JP2007307309A - Device for detecting biological information by means of ultrasonic vibration sensor, indoor environment control method using biological information, and indoor environment controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To remotely control an environment adjusting device or the like by highly precisely detecting biological information such as heart beats and pulses when a person is in sleep or at rest through the use of an ultrasonic vibration sensor, rapidly and reliably transmitting the information to a remote place by a wireless or cable system, and using the detected biological information. <P>SOLUTION: The biological information detecting device is composed of: the ultrasonic vibration sensor; a PHS module or PHS modem for performing communication with the use of vibration data detected by the ultrasonic vibration sensor via a LAN and PHS lines forming a transmission path; a data communication base station for communicating with the module or modem; and a computer for processing the received data from the ultrasonic vibration sensor and calculating the biological information such as a heart rate, etc. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention detects biological information such as a human pulse rate and heart rate without being perceived by a human using an ultrasonic vibration detection sensor attached to a bed, and uses the detected biological information to detect the room temperature. The present invention relates to a biological information detection device using an ultrasonic vibration detection sensor that can automatically control an environmental condition such as sleep to an optimum environment for sleep, etc., an indoor environment control method using the biological information, and an environmental control device. is there.

In recent years, in hospitals and elderly facilities, etc., it is possible to improve nursing efficiency or to improve nursing care by intensively detecting and managing biological information such as movement and pulse rate, heart rate, etc. There is a strong demand for higher quality.
In addition, there is a demand for further promoting the recovery and enhancement of health by finely adjusting and maintaining the nighttime sleep environment of each hospital room and the like under optimal conditions according to the physical condition of the patient.

That is, a conventional sleep environment such as a hospital room generally employs a method in which the room temperature is detected by controlling the operation of the air conditioning equipment and the room temperature and humidity are maintained at set values.
However, the optimal sleep environment for people varies from patient to patient, and the method of controlling the operation of air conditioning equipment according to a pre-programmed schedule ensures an optimal sleep environment even in so-called single rooms. Difficult to do. This is because the optimal sleep environment changes from moment to moment depending on the biological conditions of each patient, and simply controlling the operation of air conditioning equipment based on temperature and humidity can cope with changes in biological conditions. Because there is no.

  Thus, in order to obtain an optimal environment for advanced sleep, it is best to detect biological information such as a person's body temperature and heart rate, and to control the operation of the air conditioning equipment based on the detected biological information. It is a policy. This is because there is a close relationship between biological information such as pulse rate and heart rate and sleep environment such as temperature and humidity, and when the sleep environment deteriorates, biometric information such as heart rate changes greatly. This is because it is known. Therefore, controlling the room temperature and temperature based on biological information such as heart rate is the most reliable method for achieving the optimal sleep environment.

  However, in order to detect human biological information, such as body temperature and heart rate, always wearing a body temperature detection sensor or heart rate monitor on the body gives the person a sense of restraint and pressure, and externally. Even if an optimal sleep environment can be obtained, the result is that the sleep environment is greatly deteriorated or hindered conversely psychologically or internally.

On the other hand, the inventors of the present application have previously developed a human state discriminating apparatus using an ultrasonic vibration detection sensor in order to control the patient's state on the bed in a remote place, and this is referred to as Japanese Patent Application Laid-Open No. 2004-216006. It is open to the public.
That is, as shown in FIG. 22, the apparatus attaches a sensor body B of an ultrasonic vibration detection sensor to an appropriate location on the bed A, so that minute vibrations caused by the movement of the patient C on the bed A, breathing, heart rate, etc. Detected by the sensor main body B of the ultrasonic vibration sensor, and analyzing the detected vibration signal in the transmission / reception control device V, the patient C's state, for example, sleeping or resting, during some operation, death Etc. and transmitted to a remote management room.

In FIG. 22, V ₁ is an ultrasonic transmission / reception unit, V ₂ is an A / D conversion unit, and V ₃ is a microcomputer.

FIG. 23 shows a basic configuration of the sensor body B of the ultrasonic sensor, B ₁ is a container body, B ₂ is water, B ₃ is an ultrasonic transducer, B ₄ is a cable, and a is a transmission signal. , B is a received signal, B5 is a water level, c is a transmitted ultrasonic wave, d is a received ultrasonic wave, ap ′, ap, b ′, and bp are various processing signals in the transmission / reception control device V.

  In the apparatus according to the Japanese Patent Application Laid-Open No. 2004-216006, it is possible to determine the movement of the person (patient) C on the bed A (that is, resting, operating, sleeping or dead) relatively accurately, and The result can be accurately transmitted to a remote place by a wired or wireless system, and has excellent practical utility.

  However, in the device disclosed in Japanese Patent Laid-Open No. 2004-216006, it is difficult to accurately detect more detailed dynamics during sleep or rest of a person (patient) C, such as heart rate and pulse rate. In Japanese Patent Application Laid-Open No. 2004-216006, the limit is to determine the life / death of the patient and the presence / absence of the patient in the bed.

  As described above, in this type of human biometric discrimination device, it is impossible to detect detailed biometric information such as the heart rate of a sleeping human and the room based on the detected biometric information. There is a problem that temperature, humidity, etc. cannot be controlled to optimum values for sleep of individual patients.

JP2004-216006 JP2003-315030A

  The present invention is capable of discriminating whether a person is sleeping or resting, or whether a person is alive or dead, etc., in the state determination apparatus for a person using a conventional ultrasonic vibration sensor. It is difficult to detect detailed biological data such as a person's heart rate, etc., and it is difficult to detect a heart rate without giving a person discomfort or anxiety, and the detected heart rate This is to solve the problem that the environmental control device etc. is not controlled using the sleep environment as the control standard of the sleep environment. Without giving any pleasant feeling or discomfort at all, the heart rate etc. during human sleep is detected indirectly and continuously with high accuracy, and the human sleep environment is more optimal using the detected biological information Ultrasonic vibration detection that can be controlled A detection device of the biological information by the capacitors, is to St. provide indoor environment control method and indoor environmental control device using biological information.

In order to solve the problems of the present invention, the invention of claim 1 of the present application comprises a sensor body 5e attached to a bed 11, a control unit 5f comprising an ultrasonic transmitter / receiver 9 and a control myco 10, and the control unit 5f vibrating with obtaining data Xo, the upper hull lines U and the lower hull of vibration data X _O vibration data obtained by sampling a long time t every _two than the time t ₁ from X ₁ by sampling every fixed time interval t ₁ in An ultrasonic vibration detection sensor 5 that calculates the route D and outputs an amplitude difference P _w between them, a PHS module or PHS modem 4 that outputs the calculated amplitude difference P _W from the ultrasonic vibration detection sensor 5, and A data communication base station 2 that communicates with the PHS module or PHS modem 4, and is connected to the data communication base station 2 via a LAN 3, and the PHS module The amplitude difference P _W of each of the time t ₂ that is input via the Lumpur or PHS modem 4 while resampling vibration data of time t per ₁ by linear approximation, Fn from the resampled data R = A _O + A _{1 + a 2 + a n-} 1 / n where, n is a suitable number of points, a _O to a _n are after amplitude data was smoothed by the moving average of every n number of points by the amplitude value) in each point, the smooth A digital filter based on a product-sum operation corresponding to a bandpass filter of 0 Hz to 10 Hz is performed on the converted amplitude data T, and an average time M between peak points P in 10 seconds from the data Td on which the digital filter is performed And a computer 1 that calculates the heart rate Xa from the average time M as Xa = 60 / M (times / min). It is an present configuration.

  The invention of claim 5 detects the heart rate or pulse rate of a person sleeping on the bed 11 using the biological information detecting device of claim 1, and the detected value of the heart rate or pulse rate is 80 times. / Min or more, a control signal is transmitted from the computer 1 of the biological information detection device to the environment control device 7, and the indoor environmental conditions are adjusted via the environment control device 7 by the control signal.

The invention of claim 6, and a control unit 5f consisting sensor body 5e and ultrasonic transceiver 9 and the control mycobacteria 10 was mounted on the bed 11, by sampling every fixed time interval t ₁ in the control unit 5f The vibration data Xo is obtained, and the upper envelope line U and the lower envelope line D of the vibration data X ₁ for each time t ₂ longer than the time t ₁ are calculated from the vibration data X _O to obtain the amplitude difference P _w between them. The ultrasonic vibration detection sensor 5 to output, the PHS module or PHS modem 4 to output the calculated amplitude difference P _W from the ultrasonic vibration detection sensor 5, and data communication to communicate with the PHS module or PHS modem 4 The time t ₂ connected to the base station 2 and the data communication base station 2 via the LAN 3 and inputted via the PHS module or the PHS modem 4 With resampling the vibration data of time t per ₁ by linear approximation the amplitude difference P _W of each, Fn from the resampled data _{R = A O + A 1 +} A 2 + A n-1 / n ( where, n is the appropriate After the amplitude data is smoothed by a moving average for each of n points according to the number of points (A _{O to An} is an amplitude value at each point), the smoothed amplitude data T corresponds to a bandpass filter of 0 Hz to 10 Hz. In addition, the digital filter by the product-sum operation is performed, and the average time M between the peak points P in 10 seconds is calculated from the data Td subjected to the digital filter, and the heart rate Xa is calculated from the average time M as Xa = A computer 1 which calculates as 60 / M (times / min) and transmits the environmental control signal E when the calculated heart rate Xa exceeds 80 times / min; Connected to the computer 1 via the LAN 3, in which the basic configuration of the invention that consisted environment control device 7 for adjusting the operation of the environmental system by environment control signal E.

In the present invention, the vibration based on the biological activity of the subject on the bed detected by the sensor body 5e attached to the bed 11 is sampled every time t _1, and the sampled vibration data X _O is sampled data X every time t _{2. 1} is used, and the vibration detection sensor 5 that calculates the upper limit comprehensive line U and the lower limit comprehensive line D and outputs the amplitude difference P _W between the two is used to calculate the detected amplitude difference P _W from the vibration detection sensor 5. The data is transmitted to the computer 1, and in the computer 1, the amplitude difference P _W is resampled into vibration data R every time t ₁ , and a moving average is performed every n points to obtain the smoothed amplitude data T. Then, a digital filter based on a product-sum operation corresponding to a bandpass filter of a predetermined frequency is performed to obtain data Td, and between the data peaks, the data Td An average time M is calculated, and the heart rate (or pulse rate) of the subject is detected based on the calculated average time M.

As a result, it is possible to obtain a heart rate that is close to the value detected by the electrocardiograph or pulse meter by data processing of the vibration data X _O , and to receive and receive various data by combining with the PHS and LAN systems. Transmission can be performed accurately and reliably.

  In addition, based on the obtained heart rate, it becomes possible to adjust the indoor environment of the subject to the optimum environmental conditions for sleep, and without detecting any psychological pressure on the subject, the detected heart rate, etc. It becomes possible to construct a new environmental adjustment system based on the above.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an overall configuration diagram of a living body information detection system and an indoor environment control system using living body information used in the present invention. 2 is a perspective view of the sensor main body 5e of the ultrasonic vibration detection sensor 5, and FIG. 3 shows an example of a received waveform. Further, FIG. 4 is an explanatory diagram showing a part of a processing method of data detected by the sensor body 5e, and FIG. 5 is a control circuit configuration diagram of the ultrasonic vibration detection sensor.

  Referring to FIG. 1, a living body information detection system and a living room information control system using living body information according to the present invention include a personal computer 1 that performs various arithmetic processing and data processing described later, and a No1 data communication base station (biological information). Detection relationship) 2A and No2 data communication base station (general-purpose PLC (sequencer) (indoor environment adjustment relationship)) 2B, LAN 3 that communicates the personal computer 1 and data communication base stations 2A, 2B, PHS module 4A and / or PHS It comprises a modem 4B, ultrasonic vibration detection sensors 5A and 5B, a PHS line 6A, a control line 6B, an environmental control device 7 for heat source, lighting, air conditioning, temperature, etc., a cable 8, and the like.

The PHS module 4A and the ultrasonic detection sensor 5A are formed in a so-called integrally assembled state, and the PHS modem 4B and the ultrasonic detection sensor 5B are formed as separate bodies. Are connected by a cable 8.
In FIG. 1, the use of three ultrasonic detection sensors 5 and the control of three environmental control devices 7 are performed, but the number of detection sensors and the like are increased according to the number of detection targets. Of course.
Furthermore, since each component of the system itself is known except for the processing method of the vibration detection signal from the ultrasonic detection sensor in the personal computer 1, its detailed description is omitted here.

Referring to FIG. 2, the ultrasonic vibration detection sensor 5 includes a sensor body 5e and a control unit 5f. The sensor main body 5e includes a main body container 5a, an ultrasonic transducer 5b disposed at the bottom of the main body container 5a, and a liquid 5d such as water sealed so as to form a liquid surface 5c in the main body container 5a. Has been. The upper side of the liquid surface 5c is a space. Further, the control unit 5 f is formed of an ultrasonic transceiver 9 and a control microcomputer 10.
The ultrasonic wave is generated by driving the ultrasonic transducer 5d (center frequency: 2 MHz) by the ultrasonic transmitter / receiver 9, and is transmitted from the bottom of the water tank into the water tank body 5a, reflected by the water surface 5c, and then ultrasonic waves again. Received by the vibrator 5b. FIG. 3 shows an example of a received waveform. In FIG. 3, the waveform indicated by S is a reflected wave from the water surface, and the maximum value is the object of analysis in the present invention.

As is well known, the maximum amplitude value of the reflected wave S changes depending on the intersection angle between the water surface 5c and the vibrator 5b even at the same vibration strength, and the attenuation of the reflected ultrasonic wave S increases as the intersection angle increases. The maximum amplitude value decreases. Further, when the water surface 5c is in a wavy state due to vibration, the maximum amplitude value of the received waveform S also varies greatly.
In other words, the data acquired by the ultrasonic vibration detection sensor 5 is a temporal change in the maximum amplitude value of the received waveform, and the acquisition of the received waveform by the sensor 5 can be performed at intervals of 2 ms to 100 ms. . In addition, the maximum amplitude value of the received waveform acquired at a predetermined time interval, for example, every 0.1 sec is plotted as time series data S ₁ of vibration detection (FIG. 4A), and thereafter, each plot data S ₁ is continuously displayed. By normalization, analysis data S ₂ (FIG. 4B) is obtained.

FIG. 5 is a block diagram of a control system of the ultrasonic vibration detection sensor 5 according to the present invention, from the microcomputer 10 of the control unit 5f attached to the ultrasonic vibration detection sensor 5 to the transmission circuit 9a of the ultrasonic transmitter / receiver 9. The transmission pulse ao is generated at the transmission timing. Further, after generation of the transmission pulse ao, a reception permission pulse bo is generated.
This is to enable the reception circuit 9b to receive the reception signal b without being saturated with the transmission pulse ao.
Next, the intensity signal e of the received signal b is analog / digital converted and taken into the microcomputer 10, and at this time, an operation for adjusting the received signal b to a specified value is performed by a reference setting operation. Specifically, the received intensity e is compared with the reference, and the gain is changed by automatic gain adjustment based on the difference, and the output is matched with the reference. The reception gain control signal f for this purpose is output as a gain setting voltage using the D / A output of the microcomputer. As a result, it is possible to reliably detect minute changes.

The signal intensity e captured through the A / D port of the control microcomputer 10 is processed in the control microcomputer 10 according to a predetermined algorithm.
In this process, vibration data from the vibration sensor 5 is collected every 20 ms, one of the following data is obtained based on the average of the collected two data, and this is communicated and output.
1. Amplitude (AD) value (cycle: 20 ms)
2. Maximum-minimum difference P _W value (hereinafter referred to as P-P average) and average value (period: 100 ms to 2 s specified (* 20 ms base quantum)).
The processing results are output to the outside by the PHS module as various signals.

  A new product that integrates two ANC-01 types (5B) manufactured by Nippon Medical Equipment Co., Ltd. and an ANC-01 type manufactured by Japan Medical Equipment Co., Ltd. into the PHS module (PS). (5A) One unit is used, and the data communication base station 2 and each PHS modem 6A are connected by TCP / IP, and the personal computer 1 and the data communication base station 2 are connected by LAN with 10BASE-T. The system shown in FIG. 1 was configured, and the received data in the personal computer 1 was checked.

  Since the baud rate setting of the ultrasonic vibration detection sensor 5 is 38400 bps and one data is 5 bytes, the sampling data interval cannot be shorter than 2 ms. For this reason, a measurement program was created and installed in the personal computer 1 under the fastest condition with three units connected at a data interval of 2 ms, and the presence or absence of acquisition of received data from the ultrasonic vibration detection sensor 5 was investigated. Tables 1 to 5 show the results of the investigation, and it was confirmed that the system of FIG. 1 can be operated without receiving data missing under these conditions.

  Incidentally, the maximum value of the error rate of the data reception number of the device 1 (integrated type of the PHS module 4A and the ultrasonic vibration detection sensor 5A) calculated from the data reception numbers in Tables 1 to 5 is + 0.072%. It was proved to be sufficient for practical use.

When a connection is made from the personal computer 1 side, an application on the personal computer 1 is moved in the client mode and a connection request is issued. In this case, if the data communication base station 2 recognizes the PHS modem 4 corresponding to the requested IP address, the data communication base station 2 returns Connect. At this point, the application recognizes that the connection is complete.
Although it cannot be seen from the personal computer 1 side, actually, after that, the data communication base station 2 makes an extension call to the target PHS modem 4 and the communication is started after the line is connected. For this reason, there is an error of several seconds until the actual communication starts after the application recognizes that the connection is completed. As a result of this test, it was found that the error was about 5 seconds, and within 10 seconds at the latest.
In this measurement program, the MOD command was issued after recognizing the Connect, the response was received, and the actual connection was completed. FIG. 6 shows a control flow of the PHS communication system for system operation according to the present invention.

  The control flow in FIG. 6 does not describe the operation of the data communication base station 2B, the environment control device 7, and the like, but if the subject's (patient) heart rate is equal to or higher than a set value as described later, A control signal E of the air conditioning equipment is sent from the personal computer 1 to adjust the operating status of each environmental control device 7.

  FIG. 7 shows an ultrasonic vibration detection sensor 5 attached to the bed 11, vibrations caused by the biological activity of the subject (person 12) sleeping on the bed 11 by the detection sensor 5, and the obtained bed 11. This shows a state in which a pulse wave (pulse) generated by a person is detected from detected vibration data, and the correlation with a heart rate monitor is mainly investigated.

In FIG. 7, reference numeral 5 denotes an ultrasonic detection sensor, which is fixed to the floor side of the bed 11. Reference numeral 9 denotes an ultrasonic transmitter / receiver, 10 denotes a control microcomputer 10, and the control unit 5 f of the ultrasonic vibration detection sensor 5 is formed by both members 9 and 10. Further, 13 is a heart rate monitor, 14 is a pulse wave meter, 15 is an AD converter of the heart rate monitor, 16 is an electrode of the heart rate monitor, 17 is a microphone for detecting a pulse wave, and 18 is a cable.
In the second embodiment, the signal from the control microcomputer 10 of the ultrasonic detection sensor 5 is not directly transmitted to the personal computer 1 through the PHS module 4 but directly to the personal computer 1 through the cable 18. However, it goes without saying that communication between the personal computer 1 and the ultrasonic vibration detection sensor 5 is possible using the LAN 3 and the PHS circuit 6 instead of the cable 18.
The heart rate monitor 13 is an electrocardiograph (Nihon Kohden Co., Ltd., ECG-9552), the pulse wave meter 14 is a CCI backs detector, and the ultrasonic sensor 5 is a Japanese medical device ( The ANC-01 type sensor of Co., Ltd. is used, and the electrocardiograph detects the potential difference between the right hand and the left foot by the second induction method of monopolar limb induction.

  The test subject was a 35-year-old boy (163 cm, 57 kg), measured for 200 sec at rest, and collected data from each detector 5, 13, 14 directly on the personal computer 1. In the ultrasonic vibration detection sensor 5, the sampling interval is 20 ms.

  As a result of the test, it was found that pulse waves such as heartbeats can be detected at rest, but pulse waves cannot be detected when the subject 12 is in a body motion state such as conversation.

  FIG. 8 shows a detection waveform (a) of the ultrasonic vibration detection sensor 5, a detection waveform (b) of the electrocardiograph 13, and a detection waveform (c) of the pulse wave meter 14 when the subject 12 is at rest. It is.

Next, calculation of the heart rate from the detection data by the ultrasonic vibration detection sensor 5 in the present invention will be described.
First, in the present invention, vibration data X _O is obtained from the ultrasonic vibration detection sensor 5 by sampling at intervals of t ₁ = 20 ms as described above (see FIG. 9).

Next, the upper limit inclusion line U and the lower limit inclusion line D of the sampling vibration data X ₁ at intervals of t ₂ = 0.1 s are calculated from the sampling original data X _{O at} intervals of 20 ms (FIG. 10). Thereafter, the difference P _W value (P-P average) between the upper limit comprehensive line U and the lower limit comprehensive line D is calculated, and the P-P value at intervals of 0.1 s is transmitted to the personal computer 1 via the PHS module 4 ( FIG. 11).

On the other hand, at the personal computer 1, using the data P _W (P-P value) of 0.1s intervals inputted via the PHS module 4, data for each 0.1s P _W (P-P Value) is resampled to vibration data every 20 ms by linear approximation, and resampled data R as shown in FIG. 12 is obtained.

Further, the computer 1 performs smoothing of the resampling data R by performing a moving average for every 15 points from the resampling data R every 20 ms shown in FIG. 12 using the following equation (1). Done.
F (n) = A _O + A ₁ + A ₂ + A _n-1 / n (where n is an appropriate number of points, and A _{O to An} are amplitude values at each point) (1)
FIG. 13 shows data T that is a result of smoothing by a moving average every 15 points.

Next, a digital filter by a product-sum operation corresponding to a bandpass filter with a frequency of 0.5 Hz to 1.8 Hz is performed on the amplitude data (T) smoothed by the moving average.
FIG. 14 shows data Td obtained by performing digital filter by product-sum operation on amplitude data T smoothed by the moving average of FIG.
FIG. 15 shows the attenuation characteristics of the band-pass filter used in the implementation of the digital filter, and substantially contains a frequency of 0 to 10 Hz. In addition, the digital filter in the arithmetic processing is implemented by calculating the filter coefficient sequence from the specified frequency characteristics of the bandpass filter and performing a product-sum operation on the input signal. is there.

Finally, an average time M between the peak points P in 10 seconds is calculated from the data Td subjected to the digital filter, and the heart rate Xa is calculated as 60 / M.
FIG. 16 is a diagram showing the extraction state of the peak point P. As shown in FIG.

In the present example, for the same subject 12, the heart rate was calculated by changing the attachment angle of the sensor body 5e of the ultrasonic vibration detection sensor 5 into three types. That is, when P _W (PP value) (average) of the original waveform of 20 ms sampling at rest is 350, 600, 800 (P when the mounting angle of the sensor body 5e is 0 ° (liquid level)). -Detection of the ultrasonic vibration detection sensor 5 by each of the above calculation processes for each of the cases where the average P value is the maximum and the mounting angle is large (the liquid surface inclination angle is large) P _W (P-P value) is reduced) The heart rate Xa calculated from the signal was compared with the detected value Ya from the heart rate monitor (electrocardiograph B).

As a result, as shown in FIGS. 17 and 18, the liquid level 5 c of the sensor body 5 e of the ultrasonic vibration detection sensor 5 is slightly inclined, and the P _W value (P P of the original waveform X _O when the subject 12 is at rest) (P The heart rate calculation value Xa ₂ when (−P average) is 600 levels is closest to the detection value Ya by the heart rate monitor 13, and it has been found that heart rate measurement with less error is possible.
17 and 18, X is the original waveform of the ultrasonic vibration detection sensor, Y is the original waveform of the heart rate monitor, Xa is the heart rate of the ultrasonic vibration detection sensor, Ya is the heart rate of the heart rate monitor, and Xa ₃ is PW. (PP average value) detected heart rate at level 350, Xa ₂ is detected heart rate at P _W (PP average level) 600, Xa ₁ is P _W (PP average value) level 800 This is the detected heart rate.

As is apparent from FIGS. 17 and 18, in the difference between the heart rate obtained from the electrocardiograph and the heart rate obtained from the data of the ultrasonic vibration detection sensor, the average error for each PP average level representing the angle is The PP average level 350 was 3.6 times / minute, the PP average level 600 was 1.4 times / minute, and the PP average level 800 was 3.6 times / minute.
In this way, although a difference of 10 times / minute or more is temporarily generated, not only is it understood that a result almost synchronized with the electrocardiograph is obtained throughout, but also the installation of the ultrasonic vibration detection sensor It is found that it is best to attach the liquid surface 5c with a small inclination angle so that the P _W value (PP average) of the detected vibration original waveform X _O at rest is about 600. did.

FIG. 19 shows the third embodiment of the present invention, and is an explanatory view showing the pulse detection state of the subject 12 on the bed 11.
In FIG. 19, the ultrasonic vibration detection sensor 5 (the ultrasonic transmitter / receiver 9 and the control microcomputer 10 forming the sensor body 5e and the control unit 5f) to be used is the same as that in FIG. Only the electrocardiograph 13 is changed to the Biomulti1000 type manufactured by NEC Corporation. Moreover, the electrode 16 is attached to the chest and is of a type in which data is transferred from the transmitter 13b to the main body 13a of the electrocardiograph 13 by radio.

In the third embodiment, for two subjects 12 sleeping, the pulse is continuously detected by the ultrasonic vibration detection sensor 5 and the electrocardiograph 13 for 8 hours, and the detection sensor 5 and the electrocardiograph 13 The detected values were compared.
The calculation of the heart rate from the detected vibration data by the ultrasonic vibration detection sensor 5 is performed by the same method as in the second embodiment.

As a result of the test, for one subject who was able to sleep for 8 hours from 22:00 to 6 o'clock, the heart rate (pulse rate) Xa calculated from the vibration data X _O of the ultrasonic vibration detection sensor 5 and the heart It was found that the detected value of the pulse rate Ya by the electrometer 13 was substantially consistent between 22:00 and 6:00.

On the other hand, because the room temperature is high, it was impossible to sleep well for 8 hours from 22:00 to 6:00. The amplitude of the P _W value (P−P average) of the vibration data X _O detected by the sensor 5 is increased, thereby the difference between the pulse Xa calculated from the original vibration data X _O and the pulse Ya obtained from the electrocardiograph. Turned out to be large.

  (A) and (b) of FIG. 20 show the time transition of the pulse of the latter subject (subject who could not sleep well due to heat) at 1 AM and 2 o'clock, and the room temperature increased at bedtime. When the subject is in a so-called sleepless state, the number of beats Xa detected by the ultrasonic vibration detection sensor 5 rises to a range of about 70 to 80 times / min or more, and the number of beats Ya by an actual electrocardiograph is also about 90 to 100. It became clear that it became more than times / min.

  That is, if the pulse rate Xa of the subject 12 on the bed 11 detected by the ultrasonic vibration detection sensor 5 is about 70 to 80 times / min or more, the subject 12 is in a sleepless state due to an increase in room temperature. The control signal E for operating the indoor environmental control device 7 is transmitted through the PHS module and the like based on the pulse rate (or heart rate) Xa, and the required operating state of the environmental control device 7 Is controlled.

  As can be seen from FIG. 20, when the pulse rate is about 90 times / min or more, the difference between the pulse detection value Xa by the ultrasonic vibration detection sensor 5 and the pulse detection value Ya by the electrocardiograph 13 becomes large. Therefore, in order to correct this by calculating the pulse detection value Xa, the condition of the “bandpass filter of moving average 15 and frequency 0.5 Hz to 1.8 Hz” is set to “moving average 11 and frequency 0.9 Hz to 2.Hz. Changed to “0 Hz bandpass filter”.

  The average difference for one hour between the pulse Xa by the ultrasonic vibration detection sensor 5 and the pulse Ya by the electrocardiograph 13 calculated based on the new analysis conditions is as shown in Table 6, and the frequency of the bandpass filter is increased. At the same time, by changing the extraction condition, the coincidence of both detected values Xa and Ya in a high pulse region can be improved, and the environmental conditions such as room temperature can be controlled with higher accuracy. It has been found.

  About the two test subjects 12 of the said Example 3, the average difference of the pulse every 5 minutes by the ultrasonic vibration detection sensor 5 and the electrocardiograph 13 at the time of daytime awakening, and the magnitude | size of the operation | movement on a bed are shown. The relationship with PP value standard deviation was investigated. As a result, it was found that as the PP value standard deviation is larger, the average difference of the pulse every 5 minutes by the ultrasonic vibration detection sensor 5 and the electrocardiograph 13 becomes larger. This is considered to be because the vibration due to the heart alone is hindered by the influence of physiological movement such as movement of the subject due to slight movement of the subject and movement of the diaphragm due to respiration.

Therefore, the ultrasonic vibration detection sensor 5 and the heart when the PP value standard deviation is limited to 50 or less in consideration of the influence of the movement of the subject on the bed, that is, the influence of the magnitude of the PP value standard deviation. The average difference of the pulse every 5 minutes with the electric meter 13 was investigated.
FIG. 21 shows the result, and it was found that when the PP value standard deviation is limited to 50 or less, high coincidence can be obtained between the detected values of both pulses.

  The present invention can be applied to all facilities equipped with sleeping facilities for people such as hospitals and elderly care facilities.

1 is an overall configuration diagram of a biological information detection system and an indoor environment control system using biological information used in the present invention. It is a perspective view of the main-body part of an ultrasonic vibration detection sensor. An example of the received waveform of an ultrasonic vibration detection sensor is shown. It is data processing explanatory drawing detected with the ultrasonic vibration detection sensor, (a) shows the case where the maximum amplitude value of each time of data acquired at 0.1 second intervals is put as time series data of vibration detection. (B) shows the analysis data when each plot data is normalized. 2 shows an example of a block configuration of a control system of an ultrasonic vibration detection sensor. 2 shows an example of a PHS communication system control flow for operating the system according to the present invention. It is explanatory drawing which shows the detection state of the person's pulse wave (heartbeat) on the bed by an ultrasonic vibration detection sensor. FIG. 8 shows the detection waveform of each detector when the subject is at rest in the test of FIG. 7, (a) is an ultrasonic vibration detection sensor, (b) is an electrocardiograph (heart rate monitor), and (c) is It shows the output waveform of the pulse wave meter. An example of the vibration detection signal (sampling interval 20 ms) from an ultrasonic vibration detection sensor is shown. It is drawing which shows the upper limit envelope line U and the lower limit envelope line D of 0.1s interval sampling by the microcomputer for control of an ultrasonic vibration detection sensor from the sampling data of 20 ms interval. It is drawing which shows the calculated value of _PW value (PP average) of 0.1 s interval calculated based on FIG. 12 shows a waveform obtained by resampling the P _W value (PP average) at intervals of 0.1 s in FIG. 11 into data every 20 mse. It is a diagram which shows the result of having smoothed the resampling data of FIG. 12 by the moving average for every 15 points. It is a diagram which shows the result of having performed the digital filter process on the data of FIG. It shows the attenuation characteristics of the filter used for the digital filter processing. It is a diagram which shows the extraction state of the peak point P based on FIG. (A) shows the original waveform of the 20 ms sampling of the ultrasonic vibration detection sensor and the heart rate waveform when the P _W value (P-P average) is 600 levels, and (b) shows the contrast of the heart rate. Is shown. It is a diagram which shows the relationship between the _PW value (PP average) level of the vibration detection data by an ultrasonic vibration detection sensor, and the error of a heart rate. It is explanatory drawing of the detection state of the pulse which concerns on 4th Example of this invention. 19A and 19B are diagrams showing the relationship between the pulse rate by the ultrasonic vibration detection sensor and the pulse rate by the electrocardiograph when the room temperature rises and the subject becomes sleepy (one subject AM1) And time transition at AM2). The difference between the detected pulse by the ultrasonic detection sensor and the detected pulse by the electrocardiograph when the PP value standard deviation is 50 or less is shown. It is explanatory drawing of the conventional person state determination apparatus. FIG. 21 is a configuration explanatory diagram of a conventional ultrasonic vibration detection sensor used in FIG. 20.

Explanation of symbols

S is the maximum value of the reflected waveform S ₁ is the time-series data S ₂ of the waveform S is the analysis data a of the time-series data S ₁ is the transmission signal a _o is the transmission pulse b is the reception signal _bo is the reception permission pulse e is the reception signal The intensity signal f is the received gain control signal t ₁ · t ₂ is the sampling time X _O is the sampling vibration data X _{1 at} every time t ₁ , the sampling vibration data U is every time t _{2, the} upper envelope line D is the lower envelope line R Is the resampling data P is the peak point T is the smoothed amplitude value Td is the digital filter data X is the original waveform (vibration data) of the ultrasonic vibration detection sensor
Y is the original waveform of the heart rate monitor Xa is the heart rate detected by the ultrasonic vibration sensor Ya is the heart rate Xa ₁ of the heart rate monitor is the detected heart rate Xa ₂ when the level is 800, and the detected heart rate Xa ₃ when the level is 600 The detected heart rate P _W at level 350 is the amplitude difference (P−P average value)
M is an average value of peak-to-peak time E is a control signal 1 to the environmental control device 1 is a personal computer 2 is a data communication base station 3 is a LAN line 4 is a PHS module or a PHS modem 5 is an ultrasonic vibration detection sensor 5a is a container body 5b The ultrasonic transducer 5c has a liquid surface 5d that is liquid (water).
Reference numeral 5e denotes a sensor body 5f, a control unit 6, a PHS line 7, an environmental control device 8, a cable 9, an ultrasonic transmitter / receiver 10, a control microcomputer (a microcomputer for an ultrasonic vibration detection sensor).
11 is bed 12 is subject 13 is heart rate monitor (electrocardiograph)
14 is a pulse wave meter 15 is an AD converter 16 is an electrode 17 is a pulse wave detection sensor 18 is a cable

Claims (7)

A sensor main body (5e) attached to the bed (11) and a control unit (5f) comprising an ultrasonic transmitter / receiver (9) and a control myco (10) are provided. In the control unit (5f), a constant time interval ( Vibration data (Xo) is obtained by sampling every t ₁ ), and vibration data (X ₁ ) obtained by sampling every time (t ₂ ) longer than the time (t ₁ ) from the vibration data (X _O ). An ultrasonic vibration detection sensor (5) for calculating an upper envelope line (U) and a lower envelope line (D) and outputting an amplitude difference (P _w ) between the two, and calculation from the ultrasonic vibration detection sensor (5) A PHS module or PHS modem (4) that outputs the amplitude difference (P _W ), a data communication base station (2) that communicates with the PHS module or PHS modem (4), and the data communication base station (2 ) Are connected via the AN (3), the PHS module or PHS modem (4) the time entered via the (t ₂₎ the amplitude difference for each (P _W) of the linear approximation the time (t ₁₎ for each of the with resampling the vibration data, the resampled data (R) from _{F (n) = a O +} a 1 + a 2 + a n-1 / n ( where, n is a suitable number of points, a _O to a _n are each After smoothing the amplitude data by a moving average for each of n points by the amplitude value at the point), the smoothed amplitude data (T) is subjected to a product-sum operation digital filter corresponding to a bandpass filter of 0 Hz to 10 Hz. The average time (M) of the time between each peak point (P) in 10 seconds is calculated from the data (Td) on which the digital filter is executed, and the heart rate is calculated from the average time (M). (Xa) the Xa = 60 / M (times / min) as a detector of biometric information using a computer (1) for calculating the ultrasonic vibration detecting sensor, characterized in that consisted. The biological information detection device according to claim 1, wherein the ultrasonic vibration detection sensor (5) has a sampling time (t ₁ ) of 20 ms and a sampling time (t ₂ ) of 0.1 s.   The biological information detection device according to claim 1, wherein the point n is set to 15 and the frequency of the bandpass filter is set to 0.5 Hz to 1.8 Hz.   The biological information detection device according to claim 1, wherein the number of points n is set to 11, and the frequency of the bandpass filter is set to 0.9 Hz to 2.0 Hz.   While detecting the heart rate or pulse rate of a person sleeping on the bed (11) using the biological information detecting device of claim 1, the detected value of the heart rate or pulse rate can be 80 times / minute or more. For example, a biological signal is transmitted from the computer (1) of the biological information detecting device to the environmental control device (7), and the indoor environmental conditions are adjusted by the control signal via the environmental control device (7). Indoor environment control method using information. A sensor main body (5e) attached to the bed (11) and a control unit (5f) comprising an ultrasonic transmitter / receiver (9) and a control myco (10) are provided. In the control unit (5f), a constant time interval ( The vibration data (Xo) is obtained by sampling every t ₁ ), and the upper envelope of the vibration data (X ₁ ) every time (t ₂ ) longer than the time (t ₁ ) from the vibration data (X _O ). (U) and the lower envelope line (D) and an ultrasonic vibration detection sensor (5) that outputs an amplitude difference (P _w ) between the two and the calculated amplitude from the ultrasonic vibration detection sensor (5) A PHS module or PHS modem (4) that outputs a difference (P _W ), a data communication base station (2) that communicates with the PHS module or PHS modem (4), and a LAN to the data communication base station (2) Via (3) Connected, with resampling the vibration data of the PHS module or PHS modem (4) the time entered via (t ₂₎ the amplitude difference for each (P _W) of the linear approximation the time (t ₁₎ for each , the resampling data (R) from _{F (n) = a O +} a 1 + a 2 + a n-1 / n ( where, n is a suitable number of points, a _O to a _n is the amplitude value at each point) by n After the amplitude data is smoothed by a moving average for each point, the smoothed amplitude data (T) is subjected to a digital filter by a product-sum operation corresponding to a bandpass filter of 0 Hz to 10 Hz, and the digital filter The average time (M) of the time between each peak point (P) in 10 seconds is calculated from the data (Td) performed, and the heart rate (Xa) is calculated from the average time (M) as Xa = It is calculated as 0 / M (times / min), and when the calculated heart rate (Xa) exceeds 80 times / min, a computer (1) that transmits an environmental control signal (E) and the LAN (3) And an environment control device (7) connected to the computer (1) and adjusting the operation of the environment device by an environment control signal (E). In the ultrasonic vibration detection sensor (5), the sampling time (t ₁ ) is set to 20 ms, the sampling time (t ₂ ) is set to 0.1 s, the number of points n is set to 11, and the frequency of the bandpass filter is set to 0.9 Hz to 2. The indoor environment control apparatus using the biological information according to claim 6, which is set to 0 Hz.

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