WO2026004033A1 - Measurement system and signal read-out device - Google Patents

Abstract

This measurement system (10) comprises: a plurality of measurement terminals (11) that measure biological signals; and a signal read-out device (12). The measurement terminals each comprise: a biological signal acquisition unit (111); a terminal reception unit (113); and a terminal transmission unit (114). The signal read-out device (12) comprises: a read-out reception unit (121); and a read-out electrode unit (122). At least two measurement terminals that constitute a differential amplifier circuit are electrically connected to one another through a living body, and a biological signal is transmitted from the terminal transmission unit of one measurement terminal and received by the terminal reception unit of the other measurement terminal. When the read-out electrode unit is disposed so as to be in direct contact with the living body, or so as to be electrically connected by capacitive coupling, the read-out reception unit reads out the biological signal from the measurement terminal by using a quasi-electrostatic field.

Description

Measurement system and signal readout device

The present invention relates to a measurement system and signal readout device for measuring biological signals.

Currently, many wearable devices and electronic devices are connected via wireless communication such as Wi-Fi and BLE (Bluetooth Low Energy). These wireless communications have fixed bandwidth, and as the number of connected devices increases, bandwidth congestion can cause communication stability to deteriorate.

In biosignal measurement, wearable devices (hereinafter referred to as measurement devices) are attached to multiple parts of the body, and the voltage information required for biosignal measurement can be amplified using a differential amplifier circuit configuration that propagates modulated signals between each other on the user's body (Non-Patent Document 1).

Kento Watanabe et al., "Proposal of a Wireless Electrocardiogram Measurement Circuit Using the Human Body as Inter-element Wiring," Proceedings of the 2023 Institute of Electronics, Information and Communication Engineers General Conference, Vol. 1 (2023), p. 467.

In the biosignal measurement described above, the amplified signal is converted to digital form and transmitted from each device to a smartphone, server, etc. via a wireless module. As a result, each user needs to pair with devices such as BLE for each device worn, and the communication bandwidth becomes constrained depending on the number of devices worn, creating a problem.

In order to solve the above-mentioned problems, the measurement system of the present invention comprises a plurality of measurement terminals for measuring biosignals and a signal readout device, wherein the measurement terminal comprises a biosignal acquisition unit for acquiring the biosignal, a terminal receiving unit, a receiving electrode unit connected to the terminal receiving unit, a terminal transmitting unit, and a transmitting electrode unit connected to the terminal transmitting unit, and the signal readout device comprises a readout receiving unit and a readout electrode unit connected to the readout receiving unit, at least two of the plurality of measurement terminals form a differential amplifier circuit, the two measurement terminals are electrically connected via a living body, the biosignal is transmitted from the terminal transmitting unit of one of the two measurement terminals and received by the terminal receiving unit of the other measurement terminal, and when the readout electrode unit is positioned so as to be in direct contact with the living body or so as to be electrically connected by capacitive coupling, the readout receiving unit reads out the biosignal from the measurement terminal in a quasi-electrostatic field.

Furthermore, the signal readout device of the present invention is a signal readout device that reads out biosignals from at least two measurement terminals that form a differential amplifier circuit via a living body out of a plurality of measurement terminals and has a terminal transmitter that measures the biosignal and transmits the biosignal via a transmitter electrode. The signal readout device includes a readout receiver and a readout electrode connected to the readout receiver, and when the readout electrode is positioned so as to be in direct contact with the living body or so as to be electrically connected by capacitive coupling, the readout receiver reads out the biosignal from the measurement terminal in a quasi-electrostatic field.

The present invention provides a measurement system and signal readout device that can reduce the bandwidth required for transmitting and receiving biological signals and prevent bandwidth congestion.

FIG. 1 is a schematic diagram showing the configuration of a measurement system and a signal readout device according to a first embodiment of the present invention. FIG. 2 is a schematic diagram showing an example of the configuration of a signal readout device according to the first embodiment of the present invention. FIG. 3 is a schematic diagram showing an example of the configuration of a signal readout device according to the first embodiment of the present invention. FIG. 4 is a schematic diagram showing an example of the configuration of a signal readout device according to the first embodiment of the present invention. FIG. 5 is a schematic diagram showing the configuration of a readout receiving section in a signal readout device according to a second embodiment of the present invention. FIG. 6 is a schematic diagram showing an example of the configuration of a readout receiving section in a signal readout device according to the second embodiment of the present invention. FIG. 7 is a diagram for explaining an example of a measurement system according to the third embodiment of the present invention. FIG. 8 is a diagram for explaining an example of a measurement system according to the third embodiment of the present invention. FIG. 9 is a diagram for explaining an example of a measurement system according to the third embodiment of the present invention. FIG. 10 is a diagram for explaining an example of a measurement system according to the third embodiment of the present invention.

First Embodiment
A measurement system and a signal readout device according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG.

<Configuration of measurement system and signal readout device>
1, a measurement system 10 according to this embodiment includes a plurality of measurement terminals 11 worn by a user, and a signal readout device 12. In the figure, dotted and dashed lines indicate the paths of propagating signals.

The measurement terminal 11 includes a biosignal acquisition unit 111, a circuit unit 112, a terminal receiving unit 113, and a terminal transmitting unit 114. It also includes a receiving electrode unit 115 connected to the terminal receiving unit 113, and a transmitting electrode unit 116 connected to the terminal transmitting unit 114. At least two of the multiple measurement terminals, measurement terminals 11_1 and 11_2, form a differential amplifier circuit.

The biosignal acquisition unit 111 comes into direct or indirect contact with the human body (living body) 1 and acquires the biosignal.

The terminal transmitter 114 transmits the signal obtained or amplified from the biosignal acquisition unit 111 to the other measurement terminal 11_2 that constitutes the differential amplifier circuit via the transmission electrode unit 116. For example, the terminal transmitter 114 modulates the signal and transmits it.

The terminal receiving unit 113 receives signals from the other measuring terminal 11_2 that constitutes the differential amplifier circuit via the receiving electrode unit 115. For example, the terminal transmitting unit 114 demodulates the received signals.

The circuit unit 112 amplifies the signal using differential amplification based on the signal obtained from the biosignal acquisition unit 111 and the signal obtained from the terminal receiving unit 113.

The signal readout device 12 includes a readout receiving unit 121 and a readout electrode unit 122. The signal readout device 12 may also include a storage unit 123.

The readout receiving unit 121 receives the biosignal from the transmitting electrode unit 116 of the measurement terminal 11 via the readout electrode unit 122. At this time, the signal reading device 12 receives the biosignal in the form of a modulated signal used for transmitting and receiving biosignals between the measurement terminals 11.

In the measurement terminal 11, it is desirable that the biosignal acquisition unit 111 be placed in direct contact with the human body (living body) 1 (e.g., the user's skin) to measure the biosignal.

In the measurement terminal 11, the biosignal acquisition unit 111 may be placed in indirect contact with the skin via clothing 2 or the like, and the biosignal may be measured. In this case, capacitive coupling is formed between the biosignal acquisition unit 111 and the human body (living body) 1. As a result, a differential amplifier circuit is formed via the human body (living body) 1 by the circuit of the measurement terminal 11_1 and the circuit of the other measurement terminal 11_2, making it possible to detect signals other than DC components. Furthermore, convenience can be improved because the user can wear the measurement terminal 11 over the clothing 2 without having to put on or take off the clothing 2.

In the terminal transmitter 114, signals may be modulated to efficiently use the human body (living body) 1 as a transmission path. Biological signals are typically sampled at 1 kHz or less for electrocardiograms and electroencephalograms, and at approximately 5 kHz or less for electromyograms. In this embodiment, interference between the biological signal and the transmission signal can be avoided by modulating at a higher frequency than these. Furthermore, by using a frequency (quasi-electrostatic field) with excellent transmission characteristics in the human body (living body) 1, around 1 MHz to 100 MHz, the modulated measurement signal can be efficiently transmitted within the human body (living body) 1. Modulation methods such as AM modulation and FM modulation may also be used. FM modulation is preferable because its transmission efficiency changes with human activity and is not affected by amplitude, as is the case with AM modulation. Modulation may also be performed using a VCO (Voltage Controlled Oscillator), a PLL (Phase Locked Loop) circuit, or a multivibrator using a crystal or varactor diode.

The signal readout device 12 may be in direct or indirect contact with the human body (living body) 1. Here, when the signal readout device 12 is in indirect contact with the human body (living body) 1, this refers to the case where the signal readout device 12 is electrically connected by capacitive coupling via the clothing 2, the electrode coating, etc. The signal readout device 12 may be placed in contact with the surface of the clothing 2, or may be placed in a pocket.

As described above, the signal readout device 12 receives the signal modulated by the measurement terminal 11. Therefore, the signal readout device 12 reads out the signal at a frequency of approximately 1 MHz to 100 MHz (quasi-electrostatic field). This prevents interference between the measured biosignal and the readout signal, allowing the signal to be transmitted efficiently within the human body (living body) 1.

The signal readout device 12 may have an impedance near the readout electrode 122. Because the signal readout device 12 does not directly measure biosignals, it is sufficient to acquire only the transmission signal used for transmission and reception. A quasi-electrostatic field, for example, an AC signal with a frequency of approximately 1 MHz to 100 MHz, can easily pass through (transmit) the human body (living body) 1, making it easy to receive signals even through clothing 2. Assuming the signal readout device 12 has a 1 cm square readout electrode 122 and transmits and receives signals through clothing 2 that is 1 mm thick, the capacitance between the signal readout device 12 and the human body (living body) 1 is approximately 1 pF, and the impedance at 10 MHz is approximately 16 kΩ. Therefore, by setting the input impedance of the signal readout device 12 to approximately 16 kΩ or several tens of times higher, for example, by setting the impedance to between 10 kΩ and 100 kΩ, signal attenuation can be suppressed and signals can be received.

The signal received by the signal readout device 12 is a modulated biological signal, so it is demodulated by the readout receiver 121 and stored in the storage unit 123.

If the transmission frequency differs for each measurement terminal 11, the signal band input to each readout receiver 121 can be limited using a bandpass filter corresponding to each frequency, and the received (modulated) signal can be demodulated, thereby acquiring the biosignal without using wireless communication such as BLE. Here, the readout receiver 121 of the signal readout device 12 may have a configuration similar to that of the terminal receiver 113 of the measurement terminal 11.

The data may be stored after signal processing has been performed after demodulation or digital conversion.

As shown in Figure 2, data can be saved by converting it to digital values using an analog-to-digital converter (A/D converter) 124 or the like, and then storing it on a storage medium 3 such as an SD card or non-volatile memory. This allows for the device to be handy and portable.

Alternatively, when the signal readout device 12 is installed in a building or the like, the readout signal may be transmitted to an external storage medium or electronic device 4 via a network 5, as shown in Figure 3. The network 5 may be a wired network line (Internet, intranet, etc.) or a wireless communication line. Even when wireless communication is used, the number of pairings and connected terminals can be reduced compared to when wireless communication is performed by each measurement terminal, so there is no problem with bandwidth congestion or suppression of pairings.

Furthermore, in the measurement system 10, the measurement terminal 11 no longer requires a wireless module, allowing for significant reductions in power consumption. In the measurement terminal (wearable device) 11, wireless communication mainly accounts for the majority of power consumption. Therefore, by not using a wireless module, the measurement terminal (wearable device) 11 can be used for a longer period of time. In addition, battery power can be reduced, making the measurement terminal 11 lighter. This makes it possible to provide a measurement system that is highly convenient for users.

Furthermore, as shown in FIG. 4, the signal readout device 12 may further include an arithmetic circuit unit 125, which performs further circuit calculations on the received signal. The signal readout device 12 includes a readout electrode unit 122, two readout receiving units 121_1 and 121_2 connected to the readout electrode unit 122, and an arithmetic circuit unit 125 connected to the two readout receiving units 121_1 and 121_2. The storage unit 123 may be connected to the arithmetic circuit unit 125.

An example of the operation of the signal readout device 12 is described below. Two measurement terminals are configured to send and receive signals at different frequencies.

Modulated signals from the two measurement terminals are input to the readout electrode unit 122. A filter (not shown) placed between the readout electrode unit 122 and the readout receivers 121_1 and 121_2 branches the signal from one measurement terminal (one signal) and the signal from the other measurement terminal (the other signal) into the two readout receivers 121_1 and 121_2, respectively.

The signals demodulated by the readout receivers 121_1 and 121_2 (one signal and the other signal) are input to the arithmetic circuit unit 125. The arithmetic circuit unit 125 performs differential amplification on one signal as a positive-phase signal and the other signal as a negative-phase signal.

Common mode noise is superimposed on the signal transmitted from the measurement terminal. After the signal is demodulated by the readout receivers 121_1 and 121_2 of the signal readout device 12, the common mode noise is removed using a differential calculation circuit (subtraction circuit), allowing only the desired biosignal to be read out.

When three or more measurement terminals are attached, for example, to save data for each limb lead in an electrocardiogram measurement, three combinations are required so that the signal readout device 12 acquires potential differences from two of the left hand, right hand, and left foot. When acquiring these three patterns of potential differences, connecting the arithmetic circuit unit 125 makes it possible to remove common mode noise and output the limb leads, allowing data to be saved with high resolution. This allows for more precise analysis of biological signals, etc.

The measurement system and signal readout device according to this embodiment can receive and collect biosignals from a measurement terminal near the human body (living body) without using wireless communication such as BLE. This reduces the bandwidth required for sending and receiving biosignals within the measurement system, preventing bandwidth congestion. It also eliminates the need for pairing operations between multiple BLE or other devices, improving usability and enabling comfortable health monitoring.

Second Embodiment
A measurement system and a signal readout device according to a second embodiment of the present invention will be described with reference to FIGS.

<Configuration of measurement system and signal readout device>
The measurement system according to this embodiment includes a plurality of measurement terminals and a signal readout device, similar to the first embodiment.

As shown in Figure 5, the readout receiving unit 121 in the signal readout device includes a demodulation circuit 1211 and multiple receiving frequency setting units 1212.

In the readout receiver 121, multiple reception frequency setting units 1212 are switched in a time-division manner using switch 1213, thereby performing demodulation of only one predetermined frequency band at a given time. By performing the switching operation in a short period of time, signals can be demodulated at multiple frequencies, and demodulated signals (dotted arrows in the figure) are output.

In the first embodiment, the same number of readout receivers as the number of measurement terminals is required. As a result, the power consumption and circuit area of the receiver circuit increase.

In contrast, in this embodiment, signals from multiple measurement terminals are received at different frequencies by modulating the signals at each of the multiple measurement terminals at different frequencies. By using a common demodulation circuit 1211 and variably setting the frequency of the signal to be demodulated, signals from multiple measurement terminals can be demodulated with a single readout receiver 121. This reduces power consumption in the receiver circuit and reduces the circuit area.

FIG. 6 shows an example of a configuration applied to FM modulation of the readout receiver 121 in this embodiment. The readout receiver 121 includes a phase detector/charge pump (PD/CP) 1214, an oscillator 1215, a filter 1216, and multiple voltage-controlled resonant circuits 1217.

A modulation signal is input from the readout electrode section 122 to the phase detector/charge pump (PD/CP) 1214. A signal from the oscillator 1215 is also input to the PD/CP 1214.

After the phases of the two signals are compared by the PD/CP1214, the comparison result (phase difference) is output as a voltage from the charge pump. A low-frequency signal is obtained by passing the output voltage through a filter such as a loop filter.

This low-frequency signal is applied to the voltage-controlled resonant circuit 1217. The resonant frequency (set frequency) of the voltage-controlled resonant circuit 1217 changes depending on the applied voltage of the low-frequency signal. This changes the frequency of the oscillator 1215.

In the PD/CP 1214, when the frequency of the input signal from the oscillator 1215 matches the frequency of the received signal from the readout electrode unit 122, the low-frequency signal is output as a demodulated signal (dotted arrow in the figure).

In this embodiment, the resonant point is voltage-controlled by applying demodulated signals to multiple voltage-controlled resonant circuits 1217, so that one voltage-controlled resonant circuit 1217 is always connected to the oscillator 1215. This allows multiple signals to be demodulated in a time-division manner using a single receiving unit, reducing power consumption and circuit area.

In this embodiment, a switchable filter circuit, similar to the resonant circuit, may be arranged between the readout electrode unit 122 and the PD/CP 1214. This makes it possible to avoid locking at an unintended frequency by filtering the received signal in advance. In this way, demodulation operation can be stabilized. The switching frequency in this configuration is preferably equal to or higher than the required sampling rate of the biological signal being measured. For example, electrocardiograms require a sampling rate of approximately 100 to 1 kHz, so switching at a speed of 10 ms to 1 ms or more is desirable. Electromyograms require faster sampling, such as 5 kHz, so switching at a speed of 0.2 ms or more is desirable.

According to this embodiment, a single receiving unit in the signal readout device can receive and collect biosignals from a measurement terminal near the human body (living body) without using wireless communication such as BLE. This reduces the power consumption and circuit area of the signal readout device.

Furthermore, the bandwidth required for sending and receiving biological signals within the measurement system 10 can be reduced, preventing bandwidth congestion. Furthermore, pairing operations between multiple BLE devices and other devices can be eliminated, improving usability and enabling comfortable health monitoring.

Third Embodiment
A measurement system according to a third embodiment of the present invention will be described with reference to Figures 7 to 10. In the measurement system according to this embodiment, the signal readout device according to the first embodiment or the signal readout device according to the second embodiment may be used.

<Configuration of measurement system>
A handheld reading device may be used as an example of the measurement system according to this embodiment. As shown in FIG. 7 , a person other than the user, such as a medical professional (doctor or nurse), may hold the signal reading device 12 in his/her hand and bring it close to the user's body while wearing the measurement terminal 11. Because the signal reading device 12 is not affected by clothing, the user can wear the measurement terminal 11 in a predetermined position in advance to measure biosignals while wearing their clothes, ensuring privacy. For example, during a health checkup, other tests can be performed while wearing the measurement terminal 11, and an electrocardiogram can be measured during the waiting time, thereby improving work efficiency.

Another example of a measurement system is an environmentally-located measurement system, as shown in Figure 8, in which a signal readout device 12 is placed in a part of a building such as a house or hospital, for example, on the floor 6 or wall 7, and configured to automatically read out signals. When a user wearing a measurement terminal 11 touches or approaches the signal readout device 12 installed on the floor or wall 7, the transmission signal emitted from the user's body is received and the biosignal may be read out.

As a result, when the measurement terminal 11 is worn by the user, the signal can be read automatically without the assistance of anyone other than the user. For example, if the measurement terminal 11 is worn on both hands, the transmission signal propagates throughout the body, so the signal readout device 12 on the floor 6 may read the biosignal via the feet. If the measurement terminal 11 is worn on the feet or chest, the signal readout device 12 on the wall 7 may read the biosignal via another part of the body.

This allows signals to be collected without the user's awareness, enabling long-term monitoring. By setting the transmission signal of the measurement terminal 11 worn by each user to a different frequency, users can be identified based on frequency information, thereby avoiding the risk of data confusion.

As another example of a measurement system, the signal readout device 12 may read out signals using multiple readout electrode units 122. For example, as shown in FIG. 9, multiple readout electrode units 122 may be arranged in an array in the signal readout device 12. The frequency band (quasi-electrostatic field) of 1 MHz to 100 MHz used for signal transmission through the human body (living body) 1 is distributed only in the immediate vicinity of the transmission medium. Therefore, by arranging the readout electrode units 122 of the signal readout device 12 in an array, the signal amplitude transmitted to each readout electrode unit 122 can be monitored in each array, and the position of the array that receives the strongest signal can be determined as the user's position. In this way, the position of the user wearing the measurement terminal 11 can be obtained from the position of the readout electrode unit 122 that receives the biosignal among the multiple readout electrode units 122.

As another example of a measurement system, as shown in Figure 10, multiple readout electrode units 122 of the signal readout device 12 may be placed at multiple positions on the floor 6, wall 7, etc., and the user's position may be determined by combining the signal strength received by each readout electrode unit 122.

In the measurement system, the transmitted signal is distributed locally, so the signal is received with high signal strength only at the readout electrode unit 122 closest to the user's position. As the user's position moves away from the readout electrode unit 122, the received signal strength decreases. In the measurement system, the position of the readout electrode unit 122 where the signal is received with high signal strength may be determined to be the user's position.

For example, when the user moves away from the wall 7 on which the readout electrode unit 122 is located and is located in a location where the readout electrode unit 122 is located only on the floor 6, a signal (peak of the dashed line in the figure) is read out only from the readout electrode unit 122 located on the floor 6, and the strength of the readout signal is low. When the user is located near the wall 7 on which the readout electrode unit 122 is located and the floor 6, a signal (peak of the dotted line in the figure) is read out from the readout electrode unit 122 on the floor 6 and the readout electrode unit 122 on the wall 7, and the strength of the summed readout signal (peak of the solid line in the figure) is high. Also, when the user uses a wheelchair, the measurement terminal 11 attached to the foot moves away from the floor 6, and the strength of the signal read out from the readout electrode unit 122 on the wall 7 is low. Also, by placing at least one of the floor 6 and the wall 7 within the space where the user's position is to be determined, it is possible to determine whether the user is near the floor 6 or wall 7 based on the signal strength. Therefore, by placing multiple floors 6 and walls 7 within a space, it is possible to identify a location without using GPS.

In this way, the position of the user wearing the measuring terminal 11 can be obtained from the strength of the signal obtained by combining the signals acquired by each of the multiple readout electrode units 122.

In addition, in the measurement system, the distribution of signal levels changes as the user moves, making it possible to track the user's location over time. This makes it possible to monitor the user's activity status, which is useful in medical care, rehabilitation, etc. Furthermore, by visualizing the user's location, nurses and others can easily check the user's location information, making it easier to search for the user.

In the embodiments of the present invention, examples of the structure, dimensions, materials, etc. of each component in the configuration of the measurement system and signal readout device are shown, but this is not limiting. Anything that demonstrates the functions and effects of the measurement system and signal readout device will suffice.

It should be noted that the present invention is not limited to the above-described embodiments, and it is clear that many modifications and combinations can be made by those skilled in the art within the technical spirit of the present invention.

The above-described embodiment or example thereof, in whole or in part, may also be described as, but is not limited to, the following notes.

(Appendix 1) A measurement system comprising: a plurality of measurement terminals for measuring biosignals; and a signal readout device; the measurement terminals comprising a biosignal acquisition unit for acquiring biosignals, a terminal receiving unit, a receiving electrode unit connected to the terminal receiving unit, a terminal transmitting unit, and a transmitting electrode unit connected to the terminal transmitting unit; the signal readout device comprising a readout receiving unit and a readout electrode unit connected to the readout receiving unit; at least two of the plurality of measurement terminals form a differential amplifier circuit; the two measurement terminals are electrically connected via a living body; the biosignal is transmitted from the terminal transmitting unit of one of the two measurement terminals and received by the terminal receiving unit of the other measurement terminal; and when the readout electrode unit is positioned so as to be in direct contact with the living body or so as to be electrically connected by capacitive coupling, the readout receiving unit reads out the biosignal from the measurement terminal in a quasi-electrostatic field.

(Appendix 2) The measurement system described in Appendix 1 includes a plurality of readout electrode units, and acquires the position of the user wearing the measurement terminal from the position of the readout electrode unit that receives the biosignal among the plurality of readout electrode units.

(Appendix 3) The measurement system described in Appendix 1 includes a plurality of readout electrode units, and acquires the position of the user wearing the measurement terminal from the strength of a signal obtained by combining the biosignals acquired by each of the plurality of readout electrode units.

(Appendix 4) A signal readout device that reads biosignals from at least two measurement terminals that form a differential amplifier circuit via a living body out of multiple measurement terminals and has a terminal transmitter that measures the biosignal and transmits the biosignal via a transmitter electrode. The signal readout device includes a readout receiver and a readout electrode connected to the readout receiver, and when the readout electrode is positioned so as to be in direct contact with the living body or so as to be electrically connected by capacitive coupling, the readout receiver reads the biosignal from the measurement terminal in a quasi-electrostatic field.

(Appendix 5) The signal readout device described in Appendix 4, further comprising an impedance disposed near the readout electrode portion, the impedance being 10 kΩ or more and 100 kΩ or less.

(Appendix 6) The signal readout device described in Appendix 4 or Appendix 5, further comprising an arithmetic circuit unit that reduces common-mode noise.

(Appendix 7) A signal readout device according to any one of appendices 4 to 6, wherein the readout receiver includes a single receiver circuit and switches the frequency of the readout biological signal in a time-division manner.

(Appendix 8) The signal readout device described in Appendix 7, wherein the single receiving circuit includes a demodulation circuit and multiple receiving frequency setting units, each of which is set to a different receiving frequency, and the demodulation circuit demodulates the readout biological signal at a predetermined receiving frequency by switching the connection between the demodulation circuit and one of the multiple receiving frequency setting units.

(Appendix 9) A measurement system described in any one of Appendices 1 to 3, wherein each of the multiple measurement terminals transmits and receives biological signals at a different frequency.

(Appendix 10)
the measuring terminal includes a circuit unit,
The measurement system according to any one of Supplementary Note 1 to Supplementary Note 3 and Supplementary Note 9, wherein the circuit unit performs differential amplification based on the signal obtained from the biological signal acquisition unit and the signal obtained from the terminal receiving unit.

(Appendix 11)
The measurement system according to any one of Supplementary Note 1 to Supplementary Note 3, Supplementary Note 9, and Supplementary Note 10, wherein the biological signal acquisition unit is positioned so as to be in direct contact with the living body or so as to be electrically connected by capacitive coupling to acquire the biological signal.

(Appendix 12)
12. The measurement system according to any one of claims 1 to 3 and 9 to 11, wherein the terminal transmitting unit 114 modulates the biological signal with a quasi-electrostatic field.

The present invention can be applied to biosignal measurement systems.

10 Measurement system 11 Measurement terminal 111 Biosignal acquisition unit 113 Terminal receiving unit 114 Terminal transmitting unit 115 Receiving electrode unit 116 Transmitting electrode unit 12 Signal reading device 121 Reading receiving unit 122 Reading electrode unit

Claims (8)

a plurality of measurement terminals for measuring biological signals;
a signal readout device;
The measuring terminal
a biological signal acquisition unit that acquires a biological signal;
A terminal receiving unit;
a receiving electrode unit connected to the terminal receiving unit;
A terminal transmitter;
a transmitting electrode unit connected to the terminal transmitting unit,
The signal readout device
a read receiver;
a readout electrode unit connected to the readout receiver unit,
At least two of the plurality of measurement terminals constitute a differential amplifier circuit,
the two measurement terminals are electrically connected via a living body,
The biological signal is transmitted from the terminal transmitting unit of one of the two measurement terminals, and the biological signal is received by the terminal receiving unit of the other measurement terminal;
A measurement system in which, when the readout electrode unit is positioned so as to be in direct contact with a living body or so as to be electrically connected by capacitive coupling, the readout receiving unit reads out the biological signal from the measurement terminal in a quasi-electrostatic field. a plurality of the readout electrode portions;
The measurement system according to claim 1 , wherein the position of the user wearing the measurement terminal is acquired from the position of the readout electrode unit that receives the biosignal among the plurality of readout electrode units. a plurality of the readout electrode portions;
The measurement system according to claim 1 , wherein the position of the user wearing the measurement terminal is obtained from the intensity of a signal obtained by combining the biosignals obtained by each of the plurality of readout electrode units. A signal readout device for reading out biosignals from at least two measurement terminals, which are among a plurality of measurement terminals and have a terminal transmitter that measures biosignals and transmits the biosignals via a transmission electrode unit, and which configure a differential amplifier circuit via a living body,
a read receiver;
a readout electrode unit connected to the readout receiver unit,
A signal reading device in which, when the reading electrode unit is positioned so as to be in direct contact with a living body or so as to be electrically connected by capacitive coupling, the reading receiving unit reads out the biological signal from the measurement terminal in a quasi-electrostatic field. an impedance arranged near the readout electrode portion;
5. The signal readout device according to claim 4, wherein the impedance is 10 kΩ or more and 100 kΩ or less. The signal readout device of claim 4 or claim 5, further comprising an arithmetic circuit unit that reduces common-mode noise. the read receiver comprises a single receiver circuit;
6. The signal readout device according to claim 4, wherein the frequency of the readout biological signal is switched in a time-division manner. the single receiving circuit
A demodulation circuit;
a plurality of reception frequency setting units;
different reception frequencies are set in the plurality of reception frequency setting units,
8. The signal readout device according to claim 7, wherein the demodulation circuit demodulates the readout biological signal at a predetermined reception frequency by switching a connection between the demodulation circuit and any one of the plurality of reception frequency setting units.