JP2956625B2 - Monitoring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a monitoring apparatus, and more particularly to a monitoring apparatus for taking an electrocardiogram of a patient using a cardiac pacemaker (hereinafter, simply referred to as a pacemaker).

[0002]

2. Description of the Related Art A schematic diagram of an electrocardiogram of a healthy person is shown in FIG. In this waveform, the sharp portion at the center is called an R wave. The R wave is used for heart rate measurement and arrhythmia detection.
However, as shown in FIG. 4B, in addition to a signal a (hereinafter referred to as an electrocardiogram signal) caused by the activity of the heart, a pulse b (hereinafter referred to as a pulse signal) generated by the pacemaker is included in the electrocardiogram of the patient using the pacemaker. (Referred to as a pacemaker signal). Then, in the measurement of the heart rate and the like, the R wave and the pacemaker signal are confused, and an accurate measurement value cannot be obtained. Therefore, it is necessary to remove the pacemaker signal. FIG. 5 is a block diagram showing a configuration of a conventional monitoring device having a function of removing a pacemaker signal from an electrocardiogram. A waveform signal including an electrocardiogram signal and a pacemaker signal is derived from the body surface of the human body via the electrode 51. However, the voltage level of the electrocardiogram signal is on the order of several mV, while the voltage level of the pacemaker signal is on the order of several volts. Therefore, the same A / D signal is used for the electrocardiogram signal and the pacemaker signal.
A / D conversion cannot be performed in the dynamic range of the converter. Therefore, both of them are A / D converted by different A / D converters.

[0003] That is, the waveform signal derived from the electrode 51 is amplified by the amplifiers 52a and 52b.
After the A / D conversion in the dynamic range of the voltage level of the electrocardiogram signal in 3a, it is sent to the waveform processing unit 54 of the central processing unit (hereinafter referred to as CPU) of the computer. The waveform signal amplified by the amplifier 52a is also output to a pacemaker signal detection circuit 58. The pacemaker signal detection circuit 58 includes a high-pass filter 58a and a comparator 58b, and can detect a pacemaker signal having a high frequency component and a voltage level equal to or higher than a certain level. Pacemaker signal detection circuit 58
Output from the A / D converter 53b
Is A / D converted and sent to the waveform processing unit 54. The waveform processing unit 54 removes the pacemaker signal from the output signal of the A / D converter 53a with reference to the pacemaker signal output from the A / D converter 53b, and obtains an electrocardiogram signal from which the pacemaker signal has been removed. The electrocardiogram signal output from the waveform processing unit 54 and the pacemaker signal output from the A / D converter 53b are sent to the waveform processing unit 56.
The waveform processing unit 56 performs heart rate measurement and the like, and performs CRT
Display the waveform on the screen.

[0004]

As described above, there is a difference of more than 100 times between the voltage level of the electrocardiogram signal and the voltage level of the pacemaker signal. Therefore, A / D conversion cannot be performed in the dynamic range of the same A / D converter, and A / D conversion is performed by different A / D converters. Therefore, a circuit for extracting only the pacemaker signal from the waveform signal derived from the electrode is required, and there has been a problem that the circuit is complicated. Further, two signals processed through different paths are input to the waveform processing unit. That is, one is a signal processed by an amplifier and an A / D converter, the other is a high-pass filter,
This is a signal processed by the comparator and the A / D converter. Since a time phase difference occurs between the two signals processed by these different paths, there has been a problem that it is difficult to completely remove the pacemaker signal by the waveform processing unit.

Further, since the pacemaker signal detection circuit is constituted by hardware, the detection capability for the pacemaker signal, for example, the detection sensitivity, is uniquely determined. However, since the maximum amplitude value and the frequency component of the pacemaker signal differ depending on the type of pacemaker, there has been a problem that the detection process cannot flexibly cope with all types of pacemakers. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a monitoring device that completely eliminates a pacemaker signal with a simple circuit regardless of the type of the pacemaker.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for amplifying a waveform signal derived from the surface of a human body, wherein the amplified waveform signal has the same A / D converter. The gain of the amplifier is changed according to the voltage level of the waveform signal so that the A / D conversion is appropriately performed in
A signal other than an electrocardiogram signal is removed from the D-converted signal.

[0007] More specifically, a first aspect of the invention, page
And an electrode for deriving a waveform signal from the patient's body surface for use Sumeka, a variable gain control amplifier connected to the electrode, is connected to the output side of the variable gain control amplifier and variable <br/> variable gain control amplifier Gain signal generating circuit for outputting a gain signal corresponding to the voltage level of the output signal of the above, an A / D converter connected to the output side of the variable gain control amplifier, and the A / D converter and the gain signal generating circuit, respectively. It is connected to the output side and page a gain signal from the output signal of the a / D converter based on
Waveform processing means for removing a maker signal , wherein the variable gain control amplifier is connected to the output side of the gain signal generation circuit.
And by changing the gain based on the gain signal is the output signal of the variable gain control amplifier for controlling the voltage level of the output signal of the variable gain control increase spokes unit to ensure proper A / D conversion by the A / D converter Means . According to a second aspect of the present invention, in the first aspect, the waveform processing means receives the output signal of the A / D converter and the gain signal, and converts the pacemaker signal from the output signal of the A / D converter based on the gain signal. Pacemaker signal detecting means for detecting and outputting, an output signal of the A / D converter and an output signal of the pacemaker signal detecting means
And a pacemaker signal removing means for removing the output signal of the pacemaker signal detecting means from the output signal of the A / D converter.

[0008] The invention according to claim 3 provides a pacemaker.
An electrode for deriving a waveform signal from a body surface of a patient to be used ;
A variable gain control amplifier connected to the electrode, an A / D converter connected to the output side of the variable gain control amplifier,
Waveform processing means for removing the pacemaker signal from the output signal of the A / D converter outputs a gain signal corresponding to the voltage level of the output signal of the A / D converter is a connected to the output side and the A / D converter The variable gain control amplifier is connected to the output side of the waveform processing means and is based on the gain signal .
Hazuki variable gain so that the output signal of varying the gain variable gain control amplifier is suitably A / D converted by the A / D converter
Including means for controlling the voltage level of the output signal of the control amplifier.
It is no thing. Further, in the invention of claim 3 of claim 4, the waveform processing means, the output signal of the A / D converter is input
Re and the gain signal generating means and, A / D converter output signal and the gain signal is input barely based on gain signal A / D for outputting a gain signal corresponding to the voltage level of the output signal
A pacemaker signal detecting means for detecting and outputting a pacemaker signal from the output signal of the transducer, the output signal of the output signal and the pacemaker signal detecting means of the A / D converter input
And a pacemaker signal removing means for removing the output signal of the pacemaker signal detecting means from the output signal of the A / D converter.

[0009] The invention according to claim 5 provides a pacemaker.
An electrode for deriving a waveform signal from a body surface of a patient to be used;
Multiple amplifiers with different gains connected to this electrode
Amplifier bar having an output signal of any of the amplifiers
And an amplifier connected to the output of this amplifier bank
Switch signal in accordance with the voltage level of the output signal of the
Connected to the output side of the amplifier bank
Connected A / D converter, and the A / D converter and switching
Switching signal connected to the output side of each signal generation circuit
Based on the output signal of the A / D converter
A waveform processing means for removing, and the amplifier bank is switched.
Connected to the output side of the signal generation circuit and based on the switching signal
Increase by switching the output signal of the amplifier to be output.
The output signal of the width bank is properly converted by the A / D converter.
Voltage level of the output signal of the amplifier bank
It includes means for controlling . According to a sixth aspect of the present invention, in the fifth aspect, the waveform processing means includes an A / D converter.
Output signal and switching signal are input and based on the switching signal
Detects pacemaker signal from output signal of A / D converter
Signal detecting means for outputting a signal and an A / D converter
Output signal and output signal of pacemaker signal detecting means
Is input and the pace signal is output from the output signal of the A / D converter.
Pacemaker signal for removing the output signal of the power signal detection means
And a gradual removal means . According to a seventh aspect of the present invention , a waveform signal is generated from a body surface of a patient using a pacemaker.
And the gain connected to this electrode are different.
Output signals of any of the amplifiers
And the output side of the amplifier bank
Connected A / D converter and the output side of this A / D converter
Connected according to the voltage level of the output signal of the A / D converter.
Output switching signal and output signal of the A / D converter.
Signal processing means for removing the pacemaker signal from the signal.
The intensifier bank is connected to the output side of the waveform processing means.
Also, the output signal of the amplifier that is output based on the switching signal
The output signal of the amplifier bank is changed by A / D conversion
Output from the amplifier bank so that the A / D
It includes means for controlling the voltage level of the force signal .
In addition, the invention according to claim 8 is a method according to claim 7, wherein
The stage receives the output signal of the A / D converter and outputs
A switching signal that outputs a switching signal according to the voltage level of the signal
Generating means and the output signal and the switching signal of the A / D converter
The output signal of the A / D converter which is input and based on the switching signal
Pacemaker that detects and outputs a pacemaker signal from the signal
Power signal detecting means, an output signal of the A / D converter,
An output signal of the maker signal detecting means is input and A / D
Output of pacemaker signal detection means from output signal of converter
A pacemaker signal removing means for removing a signal.
It is.

A gain signal generating circuit or a waveform processing unit monitors the voltage level of the output signal of the variable gain control amplifier or the A / D converter to change the gain of the variable gain control amplifier;
The output signal of the variable gain control amplifier can be appropriately A / D converted by the A / D converter. Alternatively, the switching signal generation circuit or the waveform processing unit monitors the voltage level of the output signal of the amplifier bank or the A / D converter and selects an amplifier having an appropriate gain from among the amplifiers constituting the amplifier bank,
The output signal of the amplifier bank is properly A / D converted by the A / D converter.
Be able to convert. Therefore, signals other than the electrocardiogram signal such as a pacemaker signal having a high voltage level can be A / D converted by the same A / D converter as the electrocardiogram signal having a low voltage level. Therefore, a circuit for extracting only the pacemaker signal and performing A / D conversion is unnecessary. Further, since the electrocardiogram signal and other signals are A / D converted by the same A / D converter, no time phase difference occurs between the signals input to the waveform processing unit. The detection of the pacemaker signal is performed by a waveform processing means such as a CPU of a computer without using a pacemaker signal detection circuit. Therefore, the settings such as the detection sensitivity can be easily changed according to the type of the pacemaker.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. (First Embodiment) FIG. 1 is a block diagram showing a configuration of a monitoring apparatus according to a first embodiment of the present invention. The monitoring device shown in the figure includes an electrode 1, a variable gain control amplifier 2
a, 2b and the A / D converter 3 are connected in series,
The output signal of the A / D converter 3 is sent to a waveform processing unit 4a which is a waveform processing means such as a CPU of a computer, and the signal processed by the waveform processing unit 4a is sent to a waveform processing unit 6. Further, the gain signal generating circuit 5 includes the variable gain control amplifier 2
b, and outputs the gain signal to the variable gain control amplifiers 2a and 2b and the waveform processing unit 4a. The waveform processing means includes a pacemaker signal removing means and a pacemaker signal detecting means. A pacemaker signal detector 42a, which is a pacemaker signal detector, receives the output signal of the A / D converter 3 and the gain signal and outputs a pacemaker signal. The pacemaker signal removing unit 41a, which is a pacemaker signal removing unit, receives the pacemaker signal and the output signal of the A / D converter 3 and outputs an electrocardiogram signal.

Next, the operation of this embodiment will be described with reference to FIG. Waveform signals including an electrocardiogram signal and a pacemaker signal derived from the body surface of the human body via the electrode 1 are amplified by the variable gain control amplifiers 2a and 2b.
After being A / D converted by the D converter 3, it is sent to the waveform processing unit 4a. Further, the gain signal generation circuit 5 monitors the voltage level of the output signal of the variable gain control amplifier 2b, and sends a gain signal preset according to this voltage level to the variable gain control amplifiers 2a and 2b and the waveform processing unit 4a. Output. The variable gain control amplifiers 2a and 2b change the gain according to the gain signal, and the output signal of the variable gain control amplifier 2b is A / D
The voltage level of the output signal is controlled so that A / D conversion can be appropriately performed in the same dynamic range of the converter 3. That is, since the voltage level of the pacemaker signal is 100 times or more higher than the voltage level of the electrocardiogram signal, the gain is reduced for the pacemaker signal.

An A / D signal is supplied to the pacemaker signal detecting section 42a.
The output signal of the converter 3 and the gain signal output from the gain signal generation circuit 5 are input. Pacemaker signal detector 4
2a, for example, reproduces a waveform signal derived from the electrode 1 by calculation based on the input signal, and discriminates a pacemaker signal from the reproduced signal by a voltage level and a frequency component and outputs the signal. Alternatively, a portion where the gain of the variable gain control amplifiers 2a and 2b is suppressed is detected from the gain signal, and if the output signal of the A / D converter 3 at that time contains a high frequency component, the output signal Is recognized as a pacemaker signal and output. While the pacemaker signal is being output from the pacemaker signal detection unit 42a, the pacemaker signal removing unit 41a holds the voltage level of the output signal of the A / D converter 3 at a value immediately before the pacemaker signal is output, and The pacemaker signal is removed from the output signal of the D converter 3. In addition, the pacemaker signal detection unit 4
2a distinguishes the electrocardiogram signal and the pacemaker signal by the voltage level and the frequency component, so that the voltage level is higher than the electrocardiogram signal, and noise having a high frequency component can also be distinguished from the electrocardiogram signal. Therefore, in addition to the pacemaker signal, the pacemaker signal removing unit 41a can remove noise having a higher voltage level and higher frequency components than the electrocardiogram signal.

The electrocardiogram signal output from the pacemaker signal removing section 41a is subjected to a low-pass filter (not shown) to remove noise on the electrocardiographic signal, and then to a waveform processing section 6.
Sent to The pacemaker signal output from the pacemaker signal detection circuit is also sent to the waveform processing unit 6. The waveform processing unit 6 performs R wave detection, heart rate measurement, arrhythmia detection, and the like based on these signals, displays a waveform on a CRT screen or a liquid crystal display screen, and records waveform data on a recorder.

(Second Embodiment) Next, a second embodiment of the monitoring apparatus according to the present invention will be described. FIG. 2 is a block diagram showing the configuration of a second embodiment of the monitoring device according to the present invention. In the monitoring device shown in FIG. 3, the function of the gain signal generation circuit 5 in FIG. 1 is realized by a waveform processing unit 4b. Therefore, only different parts from the first embodiment will be described.

The monitoring device shown in FIG. 2 has an electrode 1, variable gain control amplifiers 2a and 2b, and an A / D converter 3, which are connected in series. The output signal of the A / D converter 3 is a waveform processing unit. 4b, the gain signal is output from the waveform processing unit 4b to the variable gain control amplifiers 2a and 2b, and the signal processed by the waveform processing unit 4b is sent to the waveform processing unit 6. The waveform processing section 4b includes a pacemaker signal removing section 41b as a pacemaker signal removing section, a pacemaker signal detecting section 42b as a pacemaker signal detecting section, and a gain signal generating section 43b as a gain signal generating section.

The gain signal generator 43b monitors the voltage level of the output signal of the A / D converter 3, and outputs a gain signal preset according to this voltage level to the variable gain control amplifier 2.
a, 2b and a pacemaker signal detection unit 42b. Variable gain control amplifier 2 to which this gain signal is input
a, 2b and the pacemaker signal detection unit 42b
Operates in the same manner as the variable gain control amplifiers 2a and 2b and the pacemaker signal detection unit 42a in FIG. As described above, in the present embodiment, the gain signal generation circuit 5 shown in FIG.
Is provided in the waveform processing unit 4b, so that the gain signal generation circuit 5 can be omitted, and the circuit becomes simpler than the monitoring device shown in FIG.

(Third Embodiment) Next, a third embodiment of the monitoring apparatus according to the present invention will be described. FIG. 3 is a block diagram showing the configuration of the third embodiment of the monitoring device according to the present invention. The monitoring device shown in FIG. 2 is obtained by replacing the variable gain control amplifiers 2a and 2b in FIG. 1 with an amplifier 2c and an amplifier bank 2d, and replacing the gain signal generation circuit 5 in FIG. 1 with a switching signal generation circuit 7. . Therefore, only different parts from the first embodiment will be described.

The monitoring device shown in FIG. 3 has an electrode 1, an amplifier 2c, an amplifier bank 2d, and an A / D converter 3 connected in series. The output signal of the A / D converter 3 is a waveform processing unit 4c. The signal processed by the waveform processing unit 4c is sent to the waveform processing unit 6. Further, the switching signal generation circuit 7 monitors the voltage level of the output signal of the amplifier bank 2d, and outputs a switching signal preset according to the voltage level to the amplifier bank 2d and the waveform processing unit 4c.

The amplifier bank 2d is composed of a plurality of amplifiers 2d-1, 2d-2,..., 2dn (n is an integer of 2 or more) having different gains, and an output switch 2d '. The output changeover switch 2d 'selects one of the amplifiers 2d-1 to 2d-n whose output signal can be appropriately A / D-converted in the same dynamic range of the A / D converter 3 in accordance with the switching signal. Then, the output signal of the selected amplifier is sent to the A / D converter 3. The waveform processing unit 4c
The output signal of the A / D converter 3 and the switching signal output from the switching signal generation circuit 7 are input, the pacemaker signal is discriminated from the output signal of the A / D converter 3, and the electrocardiogram signal and the pacemaker signal are subjected to waveform processing. Send it to the unit 6.

In this case, an independent switching signal generating circuit 7 like the monitoring device shown in FIG.
To monitor the output signal of the amplifier bank 2d. However, as in the monitoring device shown in FIG. The output signal of the / D converter 3 may be monitored. In addition, regarding the electrode 1, in FIG. 1 to FIG. 3, three-electrode input is used.

[0022]

As described above, according to the present invention, A
Since the voltage level of the signal input to the / D converter is adjusted by the variable gain control amplifier or amplifier bank in the preceding stage, the electrocardiogram signal and the pacemaker signal are converted to the same A / D signal.
A / D conversion can be performed by the converter. Therefore, a circuit for extracting only the pacemaker signal and performing A / D conversion becomes unnecessary. For this reason, the circuit can be simplified, and a small monitoring device can be realized.

Since the electrocardiogram signal and the pacemaker signal are A / D-converted by the same A / D converter, there is no time phase difference between the electrocardiogram signal and the pacemaker signal when input to the waveform processing section. . Therefore, an electrocardiogram signal from which the pacemaker signal has been completely removed in the waveform processing section can be obtained. Further, since the detection of the pacemaker signal is performed by the waveform processing unit such as the CPU of the computer, the setting of the detection sensitivity and the like can be easily changed according to the type of the pacemaker. Thus, electrocardiograms of patients using various types of pacemakers can be taken.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of a monitoring device according to the present invention.

FIG. 2 is a block diagram illustrating a configuration of a monitoring device according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a third embodiment of the monitoring device according to the present invention.

FIG. 4 is a schematic diagram of an electrocardiogram of a healthy person and a patient using a pacemaker.

FIG. 5 is a block diagram illustrating a configuration of a conventional monitoring device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electrode, 2a, 2b ... Variable gain control amplifier, 2c, 2
d-1, 2d-2, 2dn -... amplifier, 2d ... amplifier bank, 2d '... output changeover switch, 3 ... A / D converter,
4a, 4b, 4c, 6 ... waveform processing units, 41a, 41b,
41c: pacemaker signal removing section, 42a, 42b, 4
2c: pacemaker signal detection unit; 43b: gain signal generation unit; 5: gain signal generation circuit; 7: switching signal generation circuit.

Claims (8)

(57) [Claims] 1. A an electrode for deriving a waveform signal from the body surface of the patient using the pacemaker, and a variable gain control amplifier connected to the electrode, is connected to the output side of the variable gain control amplifier and the friendly <br A gain signal generating circuit for outputting a gain signal corresponding to the voltage level of the output signal of the variable gain control amplifier, an analog-digital converter connected to the output side of the variable gain control amplifier, and the analog-digital converter
And a waveform processing means connected to the output side of each of the gain signal generation circuits and for removing a signal derived from the pacemaker from an output signal of the analog-digital converter based on the gain signal; An amplifier is connected to the output of the gain signal generation circuit.
Wherein connected to the force side and changing the gain based on the gain signal variable gain control amplifier of the output signal is the analog - proper analog-digital converter - the output signal of the variable gain control amplifier so as to digital conversion A means for controlling the voltage level of the monitor. 2. A method according to claim 1, wherein the waveform processing means, said analog - output signal and the <br/> gain signal of the digital converter is inputted and the based on the gain signal analog <br/> grayed The pacemaker from the output signal of the digital converter
A pacemaker signal detecting means for detecting and outputting a signal derived from said analog - output signal is the input of the output signal and the <br/> pacemaker signal detecting means to digital converter and before
Serial analog - monitoring apparatus characterized by and a pacemaker signal removing means for removing the output signal of the page <br/> Sumeka signal detecting means from the output signal of the digital converter. 3. An electrode for deriving a waveform signal from the body surface of a patient using a pacemaker, a variable gain control amplifier connected to the electrode, and an analog-to-digital converter connected to the output of the variable gain control amplifier. vessel with the analog - connected to the output side of the digital converter and the analog - derived from the pacemaker from an output signal of the digital converter - the analog outputs a gain signal corresponding to the voltage level of the output signal of the digital converter And a variable gain control amplifier , the output side of the waveform processing means.
And the gain is changed based on the gain signal.
Characterized in that it includes means for controlling the voltage level of the output signal of the variable gain control amplifier as digital conversion - an output signal of the variable gain control amplifier the analog - proper analog-digital converter Monitoring device. 4. The waveform processing unit according to claim 3, wherein an output signal of the analog-digital converter is input.
And a gain signal generating means for outputting a gain signal corresponding to the voltage level of the output signal, the analog - the A <br/> the output signal and the gain signal of the digital converter is input barely based on the gain signal analog - wherein the output signal of the digital converter Pesume
A pacemaker signal detecting means for detecting and outputting a signal derived from the chromatography mosquito, the analog - output signal of the output signal and the <br/> pacemaker signal detecting means to digital converter is input and before
Serial analog - monitoring apparatus characterized by and a pacemaker signal removing means for removing the output signal of the page <br/> Sumeka signal detecting means from the output signal of the digital converter. 5. The method according to claim 5, wherein the body surface of a patient using a pacemaker is used.
Electrode that derives a waveform signal from the electrodes, and a plurality of amplifiers connected to this electrode, each with a different gain.
An amplifier having an output signal of any of the amplifiers
And an amplifier bank connected to the output of the amplifier bank and the amplifier bank.
Output a switching signal according to the voltage level of the output signal of the
A switching signal generating circuit, and an analog-to-digital converter connected to an output side of the amplifier bank.
A digital converter, the analog-digital converter and the switching signal generator.
Connected to the output of each of the raw circuits and
From the output signal of the analog-to-digital converter
Waveform processing means for removing signals originating from a pacemaker
Wherein the amplifier bank is provided on the output side of the switching signal generation circuit.
The amplification connected and output based on the switching signal
By switching the output signal of the amplifier
Is properly output by the analog-to-digital converter.
The amplifier van is converted to be analog-to-digital.
Means for controlling the voltage level of the output signal of the
A monitoring device, characterized in that: 6. The apparatus according to claim 5, wherein said waveform processing means includes an output signal of said analog-digital converter and said output signal.
A switching signal is input and the analog signal is output based on the switching signal.
The pacemaker from the output signal of the
Signal that detects and outputs signals originating from the
Means out, the analog - digital converter output signal and the
Before the output signal of the pacemaker signal detecting means is input and
From the output signal of the analog-digital converter,
Pacemaker for removing the output signal of the maker signal detecting means
A monitoring device, comprising:
Place. 7. The method according to claim 1, wherein the body surface of the patient uses a pacemaker.
Electrode that derives a waveform signal from the electrodes, and a plurality of amplifiers connected to this electrode, each with a different gain.
An amplifier having an output signal of any of the amplifiers
And an analog-to-digital converter connected to the output of the amplifier bank.
Digital converter and whether it is connected to the output side of this analog-digital converter.
The voltage level of the output signal of the analog-to-digital converter
A switching signal is output according to the bell and the analog
-From the output signal of the digital converter to the pacemaker
Waveform processing means for removing a signal originating from the input means , wherein the amplifier bank is connected to an output side of the waveform processing means.
And the output of the amplifier based on the switching signal
The output of the amplifier bank is switched by switching the output signal.
The input signal is properly analyzed by the analog-to-digital converter.
Log-to-digital conversion of the amplifier bank.
Including means for controlling the voltage level of the output signal
A monitoring device characterized by the above-mentioned. Claim 8. In claim 7, The waveform processing means, An output signal of the analog-digital converter is input.
Outputs a switching signal according to the voltage level of this output signal
Switching signal generating means for The output signal of the analog-to-digital converter and the
A switching signal is input, and the switch is input based on the switching signal.
From the output signal of the analog-to-digital converter,
Pacemaker signal that detects and outputs signals originating from the manufacturer
Signal detection means, The output signal of the analog-to-digital converter and the
Before the output signal of the pacemaker signal detecting means is input and
From the output signal of the analog-digital converter,
Pacemaker for removing the output signal of the maker signal detecting means
A monitoring device, comprising:
Place.