Signal receiving device, signal identification system and method

Abstract

A signal receiving device includes a first receiving circuit, a second receiving circuit, a third receiving circuit and a light emitting device. The first receiving circuit is configured to receive a first electromagnetic wave and obtain a first signal according to the first electromagnetic wave, the first electromagnetic wave being an electromagnetic wave generated by modulating the first signal onto a first carrier. The second receiving circuit is coupled to the first receiving circuit and configured to amplify an amplitude of the first signal output by the first receiving circuit to obtain a second signal. The third receiving circuit is configured to receive a third signal and output a fourth signal. The light emitting device is coupled between the second receiving circuit and the third receiving circuit and configured to be in an extinguished state when the second signal is the same as the fourth signal, and in a light emitting state when the second signal is different from the fourth signal.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of signal identification, and in particular, to a signal receiving device, a signal identification system and a method. BACKGROUND

[0002] In order to identify the electromagnetic signal, an inductor can be coupled to a light emitting device, when the inductor senses the electromagnetic signal, the inductor can generate a driving current to drive the light emitting device to emit light. By identifying the light and dark of the light emitting device, it can be determined whether there is an electromagnetic signal. SUMMARY

[0003] In one aspect, a signal receiving device is provided, the signal receiving device comprising a first receiving circuit, a second receiving circuit, a third receiving circuit and a light emitting device. The first receiving circuit is configured to receive a first electromagnetic wave and obtain a first signal according to the first electromagnetic wave, the first electromagnetic wave being an electromagnetic wave generated by modulating the first signal onto a first carrier. The second receiving circuit is coupled to the first receiving circuit and configured to amplify the amplitude of the first signal output by the first receiving circuit to obtain a second signal. The third receiving circuit is configured to receive a third signal and output a fourth signal. The light emitting device is coupled between the second receiving circuit and the third receiving circuit and configured to be in an extinguished state when the second signal is the same as the fourth signal, and in a light emitting state when the second signal is different from the fourth signal.

[0004] In some embodiments, the second receiving circuit is further configured to receive the third signal.

[0005] In some embodiments, the second receiving circuit comprises a plurality of levels of sub-receiving circuits connected in series, each sub-receiving circuit comprising an amplifying device, a first inductor and a rectifying device. The amplifying device is coupled to the first receiving circuit and configured to amplify the amplitude of the first signal output by the first receiving circuit. The first inductor is coupled to the amplifying device and configured to receive the third signal and supply power to the amplifying device. The rectifying device is coupled between the amplifying device and the first inductor and configured to rectify the induced current generated by the first inductor.

[0006] In some embodiments, the inductance values of the inductors in the plurality of levels of sub-receiving circuits connected in series increase step by step.

[0007] In some embodiments, the amplifying device is an amplifier or an inverter.

[0008] In some embodiments, the first signal and the third signal have the same frequency, and the first signal and the third signal have the same phase or opposite phase.

[0009] In some embodiments, when the phase of the first signal is the same as the phase of the third signal, the second receiving circuit includes an even number of inverters; when the phase of the first signal is opposite to the phase of the third signal, the second receiving circuit includes an odd number of inverters.

[0010] In some embodiments, the third receiving circuit includes a second inductor, and the inductance of the second inductor is greater than the inductance of the first inductor.

[0011] In some embodiments, the inductance of the first inductor in the last stage of the multi-stage sub-receiving circuit is the same as the inductance of the second inductor.

[0012] In another aspect, a signal identification system is provided, including a signal transmitting device and the signal receiving device of any one of the above embodiments, wherein the signal transmitting device includes a first transmitting circuit and a second transmitting circuit. The first transmitting circuit is configured to modulate the first signal onto a first carrier to generate a first electromagnetic wave; and the second transmitting circuit is configured to emit a third signal.

[0013] In some embodiments, the frequency range of the first signal is 1 kHz to 20 kHz.

[0014] In some embodiments, the first receiving circuit includes a first antenna, and the first transmitting circuit includes a second antenna, and the frequencies of the first antenna and the second antenna are the same or similar.

[0015] In some embodiments, the center frequency of the first antenna and the second antenna is greater than or equal to 100 MHz.

[0016] In another aspect, a signal identification method is provided, applied to the signal identification system of any one of the above embodiments, and the method includes:

[0017] The first receiving circuit receives the first electromagnetic wave from the first transmitting circuit, and obtains the first signal according to the first electromagnetic wave, and the first transmitting circuit is configured to modulate the first signal onto a first carrier to generate the first electromagnetic wave.

[0018] The second receiving circuit amplifies the amplitude of the first signal output by the first receiving circuit to obtain a second signal.

[0019] The third receiving circuit receives the third signal from the second transmitting circuit and outputs a fourth signal; wherein when the second signal is the same as the fourth signal, the light-emitting device is in an extinguished state; and when the second signal is different from the fourth signal, the light-emitting device is in a light-emitting state. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present disclosure, the drawings needed to be used in some embodiments of the present disclosure will be briefly introduced as follows. Obviously, the drawings in the following description are only some drawings of the embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art according to these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams, and are not limited to the actual size, actual process, actual time sequence, etc. of the product, method, signal, etc. involved in the embodiments of the present disclosure.

[0021] Figure 1 A structural block diagram of a signal recognition system according to some embodiments;

[0022] Figure 2 A structural block diagram of another signal recognition system according to some embodiments;

[0023] Figure 3 A circuit diagram of a signal recognition system according to some embodiments;

[0024] Figure 4 A circuit diagram of another signal recognition system according to some embodiments;

[0025] Figure 5 A circuit diagram of yet another signal recognition system according to some embodiments;

[0026] Figure 6 A flowchart of a signal recognition method according to some embodiments and a circuit diagram of a second receiving circuit. DETAILED DESCRIPTION

[0027] The technical solutions in some embodiments of the present disclosure will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are only some of the embodiments of the present disclosure, but not all the embodiments. Based on the embodiments provided in the present disclosure, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present disclosure.

[0028] Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise," "comprising," and the like are to be construed in an open, inclusive sense, as opposed to a closed or exclusive sense, so that, for example, the term "comprising" will be understood to mean "including but not limited to." In the description of the specification, the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific example" or "some examples" are not necessarily referring to the same embodiment or example. Furthermore, the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific example" or "some examples" can be referring to one or more embodiments or examples.

[0029] Hereinafter, the terms "first", "second", etc. are used only for the purpose of description and are not to be construed as indicating or implying relative importance or implying a specific number of technical features indicated. Thus, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0030] In describing some embodiments, the expressions "coupled" and "connected" and their derivatives can be used. For example, the term "connected" can be used to describe some embodiments in which two or more components are in direct physical or electrical contact with each other. As another example, the term "coupled" can be used to describe some embodiments in which two or more components are in direct physical or electrical contact with each other. However, the terms "coupled" or "communicatively coupled" can also mean that two or more components are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content herein.

[0031] "A, B, and C at least one of" has the same meaning as "at least one of A, B, or C", and includes the following combinations of A, B, and C: only A, only B, only C, a combination of A and B, a combination of A and C, a combination of B and C, and a combination of A, B, and C.

[0032] "A and / or B" includes the following three combinations: only A, only B, and a combination of A and B.

[0033] As used herein, the term "if' is, optionally, interpreted as meaning "when" or "while" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [stated condition or event] is detected" is, optionally, interpreted as meaning "upon determining" or "in response to determining" or "upon detecting [stated condition or event]" or "in response to detecting [stated condition or event]," depending on the context.

[0034] Use of "adapted to" or "configured to" herein means open and inclusive language that does not exclude devices that are adapted to or configured to perform additional tasks or steps.

[0035] Additionally, use of "based on" means open and inclusive, as a process, step, calculation, or other action "based on" one or more conditions or values can be based on additional conditions or values in practice.

[0036] As used herein, "about" or "approximately" includes the recited value and the average value within an acceptable range of deviation from the particular value, as determined by one of ordinary skill in the art considering the measurement at issue and the error in measurement associated with the particular quantity being measured (i.e., the limitations of the measurement system).

[0037] Exemplary embodiments are described herein with reference to cross-sectional and / or plan view illustrations that are idealized examples. In the interest of clarity, not all of the layer and regions are shown in each figure nor is every structure necessarily shown. With regard to the regions, the thicknesses are exaggerated for clarity. Accordingly, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and / or tolerances, are to be expected. Thus, the exemplary embodiments should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result from, for example, manufacturing. For example, an etched region illustrated as a rectangle will, typically, have rounded or curved features. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region of a device and are not intended to limit the scope of the exemplary embodiments.

[0038] Generally, the method of identifying the electromagnetic signal is to couple an inductor (may also be referred to as a coil) to the light-emitting device, when the inductor senses the electromagnetic signal, the inductor can generate a driving current to drive the light-emitting device to emit light, by identifying the light-emitting device to be bright or dark, it can be determined whether there is an electromagnetic signal.

[0039] Since the inductor has poor discrimination ability for electromagnetic signals with low frequency, in a low frequency range, such as a frequency range of 1 kHz-20 kHz, the receiving efficiency of electromagnetic signals with different frequencies on the same inductor is close, and thus the technology of coupling the light-emitting device with the inductor to identify electromagnetic signals can only distinguish whether there is an electromagnetic signal or not, and cannot further distinguish electromagnetic signals with specific frequencies. For example, when the inductor senses an electromagnetic signal with a frequency of 12 kHz, the brightness of the light-emitting device is a first brightness, and when the inductor senses an electromagnetic signal with a frequency of 18 kHz, the brightness of the light-emitting device is a second brightness. Since the receiving efficiency of electromagnetic signals with different frequencies on the same inductor is close, the first brightness and the second brightness differ little, and thus the first brightness and the second brightness cannot be distinguished. That is, if the target is to identify an electromagnetic signal with a frequency of 12 kHz, the above method cannot accurately identify whether the electromagnetic signal sensed by the inductor is an electromagnetic signal with a frequency of 12 kHz or an electromagnetic signal with a frequency of 18 kHz.

[0040] Meanwhile, since the above method has low requirements for the center frequency of the inductor when identifying electromagnetic signals, the receiving end is more likely to be forged. For example, a first receiving end is set to receive an electromagnetic signal with a frequency of 12 kHz, and a second receiving end is set to receive an electromagnetic signal with a frequency of 18 kHz. Since the first brightness and the second brightness cannot be distinguished, the first receiving end and the second receiving end cannot be distinguished, that is, the first receiving end can be forged as the second receiving end, and the second receiving end can also be forged as the first receiving end.

[0041] To solve the above problems, some embodiments of the present disclosure provide a signal identification system, as shown in Figure 1 The signal identification system includes a signal receiving device 100, wherein the signal receiving device 100 includes a first receiving circuit 101, a second receiving circuit 102, a third receiving circuit 103, and a light-emitting device 104.

[0042] The first receiving circuit 101 is configured to receive a first electromagnetic wave S0 and obtain a first signal S1 according to the first electromagnetic wave S0. The first electromagnetic wave S0 is an electromagnetic wave generated by modulating the first signal S1 onto a first carrier.

[0043] In some embodiments, as shown in Figure 2 The signal identification system further includes a signal transmitting device 200, and the signal transmitting device 200 includes a first transmitting circuit 201. The first transmitting circuit 201 is configured to modulate the first signal S1 onto a first carrier to generate the first electromagnetic wave S0. That is, the first receiving circuit 101 can receive the first electromagnetic wave S0 from the first transmitting circuit 201.

[0044] In some embodiments, as shown in Figure 3As shown, the first receiving circuit 101 comprises a first antenna A1 and a filtering device, and the filtering device can be a diode L0 exemplarily. The first transmitting circuit 201 comprises a second antenna A0, and the frequencies of the first antenna A1 and the second antenna A0 are the same or similar. Exemplarily, the frequencies of the first antenna A1 and the second antenna A0 are similar means that the difference between the frequency of the first antenna A1 and the frequency of the second antenna A0 is less than or equal to 10 MHz. That is, when the frequencies of the first antenna A1 and the second antenna A0 are within the range of 10 MHz, the first antenna A1 and the second antenna A0 can transmit signals. Moreover, when the frequencies of the first antenna A1 and the second antenna A0 are the same or similar, the efficiency of signal transmission between the first antenna A1 and the second antenna A0 is higher, that is, the signal emitted by the second antenna A0 can be received by the first antenna A1 to the greatest extent, and the distortion of the data received by the first antenna A1 can be avoided as much as possible.

[0045] For example, when the center frequency of the second antenna A0 is 100 MHz, if the frequency of the first antenna A1 is within the range of 95 MHz to 105 MHz, the frequencies of the first antenna A1 and the second antenna A0 are the same or similar, and the first antenna A1 and the second antenna A0 can transmit signals.

[0046] In some embodiments, the frequencies of the first antenna A1 and the second antenna A0 are greater than or equal to 100 MHz. Exemplarily, when the frequencies of the first antenna A1 and the second antenna A0 are 100 MHz, the second antenna A0 modulates the first signal S1 to the first carrier of 100 MHz to generate the first electromagnetic wave S0. As shown, Figure 3 As shown, the second antenna A0 emits the first electromagnetic wave S0, and the first antenna A1 receives the first electromagnetic wave S0 and outputs the first electromagnetic wave S0 to the filtering device. After the filtering device processes the first electromagnetic wave S0, the first signal S1 is obtained.

[0047] As shown, Figures 1 to 3 The second receiving circuit 102 is coupled to the first receiving circuit 101 and configured to amplify the amplitude of the first signal S1 output by the first receiving circuit 101 to obtain a second signal S2. In some embodiments, as shown, Figure 2 and Figure 3 As shown, the second receiving circuit 102 is also configured to receive a third signal S3 to generate a current. It can be understood that the current can power the electronic elements of the second receiving circuit 102, that is, the second receiving circuit 102 does not need to additionally access an external power supply, so that the size of the signal identification system can be reduced and a flexible system can be realized.

[0048] In some embodiments, as shown, Figure 2As shown, the signal transmitting device 200 further comprises a second transmitting circuit 202 configured to emit the third signal S3. That is, the second receiving circuit 102 can receive the third signal S3 from the second transmitting circuit 202.

[0049] As shown, the third receiving circuit 103 is configured to receive the third signal S3 from the second transmitting circuit 202 and output a fourth signal S4. Based on the principle of electromagnetic induction, the fourth signal S4 has the same phase as the third signal S3, and the amplitude of the fourth signal S4 can be the same as or different from that of the third signal S3. Figure 1 Figure 2 As shown, the third receiving circuit 103 is configured to receive the third signal S3 from the second transmitting circuit 202 and output a fourth signal S4. Based on the principle of electromagnetic induction, the fourth signal S4 has the same phase as the third signal S3, and the amplitude of the fourth signal S4 can be the same as or different from that of the third signal S3.

[0050] In some embodiments, as shown in Figure 3 The second transmitting circuit 202 comprises an inductor H0, and the third receiving circuit 103 comprises a second inductor Ht. When the inductor H0 transmits the third signal S3, the second inductor Ht can induce the third signal S3 due to electromagnetic induction between the inductors, and output the fourth signal S4, while generating a current that can power the light emitting device 104 to make the light emitting device 104 emit light.

[0051] In some embodiments, the first signal S1 and the third signal S3 have the same frequency, and the first signal S1 and the third signal S3 have the same or opposite phase. Figure 3 Figure 4 For example, the first signal S1 and the third signal S3 have the same frequency, and the first signal S1 and the third signal S3 have the same phase. In actual applications, the first signal S1 and the third signal S3 can also have opposite phases, i.e., the first signal S1 and the third signal S3 have a phase difference of 180°.

[0052] As shown, the light emitting device 104 is coupled between the second receiving circuit 102 and the third receiving circuit 103, and is configured to be in an extinguished state when the second signal S2 and the fourth signal S4 are the same, and be in a light emitting state when the second signal S2 and the fourth signal S4 are different. Figure 1 Figure 2 For example, when the second signal S2 and the fourth signal S4 are the same, the light emitting device 104 is always in an extinguished state. When the second signal S2 and the fourth signal S4 are different, the light emitting device 104 is always in a light emitting state, or the light emitting device 104 is in a high-frequency flickering state. It can be understood that when the light emitting device 104 is in a high-frequency flickering state, the light emitting device 104 switches between the light emitting state and the extinguished state at a high frequency.

[0053] For example, when the second signal S2 and the fourth signal S4 are the same, the light emitting device 104 is always in an extinguished state. When the second signal S2 and the fourth signal S4 are different, the light emitting device 104 is always in a light emitting state, or the light emitting device 104 is in a high-frequency flickering state. It can be understood that when the light emitting device 104 is in a high-frequency flickering state, the light emitting device 104 switches between the light emitting state and the extinguished state at a high frequency.​​​

[0054] As shown in Figure 3 , the light emitting device 104 can be an Organic Light-Emitting Diode (OLED), a Quantum Dot Light Emitting Diode (QLED), or an Active-Matrix Organic Light Emitting Diode (AMOLED). The embodiments of the present application do not make special restrictions on the specific type of the light emitting device 104. The following embodiments take the OLED as an example for detailed description. The anode of the light emitting diode OLED is coupled to the second inductor Ht, and the cathode of the light emitting diode OLED is coupled to the output terminal of the second receiving circuit 102. Due to the structural characteristics of the light emitting diode OLED, the light emitting diode OLED has a current or voltage threshold. For example, when the voltage difference across the light emitting diode OLED is greater than or equal to the threshold voltage, the light emitting diode OLED emits light; when the voltage difference across the light emitting diode OLED is less than the threshold voltage, the light emitting diode OLED is extinguished. It can be understood that when the phases of the second signal S2 and the fourth signal S4 are the same, and the amplitude difference between the second signal S2 and the fourth signal S4 is less than the threshold voltage of the light emitting diode OLED, the light emitting diode OLED is extinguished. That is, the above-mentioned second signal S2 and fourth signal S4 being the same can include the amplitude of the second signal S2 and the fourth signal S4 being exactly the same, or the amplitude of the second signal S2 and the fourth signal S4 being almost the same (for example, the amplitude difference between the second signal S2 and the fourth signal S4 is less than the threshold voltage of the light emitting diode OLED).

[0055] As shown in Figure 2 and Figure 3 , when there is a current passing through the inductor H0, based on the principle of electromagnetic induction, the third signal S3 will be generated inside and around the inductor H0, and the second inductor Ht will generate a current after sensing the third signal S3. The current can drive the light emitting diode OLED to emit light and output the fourth signal S4 to the anode of the light emitting diode OLED. At this time, the second signal S2 can not have been generated, so there will be a voltage difference between the anode and the cathode of the light emitting diode OLED, and the light emitting diode OLED will emit light. When the second signal S2 has been generated and is the same as the fourth signal S4, there is no voltage difference (or the voltage difference is less than the threshold voltage of the light emitting diode OLED) between the anode and the cathode of the light emitting diode OLED, and the light emitting diode OLED will be extinguished.

[0056] It can be understood that the signal identification system provided by the embodiment of the present disclosure receives the first electromagnetic wave signal S0 through the first receiving circuit 101 and obtains the first signal S1, the second receiving circuit 102 amplifies the first signal S1 to obtain the second signal S2, the third receiving circuit 103 receives the third signal S3 and obtains the fourth signal S4, and the frequency of the first signal S1 is the same as that of the third signal S3. Therefore, when the light-emitting diode OLED is extinguished, it indicates that the second signal S2 is the same as the fourth signal S4, and at this time, the signal identification system can identify the frequency of the first signal or the third signal. That is, when the first signal S1 and the third signal S3 with the same frequency are both emitted and received, it is possible to make the second signal S2 the same as the fourth signal S4, and at this time, the light-emitting diode OLED is extinguished. When the light-emitting diode OLED is extinguished, the signal identification system of the embodiment of the present disclosure can identify the signal of a specific frequency (i.e., the frequency of the first signal or the third signal).

[0057] In some embodiments, as shown in Figure 2 The second receiving circuit 102 includes a plurality of levels of sub-receiving circuits connected in series, and the plurality of levels of sub-receiving circuits include a first level of sub-receiving circuits 1021, a second level of sub-receiving circuits 1022, …, and an n level of sub-receiving circuits 102n, n is an integer greater than or equal to 3. The number of the plurality of levels of sub-receiving circuits included in the second receiving circuit 102 is not limited by the embodiment of the present disclosure.

[0058] Each level of sub-receiving circuits is configured to amplify the amplitude of the first signal S1, and the plurality of levels of sub-receiving circuits are configured to amplify the amplitude of the first signal S1 step by step. For example, as shown in Figure 2 and Figure 3 The first level of sub-receiving circuits 1021 is configured to amplify the amplitude of the first signal S1 to obtain a first level of amplified signal S11, and output the first level of amplified signal S11 to the second level of sub-receiving circuits 1022. The second level of sub-receiving circuits 1022 is configured to amplify the first level of amplified signal S11 to obtain a second level of amplified signal S12, and output the second level of amplified signal S12 to the third level of sub-receiving circuits 1023. In this way, the n level of sub-receiving circuits 102n is configured to amplify the n-1 level of amplified signal to obtain the n level of amplified signal, and output the n level of amplified signal. The n level of amplified signal is the second signal S2. Compared with the way of amplifying the first signal S1 once to obtain the second signal S2, the way of amplifying the first signal S1 step by step through the plurality of levels of sub-receiving circuits is more controllable, and each level of sub-receiving circuits can set a suitable amplification multiple, so that the output second signal S2 is more stable.

[0059] In some embodiments, the amplification factors of different sub-receiving circuits in the multi-stage sub-receiving circuits included in the second receiving circuit 102 can be the same, different, or partially the same, and the present disclosure does not limit this.

[0060] In some embodiments, the amplification factor of each sub-receiving circuit can be 3-5 times, i.e., each sub-receiving circuit can amplify the received signal by 3-5 times before output. The present disclosure does not limit the amplification factor of each sub-receiving circuit, and the amplification factor of each sub-receiving circuit is related to the inductance value of the inductor in each sub-receiving circuit. In actual applications, the amplification factor of each sub-receiving circuit can be set according to different application scenarios.

[0061] In some embodiments, as shown in Figure 2 and Figure 3 , each sub-receiving circuit includes an amplification device Ix (e.g., I1, I2…In), a first inductor Hx (e.g., H1, H2…Hn), and a rectifier device Lx (e.g., L1, L2…Ln). The amplification device Ix is coupled to the first receiving circuit 101 and is configured to amplify the amplitude of the first signal S1 output by the first receiving circuit 101. The first inductor Hx is coupled to the amplification device Ix and is configured to receive the third signal S3 from the second transmitting circuit 202 and generate a current to power the amplification device Ix. The rectifier device Lx is coupled between the amplification device Ix and the first inductor Hx and is configured to rectify the current generated by the first inductor Hx.

[0062] Exemplarily, the amplification device can be an inverter. As shown in Figure 3 , the amplification device Ix includes an inverter I1, an inverter I2, …, or an inverter In. The first inductor Hx includes a first inductor H1, a first inductor H2, …, or a first inductor Hn. The rectifier device Lx includes a rectifier device L1, a rectifier device L2, …, or a rectifier device Ln. In some embodiments, the inductor H0 can also be referred to as a transmitting coil, and the first inductor Hx (e.g., H1, H2…Hn) and the second inductor Ht can also be referred to as receiving coils.

[0063] As shown in Figure 3As shown, the first terminal of inverter I1 in the first-stage sub-receiving circuit 1021 is coupled to the output terminal of the first receiving circuit 101, the second terminal of inverter I1 in the first-stage sub-receiving circuit 1021 is coupled to the first terminal of inverter I2 in the second-stage sub-receiving circuit 1022, the third terminal of inverter I1 in the first-stage sub-receiving circuit 1021 is coupled to one end of the first inductor H1, the other end of the first inductor H1 is coupled to one end of the rectifier L1, and the other end of the rectifier L1 is coupled to the fourth terminal of inverter I1 in the first-stage sub-receiving circuit 1021. The second terminal of inverter I2 in the second-stage sub-receiving circuit 1021 is coupled to the first terminal of inverter I3 in the third-stage sub-receiving circuit 1023. The third terminal of inverter I2 in the second-stage sub-receiving circuit 1022 is coupled to one end of the first inductor H2. The other end of the first inductor H2 is coupled to one end of the rectifier L2. The other end of the rectifier L2 is coupled to the fourth terminal of inverter I1 in the second-stage sub-receiving circuit 1021. The connection methods of the amplification device Ix, the first inductor Hx, and the rectifier Lx in the other sub-receiving circuits are similar to those of the first-stage sub-receiving circuit 1021 and the second-stage sub-receiving circuit 1022, and will not be described again here.

[0064] For example, the structure of an inverter can be implemented using low-temperature polysilicon (LTPS) thin-film transistors (e.g., p-type transistors, n-type transistors), indium gallium zinc oxide (IGZO) thin-film transistors or other oxide thin-film transistors (TFTs) (e.g., n-type transistors), amorphous silicon TFTs (e.g., n-type transistors), carbon nanotubes (e.g., p-type transistors), two-dimensional materials (e.g., p-type transistors, n-type transistors), etc. This disclosure does not limit the specific structure of the inverter.

[0065] In some embodiments, such as Figure 4 As shown, the amplification device may also include an amplifier. When the amplification device includes an amplifier, the amplifier does not switch the phase of the first signal S1 when amplifying the amplitude of the first signal S1. Therefore, the phases of the first signal S1 and the third signal S3 must be the same to ensure the normal operation of the signal recognition system. Moreover, the number of amplifiers can be even or odd; this embodiment does not limit the number of amplifiers. In practical applications, the number can be set according to different application scenarios. Compared with an amplifier, an inverter has higher power requirements, while an inverter has simpler power requirements; a DC power supply can drive an inverter. Therefore, when the amplification device is an inverter, it is easier to realize a flexible system. The following embodiments use an inverter as an example for illustration.

[0066] When the inductor H0 in the second transmitting circuit 202 emits the third signal S3, due to electromagnetic induction between the inductors, the first inductor H1, the first inductor H2, …, and the first inductor Hn in each sub-receiving circuit can induce the third signal S3 and generate an induced current to supply power to the inverter I1, the inverter I2, …, and the inverter In in each sub-receiving circuit, respectively. Therefore, the second receiving circuit 102 does not need an external power supply.

[0067] In some embodiments, in order to ensure that the amplification factor of the amplifying device is gradually increased, the inductance values of the first inductor H1, the first inductor H2, …, and the first inductor Hn can be gradually increased. That is, the inductance value of the first inductor H1 is less than the inductance value of the first inductor H2, …, and the inductance value of the first inductor Hn-1 is less than the inductance value of the first inductor Hn. The inductance values of the first inductor H1, the first inductor H2, …, and the first inductor Hn are not limited in the embodiments of the present disclosure, and in actual applications, the inductance values of each first inductor can be set according to different application scenarios.

[0068] In some embodiments, the inductance value of the second inductor Ht is greater than the inductance value of each first inductor Hx in the sub-receiving circuit. That is, the inductance value of the second inductor Ht is greater than the inductance value of the first inductor H1, the first inductor H2, …, and the first inductor Hn. Since the light-emitting diode OLED is extinguished only when the second signal S2 is the same as the fourth signal S4, the second signal S2 is obtained by multiple-stage amplification of the first signal S1 by the multiple first inductors Hx, and the fourth signal S4 is obtained directly by the second inductor Ht in response to the third signal S3. Only when the inductance value of the second inductor Ht is greater than the inductance value of the first inductor H1, the first inductor H2, …, and the first inductor Hn, can the second signal S2 be the same as the fourth signal S4. The inductance value of the second inductor Ht can be derived according to the inductance values of the first inductor H1, the first inductor H2, …, and the first inductor Hn in the multiple-stage sub-receiving circuit, and the inductance values of the first inductor H1, the first inductor H2, …, and the first inductor Hn and the second inductor Ht are not limited in the present disclosure. In actual applications, the inductance value of the second inductor Ht can be set according to different application scenarios.

[0069] In some embodiments, the inductance value of the first inductor Hn in the last-stage sub-receiving circuit in the multiple-stage sub-receiving circuit can be the same as the inductance value of the second inductor Ht. For example, as shown in FIG. 2, the inductance value of the first inductor Hn is the same as the inductance value of the second inductor Ht. Figure 3As shown, the inductance value of the first inductor Hn can be the same as that of the second inductor Ht, so as to ensure that the amplitude of the second signal S2 is not much different from that of the fourth signal S4. In this way, when the first signal S1 and the third signal S3 with the same frequency are transmitted and received, the second signal S2 and the fourth signal S4 have the same phase and the amplitude is not much different, so as to ensure that the light-emitting diode OLED is always in an extinguished state, thereby more accurately identifying the signal of a specific frequency (i.e. the frequency of the first signal or the third signal).

[0070] Exemplarily, as Figure 3 shown, in each stage of the sub-receiving circuit, the current generated by each first inductor is rectified by a diode and then flows to the inverter, so as to provide stable current for the inverter.

[0071] As Figure 3 shown, the working principle of the second receiving circuit 102 is as follows:

[0072] The first receiving circuit 101 outputs the first signal S1. In the first stage of the sub-receiving circuit 1021, the first inductor H1 senses the third signal S3 and generates a current, which flows to the inverter I1 via the diode L1 and drives the inverter I1 to amplify the amplitude of the first signal S1, converts the phase of the first signal S1 to the opposite phase, obtains the first stage of the amplified signal S11, and outputs the first stage of the amplified signal S11 to the input end of the inverter I2. In the second stage of the sub-receiving circuit 1022, the first inductor H2 senses the third signal S3 and generates a current, which flows to the inverter I2 via the diode L2 and drives the inverter I2 to amplify the amplitude of the first stage of the amplified signal S11, converts the phase of the first signal S1 to the opposite phase to obtain the second stage of the amplified signal S12, and outputs the second stage of the amplified signal S12 to the input end of the inverter I3. In this way, in the nth stage of the sub-receiving circuit 102n, the first inductor Hn senses the third signal S3 and generates a current, which flows to the inverter In via the diode Ln and drives the inverter In to amplify the amplitude of the (n-1)th stage of the amplified signal S1n-1, converts the phase of the first signal S1 to the opposite phase to obtain the nth stage of the amplified signal, and outputs the nth stage of the amplified signal to the light-emitting diode OLED, which is the second signal S2.

[0073] In some embodiments, the first signal S1 and the third signal S3 have the same frequency, and their phases can be the same or opposite. Since the light-emitting device 104 is extinguished only when the second signal S2 and the fourth signal S4 are the same, and the second signal S2 is obtained by multi-stage amplification of the first signal S1 by multiple first inductors, while the fourth signal S4 is directly obtained by the second inductor Ht responding to the third signal S3, the first signal S1 and the third signal S3 must have the same frequency in order for the second signal S2 and the fourth signal S4 to be the same. The following example illustrates how to achieve the same frequency for the second signal S2 and the fourth signal S4 when the first signal S1 and the third signal S3 are the same or opposite in phase.

[0074] For example, such as Figure 3 As shown, when the first signal S1 and the third signal S3 are in phase, the number n of inverters included in the second receiving circuit 102 is even, and therefore the number of times the first signal S1 is inverted by inverter Ix is even. That is, the nth stage amplified signal output by inverter In is in phase with the first signal S1, which also means the second signal S2 is in phase with the first signal S1. Since the first signal S1 and the third signal S3 are in phase, and the fourth signal S4 is in phase with the third signal S3, therefore the second signal S2 and the fourth signal S4 are in phase.

[0075] For example, such as Figure 5 As shown, when the first signal S1 and the third signal S3 are out of phase, the number n of inverters included in the second receiving circuit 102 is odd, so the number of times the first signal S1 is inverted by inverter Ix is odd. That is, the nth stage amplified signal output by inverter In is out of phase with the first signal S1, which means the phase of the second signal S2 is out of phase with the first signal S1. Since the first signal S1 and the third signal S3 are out of phase, and the fourth signal S4 is in phase with the third signal S3, the second signal S2 and the fourth signal S4 are in phase.

[0076] In some embodiments, the frequency range of the first signal S1 is 1 kHz to 20 kHz. The signal recognition system of this disclosure can be used to identify signals with a specific frequency, which can be a signal with a frequency range of 1 kHz to 20 kHz. The following describes how the signal recognition system of this disclosure can identify signals with a specific frequency and will not identify signals with other than that specific frequency.

[0077] Exemplarily, taking the specific frequency of 12 kHz as an example, the frequency of the first signal S1 and the third signal S3 is 12 kHz, and only when the first signal S1 with the frequency of 12 kHz and the third signal S3 with the frequency of 12 kHz are both emitted, the second inductor Ht generates a current after inducting the third signal S3 with the frequency of 12 kHz due to the principle of electromagnetic induction, the current can drive the light-emitting diode OLED to emit light, and output the fourth signal S4 to the anode of the light-emitting diode OLED, and the frequency of the fourth signal is also 12 kHz. At the same time, the first inductor Hx generates a current after inducting the third signal S3 with the frequency of 12 kHz, and the current drives the inverter Ix after being rectified by the diode Lx. The first signal S1 with the frequency of 12 kHz is amplified by the inverter Ix step by step, and the second signal S2 is output, and the frequency of the second signal S2 is also 12 kHz. By setting the inductance of the first inductor and the second inductor Ht, the amplitude of the second signal S2 can be the same as the amplitude of the fourth signal S4. If the second signal S2 and the fourth signal S4 are in phase, the second signal S2 and the fourth signal S4 are completely the same, so there is no voltage difference between the anode and the cathode of the light-emitting diode OLED, and the light-emitting diode OLED will be extinguished. When the light-emitting diode OLED is extinguished, it can be determined that the signal recognition system of the embodiment of the present disclosure recognizes the signal with the specific frequency, that is, the signal with the frequency of 12 kHz.

[0078] Exemplarily, taking the specific frequency of 12 kHz as an example, if there is a first interference signal with the frequency of 18 kHz in the recognition range of the signal recognition system, the second inductor Ht can respond to the first interference signal and generate the fourth signal S4 corresponding to the first interference signal. However, since the first antenna A1 cannot receive the first interference signal, the second signal S2 corresponding to the first interference signal will not be generated, and since the second signal S2 and the fourth signal S4 are not the same at this time, the light-emitting diode OLED will not be extinguished, that is, the signal recognition system of the embodiment of the present disclosure can distinguish that the first interference signal does not include the signal with the specific frequency of 12 kHz.

[0079] Exemplarily, taking the specific frequency of 12 kHz identified by the signal identification system as an example, there is a second interference signal in the identification range of the signal identification system of the embodiment of the present disclosure, and the second interference signal is a second interference signal modulated by a second carrier on a signal with a frequency of 18 kHz. Since the frequency of the first antenna A1 is the same as the first carrier, and it is difficult to reverse study the frequency of the first carrier without knowing the frequency of the first carrier, it is difficult to adjust the frequency of the second carrier to be the same or approximately the same as the frequency of the first carrier. Exemplarily, when the frequency of the first carrier is 200 MHz and the frequency of the second carrier is 150 MHz, the frequencies of the two are not matched, and the first signal S1 is represented as direct current, and then the second signal S2 is also represented as direct current. Therefore, even if the second inductor Ht can respond to the second interference signal and generate a fourth signal S4 corresponding to the second interference signal, since the second signal S2 is not the same as the fourth signal S4 at this time, the light-emitting diode OLED will not be extinguished, that is, the signal identification system of the embodiment of the present disclosure can distinguish that the second interference signal does not include a signal with a specific frequency of 12 kHz.

[0080] In any of the above embodiments, the first signal is modulated onto the first carrier of high frequency by the first transmitting circuit 201 to generate the first electromagnetic wave, and the high-frequency first electromagnetic wave is transmitted through the second antenna A0. That is, the embodiment of the present disclosure transmits the low-frequency signal by using the high-frequency carrier. Since the high-frequency carrier itself is sensitive to the design of the receiving antenna, it is not easy to be imitated, and the receiving end can be greatly avoided to be imitated. The electromagnetic induction between the inductor H0 and the first inductor can generate a current to drive the inverter, so that the inverter does not need to be externally connected to the power supply. The electromagnetic induction between the inductor H0 and the second inductor Ht can generate a current to flow to the light-emitting diode OLED. In this way, the signal identification system of the embodiment of the present disclosure can accurately identify the signal with a specific frequency, and does not need to be externally connected to the power supply, and can realize a flexible system.

[0081] Some embodiments of the present disclosure also provide a signal receiving device, which can be the signal receiving device 100 described in any of the above embodiments. The structure and function of the signal receiving device 100 will not be described here.

[0082] Some embodiments of the present disclosure also provide a signal identification method applied to the signal identification system of any of the above embodiments, as shown in the figure, the method comprises: Figure 6

[0083] In step 601, the first receiving circuit 101 receives the first electromagnetic wave S0 from the first transmitting circuit 201, and obtains the first signal S1 according to the first electromagnetic wave S0. The first transmitting circuit 201 is configured to modulate the first signal S1 onto the first carrier to generate the first electromagnetic wave S0.​

[0084] Step 602, the second receiving circuit 102 amplifies the amplitude of the first signal S1 output by the first receiving circuit 101 to obtain a second signal S2.

[0085] Step 603, the third receiving circuit 103 receives a third signal S3 from the second transmitting circuit 202 and outputs a fourth signal S4; wherein, when the second signal S2 is the same as the fourth signal S4, the light emitting device 104 is in an extinguished state; when the second signal S2 is different from the fourth signal S4, the light emitting device 104 is in a light emitting state.

[0086] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto, any person skilled in the art who thinks of changes or replacements within the technical range disclosed by the present disclosure should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A signal receiving apparatus, comprising: a first receiving circuit configured to receive a first electromagnetic wave and obtain a first signal from the first electromagnetic wave, the first electromagnetic wave being generated by modulating the first signal onto a first carrier; a second receiving circuit coupled to the first receiving circuit and configured to amplify a magnitude of the first signal output by the first receiving circuit to obtain a second signal; a third receiving circuit configured to receive a third signal and output a fourth signal; and a light emitting device coupled between the second receiving circuit and the third receiving circuit and configured to be in an off state when the second signal is the same as the fourth signal, and in a light emitting state when the second signal is different from the fourth signal. The second receiving circuit is further configured to receive the third signal.

2. The signal receiving apparatus according to claim 1, wherein The second receiving circuit comprises a plurality of sub-receiving circuits connected in series, each of the sub-receiving circuits comprising:

3. The signal receiving apparatus according to claim 1 or 2, wherein an amplifying device coupled to the first receiving circuit and configured to amplify a magnitude of the first signal output by the first receiving circuit; a first inductor coupled to the amplifying device and configured to receive the third signal and supply power to the amplifying device; a rectifying device coupled between the amplifying device and the first inductor and configured to rectify an induced current generated by the first inductor. The inductance of the first inductor in the plurality of sub-receiving circuits connected in series increases step by step.

4. The signal receiving apparatus according to claim 3, wherein The amplifying device is an amplifier or an inverter.

5. The signal receiving apparatus according to claim 3, wherein The first signal and the third signal have the same frequency, and the first signal and the third signal have the same phase or opposite phase.

6. The signal receiving apparatus according to claim 5, wherein When the first signal and the third signal have the same phase, the number of inverters included in the second receiving circuit is even; when the first signal and the third signal have opposite phase, the number of inverters included in the second receiving circuit is odd.

7. The signal receiving apparatus of claim 6, wherein The third receiving circuit comprises a second inductor, and the inductance of the second inductor is greater than the inductance of the first inductor.

8. The signal receiving apparatus according to claim 3, wherein The inductance of the first inductor in the last sub-receiving circuit in the plurality of sub-receiving circuits is the same as the inductance of the second inductor.

9. The signal receiving apparatus of claim 8, wherein The signal transmitting apparatus comprises a first transmitting circuit and a second transmitting circuit; 10. A signal identification system comprising a signal transmitting device and a signal receiving device according to any one of claims 1 to 9, wherein, The first transmitting circuit is configured to modulate the first signal onto the first carrier to generate the first electromagnetic wave; The second transmitting circuit is configured to emit the third signal. The frequency range of the first signal is 1 kHz-20 kHz.

11. The signal discrimination system of claim 10, wherein, The first receiving circuit comprises a first antenna, and the first transmitting circuit comprises a second antenna, and the first antenna and the second antenna have the same frequency or similar frequency.

12. The signal discrimination system of claim 10 or 11, wherein, The center frequency of the first antenna and the second antenna is greater than or equal to 100 MHz.

13. The signal discrimination system of claim 12, wherein, 14.A signal identification method applied to the signal identification system of any one of claims 10-13, the method comprising: ​ The first receiving circuit receives a first electromagnetic wave from the first transmitting circuit, and obtains a first signal according to the first electromagnetic wave, the first transmitting circuit is configured to modulate the first signal onto a first carrier to generate the first electromagnetic wave; The second receiving circuit amplifies a magnitude of the first signal output by the first receiving circuit to obtain a second signal; The third receiving circuit receives a third signal from the second transmitting circuit, and outputs a fourth signal; wherein, when the second signal is the same as the fourth signal, the light emitting device is in an off state; when the second signal is different from the fourth signal, the light emitting device is in a light emitting state.

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