JP2003144404A - Electrocardiographic signal processor - Google Patents
Electrocardiographic signal processorInfo
- Publication number
- JP2003144404A JP2003144404A JP2001348693A JP2001348693A JP2003144404A JP 2003144404 A JP2003144404 A JP 2003144404A JP 2001348693 A JP2001348693 A JP 2001348693A JP 2001348693 A JP2001348693 A JP 2001348693A JP 2003144404 A JP2003144404 A JP 2003144404A
- Authority
- JP
- Japan
- Prior art keywords
- electrocardiographic signal
- heart rate
- circuit
- electrocardiographic
- negative feedback
- 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.)
- Granted
Links
- 238000012545 processing Methods 0.000 claims abstract description 31
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 18
- 230000010355 oscillation Effects 0.000 abstract description 5
- 238000003287 bathing Methods 0.000 abstract 3
- 230000003321 amplification Effects 0.000 description 8
- 238000003199 nucleic acid amplification method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 235000001537 Ribes X gardonianum Nutrition 0.000 description 1
- 235000001535 Ribes X utile Nutrition 0.000 description 1
- 235000016919 Ribes petraeum Nutrition 0.000 description 1
- 244000281247 Ribes rubrum Species 0.000 description 1
- 235000002355 Ribes spicatum Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Landscapes
- Bathtub Accessories (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
- Devices For Medical Bathing And Washing (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、浴槽内に設置さ
れた電極によって検知された入浴者の心電信号に基づい
て、入浴者の心拍数を算出する心拍数算出処理等の所定
の信号処理を行う心電信号処理装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a predetermined signal processing such as a heart rate calculation processing for calculating a bather's heart rate based on a bather's electrocardiographic signal detected by electrodes installed in a bathtub. The present invention relates to an electrocardiographic signal processing device.
【０００２】[0002]
【従来の技術】入浴時に心拍を測定する浴槽において
は、心臓に負担をかけずに入浴を行うことができるよう
に、従来から、浴槽に浸かっている入浴者の心拍数等の
心拍情報を報知する心拍情報報知システムが開発されて
おり、この種の心拍情報報知システムとしては、例え
ば、図４に示すようなものがある。2. Description of the Related Art In a bathtub for measuring a heartbeat when taking a bath, the heartbeat information such as the heart rate of a bather immersed in the bathtub has been conventionally notified so that the bath can be taken without burdening the heart. A heartbeat information notifying system has been developed. As such a heartbeat information notifying system, there is one shown in FIG. 4, for example.
【０００３】この心拍情報報知システム５０は、同図に
示すように、浴槽に浸かっている入浴者が発する心電信
号を、浴槽内のお湯を介して検出する電極５１ａ、５１
ｂ、５１ｃと、この電極５１ａ、５１ｂ間の電位差（心
電信号）に基づいて、単位時間当りの心拍数を算出する
心拍数算出処理を行う心電信号処理装置５２と、この心
電信号処理装置５２によって算出された単位時間当りの
心拍数を表示する表示装置５８とから構成されており、
心電信号処理装置５２は、電極５１ａ、５１ｂ間の電位
差（心電信号）を増幅する差動増幅回路５３と、この差
動増幅回路５３によって増幅された心電信号からノイズ
成分を除去するフィルタ回路５４と、このフィルタ回路
５４によってノイズ成分が除去された心電信号を増幅す
る増幅回路５５と、この増幅回路５５によって増幅され
た心電信号の波形を整形する波形整形回路５６と、この
波形整形回路５６によって波形整形された心電信号に基
づいて、単位時間当りの心拍数を算出する演算回路５７
とを備えている。As shown in FIG. 1, this heartbeat information notifying system 50 detects electrodes 51a, 51 for detecting an electrocardiographic signal generated by a bather immersed in a bathtub through the hot water in the bathtub.
b and 51c, and an electrocardiographic signal processing device 52 that performs a heart rate calculation process for calculating the heart rate per unit time based on the potential difference (electrocardiographic signal) between the electrodes 51a and 51b, and the electrocardiographic signal processing. And a display device 58 for displaying the heart rate per unit time calculated by the device 52,
The electrocardiographic signal processing device 52 includes a differential amplifier circuit 53 that amplifies a potential difference (electrocardiographic signal) between the electrodes 51a and 51b, and a filter that removes noise components from the electrocardiographic signal amplified by the differential amplifier circuit 53. A circuit 54, an amplification circuit 55 that amplifies the electrocardiographic signal from which noise components have been removed by the filter circuit 54, a waveform shaping circuit 56 that shapes the waveform of the electrocardiographic signal amplified by the amplification circuit 55, and this waveform. An arithmetic circuit 57 for calculating the heart rate per unit time based on the electrocardiographic signal whose waveform has been shaped by the shaping circuit 56.
It has and.
【０００４】[0004]
【発明が解決しようとする課題】ところで、上述したよ
うに、浴槽に固定設置されている電極５１ａ、５１ｂ、
５１ｃによって、浴槽に浸かっている入浴者が発する心
電信号を浴槽内のお湯を介して間接的に検出する場合、
浴槽内で入浴者が動いたり、入浴者が動くことによって
浴槽内のお湯が波打ったりすると、図５（ａ）に示すよ
うに、検出された心電信号の基線（基準レベル）ＢＬが
変動する、所謂、基線動揺が発生する。By the way, as described above, the electrodes 51a, 51b fixedly installed in the bathtub,
When the electrocardiographic signal emitted by the bather immersed in the bathtub is indirectly detected via the hot water in the bathtub by 51c,
When the bather moves in the bathtub or the hot water in the bathtub undulates as the bather moves, the baseline (reference level) BL of the detected electrocardiographic signal fluctuates, as shown in FIG. 5 (a). A so-called baseline sway occurs.
【０００５】このように、浴槽に浸かっている入浴者の
動きによって、心電信号に大きな基線動揺が発生する
と、増幅率の大きい増幅回路５５から出力される増幅後
の心電信号の基線自体が検出レベルを超えてしまい、そ
の後に演算回路５７で行わなければならない心拍数の算
出処理等を実質的に実行することができなくなるといっ
た問題がある。As described above, when a large sway of the electrocardiographic signal occurs in the electrocardiographic signal due to the movement of the bather immersed in the bathtub, the base line itself of the amplified electrocardiographic signal output from the amplification circuit 55 having a large amplification factor is There is a problem that the detection level is exceeded, and it becomes impossible to substantially execute the heart rate calculation processing and the like that must be performed by the arithmetic circuit 57 after that.
【０００６】そこで、この発明の課題は、検出された心
電信号に基線動揺が発生している場合であっても、心拍
数算出処理等の所定の処理を確実に行うことができる心
電信号処理装置を提供することにある。Therefore, an object of the present invention is to reliably perform a predetermined process such as a heart rate calculation process even when the detected electrocardiographic signal has a base line sway. It is to provide a processing device.
【０００７】[0007]
【課題を解決するための手段及びその効果】上記の課題
を解決するため、請求項１にかかる発明は、浴槽内に設
置された電極によって検知された入浴者の心電信号に基
づいて、所定の信号処理を行う心電信号処理装置におい
て、前記電極によって検出された心電信号の基準レベル
を、所定のレベルに維持する基準レベル安定化手段を備
えていることを特徴とする心電信号処理装置を提供する
ものである。Means for Solving the Problems and Effects Thereof In order to solve the above problems, the invention according to claim 1 is based on an electrocardiographic signal of a bather detected by electrodes installed in a bathtub. The electrocardiographic signal processing device for performing signal processing according to claim 1, further comprising reference level stabilizing means for maintaining the reference level of the electrocardiographic signal detected by the electrode at a predetermined level. A device is provided.
【０００８】以上のように、この心電信号処理装置は、
電極によって検出された心電信号の基準レベルを、所定
のレベルに維持する基準レベル安定化手段を備えている
ので、基線動揺が発生している場合でも、基準レベル安
定化手段によって、その基線動揺がキャンセルされ、所
定の信号処理を確実に実行することができる。As described above, this electrocardiographic signal processing device is
Since the reference level stabilizing means for maintaining the reference level of the electrocardiographic signal detected by the electrode at a predetermined level is provided, even if the baseline oscillation occurs, the reference level stabilizing means causes the baseline oscillation to occur. Is canceled, and the predetermined signal processing can be surely executed.
【０００９】こういった心電信号処理装置は、通常、電
極間の電位差（心電信号）を差動増幅する差動増幅回路
を備えているので、請求項２にかかる発明の心電信号処
理装置のように、前記基準レベル安定化手段を、前記差
動増幅回路の出力から、心電信号よりも低い周波数成分
を符号を反転した状態で入力側に負帰還をかける負帰還
回路によって構成することにより、基線動揺をキャンセ
ルすることができる。Since such an electrocardiographic signal processing device usually comprises a differential amplifier circuit for differentially amplifying the potential difference (electrocardiographic signal) between the electrodes, the electrocardiographic signal processing of the invention according to claim 2 Like the device, the reference level stabilizing means is configured by a negative feedback circuit that applies negative feedback to the input side from the output of the differential amplifier circuit in the state where the sign of the frequency component lower than the electrocardiographic signal is inverted. As a result, the sway of the baseline can be canceled.
【００１０】前記負帰還回路としては、請求項３にかか
る発明の心電信号処理装置のように、前記差動増幅回路
の出力から、負積分回路を介して入力側に負帰還をかけ
るような構成を採用すればよい。As the negative feedback circuit, as in the electrocardiographic signal processing device according to the third aspect of the present invention, a negative feedback is applied from the output of the differential amplifier circuit to the input side via the negative integrator circuit. The configuration may be adopted.
【００１１】[0011]
【発明の実施の形態】以下、実施の形態について図面を
参照して説明する。図１は、本発明の心電信号処理装置
を使用した心拍情報報知システムを示している。同図に
示すように、この心拍情報報知システム１は、浴室Ｒ内
に設置された浴槽Ｂに対する自動注湯機能や追焚機能の
他、シャワーやカラン等への給湯機能を備えた風呂給湯
器１０と、この風呂給湯器１０を操作するための操作手
段として、浴室Ｒ及び台所に設置される浴室用操作リモ
コン２０ａ及び台所用操作リモコン２０ｂと、浴槽Ｂに
浸かっている入浴者の心電信号を検出するために浴槽Ｂ
内に設置される心拍検出電極３１、３２、３３と、これ
らの心拍検出電極３１、３２、３３がそれぞれ接続さ
れ、心拍検出電極３１、３２、３３によって検出された
心電信号に基づいて、１分間当りの心拍数に数値化され
た心拍データを作成する、本発明にかかる心電信号処理
装置である心拍数演算ユニット４０とを備えており、こ
の心拍数演算ユニット４０には、前記風呂給湯器１０か
ら電源の供給が行われるようになっている。なお、図１
では、通信系統を破線で、電源系統を実線で表示してあ
る。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments will be described below with reference to the drawings. FIG. 1 shows a heartbeat information notifying system using the electrocardiographic signal processing device of the present invention. As shown in the figure, the heartbeat information notifying system 1 is a bath water heater having an automatic hot water pouring function and a reheating function for a bathtub B installed in a bathroom R, as well as a hot water supply function for a shower or a currant. 10, a bathroom operation remote controller 20a and a kitchen operation remote controller 20b installed in the bathroom R and the kitchen as operation means for operating the bath water heater 10, and an electrocardiographic signal of a bather immersed in the bathtub B. Bathtub B to detect
Based on the electrocardiographic signals detected by the heartbeat detecting electrodes 31, 32, 33, the heartbeat detecting electrodes 31, 32, 33 installed inside are connected to the heartbeat detecting electrodes 31, 32, 33, respectively. The heart rate calculation unit 40, which is an electrocardiographic signal processing device according to the present invention, for creating heart rate data that has been digitized into heart rate per minute, and the heart rate calculation unit 40 is provided with the bath hot water. Power is supplied from the container 10. Note that FIG.
Then, the communication system is shown by a broken line, and the power supply system is shown by a solid line.
【００１２】前記風呂給湯器１０、前記浴室用操作リモ
コン２０ａ及び台所用操作リモコン２０ｂには、通信手
段であるシリアルインターフェースを介して相互に通信
可能なコントローラ１１、２１ａ、２１ｂがそれぞれ搭
載されており、これらのコントローラ１１、２１ａ、２
１ｂが相互に連携をとりながら、風呂給湯器１０の運転
動作を統括的に制御している。The bath water heater 10, the bathroom operation remote controller 20a and the kitchen operation remote controller 20b are respectively equipped with controllers 11, 21a and 21b which can communicate with each other via a serial interface which is a communication means. , These controllers 11, 21a, 2
1b integrally controls the operation of the bath water heater 10 while cooperating with each other.
【００１３】また、浴室用操作リモコン２０ａ及び台所
用操作リモコン２０ｂは、風呂設定温度、給湯設定温度
等の風呂給湯器関連情報や入浴者の心拍数等の心拍関連
情報等を表示する表示部２２ａ、２２ｂをそれぞれ備え
ており、これらの表示部２２ａ、２２ｂには、風呂給湯
器関連情報または心拍関連情報のいずれを表示させるの
かを切り替える（選択する）ための報知モード切替（選
択）用のメニュースイッチ（図示せず）が表示されるよ
うになっている。The bathroom operation remote controller 20a and the kitchen operation remote controller 20b are provided with a display unit 22a for displaying bath water heater related information such as bath set temperature and hot water supply set temperature, and heartbeat related information such as the bather's heart rate. , 22b respectively, and a menu for switching the notification mode (selection) for switching (selecting) whether to display the bath water heater related information or the heartbeat related information on these display units 22a and 22b. A switch (not shown) is displayed.
【００１４】一対の心拍検出電極３１、３２は、浴槽Ｂ
に浸かった入浴者の心臓を挟むように、浴槽Ｂにおける
一端側の左右両側壁に、残りの心拍検出電極（中性点）
３３は、浴槽Ｂに浸かった入浴者の足元側（他端側）に
おける浴槽Ｂの側壁にそれぞれ設置されており、各心拍
検出電極３１、３２、３３は、浴槽Ｂに貯留されたお湯
を介して入浴者の心電信号が検出されるように、所定の
高さ位置に設置されている。The pair of heartbeat detecting electrodes 31 and 32 are provided in the bathtub B.
The remaining heartbeat detecting electrodes (neutral point) are placed on the left and right side walls on one end side of the bath B so as to sandwich the bather's heart immersed in the bath.
33 are respectively installed on the side walls of the bathtub B on the foot side (the other end side) of the bather who is immersed in the bathtub B, and the heartbeat detecting electrodes 31, 32, and 33 pass through the hot water stored in the bathtub B. It is installed at a predetermined height so that the electrocardiographic signal of the bather can be detected.
【００１５】前記心拍数演算ユニット４０は、通信手段
であるシリアルインターフェースを介して、浴室用操作
リモコン２０ａや台所用操作リモコン２０ｂに通信可能
に接続されており、この心拍数演算ユニット４０によっ
て作成された心拍データ（１分間当りの心拍数）が、所
定の時間間隔（例えば、２秒間隔）で浴室用操作リモコ
ン２０ａや台所用操作リモコン２０ｂのコントローラ２
１ａ、２１ｂに送信されるようになっている。The heart rate calculation unit 40 is communicably connected to the bathroom operation remote controller 20a and the kitchen operation remote controller 20b via a serial interface which is a communication means, and is created by the heart rate calculation unit 40. Heart rate data (heart rate per minute) is a controller 2 of the bathroom operation remote controller 20a or the kitchen operation remote controller 20b at a predetermined time interval (for example, an interval of 2 seconds).
It is transmitted to 1a and 21b.
【００１６】この心拍数演算ユニット４０は、図２に示
すように、心拍検出電極３１、３２、３３がそれぞれ接
続され、心拍検出電極３１、３２、３３によって検出さ
れた心電信号から周波数の高いインパルスノイズを除去
する第１フィルタ回路４１と、この第１フィルタ回路４
１によってノイズが除去された心電信号を増幅する差動
増幅回路４２と、この差動増幅回路４２によって増幅さ
れた心電信号から電源周波数以上のノイズを除去する第
２フィルタ回路４３と、この第２フィルタ回路４３によ
ってノイズが除去された心電信号を再度増幅する増幅回
路４４と、この増幅回路４４によって増幅された心電信
号に基づいて、１分間当りの心拍数に数値化された心拍
データを作成し、この心拍データをシリアルインターフ
ェース（Ｉ／Ｆ）４６を介して浴室用操作リモコン２０
ａや台所用操作リモコン２０ｂのコントローラ２１ａ、
２１ｂに送信するマイクロコンピュータ４５とを備えて
おり、前記差動増幅回路４２には、入力される心電信号
に発生した基線動揺をキャンセルする基準レベル安定化
回路４７が接続されている。As shown in FIG. 2, the heart rate calculating unit 40 is connected with heart rate detecting electrodes 31, 32 and 33, respectively, and has a high frequency from an electrocardiographic signal detected by the heart rate detecting electrodes 31, 32 and 33. A first filter circuit 41 for removing impulse noise, and the first filter circuit 4
A differential amplifier circuit 42 for amplifying the electrocardiographic signal from which noise has been removed by 1; a second filter circuit 43 for removing noise above the power supply frequency from the electrocardiographic signal amplified by this differential amplifier circuit 42; An amplification circuit 44 that amplifies the electrocardiographic signal from which noise has been removed by the second filter circuit 43 again, and a heartbeat that has been digitized into a heart rate per minute based on the electrocardiographic signal amplified by this amplification circuit 44. Data is created, and this heartbeat data is sent to the bathroom operation remote controller 20 via the serial interface (I / F) 46.
a and the controller 21a of the kitchen remote controller 20b,
21b, and the differential amplifier circuit 42 is connected with a reference level stabilizing circuit 47 for canceling the baseline fluctuation generated in the input electrocardiographic signal.
【００１７】前記差動増幅回路４２は、図３に示すよう
に、前段に設けられた２つの演算増幅器４２１、４２２
と、後段に設けられた１つの演算増幅器４２３とを備え
ており、後段の演算増幅器４２３に、上述した基準レベ
ル安定化回路４７が接続されている。As shown in FIG. 3, the differential amplifier circuit 42 includes two operational amplifiers 421 and 422 provided in the preceding stage.
And one operational amplifier 423 provided in the subsequent stage, and the above-mentioned reference level stabilizing circuit 47 is connected to the operational amplifier 423 in the subsequent stage.
【００１８】前段の２つの演算増幅器４２１、４２２
は、それぞれの非反転入力端子（＋）に、心拍検出電極
３１、３２からの検出信号が第１フィルタ回路４１を介
して入力されると共に、それぞれの演算増幅器４２１、
４２２の出力が、抵抗４２４、４２５を介して他方の演
算増幅器４２２、４２１の反転入力端子（−）に入力さ
れるようになっており、それぞれの演算増幅器４２１、
４２２の出力から負帰還抵抗４２６、４２７を介してそ
れぞれの反転入力端子（−）に負帰還がかけられてい
る。従って、心拍検出電極３１、３２によって検出され
た心電信号は、信号基準レベル（２．５Ｖ）に対するオ
フセットがキャンセルされた状態で、２つの演算増幅器
４２１、４２２から出力される。Two operational amplifiers 421 and 422 in the preceding stage
The detection signals from the heartbeat detection electrodes 31 and 32 are input to the respective non-inverting input terminals (+) via the first filter circuit 41, and the operational amplifiers 421 and
The output of 422 is input to the inverting input terminals (−) of the other operational amplifiers 422 and 421 via the resistors 424 and 425.
Negative feedback is applied to the respective inverting input terminals (-) from the output of 422 via the negative feedback resistors 426 and 427. Therefore, the electrocardiographic signals detected by the heartbeat detecting electrodes 31 and 32 are output from the two operational amplifiers 421 and 422 in a state where the offset with respect to the signal reference level (2.5V) is canceled.
【００１９】また、後段の演算増幅器４２３には、その
非反転入力端子（＋）、反転入力端子（−）に、前段の
演算増幅器４２１、４２２の出力がそれぞれ入力される
ようになっており、この演算増幅器４２３の出力から負
帰還抵抗４２８を介して反転入力端子（−）に負帰還が
かけられている。The outputs of the operational amplifiers 421 and 422 of the preceding stage are input to the non-inverting input terminal (+) and the inverting input terminal (-) of the operational amplifier 423 of the latter stage, respectively. Negative feedback is applied from the output of the operational amplifier 423 to the inverting input terminal (-) via the negative feedback resistor 428.
【００２０】従って、第１フィルタ回路４１を介して出
力される心拍検出電極３１、３２間の電位差（心電信
号）が、この差動増幅回路４２によって増幅され、第２
フィルタ回路４３に出力される。Therefore, the potential difference (electrocardiographic signal) between the heartbeat detecting electrodes 31 and 32 output via the first filter circuit 41 is amplified by the differential amplifying circuit 42 and the second
It is output to the filter circuit 43.
【００２１】前記基準レベル安定化回路４７は、図３に
示すように、差動増幅回路４２を構成している演算増幅
器４２３の出力から、負積分回路４７１を介して演算増
幅器４２３の非反転入力端子（＋）に負帰還をかける負
帰還回路によって構成されており、負積分回路４７１
は、入力信号に対して周波数の高い心電信号を減衰させ
るような特性を有している。なお、この負帰還回路に
は、差動増幅回路４２から第２フィルタ回路４３に出力
される心電信号の減衰を防止するために電圧緩衝回路４
７７が設けられている。The reference level stabilization circuit 47, as shown in FIG. 3, receives the non-inverting input of the operational amplifier 423 from the output of the operational amplifier 423 which constitutes the differential amplifier circuit 42 via the negative integration circuit 471. It is configured by a negative feedback circuit that applies negative feedback to the terminal (+).
Has a characteristic of attenuating an electrocardiographic signal having a high frequency with respect to an input signal. The negative feedback circuit includes a voltage buffer circuit 4 in order to prevent attenuation of an electrocardiographic signal output from the differential amplifier circuit 42 to the second filter circuit 43.
77 is provided.
【００２２】前記負積分回路４７１は、演算増幅器４２
３からの出力信号が、電圧緩衝回路４７７を介して、反
転入力端子（−）に入力される演算増幅器４７２を備え
ており、この演算増幅器４７２の非反転入力端子（＋）
は、抵抗４７３を介してシグナルグランド（２．５Ｖ）
に接続されていると共に、演算増幅器４７２の出力がコ
ンデンサ４７４、４７５、抵抗４７６を介して反転入力
端子（−）に負帰還されている。The negative integrator circuit 471 includes an operational amplifier 42.
The output signal from the output signal No. 3 is provided with an operational amplifier 472 that is input to the inverting input terminal (-) via the voltage buffer circuit 477, and the non-inverting input terminal (+) of this operational amplifier 472 is provided.
Is the signal ground (2.5V) via the resistor 473.
The output of the operational amplifier 472 is negatively fed back to the inverting input terminal (−) via the capacitors 474 and 475 and the resistor 476.
【００２３】この負積分回路４７１は、心電信号以上の
周波数が高い入力を減衰させるように構成されているの
で、差動増幅回路４２の演算増幅器４２３から出力され
る信号のうち、心電信号より低い周波数成分のみが符号
反転された状態で演算増幅器４２３の非反転入力端子
（＋）に帰還されることになる。従って、図５（ａ）に
示すように、差動増幅回路４２の入力に基線動揺が発生
している場合であっても、心電信号より低い周波数成分
である基線動揺がキャンセルされ、同図（ｂ）に示すよ
うに、心電信号の基準レベルが所定のレベル（２．５
Ｖ）に保持された状態で、第２フィルタ回路４３に出力
されるようになっている。Since the negative integrator circuit 471 is configured to attenuate an input having a frequency higher than the electrocardiographic signal, the electrocardiographic signal of the signals output from the operational amplifier 423 of the differential amplifier circuit 42 is used. Only the lower frequency component will be fed back to the non-inverting input terminal (+) of the operational amplifier 423 in the state where its sign is inverted. Therefore, as shown in FIG. 5A, even when the base line sway is generated at the input of the differential amplifier circuit 42, the base line sway, which is a frequency component lower than the electrocardiographic signal, is canceled, As shown in (b), the reference level of the electrocardiographic signal is a predetermined level (2.5
V), and is output to the second filter circuit 43.
【００２４】以上のように構成された心拍情報報知シス
テム１では、浴室用操作リモコン２０ａまたは台所用操
作リモコン２０ｂの運転スイッチをＯＮすると、浴室用
操作リモコン２０ａ及び台所用操作リモコン２０ｂの表
示部２２ａ、２２ｂに、風呂設定温度や給湯設定温度等
の風呂給湯器関連情報が自動的に表示されるが、浴槽Ｂ
に浸かった入浴者または入浴者以外の家族の人が、浴室
用操作リモコン２０ａまたは台所用操作リモコン２０ｂ
を操作することによって、報知モード切替（選択）用の
メニュースイッチを表示させ、このメニュースイッチに
よって心拍関連情報の報知モードに切り替えると、浴室
用操作リモコン２０ａ及び台所用操作リモコン２０ｂの
表示部２２ａ、２２ｂに入浴者の心拍数が表示される。In the heartbeat information notifying system 1 configured as described above, when the operation switch of the bathroom remote controller 20a or the kitchen remote controller 20b is turned on, the display portions 22a of the bathroom remote controller 20a and the kitchen remote controller 20b are displayed. , 22b will automatically display bath water heater related information such as bath set temperature and hot water set temperature.
A bather who is immersed in the bath or a family member other than the bather operates the bathroom operation remote controller 20a or the kitchen operation remote controller 20b.
When a menu switch for switching the notification mode (selection) is displayed by operating, and the mode is switched to the notification mode of the heartbeat-related information by this menu switch, the display unit 22a of the bathroom operation remote controller 20a and the kitchen operation remote controller 20b, The heart rate of the bather is displayed at 22b.
【００２５】以上のように、この心拍情報報知システム
１に使用されている心拍数演算ユニット４０は、心拍検
出電極３１、３２間の電圧を増幅する差動増幅回路４２
の出力から、心電信号よりも低い周波数成分を符号を反
転した状態で出力する負積分回路４７１を介して入力側
に負帰還をかける負帰還回路によって構成された基準レ
ベル安定化回路４７を備えているので、浴槽Ｂに浸かっ
た入浴者の動きに伴って心電信号に発生する基線動揺が
確実にキャンセルされ、増幅率の大きい後段の増幅回路
４４から出力される心電信号が検出レベルを越えること
がなく、その心電信号に基づいて、マイクロコンピュー
タ４５が入浴者の心拍数を確実に求めることができる。As described above, the heart rate calculation unit 40 used in the heartbeat information notifying system 1 includes the differential amplifier circuit 42 for amplifying the voltage between the heartbeat detecting electrodes 31 and 32.
A negative feedback circuit that applies negative feedback to the input side through a negative integrator circuit 471 that outputs a frequency component lower than the electrocardiographic signal in a state where the sign is inverted. Therefore, the baseline sway generated in the electrocardiographic signal due to the movement of the bather immersed in the bathtub B is reliably canceled, and the electrocardiographic signal output from the amplification circuit 44 in the subsequent stage having a large amplification factor is at the detection level. Without exceeding, the microcomputer 45 can reliably obtain the bather's heart rate based on the electrocardiographic signal.
【００２６】なお、上述した実施形態では、本発明にか
かる心電信号処理装置の一例である心拍数演算ユニット
４０を使用した心拍情報報知システム１について説明し
たが、これに限定されるものではなく、本発明の心電信
号処理装置は、浴槽内に設置された電極によって間接的
に検知された入浴者の心電信号に基づいて、種々の信号
処理を行う場合に適用することができることはいうまで
もない。In the above-described embodiment, the heartbeat information notifying system 1 using the heartbeat rate calculating unit 40, which is an example of the electrocardiographic signal processing device according to the present invention, has been described, but the present invention is not limited to this. It can be said that the electrocardiographic signal processing device of the present invention can be applied to the case of performing various signal processings based on the electrocardiographic signal of the bather indirectly detected by the electrodes installed in the bathtub. There is no end.
【図１】この発明にかかる心電信号処理装置の一実施形
態である心拍数演算ユニットが使用されている心拍情報
報知システムを示す概略構成図である。FIG. 1 is a schematic configuration diagram showing a heartbeat information notifying system using a heartbeat rate calculation unit which is an embodiment of an electrocardiographic signal processing device according to the present invention.
【図２】同上の心拍数演算ユニットを示すブロック図で
ある。FIG. 2 is a block diagram showing a heart rate calculation unit of the above.
【図３】同上の心拍数演算ユニットを構成している差動
増幅回路及び基準レベル安定化回路の詳細を示す回路図
である。FIG. 3 is a circuit diagram showing details of a differential amplifier circuit and a reference level stabilizing circuit which constitute the heart rate calculation unit of the above.
【図４】従来の心電信号処理装置を示すブロック図であ
る。FIG. 4 is a block diagram showing a conventional electrocardiographic signal processing device.
【図５】（ａ）は基線動揺が発生している状態の心電波
形を示す図、（ｂ）は基線動揺がキャンセルされた状態
の心電波形を示す図である。FIG. 5A is a diagram showing an electrocardiographic waveform in a state where the baseline oscillation is generated, and FIG. 5B is a diagram showing an electrocardiographic waveform in a state in which the baseline oscillation is canceled.
１ 心拍情報報知システム １０ 風呂給湯器 ２０ａ 浴室用操作リモコン ２０ｂ 台所用操作リモコン ３１、３２、３３ 心拍検出電極（電極） ４０ 心拍数演算ユニット（心電信号処理装置） ４１ 第１フィルタ回路 ４２ 差動増幅回路 ４３ 第２フィルタ回路 ４４ 増幅回路 ４５ マイクロコンピュータ ４６ シリアルインターフェース ４７ 基準レベル安定化回路（基準レベル安定化手段） ４７１ 負積分回路 ４７２ 演算増幅器 ４７３、４７６ 抵抗 ４７４、４７５ コンデンサ ４７７ 電圧緩衝回路 Ｂ 浴槽 Ｒ 浴室 1 Heartbeat information notification system 10 bath water heater 20a Operation remote controller for bathroom 20b Kitchen remote control 31, 32, 33 Heartbeat detection electrodes (electrodes) 40 Heart rate calculation unit (electrocardiographic signal processing device) 41 First Filter Circuit 42 Differential amplifier circuit 43 Second Filter Circuit 44 amplifier circuit 45 microcomputer 46 serial interface 47 reference level stabilizing circuit (reference level stabilizing means) 471 Negative integrator circuit 472 operational amplifier 473,476 resistance 474,475 capacitors 477 voltage buffer circuit B bathtub R bathroom
───────────────────────────────────────────────────── フロントページの続き (72)発明者 森田 哲司 大阪府大阪市中央区平野町四丁目１番２号 大阪瓦斯株式会社内 (72)発明者 尾崎 光 大阪府大阪市中央区平野町四丁目１番２号 大阪瓦斯株式会社内 (72)発明者 藤井 元 大阪府大阪市中央区平野町四丁目１番２号 大阪瓦斯株式会社内 Ｆターム(参考） 4C017 AA02 AB10 AC16 FF30 4C027 AA02 CC00 EE00 EE01 EE05 EE08 FF02 GG11 GG18 JJ00 KK00 KK03 KK07 4C094 AA01 BB14 BB20 BC30 DD14 FF18 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Tetsuji Morita 4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture Within Osaka Gas Co., Ltd. (72) Inventor Hikaru Ozaki 4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture Within Osaka Gas Co., Ltd. (72) Inventor Gen Fujii 4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture Within Osaka Gas Co., Ltd. F-term (reference) 4C017 AA02 AB10 AC16 FF30 4C027 AA02 CC00 EE00 EE01 EE05 EE08 FF02 GG11 GG18 JJ00 KK00 KK03 KK07 4C094 AA01 BB14 BB20 BC30 DD14 FF18
Claims (3)
れた入浴者の心電信号に基づいて、所定の信号処理を行
う心電信号処理装置において、 前記電極によって検出された心電信号の基準レベルを、
所定のレベルに維持する基準レベル安定化手段を備えて
いることを特徴とする心電信号処理装置。1. An electrocardiographic signal processing device for performing predetermined signal processing based on a bather's electrocardiographic signal detected by an electrode installed in a bathtub, wherein a reference of an electrocardiographic signal detected by said electrode is provided. Level
An electrocardiographic signal processing device comprising: a reference level stabilizing means for maintaining a predetermined level.
差動増幅する差動増幅回路を備えており、 前記基準レベル安定化手段は、前記差動増幅回路の出力
から、心電信号よりも低い周波数成分を符号を反転した
状態で入力側に負帰還をかける負帰還回路によって構成
されている請求項１に記載の心電信号処理装置。2. A differential amplifier circuit for differentially amplifying an electrocardiographic signal detected by the electrode is provided, wherein the reference level stabilizing unit outputs an electrocardiographic signal from an output of the differential amplifier circuit. The electrocardiographic signal processing device according to claim 1, wherein the electrocardiographic signal processing device comprises a negative feedback circuit that applies negative feedback to the input side in a state where the sign of the low frequency component is inverted.
出力から、負積分回路を介して入力側に負帰還をかける
ようになっている請求項２に記載の心電信号処理装置。3. The electrocardiographic signal processing device according to claim 2, wherein the negative feedback circuit applies negative feedback from the output of the differential amplifier circuit to the input side via a negative integrator circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001348693A JP3772108B2 (en) | 2001-11-14 | 2001-11-14 | ECG signal processor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001348693A JP3772108B2 (en) | 2001-11-14 | 2001-11-14 | ECG signal processor |
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| Publication Number | Publication Date |
|---|---|
| JP2003144404A true JP2003144404A (en) | 2003-05-20 |
| JP3772108B2 JP3772108B2 (en) | 2006-05-10 |
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ID=19161476
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001348693A Expired - Fee Related JP3772108B2 (en) | 2001-11-14 | 2001-11-14 | ECG signal processor |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109464745A (en) * | 2018-12-25 | 2019-03-15 | 东莞晋杨电子有限公司 | A kind of novel pulse therapeutic device based on biological negative-feedback |
| CN112869749A (en) * | 2021-01-15 | 2021-06-01 | 天津大学 | Non-contact electrocardio detection circuit |
| CN113679391A (en) * | 2021-08-24 | 2021-11-23 | 武汉中旗生物医疗电子有限公司 | Electrocardio baseline drift filtering device, electrocardio signal sampling system and electrocardio signal sampling method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109464745A (en) * | 2018-12-25 | 2019-03-15 | 东莞晋杨电子有限公司 | A kind of novel pulse therapeutic device based on biological negative-feedback |
| CN109464745B (en) * | 2018-12-25 | 2024-02-13 | 东莞晋杨电子有限公司 | Novel pulse treatment device based on biological negative feedback |
| CN112869749A (en) * | 2021-01-15 | 2021-06-01 | 天津大学 | Non-contact electrocardio detection circuit |
| CN113679391A (en) * | 2021-08-24 | 2021-11-23 | 武汉中旗生物医疗电子有限公司 | Electrocardio baseline drift filtering device, electrocardio signal sampling system and electrocardio signal sampling method |
| CN113679391B (en) * | 2021-08-24 | 2024-03-19 | 武汉中旗生物医疗电子有限公司 | Electrocardiogram baseline drift filter device, electrocardiosignal sampling system and sampling method |
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| Publication number | Publication date |
|---|---|
| JP3772108B2 (en) | 2006-05-10 |
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