JP6920982B2 - Signal processor and program - Google Patents

Description

The present invention relates to a signal processing device and a program.

Technology related to a device for acquiring the state of a vehicle occupant by a plurality of biosensors has been developed. Examples of the above-mentioned technique of using a plurality of Doppler sensors having different irradiation directions as a biological sensor include the technique described in Patent Document 1.

Japanese Unexamined Patent Publication No. 2016-101342

Various methods such as a radio wave type, a photoelectric capacitance pulse wave type, an electrocardiographic type, and an imaging type are used as a method of a sensor (hereinafter, simply referred to as a “sensor”) for detecting the heartbeat or pulse of the living body to be detected. Can be mentioned. The heartbeat is the beat of the heart, and the pulse is the beat transmitted to the arteries by the beat of the heart. In the following, heartbeat and pulse are collectively referred to as “beat”. The pulse wave is a change in the volume of blood vessels that occurs when the heart of a living body beats.

In a sensor as described above, a pulsating waveform corresponding to the sensor, such as an electrocardiogram waveform (sometimes called "ECG (Electrocardiogram)") or a pulse wave waveform, is detected. Further, from the pulsation waveform, for example, the pulsation interval (hereinafter referred to as "RRI (R R Interval)") and the number of pulsations can be obtained. RRI is obtained by detecting the interval between peak positions from the beat waveform. The number of beats is obtained by calculating from RRI. In the following, the RRI and the number of beats obtained from the beat waveform are collectively referred to as "index related to beat".

The pulsation index obtained from the pulsation waveform can be used in various health care applications such as estimation of fatigue state, estimation of stress level, and estimation of sleep state. However, when the above-mentioned sensor is used, it is assumed that noise is superimposed on the pulsation waveform due to various external factors. Then, when noise is superimposed on the pulsation waveform, it may not be possible to obtain an accurate pulsation index from the pulsation waveform. Here, in the existing technology such as the technology described in Patent Document 1, the possibility that noise is superimposed on the pulsation waveform as described above is not taken into consideration.

The present invention has been made in view of the above problems, and an object of the present invention is a novel and improved method capable of more accurately determining whether or not a pulsation is normally detected by a sensor. The purpose is to provide a signal processing device and a program.

In order to achieve the above object, according to the first aspect of the present invention, the pulsation is normally detected by the above sensors based on the detection results of a plurality of sensors that detect the pulsations at different positions in the detection target. A determination unit for determining whether or not the pulsation is performed is provided, and the determination unit determines whether or not the pulsation is normally detected by comparing a plurality of pulsation numbers corresponding to the detection results of each of the plurality of sensors. The determination of 1 and the second determination of determining whether or not the pulsation is normally detected based on the amount of pulsation deviation corresponding to the detection results of each of the plurality of sensors are performed, and the determination of the first determination is performed. A signal processing device for determining whether or not a pulsation is normally detected by the sensor is provided based on a combination of the determination result and the determination result of the second determination.

In such a configuration, it is determined whether or not the pulsation is normally detected by the sensor based on the combination of the results of the determinations from different viewpoints of the first determination and the second determination. Therefore, with such a configuration, it is possible to more reliably determine whether or not the pulsation is normally detected by the sensor than to determine whether or not the pulsation is normally detected from one viewpoint. Therefore, with such a configuration, it is possible to more accurately determine whether or not the pulsation is normally detected by the sensor.

Further, when the determination unit indicates that both the determination result of the first determination and the determination result of the second determination indicate that the pulsation is normally detected, the plurality of sensors are normally used. It may be determined that the pulsation has been detected.

Further, when one of the determination result of the first determination and the determination result of the second determination does not indicate that the pulsation is normally detected, the determination unit may use the plurality of sensors. It is not necessary to determine that the pulsation is normally detected.

Further, when performing the first determination, the determination unit compares a plurality of the above-mentioned beat numbers and determines whether or not the plurality of the above-mentioned beat numbers match, and the plurality of the above-mentioned beat numbers match. If it is determined that the pulsation is normally performed, it may be determined that the pulsation is normally detected.

Further, when performing the second determination, the determination unit determines whether the pulsation deviation amount is within a predetermined range, and determines that the pulsation deviation amount is within a predetermined range. If this is the case, it may be determined that the pulsation is normally detected.

In addition, the determination unit may further perform a third determination for determining whether or not the plurality of beats are within a predetermined range.

Further, when the determination unit does not determine that the plurality of beats are within a predetermined range as a result of performing the third determination, the determination unit does not perform the first determination and the second determination. When it is determined that the plurality of beats are within a predetermined range as a result of performing the third determination, the first determination and the second determination may be performed.

Further, when the determination unit does not determine that the plurality of beats are within a predetermined range as a result of performing the third determination, the determination unit does not perform processing based on the detection results of the plurality of sensors. You may.

Further, in order to achieve the above object, according to the second aspect of the present invention, the pulsation is normally performed in the sensor based on the detection results of a plurality of sensors that detect the pulsation at different positions in the detection target. The step of determining whether or not is detected is executed by a computer, and in the above-mentioned determination step, the pulsation is normally detected by comparing a plurality of pulsation numbers corresponding to the detection results of each of the plurality of sensors. A first determination for determining whether or not the pulsation is performed and a second determination for determining whether or not the pulsation is normally detected based on the amount of pulsation deviation corresponding to the detection results of each of the plurality of sensors are performed. , A program is provided in which it is determined whether or not the pulsation is normally detected by the sensor based on the combination of the determination result of the first determination and the determination result of the second determination.

In such a program, it is determined whether or not the pulsation is normally detected by the sensor based on the combination of the results of the determinations from different viewpoints of the first determination and the second determination. Therefore, such a program can more accurately determine whether or not the sensor normally detects the pulsation.

According to the present invention, it is possible to more accurately determine whether or not the pulsation is normally detected by the sensor.

It is explanatory drawing for demonstrating an example in the case where the index about an accurate pulsation cannot be obtained from a pulsation waveform. It is explanatory drawing which shows an example of the structure of the signal processing system which concerns on embodiment of this invention. It is explanatory drawing for demonstrating an example of the process which concerns on the determination in the determination part provided in the signal processing apparatus which concerns on embodiment of this invention. It is a flow chart which shows an example of the processing in the determination part provided in the signal processing apparatus which concerns on embodiment of this invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals, so that duplicate description will be omitted.

[1] Signal processing system according to the embodiment of the present invention [1-1] Outline of the signal processing system according to the embodiment of the present invention As described above, there are various cases where a sensor for detecting the beat of the detection target is used. It is assumed that noise is superimposed on the beat waveform due to various external factors. Taking the case where the sensor is mounted on an automobile as an example, examples of external factors include the driving behavior of the driver to be detected and the road environment. To give a specific example, when a vehicle equipped with a sensor travels on a highway, the periodic vibration (for example, vibration having a period of about 1 [s]) that can be generated by the elevated connection portion of the highway is beaten. It becomes noise that affects the waveform of.

Further, as described above, when noise is superimposed on the pulsation waveform, it may not be possible to obtain an accurate pulsation index from the pulsation waveform.

FIG. 1 is an explanatory diagram for explaining an example in which an accurate index related to the pulsation cannot be obtained from the pulsation waveform, and is a beat detected by a Doppler sensor that detects the pulsation using radio waves. An example of a dynamic waveform is shown. FIG. 1A shows an example of a pulsating waveform in which noise due to an extrinsic factor is not superimposed. B in FIG. 1 shows an example of the pulsation waveform when noise due to an extrinsic factor is superimposed on the pulsation waveform shown in A in FIG. P1 and P2 shown in A of FIG. 1 indicate peak positions in the pulsation waveform shown in A of FIG. 1, and P1', P2'and P3'shown in B of FIG. 1 are shown in B of FIG. The peak position in the pulsation waveform shown is shown.

As described above, RRI is obtained by detecting the interval between peak positions from the beat waveform. For the peak position of the pulsation waveform, for example, "the section from when the signal indicating the waveform exceeds the set threshold value to when the signal indicating the waveform falls below the threshold value" is detected from the signal indicating the waveform. It is identified by detecting the maximum value in the section. Needless to say, the method of specifying the peak position of the pulsation waveform is not limited to the example shown above.

Further, the number of beats in a predetermined period can be calculated by the following mathematical formula 1 using, for example, RRI. Here, the following formula 1 shows an example of a calculation for calculating the number of beats in one minute (an example of a predetermined period). That is, the unit of the number of beats calculated by the following mathematical formula 1 is "[Beats per Minute]". Further, in the following mathematical formula 1, RRI is represented by "[sec]". The predetermined period according to the embodiment of the present invention is not limited to one minute, and may be any period.

Number of beats = 1 / RRI x 60
... (Formula 1)

As shown in FIG. 1, when noise is superimposed on the pulsation waveform, the peak position detected from the pulsation waveform changes. That is, the index related to the beat obtained from the waveform of the beat shown in FIG. 1A and the index related to the beat obtained from the waveform of the beat shown in FIG. 1B may be different from each other. Therefore, when noise is superimposed on the pulsation waveform, it is not always possible to obtain an accurate pulsation index from the pulsation waveform.

Therefore, the signal processing system according to the embodiment of the present invention has a plurality of sensors and a signal processing device, and the signal processing device normally detects the beat in the sensor based on the detection results of the plurality of sensors. Determine if it is.

Each of the plurality of sensors is a sensor that detects the pulsation of different positions in the detection target. Examples of the plurality of sensors include a heartbeat sensor that detects a signal indicating a heartbeat using the potential differences of a plurality of electrodes, a Doppler sensor, and a pulse wave that optically detects a pulse wave using a method called photoelectric capacitance pulse wave. It is possible to detect pulsations, such as sensors, image sensors that detect pulsations using captured images, and TOF (Time Of Flight) sensors that detect pulsations using light such as infrared light. Any type of sensor can be mentioned.

Further, the plurality of sensors may be the same type of sensor that detects the pulsation of the detection target, or the plurality of sensors may include different types of sensors. When the same type of sensor is used as a plurality of sensors, the characteristics of each sensor are the same except for the variation of each sensor, so that the determination accuracy can be improved by using the detection results of the plurality of sensors. Further, when a plurality of sensors include different types of sensors, the pulsation of the detection target is detected from different viewpoints. Therefore, even in this case, the determination accuracy can be improved by using the detection results of the plurality of sensors. ..

More specifically, in the signal processing device according to the embodiment of the present invention, as shown in the first determination and the second determination described later, whether or not the pulsation is normally detected in each of a plurality of different viewpoints. Judge each. Then, the signal processing device according to the embodiment of the present invention determines whether or not the pulsation is normally detected by the sensor based on the combination of the determination results from different viewpoints. The signal processing device according to the embodiment of the present invention determines that the pulsation is normally detected by the sensor when all the results of the determinations from different viewpoints indicate that the pulsation is normally detected. .. Further, in the signal processing device according to the embodiment of the present invention, when the result of at least one of the determination results from different viewpoints does not indicate that the pulsation is normally detected, the sensor is used. It is not determined that the beat is detected normally.

As described above, it is determined whether the pulsation is normally detected from one viewpoint by determining whether the sensor normally detects the pulsation based on the combination of the judgment results from different viewpoints. It is possible to more reliably determine whether or not the pulsation is normally detected by the sensor.

Therefore, the signal processing system according to the embodiment of the present invention having the signal processing device according to the embodiment of the present invention can more accurately determine whether or not the pulsation is normally detected by the sensor.

Further, in the signal processing device according to the embodiment of the present invention, by determining whether or not the pulsation is normally detected by the sensor, for example, "the pulsation is normally detected as shown in B of FIG. It is possible to prevent the pulsation index obtained from the pulsation waveform in the non-existing state from being used in various applications related to healthcare.

[1-2] Configuration of Signal Processing System According to Embodiment of the Present Invention Next, while explaining the configuration of the signal processing system according to the embodiment of the present invention, the processing in the signal processing apparatus according to the embodiment of the present invention will be described. , Will be described more specifically.

In the following, a case where the signal processing system according to the embodiment of the present invention has two sensors will be given as an example. The number of sensors included in the signal processing system according to the embodiment of the present invention is not limited to two. The signal processing system according to the embodiment of the present invention may have three or more sensors. Even when the signal processing system according to the embodiment of the present invention has three or more sensors, the signal processing device according to the embodiment of the present invention is the same as when the signal processing system described later has two sensors. In addition, it is possible to determine whether or not the beat is normally detected by the sensor.

FIG. 2 is an explanatory diagram showing an example of the configuration of the signal processing system 1000 according to the embodiment of the present invention. The signal processing system 1000 includes sensors 100A and 100B and a signal processing device 200.

[1-2-1] Sensors 100A, 100B
Sensors 100A and 100B are sensors that detect beats at different positions in the detection target, respectively. Examples of the sensors 100A and 100B include, as described above, any type of sensor capable of detecting a beat, such as a heart rate sensor, a Doppler sensor, a pulse wave sensor, an image sensor, and a TOF sensor.

Different positions in the detection target according to the embodiment of the present invention include, for example, "different arbitrary parts in the detection target such as the heart and other parts, arms and thighs", and "different positions in the arms and thighs". , Different positions in the same site. Needless to say, the examples of different positions in the detection target are not limited to the examples shown above.

Further, the sensors 100A and 100B may be the same type of sensors or different types of sensors. In the following, a case where one of the sensors 100A and 100B is a heart rate sensor and the other sensor is a Doppler sensor (an example in which the sensors 100A and 100B are different types of sensors) will be given as an example.

Each of the sensors 100A and 100B outputs a signal indicating a pulsation waveform corresponding to the sensor as a pulsation detection result, as shown in FIG. 1, for example. An example of a signal indicating a pulsation waveform output from each of the sensors 100A and 100B will be described later.

Each of the sensors 100A and 100B is supplied by, for example, the electric power supplied from an internal power source such as a battery provided in each of the sensors 100A and 100B, or the electric power supplied from an external power source such as a power source included in the signal processing system 1000. Drive.

[1-2-2] Signal processing device 200
The signal processing device 200 is a device that determines whether or not the beat is normally detected in the sensors 100A and 100B by using the detection results of the sensors 100A and 100B (an example of a plurality of sensors; the same applies hereinafter). Is.

As described above, the signal processing device 200 determines whether or not the pulsation is normally detected from a plurality of different viewpoints, and the pulsation is normally detected by the sensor based on the combination of the determination results from the different viewpoints. Determine if it is done. An example of the processing related to the determination in the signal processing device 200 will be described later.

The signal processing device 200 includes, for example, a generation unit 202, a determination unit 204, and a processing unit 206.

The generation unit 202, the determination unit 204, and the processing unit 206 are composed of processors (not shown) such as a CPU (Central Processing Unit) and an MCU (Micro Controller Unit), for example. The generation unit 202, the determination unit 204, and the processing unit 206 may be composed of a plurality of processing circuits. Further, the processor (not shown) can play a role of controlling the entire signal processing device 200.

Further, the signal processing device 200 is, for example, a ROM (Read Only Memory, not shown), a RAM (Random Access Memory, not shown), or an operation unit (not shown) that can be operated by a user of the signal processing device 200. ), A display unit (not shown) that displays various screens on the display screen, a communication unit (not shown) for performing wireless communication or wired communication with an external device, and the like may be provided. The signal processing device 200 connects each of the above components by, for example, a bus as a data transmission path.

The ROM (not shown) stores data such as programs and arithmetic parameters used by a processor (not shown), for example. The RAM (not shown) temporarily stores, for example, a program executed by a processor (not shown), processing data, and the like.

Examples of the operation unit (not shown) include any operation device such as a button, a direction key, or a combination thereof.

Examples of the display unit (not shown) include any display device such as a liquid crystal display or an organic EL display. The display on the display unit (not shown) is controlled by, for example, a processor (not shown).

The communication unit (not shown) includes, for example, a communication antenna and an RF (Radio Frequency) circuit (wireless communication), an IEEE802.5.1 port and a transmission / reception circuit (wireless communication), an IEEE802.11 port and a transmission / reception circuit (wireless). (Communication), or a communication device that supports any communication method such as a LAN terminal and a transmission / reception circuit (wired communication). The communication device constituting the communication unit (not shown) is, for example, a communication device compatible with an in-vehicle network such as CAN (Controller Area Network), LIN (Local Interconnect Network), FlexRay, and MOST (Media Oriented System Transport). It may be. Communication in the communication unit (not shown) is controlled by, for example, a processor (not shown).

The signal processing device 200 is driven by, for example, electric power supplied from an internal power source such as a battery included in the signal processing device 200, or electric power supplied from an external power source such as a power source included in the signal processing system 1000. ..

[1-2-2-1] Generation unit 202
The generation unit 202 generates pulsation information for each of the sensors 100A and 100B based on a signal indicating a pulsation waveform transmitted from each of the sensors 100A and 100B (an example of a signal indicating a detection result of the sensors 100A and 100B). Generate.

The pulsation information according to the embodiment of the present invention is data related to pulsation detected from a signal indicating a pulsation waveform. The pulsation information includes, for example, the number of pulsations and the detection time of pulsations.

The data included in the pulsation information is not limited to the example shown above. For example, the pulsation information may include data corresponding to any index that can be detected from a signal indicating the pulsation waveform, such as RRI. Further, the pulsation information may include data indicating the sensors 100A and 100B (for example, IDs of the sensors 100A and 100B, data indicating the type of the sensor, and the like).

The generation unit 202 is based on, for example, a first generation unit 208A that generates pulsation information based on a signal indicating a pulsation waveform transmitted from the sensor 100A, and a signal indicating a pulsation waveform transmitted from the sensor 100B. It has a second generation unit 208B that generates pulsation information. The first generation unit 208A and the second generation unit 208B start generating pulsation information in synchronization with each other.

The first generation unit 208A has, for example, a filter unit 210A and a generation processing unit 212A.

The filter unit 210A filters the signal indicating the pulsation waveform transmitted from the sensor 100A, and removes the frequency component other than the frequency component corresponding to the pulsation from the signal indicating the pulsation waveform. Examples of the filter unit 210A include "a bandpass filter that passes only frequency components corresponding to beats such as 0.8 [Hz] to 1.2 [Hz] and does not pass other frequency components". Be done. The filter constituting the filter unit 210A is not limited to the bandpass filter, and may be any filter capable of attenuating frequency components other than the frequency component corresponding to the pulsation.

The generation processing unit 212A generates pulsation information based on the signal indicating the pulsation waveform filtered by the filter unit 210A, and outputs the generated pulsation information.

For example, the generation processing unit 212A detects the peak position from the signal indicating the filtered pulsation waveform, and acquires the RRI from the signal indicating the filtered pulsation waveform. Then, the generation processing unit 212A calculates the number of beats by the above formula 1.

Further, the generation processing unit 212A specifies, for example, the pulsation detection time from the signal showing the filtered pulsation waveform. The generation processing unit 212A specifies, for example, the time when the generation of the pulsation information is started as the reference time, and the time when the peak position is detected as the pulsation detection time. As described above, since the first generation unit 208A and the second generation unit 208B start the generation of the pulsation information in synchronization with each other, the reference times in the generation processing unit 212A and the second generation unit 208B are the same. It will be.

Then, the generation processing unit 212A outputs pulsation information including the number of pulsations and the detection time of pulsations. As described above, the pulsation information output by the generation processing unit 212A may include an RRI, an ID indicating the sensor 100A, and the like.

The second generation unit 208B has, for example, a filter unit 210B and a generation processing unit 212B.

The filter unit 210B filters the signal indicating the pulsation waveform transmitted from the sensor 100B, and removes the frequency component other than the frequency component corresponding to the pulsation from the signal indicating the pulsation waveform. Examples of the filter unit 210B include a bandpass filter and the like, similarly to the filter unit 210A. The filter constituting the filter unit 210B may be the same type of filter as the filter unit 210A, or may be a different type of filter.

Similar to the generation processing unit 212A, the generation processing unit 212B generates pulsation information based on the signal indicating the pulsation waveform filtered by the filter unit 210B, and outputs the generated pulsation information.

The generation unit 202 generates pulsation information for each of the sensors 100A and 100B, for example, by having the first generation unit 208A and the second generation unit 208B.

[1-2-2-2] Judgment unit 204
The determination unit 204 serves to perform processing related to the determination. The determination unit 204 determines whether or not the pulsation is normally detected from a plurality of different viewpoints, and determines whether or not the pulsation is normally detected by the sensor based on the combination of the determination results from the different viewpoints. ..

FIG. 3 is an explanatory diagram for explaining an example of processing related to determination in the determination unit 204 included in the signal processing device 200 according to the embodiment of the present invention. A in FIG. 3 shows a driver which is an example of the detection target of the sensors 100A and 100B. FIG. 3B shows an example of the beat waveform of the driver's heart detected by the heart rate sensor (one of the sensors 100A and 100B). FIG. 3C shows an example of the beat waveform of the driver's thigh detected by the Doppler sensor (the other of the sensors 100A and 100B). Hereinafter, an example of the process related to the determination in the determination unit 204 will be described with reference to FIG. 3 as appropriate.

More specifically, the determination unit 204 makes the first determination shown in (A) below and the second determination shown in (B) below, respectively.

(A) First determination The determination unit 204 determines whether or not the pulsation is normally detected by comparing a plurality of pulsation numbers corresponding to the detection results of the sensors 100A and 100B, respectively.

As described above, the beats detected by the sensors 100A and 100B may include a heartbeat and a pulse. Here, the heartbeat is the beating of the heart. The pulse is the beat of blood vessels caused by the pumping of blood from the heart by the beat of the heart. Therefore, even if the sensors 100A and 100B detect the pulsations at different positions in the detection target, if the pulsations are normally detected by the sensors 100A and 100B, the number of pulsations will be (variation of individual sensors). It should basically match (except for errors that can occur due to, etc.).

That is, the first determination is a determination for determining whether or not the pulsation is normally detected by utilizing the fact that the pulsations at different positions in the detection target match.

The determination unit 204 compares a plurality of beats and determines whether the plurality of beats match. In the determination unit 204, for example, when the number of pulsations indicated by the pulsation information corresponding to the sensor 100A and the number of pulsations indicated by the pulsation information corresponding to the sensor 100B are the same, the plurality of pulsation numbers are one. Judge that you are doing it. Further, in the determination unit 204, for example, "an absolute value of the difference between the number of beats indicated by the beat information corresponding to the sensor 100A and the number of beats indicated by the beat information corresponding to the sensor 100B" is set. When it is equal to or less than the threshold value according to the first determination, or when the absolute value is smaller than the threshold value according to the first determination, it may be determined that a plurality of beat numbers match.

When making the first determination, the determination unit 204 determines that the pulsations are normally detected when it is determined that the plurality of pulsations match. Further, the determination unit 204 does not determine that the pulsations are normally detected when it is not determined that the plurality of pulsations match.

(B) The second determination determination unit 204 determines whether or not the pulsation is normally detected based on the amount of pulsation deviation corresponding to the detection results of the sensors 100A and 100B, respectively.

As described above, the beats detected by the sensors 100A and 100B may include a heartbeat and a pulse. Further, as described above, the heartbeat is the pulsation of the heart, and the pulse is the pulsation of blood vessels generated by pumping blood from the heart by the pulsation of the heart. Therefore, for example, there is a difference in the timing at which the beat is detected between the heartbeat and the pulse, and the pulse at different positions of the detection target.

That is, the second determination is a determination for determining whether or not the pulsation is normally detected by utilizing the fact that the timing at which the pulsation at different positions in the detection target is detected is deviated.

The determination unit 204 identifies the amount of pulsation deviation based on the pulsation detection time indicated by the pulsation information. The determination unit 204 identifies the amount of pulsation deviation by, for example, obtaining "the difference in the detection times of the corresponding pulsations between the sensor 100A and the sensor 100B". Examples of the corresponding pulsation detection time include, for example, "the time when the peak position P1 shown in FIG. 3 is detected and the time when the peak position P1'shown in FIG. 3 is detected" and "the peak shown in FIG. The time point when the position P2 is detected and the time point when the peak position P1'shown in FIG. 3 is detected ”, ... That is, each of the "deviation amounts" shown in FIG. 3 corresponds to an example of the pulsation deviation amount. The corresponding pulsation detection time can be specified, for example, by arranging the pulsation detection times recorded in the pulsation information in order of proximity to the reference time.

The determination unit 204 determines whether the amount of pulsation deviation is within a predetermined range. The data indicating the predetermined range according to the second determination is stored in a recording medium such as a ROM (not shown), for example. As the data indicating the predetermined range related to the second determination, for example, "a table (or database. The same shall apply hereinafter) in which IDs of a plurality of sensors and a predetermined range related to the second determination are associated with each other. ”,“ A table (or database; the same shall apply hereinafter) in which a part to be detected by a plurality of sensors and a predetermined range related to the second determination are associated with each other. ” Can be mentioned. Examples of the sites to be detected by the plurality of sensors include different sites and one or both of the same sites. The predetermined range recorded in the data indicating the predetermined range is experimentally determined, for example, by measuring the deviation of the pulsation of the subject.

When the data indicating the predetermined range related to the second determination is "a table in which the IDs of a plurality of sensors and the predetermined range related to the second determination are associated", the determination unit 204 may, for example, A predetermined range according to the second determination is specified based on the ID indicating the sensor included in the pulsation information. Further, when the data indicating the predetermined range related to the second determination is "a table in which the parts to be detected by a plurality of sensors and the predetermined range related to the second determination are associated with each other", the determination is made. The unit 204 specifies a predetermined range according to the second determination, for example, based on a portion designated by the operation of the operation unit (not shown). Needless to say, the method for specifying the predetermined range according to the second determination in the determination unit 204 is not limited to the example shown above.

The determination unit 204 determines that the pulsation is normally detected when it is determined that the amount of deviation of the pulsation is within a predetermined range. Further, the determination unit 204 does not determine that the pulsation is normally detected when it is not determined that the pulsation deviation amount is within the predetermined range. The amount of pulsation deviation within a predetermined range includes, for example, one or both of the case where the amount of pulsation deviation is at the lower limit value and the case where the amount of pulsation deviation is at the upper limit value. It may or may not include these cases.

When the first determination shown in the above (A) and the second determination shown in the above (B) are performed, the determination unit 204 normally performs the first determination and the second determination from a plurality of different viewpoints. It is determined whether or not the beat is detected. Then, the determination unit 204 determines whether or not the pulsation is normally detected in the sensors 100A and 100B based on the combination of the result of the first determination and the result of the second determination.

The determination unit 204 normally detects the pulsation in the sensors 100A and 100B when both the determination result of the first determination and the determination result of the second determination indicate that the pulsation is normally detected. It is determined that it has been done. Further, when one of the determination result of the first determination and the determination result of the second determination does not indicate that the pulsation is normally detected, the determination unit 204 normally uses the sensors 100A and 100B. It is not determined that the beat is detected.

Then, the determination unit 204 outputs the determination information indicating the determination result to the processing unit 206. The determination unit 204 can also transmit determination information via a communication device that constitutes a communication unit (not shown) or an external communication device of the signal processing device 200.

Examples of the determination information according to the embodiment of the present invention include a flag indicating whether or not the pulsation is normally detected in the sensors 100A and 100B. The determination information is not limited to the above flag, and may be data of any format capable of showing the determination result of whether or not the pulsation is normally detected by the sensors 100A and 100B.

The determination information output from the determination unit 204 states that "the sensors 100A and 100B normally beat according to a plurality of different viewpoints of the first determination shown in (A) above and the second determination shown in (B) above. It is the result of determining whether or not it has been detected. Therefore, the determination unit 204 can more reliably determine whether or not the pulsation is normally detected by the sensor than when determining whether or not the pulsation is normally detected from each viewpoint.

To give a specific example that can be determined more reliably, when periodic vibration is generated by the above-mentioned elevated connection portion of the expressway, the vibration is detected by both the sensors 100A and 100B at the same time. Therefore, the amount of deviation of the peak position generated in the pulsation waveform due to the periodic vibration becomes 0 (zero) or very small, and the determination unit 204 normally performs the second determination shown in the above (B). It is not determined that the beat is detected. As a result, the determination unit 204 does not determine that the pulsations are normally detected by the sensors 100A and 100B.

Therefore, the determination unit 204 can more accurately determine whether or not the pulsation is normally detected by the sensors 100A and 100B.

The processing in the determination unit 204 is not limited to the example shown above.

For example, the determination unit 204 may further perform the third determination shown in (C) below.

(C) Third determination The determination unit 204 determines whether the plurality of beats corresponding to the detection results of the sensors 100A and 100B are within a predetermined range.

For example, the determination unit 204 compares each of the plurality of beats with a predetermined range, and when all of the plurality of beats are within the predetermined range, the plurality of beats are within the predetermined range. Judge that there is. The number of beats within a predetermined range may include, for example, one or both cases where the number of beats is at the lower limit and the number of beats is at the upper limit. These cases may not be included.

Since the detection target of each of the sensors 100A and 100B is a living body such as a driver, the number of beats can change depending on the state of the detection target such as the physical condition and mental state of the detection target. Further, when the state of the detection target is a normal state, it is assumed that the number of beats is within a certain range.

That is, the third determination is a determination to determine whether the state of the detection target is a normal state by using the number of beats corresponding to the detection results of the sensors 100A and 100B respectively.

The predetermined range according to the third determination is, for example, the number of beats of a subject who self-reports that the condition is normal, or the beat of a subject estimated to be in a normal state by a diagnosis by a doctor or the like. It is determined experimentally by measuring the number. To give an example of a predetermined range according to the third determination, examples of the predetermined range according to the third determination include 60 [Beats per Minute] to 100 [Beats per Minute]. Needless to say, the example of the predetermined range according to the third determination is not limited to the example shown above.

The data indicating the predetermined range according to the third determination is stored in a recording medium such as a ROM (not shown), and the determination unit 204 uses the data indicating the predetermined range according to the third determination. Therefore, it is determined whether or not the number of beats corresponding to the detection results of the sensors 100A and 100B is within a predetermined range. As the data indicating the predetermined range related to the third determination, for example, "a table (or database. The same shall apply hereinafter) in which IDs of a plurality of sensors and a predetermined range related to the third determination are associated with each other. ) ”,“ A table (or database; the same shall apply hereinafter) in which a part to be detected by a plurality of sensors and a predetermined range related to the third determination are associated with each other. Can be mentioned.

When the data indicating the predetermined range related to the third determination is "a table in which the IDs of a plurality of sensors and the predetermined range related to the third determination are associated", the determination unit 204 may, for example, A predetermined range according to the third determination is specified based on the ID indicating the sensor included in the pulsation information. Further, when the data indicating the predetermined range related to the third determination is "a table in which the part to be detected by a plurality of sensors and the predetermined range related to the third determination are associated with each other", the determination is made. The unit 204 specifies a predetermined range according to the third determination, for example, based on a portion designated by the operation of the operation unit (not shown). Needless to say, the method for specifying the predetermined range according to the third determination in the determination unit 204 is not limited to the example shown above.

As described above, the third determination corresponds to the determination of determining whether the state of the detection target is a normal state. When making a third determination, the determination unit 204 uses, for example, one of the processes shown in (C-1) below and the process shown in (C-2) below, or one of the processes shown in (C-2) below, using the result of the third determination. Do both.

(C-1) First example of processing using the result of the third determination: Processing related to execution control of the first determination and the second determination The determination unit 204 is based on the result of the third determination. , Controls the execution of the first determination shown in (A) above and the second determination shown in (B) above.

If it is not determined that the plurality of beats are within a predetermined range, the determination unit 204 does not perform the first determination and the second determination. Further, the determination unit 204 makes a first determination and a second determination when it is determined that the plurality of beats are within a predetermined range. That is, the determination unit 204 makes the first determination and the second determination when it is determined that the state of the detection target is a normal state.

As described above, by selectively executing the first determination and the second determination based on the result of the third determination, for example, the processing load in the signal processing device 200 can be reduced, and the signal processing device 200 can be used. The effect such as reduction of power consumption is achieved.

When the first determination and the second determination are not performed, the determination unit 204 does not have to output the determination information to the processing unit 206, and the sensors 100A and 100B do not normally detect the pulsation. The indicated determination information may be output to the processing unit 206.

(C-2) Second example of processing using the result of the third determination: Processing related to execution control of processing based on the detection results of a plurality of sensors The determination unit 204 is based on the result of the third determination. , Controls the execution of processing based on the detection results of the sensors 100A and 100B. The processing based on the detection results of the sensors 100A and 100B corresponds to the processing according to the application related to health care using the index related to pulsation.

If it is not determined that the plurality of beats are within a predetermined range, the determination unit 204 does not cause the processing unit 206 to perform processing based on the detection results of the sensors 100A and 100B. When it is not determined that the plurality of beats are within a predetermined range, the determination unit 204 provides, for example, control information (data) including a control command for limiting the execution of processing based on the detection results of the sensors 100A and 100B. By transmitting to the processing unit 206, the execution of processing based on the detection results of the sensors 100A and 100B in the processing unit 206 is restricted.

The determination unit 204 transmits the control information via a communication device constituting a communication unit (not shown) or an external communication device of the signal processing device 200, thereby causing a sensor in the external processing device. It is also possible to limit the execution of processing based on the detection results of 100A and 100B.

Here, the process using the result of the third determination according to the second example can be performed by the processing unit 206 or an external processing device. As described above, when the execution of the process based on the detection result of the sensors 100A and 100B is controlled based on the result of the third determination, the processing load in the processing unit 206 is reduced or the processing in the external processing device is performed. Effects such as load reduction are achieved.

FIG. 4 is a flow chart showing an example of processing in the determination unit 204 included in the signal processing device 200 according to the embodiment of the present invention. The process of step S100 shown in FIG. 4 corresponds to the process related to the third determination shown in (C) above, and FIG. 4 shows that the determination unit 204 relates to the first example shown in (C-1) above. An example of performing a process using the result of the third determination is shown. Further, the process of step S102 shown in FIG. 4 corresponds to the process related to the first determination shown in (A) above, and the process of step S106 shown in FIG. 4 corresponds to the second determination shown in (B) above. Corresponds to such processing.

The determination unit 204 determines whether or not the number of beats based on the detection results of the sensors 100A and 100B is within the normal range (S100). The determination unit 204 refers to, for example, data indicating a predetermined range related to the third determination, and compares the predetermined range related to the third determination with the number of beats corresponding to the sensors 100A and 100B, respectively. Step S100 is determined accordingly.

If it is not determined in step S100 that the number of beats is within the normal range, the determination unit 204 ends the process shown in FIG.

Further, when it is determined in step S100 that the number of beats is within the normal range, the determination unit 204 determines whether or not the number of beats matches between the sensors 100A and 100B (S102). As described above, the determination unit 204 determines that, for example, when the number of beats corresponding to the sensor 100A and the number of beats corresponding to the sensor 100B are the same, the plurality of beats are the same. .. Further, in the determination unit 204, for example, when "the absolute value of the difference between the number of beats corresponding to the sensor 100A and the number of beats corresponding to the sensor 100B" is equal to or less than the set threshold value for the first determination. (Or, when the absolute value is smaller than the threshold value related to the first determination), it may be determined that a plurality of beat numbers match.

If it is not determined in step S102 that the pulsations match between the sensors 100A and 100B, the determination unit 204 does not determine that the pulsations are normally detected in the sensors 100A and 100B (S104). Then, the determination unit 204 ends the process shown in FIG.

Further, when it is determined in step S102 that the pulsation numbers match between the sensors 100A and 100B, the determination unit 204 determines that the amount of pulsation deviation corresponding to the detection results of the sensors 100A and 100B is within the normal range. It is determined whether or not there is (S106). The determination unit 204 refers to, for example, data indicating a predetermined range related to the second determination, and compares the predetermined range related to the second determination with the amount of pulsation deviation corresponding to the sensors 100A and 100B. As a result, the determination in step S106 is performed.

If it is not determined in step S106 that the amount of pulsation deviation is within the normal range, the determination unit 204 does not determine that the pulsations are normally detected by the sensors 100A and 100B (S104). Then, the determination unit 204 ends the process shown in FIG.

Further, when it is determined in step S106 that the amount of pulsation deviation is within the normal range, the determination unit 204 determines that the pulsation is normally detected by the sensors 100A and 100B (S108). Then, the determination unit 204 ends the process shown in FIG.

The determination unit 204 performs the process shown in FIG. 4, for example. Needless to say, the example of processing in the determination unit 204 is not limited to the example shown in FIG.

[1-2-2-3] Processing unit 206
The processing unit 206 serves to perform processing based on the detection results of the sensors 100A and 100B. The processing unit 206 performs processing based on the detection results of the sensors 100A and 100B based on the pulsation information.

As described above, the processing based on the detection results of the sensors 100A and 100B corresponds to the processing according to the application related to health care using the index related to pulsation. As an example, as the processing based on the detection results of the sensors 100A and 100B, the processing for estimating the fatigue state of the detection target, the processing for estimating the stress level, the processing for estimating the sleep state, and the number of beats indicated by the beat information. And the process of recording RRI and the like on a recording medium. The processing based on the detection results of the sensors 100A and 100B is not limited to the example shown above. The processing unit 206 may perform arbitrary processing using the number of beats indicated by the beat information, RRI, or the like.

The processing unit 206 performs processing based on the detection result of at least one of the sensors 100A and 100B, for example, based on the determination result of the determination unit 204.

For example, when the determination information transmitted from the determination unit 204 indicates that the pulsation is normally detected, the processing unit 206 corresponds to the processing based on the pulsation information corresponding to the sensor 100A or the sensor 100B. Performs processing based on pulsation information. Here, the case where the determination information indicates that the pulsation is normally detected means that "the content indicated by the pulsation information corresponding to the sensor 100A and the content indicated by the pulsation information corresponding to the sensor 100B are defined. When it can be considered that they match. "

Therefore, when the determination information indicates that the pulsation is normally detected, the processing unit 206 performs a process based on the pulsation information corresponding to the sensor 100A or a process based on the pulsation information corresponding to the sensor 100B. conduct. Needless to say, the processing unit 206 can perform processing based on the detection result of the sensor by using the pulsation information corresponding to the sensor 100A and the pulsation information corresponding to the sensor 100B.

Further, for example, when the determination information transmitted from the determination unit 204 does not indicate that the pulsation is normally detected, the processing unit 206 does not perform processing based on the detection results of the sensors 100A and 100B.

That is, the processing unit 206 selectively performs processing based on the detection result of at least one of the sensors 100A and 100B based on the determination result of the determination unit 204.

The processing in the processing unit 206 is not limited to the example shown above.

For example, when the process shown in (C-2) above (process using the result of the third determination according to the second example) is performed in the determination unit 204, the processing unit 206 is transmitted from the determination unit 204. It is not necessary to perform processing based on the detection results of the sensors 100A and 100B based on the control information.

The signal processing device 200 determines whether or not the pulsation is normally detected by the sensors 100A and 100B by having the configuration shown in FIG. 2, for example.

The configuration of the signal processing device 200 is not limited to the example shown in FIG.

For example, the functional block shown in FIG. 2 is obtained by dividing the functions of the signal processing device 200 for convenience, and the signal processing device 200 can have an arbitrary configuration according to the method of dividing the functions. As an example, in the signal processing device 200, the determination unit 204 may have the function of the generation unit 202.

Further, the signal processing device 200 may be configured not to include the processing unit 206 shown in FIG. 2, for example. Even when the processing unit 206 is not provided, the signal processing device 200 can determine whether or not the beat is normally detected by the sensors 100A and 100B.

Further, the signal processing device 200 may be configured to include one or both of the sensor 100A and the sensor 100B. When the signal processing device 200 is configured to include both the sensor 100A and the sensor 100B, the signal processing device 200 functions as the signal processing system 1000.

[2] An example of the effect produced by the signal processing system according to the embodiment of the present invention By using the signal processing system according to the embodiment of the present invention, for example, the following effects are exhibited. Needless to say, the effects produced by the signal processing system according to the embodiment of the present invention are not limited to the effects shown below.
-In the signal processing system according to the embodiment of the present invention, the signal processing device according to the embodiment of the present invention has a degree of coincidence of the number of beats corresponding to a plurality of sensors and a timing of beats among the plurality of sensors. It is determined whether or not the beating is normally detected by the sensor based on the amount of deviation (sliding time). Therefore, in the signal processing system according to the embodiment of the present invention, is the pulsation normally detected by the sensor even under noise conditions such as when periodic vibration is generated by the elevated connecting portion of the highway? Can be determined more accurately.

[3] Application Example of Signal Processing System According to Embodiment of the Present Invention The signal processing system according to the embodiment of the present invention has been described above. "Systems installed in arbitrary vehicles such as airplanes, ships, trains", "Systems installed in control rooms that control traffic systems", "Systems installed in control rooms that control power systems", "Homes" It can be applied to various systems such as "network system" in which a living body to be detected may exist.

Further, as a component of the signal processing system according to the embodiment of the present invention, the signal processing device according to the embodiment of the present invention is mentioned, but the signal processing device according to the embodiment of the present invention is described as "the above-described embodiment of the present invention. It can be applied to any device that constitutes the system to which the signal processing system according to the embodiment is applied. As described above, the signal processing device according to the embodiment of the present invention may include a plurality of sensors and function as the signal processing system according to the embodiment of the present invention.

As an example, when the signal processing system according to the embodiment of the present invention is applied to an automobile, the signal processing device according to the embodiment of the present invention includes, for example, an integrated ECU (Electronic Control Unit), a body ECU, and information. Computers such as system ECUs can be mentioned. When the signal processing system according to the embodiment of the present invention is applied to an automobile, for example, a plurality of ECUs included in the automobile may realize the function of the signal processing device according to the embodiment of the present invention.

[4] A program according to an embodiment of the present invention A program for causing a computer to function as a signal processor according to an embodiment of the present invention (for example, among the configurations of the signal processor 200 shown in FIG. 2, at least FIG. 2 shows. By executing the program (program for functioning as the determination unit 204) shown by a processor or the like in a computer, it is possible to determine whether or not the beat is normally detected by the sensor.

Further, when a program for causing the computer to function as the signal processing device according to the embodiment of the present invention is executed by the processor in the computer, the effect exerted by the signal processing system according to the embodiment of the present invention described above. However, it is played.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the claims, which naturally belong to the technical scope of the present invention. Understood.

For example, in the above, it has been shown that a program (computer program) for causing a computer to function as a signal processing device according to an embodiment of the present invention is provided, but the embodiment of the present invention further provides the above program. A stored recording medium can also be provided.

100A, 100B Sensor 200 Signal processing device 202 Generation unit 204 Judgment unit 206 Processing unit 208A 1st generation unit 208B 2nd generation unit 210A, 210B Filter unit 212A, 212B Generation processing unit 1000 Signal processing system

Claims (9)

A determination unit for determining whether or not the pulsation is normally detected by the sensor based on the detection results of a plurality of sensors that detect the pulsation at different positions in the detection target is provided.
The determination unit
First and determining determines normal beats are detected by comparing the number of the plurality of beats corresponding to a plurality of said sensors of each detection result, it occurs between the plurality of sensors each detecting result A second determination is made to determine whether the pulsation is normally detected based on the amount of deviation related to the detection timing of the pulsation to be obtained.
A signal processing device that determines whether or not a pulsation is normally detected by the sensor based on a combination of the determination result of the first determination and the determination result of the second determination. When both the determination result of the first determination and the determination result of the second determination indicate that the pulsation is normally detected, the determination unit normally beats in the plurality of sensors. The signal processing apparatus according to claim 1, wherein it is determined that When one of the determination result of the first determination and the determination result of the second determination does not indicate that the pulsation is normally detected, the determination unit normally uses the plurality of sensors. The signal processing device according to claim 1 or 2, which does not determine that a pulsation has been detected. When making the first determination, the determination unit
A plurality of the beats are compared to determine whether the beats match.
The signal according to any one of claims 1 to 3, wherein when it is determined that a plurality of the beat numbers match, it is determined that the beat is normally detected with respect to the first determination. Processing equipment. When making the second determination, the determination unit
It is determined whether the amount of deviation related to the detection timing of the beat is within a predetermined range, and the result is determined.
Any one of claims 1 to 4, wherein when it is determined that the amount of deviation related to the detection timing of the beat is within a predetermined range, it is determined that the beat is normally detected with respect to the second determination. The signal processing device according to the section. The signal processing device according to any one of claims 1 to 5, wherein the determination unit further performs a third determination of determining whether or not the plurality of beats are within a predetermined range. The determination unit
If, as a result of performing the third determination, it is not determined that the plurality of beats are within a predetermined range, the first determination and the second determination are not performed.
The sixth aspect of claim 6, wherein when it is determined that the plurality of beats are within a predetermined range as a result of performing the third determination, the first determination and the second determination are performed. Signal processing device. If the determination unit does not determine that the plurality of beats are within a predetermined range as a result of performing the third determination, the determination unit does not perform processing based on the detection results of the plurality of sensors. Item 6. The signal processing apparatus according to Item 6. Based on the detection results of a plurality of sensors that detect beats at different positions in the detection target, a computer is made to perform a step of determining whether the beats are normally detected by the sensors.
In the determination step,
First and determining determines normal beats are detected by comparing the number of the plurality of beats corresponding to a plurality of said sensors of each detection result, it occurs between the plurality of sensors each detecting result A second determination is made to determine whether the pulsation is normally detected based on the amount of deviation regarding the detection timing of the pulsation to be obtained.
A program for determining whether or not a pulsation is normally detected by the sensor based on a combination of the determination result of the first determination and the determination result of the second determination.

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