is proportional to the peak value even with a low-level R wave. Therefore, high precision R
There is an effect that wave detection becomes possible.
第１図は本発明による心電図のＲ波検出回路の一実施例
を示すブロック図、第２図は第１図の微分絶対値回路の
一例を示す図、第３図は第１図の長時間ピークホールド
回路６の一例を示す図、第４図は第１図のブロック図の
主要部の信号波形を示す図である。 1,2,3……微分絶対値回路、４……比例加算回路、５…
…可変抵抗素子、６……長時間ピークホールド回路、７
……コンパレータ・モノマルチ回路。FIG. 1 is a block diagram showing an embodiment of an electrocardiogram R-wave detecting circuit according to the present invention, FIG. 2 is a diagram showing an example of a differential absolute value circuit of FIG. 1, and FIG. FIG. 4 is a diagram showing an example of the peak hold circuit 6, and FIG. 4 is a diagram showing signal waveforms of main parts of the block diagram of FIG. 1,2,3 ... Differential absolute value circuit, 4 ... Proportional addition circuit, 5
... variable resistance element, 6 ... long-time peak hold circuit, 7
...... Comparator / mono-multi circuit.
Claims (1)
信号のそれぞれを入力とし、微分絶対値の処理を行なう
微分絶対値回路と、これら微分絶対値回路の出力を重み
付け加算する比例加算回路と、この比例加算回路の出力
のピーク値に応じて変化する基準電圧を出力するピーク
ホールド回路と、このピークホールド回路で得られた前
記基準電圧と前記比例加算回路の出力とを比較すること
によってＲ波を検出するコンパレータとを備えて成るこ
とを特徴とする心電図のＲ波検出回路。1. A differential absolute value circuit for receiving each of three lead signals selected from the R lead of an electrocardiogram and processing a differential absolute value, and a proportional addition for weighting and adding the outputs of these differential absolute value circuits Circuit, a peak hold circuit that outputs a reference voltage that changes according to the peak value of the output of the proportional addition circuit, and comparing the reference voltage obtained by the peak hold circuit with the output of the proportional addition circuit. An R-wave detection circuit for an electrocardiogram, comprising: a comparator for detecting an R-wave by using the comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1133193A JP2757457B2 (en) | 1989-05-26 | 1989-05-26 | Electrocardiogram R-wave detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1133193A JP2757457B2 (en) | 1989-05-26 | 1989-05-26 | Electrocardiogram R-wave detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0344A JPH0344A (en) | 1991-01-07 |
| JP2757457B2 true JP2757457B2 (en) | 1998-05-25 |
Family
ID=15098886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1133193A Expired - Lifetime JP2757457B2 (en) | 1989-05-26 | 1989-05-26 | Electrocardiogram R-wave detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2757457B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015163369A1 (en) | 2014-04-25 | 2015-10-29 | 株式会社東芝 | Electrocardiographic waveform detection device and imaging device |
-
1989
- 1989-05-26 JP JP1133193A patent/JP2757457B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0344A (en) | 1991-01-07 |
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