TW202034344A - Vital-sign detecting system and method - Google Patents

Abstract

A vital-sign detecting system includes radio-frequency (RF) tags disposed on detected subjects respectively, one of the RF tags being turned on and generating an incident RF signal with a predetermined frequency, and the incident RF signal projecting on a corresponding detected subject to generate a corresponding reflected RF signal; and at least one radio-frequency identification (RFID) radar that turns on one of the RF tags, demodulates the reflected RF signal to obtain vital signal of the corresponding detected subject, and identifies the detected subject according to the turned-on RF tag.

Description

Physiological information detection system and method

The present invention relates to physiological information detection, and particularly relates to a physiological information detection system and method capable of identifying the identity of a subject.

Body temperature (BT), blood pressure (BP), heart rate (HR) and respiratory rate (RR) are four main physiological information (vital signs). The detection or measurement of physiological information can be used to assess the health of the body and can provide clues to diseases.

The traditional non-contact physiological information detection system can be used to remotely measure the physiological information of the subject, such as heart rate or breathing rate. Since the cost of the detection system is not low, one detection system is usually used to measure multiple subjects. However, the corresponding signals of multiple subjects interfere with each other, thereby reducing the accuracy of the measurement. Furthermore, when multiple subjects are close to each other, it is difficult for the detection system to identify individual subjects, which often results in identification errors.

Therefore, there is an urgent need to propose a physiological information detection mechanism that can identify the subject to improve the lack of traditional physiological information detection systems.

In view of the above, one of the objectives of the embodiments of the present invention is to provide a physiological information detection system and method, which can identify the identity of the subject and improve the detection accuracy.

According to an embodiment of the present invention, the physiological information detection system includes a plurality of radio frequency tags and at least one radio frequency identification radar. The radio frequency tags are respectively set on the subject, and when one of the radio frequency tags is turned on, an incident radio frequency signal of a predetermined frequency is generated, which is projected to the corresponding subject to generate a corresponding reflected radio frequency signal. The radio frequency identification radar turns on one of the radio frequency tags, and demodulates the reflected radio frequency signal to obtain the physiological information of the corresponding subject, and identifies the subject according to the turned on radio frequency tag.

The first figure shows a block diagram of the vital sign detection system 100 (hereinafter referred to as the detection system) according to the first embodiment of the present invention. In this embodiment, the detection system 100 may include a radio frequency identification (RFID) radar 11 and a harmonic RF tag 12 (hereinafter referred to as a tag). The radio frequency identification radar 11 can communicate with the tags 12 through the radio frequency identification antenna 110A to turn on one of the tags 12. The tags 12 are respectively set on the subject 13 (for example, worn on the chest of the subject 13).

The radio frequency identification radar 11 of this embodiment can transmit radio frequency signals of a predetermined frequency through the transmitting antenna 111. When the tag 12 is turned on, the corresponding incident harmonic signal can be generated according to the radio frequency signal. For example, when the tag 1 (12) is turned on, receiving the radio frequency signal F emitted by the transmitting antenna 111 can generate the corresponding incident harmonic signal FH, such as the second harmonic signal (where the frequency of FH is the second of F). Times). The incident harmonic signal FH is projected to the subject 13 to generate a reflected harmonic signal FN, which is received by the radio frequency identification radar 11 through the receiving antenna 112. The motion of the subject 13 where the tag 12 is turned on will modulate the incident harmonic signal to change its phase. Therefore, the RFID radar 11 can demodulate the reflected harmonic signal to know the subject 13’s Physiological information, such as breathing or heart rate. Since only one tag 12 is turned on at a time, the radio frequency identification radar 11 can identify the subject 13 corresponding to the received reflected harmonic signal.

The second figure shows a detailed block diagram of the detection system 100 of the first figure, and only one of the test subjects 13 and the corresponding tag 12 are shown. In this embodiment, the radio frequency identification radar 11 may include a master radio frequency identification unit 118, and the tag 12 may include a slave radio frequency identification unit 120. The master radio frequency identification unit 118 and the slave radio frequency identification unit 120 can communicate with the radio frequency identification antenna 110A (of the radio frequency identification radar 11) and the radio frequency identification antenna 110B (of the tag 12) so that only one tag 12 is turned on at a time .

In this embodiment, the radio frequency identification radar 11 may include a transmitter 113, which can generate a radio frequency signal F of a predetermined frequency, which can be transmitted to the tag 12 by the transmitting antenna 111. The tag 12 may include a harmonic transmitting antenna unit 121 whose resonance frequency is the same as the frequency of the radio frequency signal F to generate a resonance reaction to generate a corresponding incident harmonic signal FH, such as a second harmonic signal.

The radio frequency identification radar 11 of this embodiment may include a harmonic receiver 114, which receives the reflected harmonic signal FN through the receiving antenna 112, the frequency of which is the same as the incident harmonic signal FH, but the phase is affected by the position where the tag 12 is turned on. Subject 13's body movement is modulated.

The radio frequency identification radar 11 of this embodiment may include a harmonic demodulator 115, which demodulates the reflected harmonic signal FN received by the (harmonic receiver 114) to obtain a baseband containing phase change information. Signal. The radio frequency identification radar 11 may include a processor 116, and the processor 116 may include an analog-to-digital converter and a digital signal processor. The processor 116 performs analog-to-digital conversion on the fundamental frequency signal (output by the harmonic demodulator 115) and removes high frequency components. After calculation, physiological information of the subject 13, such as breathing or heart rate, can be obtained. The aforementioned removal of high frequency components is performed by the digital signal processor, which may include removal of inappropriate breathing harmonics, removal of noise, etc., but is not limited to this. The radio frequency identification radar 11 of this embodiment may include a controller 117 for controlling the operations of the main radio frequency identification unit 118, the transmitter 113, the harmonic receiver 114, the harmonic demodulator 115, and the processor 116. In this embodiment, as shown in the second figure, the transmitter 113 is connected to the transmitting antenna 111 to transmit the radio frequency signal F, the harmonic receiver 114 is connected to the receiving antenna 112 to receive the reflected harmonic signal FN, and the harmonic demodulator 115 is connected to the harmonic receiver 114 to demodulate the reflected harmonic signal FN, the processor 116 is connected to the harmonic demodulator 115 to process the fundamental frequency signal, and the main radio frequency identification unit 118 is connected to the radio frequency identification antenna 110A for and from the radio frequency identification The radio frequency identification antenna 110B of the unit 120 communicates.

FIG. 3A shows a flowchart of the physiological information detection method 300 (hereinafter referred to as the detection method) according to the first embodiment of the present invention. FIG. 3B shows a block diagram of the detection system 100 corresponding to FIG. 3A. In step 31, the radio frequency identification radar 11 turns on one of the tags 12. In step 32, the transmitter 113 of the radio frequency identification radar 11 transmits the radio frequency signal F of the preset frequency to the opened tag 1 (12) through the transmitting antenna 111. The harmonic transmitting antenna unit 121 of the tag 12 will resonate with the radio frequency signal F to generate the corresponding incident harmonic signal FH to the corresponding subject 13 (step 33).

In step 34, the movement of the subject 13 at the opened tag 12 modulates the incident harmonic signal FH to change its phase, thereby generating a reflected harmonic signal FN. In step 35, the harmonic receiver 114 of the radio frequency identification radar 11 receives the reflected harmonic signal FN; then, the harmonic demodulator 115 of the radio frequency identification radar 11 demodulates the reflected harmonic signal FN to obtain the fundamental frequency signal; The processor 116 of the radio frequency identification radar 11 performs analog-to-digital conversion on the fundamental frequency signal containing phase change information, and removes high-frequency components. After arithmetic processing, the physiological information of the subject 13, such as breathing or heart rate, is obtained.

Finally, in step 36, the obtained physiological information is integrated with the corresponding tag 12 and the subject 13, where the opened tag 12 can be used for identification (ID).

Then, if the radio frequency identification radar 11 still has other subjects 13 to be detected (step 37), the radio frequency identification radar 11 selects the tag of the next identity (step 38), and then repeats the steps 31 to 36. That is, the selected tag 12 is turned on (step 31), the radio frequency signal F of the preset frequency is transmitted to the turned-on tag 12 (step 32), and the corresponding incident harmonic signal FH is generated to the corresponding subject 13 (step 33) , Generate the reflected harmonic signal FN (step 34), obtain the physiological information of the subject 13 (step 35), and integrate the obtained physiological information with the corresponding tag 12 and the subject 13 (step 36). If it is determined in step 37 that there are no other subjects 13 to be detected by the radio frequency identification radar 11, the flow of the detection method 300 is ended.

The fourth figure shows a block diagram of the detection system 100B of the first modification of the first embodiment of the present invention. The difference from the detection system 100 shown in FIG. 3B is that this embodiment (FIG. 4) uses a plurality of (for example, two) tags 12A and 12B to be set on a single subject 13. In this way, the radio frequency identification radar 11 can detect the plural physiological information of a single subject 13 by sequentially turning on the tags 12A and 12B through time division multiplexing in the same time period.

The fifth figure shows a block diagram of the detection system 100C of the second variation of the first embodiment of the present invention. The difference from the detection system 100 shown in the second figure is that the radio frequency identification radar 11 of this embodiment (the fifth figure) uses a dual band receiver 114B instead of the harmonic receiver 114. One of the frequency bands Same as the second figure, it is used to receive the reflected harmonic signal FN. In addition, another frequency band is used to receive the reflected RF signal FR transmitted by the RF signal F to the subject 13 (but without the tag 12) and reflected back, and then demodulated by the demodulator 115B. In this way, the radio frequency identification radar 11 can detect the plural physiological information of a single subject 13 in the same time period through time division multiplexing.

The sixth figure shows a block diagram of the physiological information detection system 600 (hereinafter referred to as the detection system) according to the second embodiment of the present invention. The second embodiment is similar to the first embodiment, and the differences are explained as follows.

In this embodiment, the radio frequency tag 12 (hereinafter referred to as the tag) may include a radio frequency transmitter 122, and when the tag 12 is turned on, it can emit an incident radio frequency signal FH of a predetermined frequency. The radio frequency identification radar 11 of this embodiment may include a radio frequency receiver 114C, which is similar to the harmonic receiver 114 of the first embodiment, for receiving the reflected radio frequency signal FN. The radio frequency identification radar 11 may include a radio frequency demodulator 115C, which is similar to the harmonic demodulator 115 of the first embodiment, for demodulating the reflected radio frequency signal FN received by (the radio frequency receiver 114C) to obtain the Base frequency signal of phase change information.

The incident radio frequency signal FH is projected to the subject 13 to generate a reflected radio frequency signal FN, which is received by the radio frequency identification radar 11 through the receiving antenna 112. The movement of the subject 13 where the tag 12 is opened will modulate the incident radio frequency signal FH to change its phase. Therefore, the radio frequency identification radar 11 can obtain the physiological information of the subject 13 by demodulating the reflected radio frequency signal FNx. For example, breathing or heart rate. The radio frequency identification radar 11 of this embodiment does not need the transmitter 113 and the transmitting antenna 111 (of the first embodiment).

FIG. 7A shows a flowchart of the physiological information detection method 700 (hereinafter referred to as the detection method) according to the second embodiment of the present invention, and FIG. 7B shows a block diagram of the detection system 600 corresponding to FIG. 7A. In step 71, the radio frequency identification radar 11 turns on one of the tags 12. In step 72, the radio frequency transmitter 122 of the opened tag 12 transmits an incident radio frequency signal FH of a predetermined frequency.

In step 73, the movement of the subject 13 at the opened tag 12 modulates the incident radio frequency signal FH to change its phase, thereby generating a reflected radio frequency signal FN. In step 74, the radio frequency receiver 114C of the radio frequency identification radar 11 receives the reflected radio frequency signal FN; then, the radio frequency demodulator 115C of the radio frequency identification radar 11 demodulates the reflected radio frequency signal FN to obtain a base frequency signal containing phase change information ; The processor 116 of the radio frequency identification radar 11 performs analog-to-digital conversion on the fundamental frequency signal containing phase change information, and removes high-frequency components. After arithmetic processing, the physiological information of the subject 13, such as breathing or heart rate .

Finally, in step 75, the obtained physiological information is integrated with the corresponding tag 12 and the subject 13, where the opened tag 12 can be used for identification (ID).

Then, if the radio frequency identification radar 11 still has other subjects 13 to be detected (step 76), the radio frequency identification radar 11 selects the tag of the next identity (step 77), and then repeats the steps 71 to 75. If it is determined in step 76 that there are no other subjects 13 to be detected by the radio frequency identification radar 11, the flow of the detection method 700 is ended.

Fig. 8 shows a block diagram of a detection system 600B of the first modification of the second embodiment of the present invention. The difference from the detection system 600 shown in Figure 7B is that this embodiment (Figure 8) uses a plurality of (for example, two) RFID radars 11A and 11B, which correspond to different tags 12 and subjects respectively. 13. In this way, the radio frequency identification radars 11A and 11B can identify different identities at the same time, but the second embodiment (Figure 7B) can only identify a single identity at a certain time.

Fig. 9 shows a block diagram of a detection system 600C according to a second variation of the second embodiment of the present invention. The difference from the detection system 600 shown in Figure 6 is that this embodiment (Figure 9) uses multiple (for example, two) tags 12A and 12B to be set on a single subject 13. In this way, the radio frequency identification radar 11 can detect the plural physiological information of a single subject 13.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; all other equivalent changes or modifications made without departing from the spirit of the invention should be included in the following Within the scope of patent application.

100: Physiological Information Detection System 100B: Physiological Information Detection System 100C: Physiological Information Detection System 600: Physiological Information Detection System 600B: Physiological Information Detection System 600C: Physiological Information Detection System 11: Radio frequency identification radar 11A: Radio Frequency Identification Radar 11B: Radio Frequency Identification Radar 110A: RFID antenna 110B: RFID antenna 111: Transmitting antenna 112: receiving antenna 113: Launcher 114: Harmonic receiver 114B: Dual-band receiver 114C: RF receiver 115: Harmonic demodulator 115B: Demodulator 115C: RF demodulator 116: processor 117: Controller 118: Main RFID unit 12, 12A, 12B: harmonic radio frequency tag / radio frequency tag 120: Slave RFID unit 121: Harmonic transmitting antenna unit 122: RF transmitter 13: Subject 300: Physiological Information Detection Method 31: RFID radar turns on one of the tags 32: Transmit RF signal 33: The tag generates the corresponding incident harmonic signal 34: Generate reflected harmonic signal 35: Receive, demodulate and process reflected harmonic signals to obtain physiological information 36: Integrate physiological information with corresponding labels and subjects 37: Determine whether there are other subjects 38: Choose the label of the next identity 700: Physiological Information Detection Method 71: Radio frequency identification radar opens one of the tags 72: Tag launches incident RF signal 73: Generate reflected RF signal 74: Receive, demodulate and process the reflected radio frequency signal to obtain physiological information 75: Integrate physiological information with corresponding labels and subjects 76: Determine whether there are other subjects 77: Choose the label of the next identity F: RF signal FH: incident harmonic signal / incident radio frequency signal FN: reflected harmonic signal/reflected radio frequency signal FR: Reflected RF signal

The first figure shows a block diagram of the physiological information detection system according to the first embodiment of the present invention. The second figure shows a detailed block diagram of the detection system in the first figure. FIG. 3A shows a flowchart of the physiological information detection method according to the first embodiment of the present invention. Fig. 3B shows a block diagram of the detection system corresponding to Fig. 3A. The fourth figure shows a block diagram of the detection system of the first variant of the first embodiment of the present invention. The fifth figure shows a block diagram of the second variation of the detection system of the first embodiment of the present invention. The sixth figure shows a block diagram of the physiological information detection system according to the second embodiment of the present invention. FIG. 7A shows a flowchart of the physiological information detection method according to the second embodiment of the present invention. Figure 7B shows a block diagram of the detection system corresponding to Figure 7A. Fig. 8 shows a block diagram of the detection system of the first variation of the second embodiment of the present invention. Fig. 9 shows a block diagram of a second variation of the detection system of the second embodiment of the present invention.

100: Physiological Information Detection System

11: Radio frequency identification radar

110A: RFID antenna

111: Transmitting antenna

112: receiving antenna

12: Harmonic radio frequency tag

13: Subject

F: RF signal

FH: incident harmonic signal

FN: Reflected harmonic signal

Claims (17)

A physiological information detection system, including: At least one radio frequency identification radar for transmitting radio frequency signals with a preset frequency; and Multiple harmonic radio frequency tags are respectively set on the subject, one of the harmonic radio frequency tags is turned on by the radio frequency identification radar and generates incident harmonic signals according to the radio frequency signal, which is projected to the corresponding subject to generate Corresponding reflected harmonic signal; The radio frequency identification radar demodulates the reflected harmonic signal to obtain physiological information of the corresponding subject, and identifies the subject according to the activated harmonic radio frequency tag. According to the physiological information detection system described in claim 1, wherein the radio frequency identification radar includes a master radio frequency identification unit and the harmonic radio frequency tag includes a slave radio frequency identification unit, the master radio frequency identification unit and the slave radio frequency identification The unit communicates to turn on the corresponding harmonic radio frequency tag. According to the physiological information detection system described in item 1 of the scope of patent application, the radio frequency identification radar includes: A transmitter for generating the radio frequency signal; A harmonic receiver for receiving the reflected harmonic signal; and A harmonic demodulator is used to demodulate the reflected harmonic signal to obtain a fundamental frequency signal. According to the physiological information detection system described in item 3 of the scope of patent application, the harmonic receiver includes a dual-band receiver, one of the frequency bands is used to receive the reflected harmonic signal, and the other frequency band is used to receive the radio frequency A reflected radio frequency signal that is transmitted to the subject and directly reflected back. According to the physiological information detection system described in item 3 of the scope of patent application, the radio frequency identification radar further includes: A processor that performs analog-to-digital conversion of the fundamental frequency signal and removes high-frequency components to obtain physiological information of the corresponding subject. According to the physiological information detection system described in item 1 of the scope of patent application, the harmonic radio frequency tag includes: When the resonance frequency of a harmonic transmitting antenna unit is the same as the frequency of the radio frequency signal, a resonance reaction is generated to generate the incident harmonic signal. According to the physiological information detection system described in item 1 of the scope of patent application, at least one subject is provided with multiple harmonic radio frequency tags. A physiological information detection system, including: A plurality of radio frequency tags are respectively set on the test subject, and when one of the radio frequency tags is turned on, an incident radio frequency signal with a preset frequency is generated, which is projected to the corresponding subject to generate a corresponding reflected radio frequency signal; and At least one radio frequency identification radar is used to turn on one of the radio frequency tags, demodulate the reflected radio frequency signal to obtain physiological information of the corresponding subject, and identify the subject according to the turned on radio frequency tag. According to the physiological information detection system described in item 8 of the patent application, the radio frequency identification radar includes a master radio frequency identification unit and the radio frequency tag includes a slave radio frequency identification unit, and the master radio frequency identification unit and the slave radio frequency identification unit perform Communication to turn on the corresponding radio frequency tag. According to the physiological information detection system described in item 8 of the scope of patent application, the radio frequency identification radar includes: A radio frequency receiver for receiving the reflected radio frequency signal; and A radio frequency demodulator is used to demodulate the reflected radio frequency signal to obtain a fundamental frequency signal. According to the physiological information detection system described in item 10 of the scope of patent application, the radio frequency identification radar further includes: A processor that performs analog-to-digital conversion of the fundamental frequency signal and removes high-frequency components to obtain physiological information of the corresponding subject. According to the physiological information detection system described in item 8 of the patent application, the at least one radio frequency identification radar includes a plurality of radio frequency demodulators for demodulating the reflected radio frequency signals of the predetermined frequencies. According to the physiological information detection system described in item 8 of the scope of patent application, at least one subject is provided with multiple radio frequency tags. A method for detecting physiological information, including: Perform radio frequency identification communication to open one of the plurality of radio frequency tags, which are respectively set on the subject; Generate incident radio frequency signals with preset frequencies; Project the incident RF signal to the corresponding subject to generate the corresponding reflected RF signal; Demodulate the reflected radio frequency signal to obtain physiological information of the corresponding subject; and Identify the subject according to the opened radio frequency tag. According to the physiological information detection method described in 14 items of the patent application, it further includes: Transmit the radio frequency signal of the preset frequency; The incident radio frequency signal is a harmonic signal generated by the resonance reaction of the radio frequency signal. According to the physiological information detection method described in the 14th patent application, the reflected radio frequency signal is demodulated to obtain a base frequency signal. According to the 16 physiological information detection methods described in the scope of the patent application, it further includes: The basic frequency signal is converted from analog to digital, and high frequency components are removed, and then the physiological information of the corresponding testee is obtained by calculation.

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