TWI690297B - Vital-sign detecting system and method - Google Patents

Abstract

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

Description

Physiological information detection system and method

The present invention relates to physiological information detection, in particular to a physiological information detection system and method that can identify the identity of a subject.

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

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 respiration rate. Because the cost of the detection system is not low, a detection system is usually used to measure multiple subjects. However, the corresponding signals of multiple subjects will 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, often resulting in recognition errors.

Therefore, there is an urgent need to propose a physiological information detection mechanism that can identify the subject's identity 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 propose a physiological information detection system and method, which can identify the identity of the subject and can 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 radar. The radio frequency tags are respectively provided to the subject and generate incident radio frequency signals of different preset frequencies, which are projected to the corresponding subject to generate corresponding reflected radio frequency signals. RF radar demodulate reflected RF To obtain the physiological information of the corresponding subject, and identify the subject according to the corresponding frequency of the reflected radio frequency signal.

100: physiological information detection system

100B: Physiological information detection system

100C: physiological information detection system

100D: physiological information detection system

700: physiological information detection system

700B: Physiological information detection system

700C: physiological information detection system

11: RF radar

11A: RF radar

11B: RF radar

111: transmitting antenna

112: receiving antenna

113: Adjustable frequency transmitter

114: Harmonic receiver

114B: Dual-band receiver

114C: Adjustable frequency receiver

115: Harmonic demodulator

115B: Demodulator

115C: Adjustable frequency demodulator

116: processor

117: Controller

12, 12A, 12B: Harmonic RF tags/RF tags

121: Harmonic emission antenna unit

122: RF transmitter

13: Subject

300: Physiological information detection method

31: Transmit RF signal of preset frequency

32: The tag generates the corresponding incident harmonic signal

33: Generate reflected harmonic signals

34: Receive, demodulate and process reflected harmonic signals to obtain physiological information

35: Integrate physiological information with corresponding tags and subjects

36: Determine whether there are other subjects

37: Select the resonance frequency of the next identity

800: Physiological information detection method

71: Transmit incident RF signal of preset frequency

72: RF radar selects the frequency of the tag

73: Receive reflected RF signal

74: Demodulate the reflected RF signal to obtain the fundamental frequency signal

75: Processing the fundamental frequency signal to obtain physiological information

76: Integrate physiological information with corresponding labels and subjects

77: determine whether there are other subjects

78: choose the frequency of the next identity

F1, F2, Fn, Fx: RF signal

FH1, FH2, FHn, FHx: incident harmonic signal/incident RF signal

FN1, FN2, FNn, FNx: reflected harmonic signal/reflected RF signal

FR1: reflected RF signal

T1, T2, Tn: time

The first figure shows a block diagram of the physiological information detection system of the first embodiment of the present invention.

The second figure shows a detailed block diagram of the detection system of the first figure.

FIG. 3A shows a flowchart of the physiological information detection method of the first embodiment of the present invention.

The third diagram B shows a block diagram of the detection system corresponding to the third diagram A.

The fourth figure shows a block diagram of a first variant detection system of the first embodiment of the invention.

The fifth figure shows a block diagram of a second variant detection system of the first embodiment of the invention.

The sixth figure shows a block diagram of a third variant detection system of the first embodiment of the invention.

The seventh figure shows a block diagram of a physiological information detection system according to a second embodiment of the invention.

Figure 8A shows a flowchart of a physiological information detection method according to a second embodiment of the invention.

Figure 8B shows a block diagram of the detection system corresponding to Figure 8A.

The ninth figure shows a block diagram of a first variant detection system of the second embodiment of the invention.

The tenth figure shows a block diagram of a second variant detection system of the second embodiment of the invention.

The first figure shows a block diagram of a physiological sign (vital sign) detection system 100 (hereinafter referred to as a detection system) according to the first embodiment of the present invention. In this embodiment, the detection system 100 may include a radio frequency (RF) radar 11, which may transmit a plurality of radio frequency signals of a predetermined frequency through the transmitting antenna 111. The detection system 100 may include a harmonic RF tag (harmonic RF tag) 12 (hereinafter referred to as a tag), which is respectively provided on the subject 13 (for example, worn on the chest of the subject 13) according to (different) A radio frequency signal of a preset frequency is used to generate a corresponding incident harmonic (radio frequency) signal. For example, when the tag 1 (12) receives the radio frequency signal F1 transmitted by the transmitting antenna 111, it can generate a corresponding incident harmonic signal FH1, such as a second harmonic signal (wherein the frequency of FH1 is F1 Twice). The incident harmonic signal FH1 is projected to the subject 13 to generate a reflected harmonic (RF) signal FN1, which is received by the RF radar 11 through the receiving antenna 112. The motion of the body of the subject 13 will modulate the incident harmonic signal to change its phase, so the RF radar 11 can learn the physiological information of the subject 13, such as breathing or heartbeat, by demodulating the reflected harmonic signal rate. Since the frequency of the RF signal induced by each tag 12 is different and the frequency of the incident harmonic signal generated is also different, the RF radar 11 can identify the subject 13 corresponding to the received reflected harmonic signal.

The second diagram shows a detailed block diagram of the detection system 100 of the first diagram, showing only one of the subjects 13 and the corresponding label 12. In this embodiment, the RF radar 11 may include an adjustable frequency transmitter 113 to generate an RF signal Fx of one of a plurality of preset frequencies within a preset frequency range, for example, by changing the inductance value and/or capacitance of the oscillation circuit value. The generated radio frequency signal Fx can be transmitted to the tag 12 through the transmitting antenna 111.

The tag 12 of this embodiment may include a harmonic transmission antenna unit 121, which generates a resonance reaction when the resonance frequency is the same as the frequency of the radio frequency signal Fx (of the transmission antenna 111) to generate a corresponding incident harmonic signal FHx, for example, two Subharmonic signal.

The radio frequency radar 11 of this embodiment may include a harmonic receiver 114, which receives the reflected harmonic signal FNx through the receiving antenna 112, and has the same frequency as the incident harmonic signal FHx, but the phase is subject to the movement of the body of the subject 13 Modified by.

The radio frequency radar 11 of this embodiment may include a harmonic demodulator 115 that demodulates the reflected harmonic signal FNx received by the (harmonic receiver 114) to obtain a baseband signal including phase change information . The radio frequency 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 from the harmonic demodulator 115) and removes high-frequency components, and after the operation, the physiological information of the subject 13 such as breathing or heart rate can be obtained. The aforementioned operation of removing high frequency components is performed by the digital signal processor, which may include removing inappropriate respiratory harmonics, removing noise, etc., but is not limited thereto. The radio frequency radar 11 of this embodiment may include a controller 117 for controlling the operations of the adjustable frequency transmitter 113, the harmonic receiver 114, the harmonic demodulator 115, and the processor 116. In this embodiment, as shown in the second figure, the adjustable frequency transmitter 113 is connected to the transmitting antenna 111 to transmit the radio frequency signal Fx, the harmonic receiver 114 is connected to the receiving antenna 112 to receive the reflected harmonic signal FNx, and the harmonic demodulator 115 is connected to the harmonic receiver 114 to demodulate the reflected harmonic signal FNx, the processor 116 is connected to the harmonic demodulator 115 to process the fundamental frequency signal.

The third diagram A shows a flowchart of the physiological information detection method 300 (hereinafter referred to as the detection method) of the first embodiment of the present invention, and the third diagram B shows a block diagram of the detection system 100 corresponding to the third diagram A. In step 31, at time T1, the adjustable frequency transmitter 113 of the radio frequency radar 11 transmits the radio frequency signal F1 of the preset frequency to the tag 12 through the transmitting antenna 111. The harmonic transmitting antenna unit 121 of the tag 1 (12) will resonate with the radio frequency signal F1 to generate the corresponding incident harmonic signal FH1 to the corresponding subject 13 (step 32). It is worth noting that the harmonic transmitting antenna unit 121 of other tags (12) will not resonate with the radio frequency signal F1, nor will it generate the corresponding incident harmonic signal FHx to its corresponding subject 13.

In step 33, the movement of the body of the subject 13 will modulate the incident harmonic signal FH1 to change its phase, thus generating the reflected harmonic signal FN1. In step 34, the harmonic receiver 114 of the radio frequency radar 11 receives the reflected harmonic signal FN1; then, the harmonic demodulator 115 of the radio frequency radar 11 demodulates the reflected harmonic signal FN1 to obtain a base containing phase change information Frequency signal; then the processor 116 of the RF radar 11 performs analog to digital conversion on the fundamental frequency signal containing the phase change information, and removes high frequency components, and after the arithmetic processing, the physiological information of the subject 13 is obtained, such as breathing or heartbeat rate.

Finally, in step 35, the obtained physiological information is integrated with the corresponding tag 12 and the subject 13, wherein the corresponding harmonic antenna element 121 (of the tag 12) and the radio frequency signal F1 have the same resonance frequency and can be used as an identity ( ID).

Next, if the RF radar 11 still has other subjects 13 to be detected (step 36), the RF radar 11 selects the resonance frequency of the next identity (step 37), and then repeats steps 31 to 35 at time T2. That is, the radio frequency signal F2 of the preset frequency is transmitted to the tag 12 (step 31), the corresponding incident harmonic signal FH2 is generated to the corresponding subject 13 (step 32), and the reflected harmonic signal FN2 is generated (step 33) to obtain The physiological information of the subject 13 (step 34), and integrate the obtained physiological information with the corresponding tag 12 and the subject 13 (step 35). If it is determined in step 36 that there is no other subject 13 to be detected by the RF radar 11, the process of the detection method 300 ends.

The fourth figure shows a block diagram of a first modified detection system 100B according to the first embodiment of the present invention. The difference from the detection system 100 shown in the third image B is that this embodiment (the fourth image) uses a plurality of (for example, two) radio frequency radars 11A, 11B, respectively corresponding to different tags 12 and the subject 13 . In this way, the radio frequency radars 11A and 11B can simultaneously recognize different identities. However, the first embodiment (Figure 3B) can only recognize a single identity at a time.

The fifth figure shows a block diagram of a second modified detection system 100C according to the first embodiment of the present invention. The difference from the detection system 100 shown in FIG. 3B is that in this embodiment (fifth figure), a plurality of (for example, two) tags 12A, 12B are provided on a single subject 13 and the tags 12A, 12B With different resonance frequencies. In this way, the radio frequency radar 11 can detect the complex physiological information of a single subject 13.

The sixth figure shows a block diagram of a third modified detection system 100D according to the first embodiment of the present invention. The difference from the detection system 100 shown in the second figure is that the radio frequency radar 11 of this embodiment (the sixth figure) uses a dual band receiver 114B instead of the harmonic receiver 114, and one of the frequency bands is the same In the second diagram, it is used to receive the reflected harmonic signal FN1. In addition, another frequency band is used to receive the reflected RF signal FR1 that is transmitted by the RF signal F1 to the subject 13 (but not the tag 12) and reflected back, and then demodulated by the demodulator 115B. In this way, the radio frequency radar 11 can detect the complex physiological information of a single subject 13 by time division multiplexing in the same time period.

The seventh figure shows a block diagram of a physiological information detection system 700 (hereinafter referred to as a detection system) according to a second embodiment of the invention. The second embodiment is similar to the first embodiment, and the differences are described below.

In this embodiment, the radio frequency tag 12 (hereinafter referred to as a tag) may include a radio frequency transmitter 122, which may emit an incident radio frequency signal FHx of a preset frequency, wherein different tags 12 will emit an incident radio frequency signal FHx of different frequencies. The incident radio frequency signal FHx is projected onto the subject 13 to generate a reflected radio frequency signal FNx, which is received by the radio frequency radar 11 through the receiving antenna 112. The movement of the body of the subject 13 will modulate the incident RF signal FHx to change its phase and reflect it as a reflected RF signal FNx. Therefore, the radio frequency radar 11 can obtain the physiological information of the subject 13 by demodulating the reflected radio frequency signal FNx, such as respiration or heart rate.

The radio frequency radar 11 of this embodiment may include an adjustable frequency receiver 114C (instead of the harmonic receiver 114 of the first embodiment) to receive the complex reflected radio frequency signal FNx within a preset frequency range. True The radio frequency radar 11 of the embodiment does not require the adjustable frequency transmitter 113 and the transmitting antenna 111 (of the first embodiment). The radio frequency radar 11 of this embodiment may include an adjustable frequency demodulator 115C, which can demodulate the received reflected radio frequency signal FNx within a preset frequency range.

Figure 8A shows a flowchart of a physiological information detection method 800 (hereinafter referred to as a detection method) according to a second embodiment of the present invention, and Figure 8B shows a block diagram of a detection system 700 corresponding to Figure 8A. In step 71, the tags 12 respectively transmit (different) incident radio frequency signals FHx (x is 1 to n) of a predetermined frequency to the corresponding subject 13. In step 72, the radio frequency radar 11 selects the frequency of one of the tags 12. The movement of the body of the subject 13 will modulate the incident radio frequency signal FHx to change its phase, thus generating a reflected radio frequency signal FNx (x is 1 to n).

In step 73, the adjustable frequency receiver 114C of the radio frequency radar n receives the reflected radio frequency signal FNx. Next, in step 74, the adjustable frequency demodulator 115C of the radio frequency radar 11 demodulates the reflected radio frequency signal FNx to obtain a fundamental frequency signal including phase change information. In step 75, the processor 116 of the radio frequency radar 11 performs analog-to-digital conversion on the fundamental frequency signal, and removes high-frequency components, and obtains the physiological information of the subject 13, such as breathing or heart rate, after the arithmetic processing.

Finally, in step 76, the obtained physiological information is integrated with the corresponding tag 12 and the subject 13, wherein the corresponding RF transmitter 122 (of the tag 12) and the adjustable frequency receiver 114C (of the RF radar 11) have the same Frequency can be used as an identification (ID).

Then, if the RF radar 11 still has other subjects 13 to be detected (step 77), the RF radar 11 (the adjustable frequency receiver 114C) selects the frequency of the next identity (step 78), and then repeats step 71 ~76. If it is determined in step 77 that there is no other subject 13 to be detected by the RF radar 11, the flow of the detection method 800 is ended.

The ninth figure shows a block diagram of a first modified detection system 700B of the second embodiment of the present invention. The difference from the detection system 700 shown in the eighth figure B is that this embodiment (the ninth figure) uses a plurality of (for example, two) radio frequency radars 11A, 11B, respectively corresponding to different tags 12 and the subject 13 . In this way, the radio frequency radars 11A and 11B can simultaneously recognize different identities. However, the second embodiment (Figure 8B) can only recognize a single identity at a time.

The tenth figure shows a block diagram of a second modified detection system 700C according to the second embodiment of the present invention. The difference from the detection system 700 shown in the seventh figure is that in this embodiment (the tenth figure), a plurality of (for example, two) tags 12A, 12B are provided on a single subject 13, and the tags 12A, 12B have Different frequencies. In this way, the radio frequency radar 11 can detect the complex physiological information of a single subject 13.

The above are only the preferred embodiments of the present invention and are not intended to limit the scope of the patent application 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

11: RF radar

111: transmitting antenna

112: receiving antenna

12: Harmonic RF tags

13: Subject

F1, F2, Fn: RF signal

FH1, FH2, FHn: incident harmonic signal

FN1, FN2, FNn: reflected harmonic signal

Claims (16)

A physiological information detection system, comprising: at least one radio frequency radar for transmitting radio frequency signals with different preset frequencies; and complex harmonic radio frequency tags, which are respectively provided to the subject, and the harmonic radio frequency tags are respectively based on The RF signals generate corresponding incident harmonic signals, which are projected to the corresponding subjects to generate corresponding reflected harmonic signals; wherein the RF radar demodulates the reflected harmonic signals to obtain physiological information of the corresponding subjects, and According to the corresponding frequency of the reflected harmonic signal to identify the subject. The physiological information detection system according to item 1 of the patent application scope, wherein the radio frequency radar includes: an adjustable frequency transmitter that generates the radio frequency signal of one of the preset frequencies within a preset frequency range; A harmonic receiver is used to receive the reflected harmonic signal; and a harmonic demodulator is used to demodulate the reflected harmonic signal to obtain a fundamental frequency signal. The physiological information detection system according to item 2 of the patent application scope, wherein the harmonic receiver includes a dual-band receiver, one of which is used to receive the reflected harmonic signal and the other is used to receive the radio frequency The reflected RF signal that the signal is transmitted to the subject and reflected directly back. The physiological information detection system according to item 2 of the patent application scope, wherein the radio frequency radar further includes: a processor which performs analog to digital conversion on the fundamental frequency signal, and removes high frequency components, and obtains corresponding results through calculation Subject's physiological information. According to the physiological information detection system described in item 1 of the patent application scope, wherein the harmonic radio frequency tag includes: a harmonic transmitting antenna unit, when the resonance frequency is the same as the frequency of the radio frequency signal, a resonance reaction occurs to Generate corresponding incident harmonic signals. According to the physiological information detection system described in item 1 of the patent application scope, wherein the at least one radio frequency radar includes a plurality of radio frequency radars for transmitting radio frequency signals of the predetermined frequencies. According to the physiological information detection system described in item 1 of the patent application scope, at least one subject is provided with a plurality of the harmonic radio frequency tags. A physiological information detection system, comprising: a plurality of radio frequency tags, which are respectively set in a subject, the radio frequency tags generate incident radio frequency signals of different preset frequencies, which are projected to the corresponding subject to generate corresponding reflected radio frequency signals; And at least one radio frequency radar, used to demodulate the reflected radio frequency signal to obtain physiological information of the corresponding subject, and identify the subject according to the corresponding frequency of the reflected radio frequency signal. The physiological information detection system according to item 8 of the patent application scope, wherein the radio frequency radar includes: an adjustable frequency receiver that receives the reflected radio frequency signal of one of the preset frequencies within a preset frequency range; And an adjustable frequency demodulator for demodulating the reflected radio frequency signal to obtain the fundamental frequency signal. According to the physiological information detection system described in item 9 of the patent application scope, the radio frequency radar further includes: A processor performs analog-to-digital conversion on the fundamental frequency signal, removes high-frequency components, and operates to obtain physiological information of the corresponding subject. The physiological information detection system according to item 8 of the patent application scope, wherein the at least one radio frequency radar includes a plurality of radio frequency radars for demodulating the incident radio frequency signals of the predetermined frequencies. According to the physiological information detection system described in item 8 of the patent application scope, at least one subject is provided with a plurality of the radio frequency tags. A physiological information detection method, comprising: a plurality of radio frequency tags generating a plurality of incident radio frequency signals of different preset frequencies; projecting the incident radio frequency signal to a corresponding subject to generate a corresponding reflected radio frequency signal; at least one radio frequency radar demodulating the reflected radio frequency The signal to obtain the physiological information of the corresponding subject; and the at least one radio frequency radar identifies the subject according to the corresponding frequency of the reflected radio frequency signal. The physiological information detection method according to item 13 of the patent application scope further includes: transmitting radio frequency signals of the preset frequencies; wherein the incident radio frequency signal is a harmonic signal generated by resonance reaction of the radio frequency signal. According to the physiological information detection method described in item 13 of the patent application range, the reflected radio frequency signal is demodulated to obtain a fundamental frequency signal. According to the physiological information detection method described in item 15 of the patent application, it further includes: performing analog to digital conversion on the fundamental frequency signal, removing high-frequency components, and calculating to obtain physiological information of the corresponding subject.

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