A communication circuit and a communication module applicable to an intelligent vision scenario

Abstract

The present application discloses a communication circuit and a communication module applicable to the intelligent vision scenario, which relates to the field of communication technologies. In the communication circuit, the baseband chip controls a first selection circuit to generate an analog detection signal by sending a selection signal, and superimposes it on the actual detection signal generated when the SIM card is inserted into the corresponding SIM card holder and then feeds it back to the baseband chip, so that the baseband chip can confirm whether it needs to communicate with the corresponding SIM card. At the same time, the communication channel between the baseband chip and the corresponding SIM card holder is also controlled by the selection signal to switch the second selection circuit to the conducting state. The baseband chip will establish communication with the corresponding SIM card only when it is connected to the corresponding SIM card. Since the software control logic and the hardware channel are switched synchronously, the situation of SIM card data confusion caused by software control errors during the process of repeatedly switching SIM cards is avoided, and the stability of the system operation is improved.

Description

Technical Field

[0001] The present application relates to the field of communication technologies, and particularly to a communication circuit and a communication module applicable to an intelligent vision scenario. Background Art

[0002] In some relatively important areas, visual modules such as cameras are usually set up to monitor the area, so as to facilitate the staff to trace important events that have occurred in the area in the past. For some remote areas, the cost of laying long cables alone is relatively high. Usually, the camera is combined with a communication module, and the camera transmits the images of the monitored area to the base station by means of wireless communication.

[0003] Since the signal in the edge area is generally poor, and for different communication services, the signal strength in different areas is also different. Generally, multiple SIM cards capable of providing different communication services are installed in the communication module to ensure that visual modules such as cameras can stably transmit the images of the monitored area to the base station in real time. In the existing communication modules with multiple SIM cards, the SIM card is usually switched only by software to wake up the SIM card to be used and keep other SIM cards in a sleep state, so as to realize the switching of SIM cards, and the communication channel between the sleeping SIM card and the chip is not cut off. In some areas where the signal strength provided by some communication services changes repeatedly, the software needs to frequently issue switching instructions to realize the switching of SIM cards. Since each SIM card can perform data transmission with the chip at the moment of being awakened, it is easy to confuse the configuration data of multiple SIM cards and cause incorrect interruption configuration of the SIM cards, affecting the normal operation of the system. Summary of the Invention

[0004] The main purpose of the present application is to provide a communication circuit and a communication module applicable to an intelligent vision scenario, aiming to solve the technical problem of how to make the baseband chip communicate with one of the SIM cards more stably in the dual-card single-standby mode.

[0005] To achieve the above object, the present application provides a communication circuit applicable to an intelligent vision scenario. The communication circuit includes: a first selection circuit, a second selection circuit, and a baseband chip;

[0006] The first output terminal of the baseband chip is connected to the control terminals of the first selection circuit and the second selection circuit. The first communication terminal of the baseband chip is connected to the first terminal of the second selection circuit. The second terminal of the second selection circuit is connected to the first communication terminal of the first SIM card holder. The third terminal of the second selection circuit is connected to the first communication terminal of the second SIM card holder. The first output terminal of the first selection circuit is connected to the detection terminal of the first SIM card holder and the first input terminal of the baseband chip. The second output terminal of the first selection circuit is connected to the detection terminal of the second SIM card holder and the second input terminal of the baseband chip. When the first SIM card holder and the second SIM card holder access the SIM card, they send actual detection signals to the baseband chip;

[0007] The first selection circuit is configured to send a corresponding analog detection signal to the baseband chip based on the selection signal sent by the baseband chip;

[0008] The second selection circuit is configured to connect the communication channel between the baseband chip and the first SIM card holder or the second SIM card holder based on the selection signal;

[0009] The baseband chip is configured to communicate with the corresponding SIM card through the corresponding communication channel based on the analog detection signal and the actual detection signal.

[0010] In one embodiment, the first selection circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first NMOS transistor, a first PMOS transistor, and a first N-type bipolar transistor;

[0011] The first output terminal of the baseband chip is connected to the first terminal of the first resistor. The second terminal of the first resistor is respectively connected to the first terminal of the second resistor and the base of the first N-type bipolar transistor. The emitter of the first N-type bipolar transistor and the second terminal of the second resistor are grounded. The collector of the first N-type bipolar transistor is respectively connected to the second terminal of the third resistor, the first terminal of the fourth resistor, and the detection terminal of the second SIM card holder. The second terminal of the fourth resistor is respectively connected to the gate of the first NMOS transistor and the gate of the first PMOS transistor. The source of the first NMOS transistor is grounded. The drain of the first NMOS transistor is connected to the drain of the first PMOS transistor and the first terminal of the fifth resistor. The first terminal of the third resistor and the source of the first PMOS transistor are connected to a first power supply. The second terminal of the fifth resistor is connected to the detection terminal of the first SIM card holder.

[0012] In one embodiment, the communication circuit further includes: a signal detection circuit:

[0013] The signal detection circuit is also connected to the baseband chip through a serial bus;

[0014] The signal detection circuit is used to detect the signal strength of the current baseband chip and send it to the baseband chip;

[0015] The baseband chip is further used to generate the corresponding selection signal based on the comparison result between the signal strength and the preset signal strength;

[0016] Wherein, the preset signal strength is the signal strength of the corresponding baseband chip before a preset time.

[0017] In one embodiment, the communication circuit further includes: a USB interface circuit:

[0018] The USB interface circuit is connected to the second communication end of the baseband chip;

[0019] The USB interface circuit is used to enable the baseband chip to communicate with the vision module through the USB interface when connecting to the vision module.

[0020] In one embodiment, the USB interface circuit includes: a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first inductor, and a second inductor;

[0021] The second communication end includes a first differential signal line and a second differential signal line, and the USB interface includes a first USB data interface and a second USB data interface;

[0022] The first end of the first inductor is used to connect to the first USB data interface, the first end of the second inductor is used to connect to the second USB data interface, the second end of the first inductor is connected to the first differential signal line of the baseband chip, and the second end of the second inductor is connected to the second differential signal line of the baseband chip; the first end of the first inductor is also respectively connected to the first end of the first capacitor, the first end of the second capacitor, and the first end of the third capacitor, and the second end of the first inductor is also connected to the second end of the first capacitor; the first end of the second inductor is also respectively connected to the second end of the third capacitor, the first end of the fourth capacitor, and the first end of the fifth capacitor, and the second end of the second inductor is also connected to the second end of the fourth capacitor; the second end of the second capacitor and the second end of the fifth capacitor are grounded.

[0023] In one embodiment, the USB interface circuit further includes: a sixth resistor, a seventh resistor, a first TVS tube, and a second TVS tube;

[0024] The second end of the sixth resistor is connected to the second end of the first inductor. The first end of the sixth resistor is respectively connected to the first test interface and the cathode of the first TVS diode, and the anode of the first TVS diode is grounded. The second end of the seventh resistor is connected to the second end of the second inductor. The first end of the seventh resistor is respectively connected to the second test interface and the cathode of the second TVS diode, and the anode of the second TVS diode is grounded.

[0025] In one embodiment, the USB interface circuit further includes: an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a second NMOS transistor, and a third NMOS transistor;

[0026] The USB interface further includes a USB power interface;

[0027] The first end of the eighth resistor is connected to the first differential signal line of the baseband chip and the source of the second NMOS transistor. The drain of the second NMOS transistor is respectively connected to the first end of the ninth resistor and the second end of the first inductor. The second end of the ninth resistor is connected to the USB power interface. The second end of the eighth resistor and the gate of the second NMOS transistor are connected to a first power supply. The first end of the tenth resistor is connected to the second differential signal line of the baseband chip and the source of the third NMOS transistor. The drain of the third NMOS transistor is respectively connected to the first end of the eleventh resistor and the second end of the second inductor. The second end of the eleventh resistor is connected to the USB power interface. The second end of the eleventh resistor and the gate of the third NMOS transistor are connected to a second power supply.

[0028] In one embodiment, the communication circuit further includes: a radio frequency circuit and an antenna matching circuit;

[0029] The input end of the radio frequency circuit is connected to the radio frequency output end of the baseband chip. The output end of the radio frequency circuit is connected to the antenna matching circuit, and the antenna matching circuit is also connected to an antenna;

[0030] The baseband chip is further configured to convert the image data sent by the vision module into a digital baseband signal and send the digital baseband signal to the radio frequency circuit when communicating with the SIM card and the vision module;

[0031] The radio frequency circuit is configured to send a corresponding radio frequency signal to the antenna matching circuit when receiving the digital baseband signal, so as to convert the radio frequency signal into an electromagnetic wave through the antenna matching circuit and the antenna and wirelessly transmit it to a base station.

[0032] In one embodiment, the antenna matching circuit includes: a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, and a third inductor;

[0033] The first end of the sixth capacitor is connected to the output end of the radio frequency circuit. The second end of the sixth capacitor is respectively connected to the first end of the seventh capacitor and the first end of the eighth capacitor. The second end of the seventh capacitor is respectively connected to the first end of the ninth capacitor, the first end of the third inductor, and the antenna. The second end of the eighth capacitor, the second end of the ninth capacitor, and the second end of the third inductor are grounded.

[0034] In addition, to achieve the above object, the present application further provides a communication module applicable to the intelligent vision scenario. The communication module employs the communication circuit applicable to the intelligent vision scenario as described above.

[0035] The present application provides a communication circuit and a communication module applicable to the intelligent vision scenario. The communication circuit includes: a first selection circuit, a second selection circuit, and a baseband chip. The first output end of the baseband chip is connected to the control end of the first selection circuit and the control end of the second selection circuit. The first communication end of the baseband chip is connected to the first end of the second selection circuit. The second end of the second selection circuit is connected to the first communication end of the first SIM card holder. The third end of the second selection circuit is connected to the first communication end of the second SIM card holder. The first output end of the first selection circuit is connected to the detection end of the first SIM card holder and the first input end of the baseband chip. The second output end of the first selection circuit is connected to the detection end of the second SIM card holder and the second input end of the baseband chip. The first SIM card holder and the second SIM card holder send actual detection signals to the baseband chip when a SIM card is inserted. The first selection circuit is configured to send a corresponding analog detection signal to the baseband chip based on the selection signal sent by the baseband chip. The second selection circuit is configured to connect the communication channel between the baseband chip and the first SIM card holder or the second SIM card holder based on the selection signal. The baseband chip is configured to communicate with the corresponding SIM card through the corresponding communication channel based on the analog detection signal and the actual detection signal.

[0036] In a communication circuit, a baseband chip controls a first selection circuit to generate an analog detection signal by sending a selection signal, and superimposes it on an actual detection signal generated when a SIM card is inserted into a corresponding SIM card slot and then feeds it back to the baseband chip, so that the baseband chip can confirm whether it needs to communicate with the corresponding SIM card. At the same time, the second selection circuit is also controlled by the selection signal to switch the communication channel between the baseband chip and the corresponding SIM card slot to the conducting state. This enables the baseband chip to establish communication with the corresponding SIM card only when it is connected to the corresponding SIM card. Since the software control logic and the hardware channel are switched synchronously, it avoids the situation of SIM card data confusion caused by software control errors during the process of repeatedly switching SIM cards, and improves the stability of system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0039] Figure 1 FIG. 1 is a schematic structural diagram provided for the first embodiment of the communication circuit applicable to the intelligent vision scenario of the present application;

[0040] Figure 2 FIG. 2 is a circuit connection diagram provided for the second embodiment of the communication circuit applicable to the intelligent vision scenario of the present application;

[0041] Figure 3 FIG. 3 is another circuit connection diagram provided for the second embodiment of the communication circuit applicable to the intelligent vision scenario of the present application.

[0042] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0044] In order to better understand the technical solutions of the present application, the following will be described in detail with reference to the drawings of the specification and the specific embodiments.

[0045] A first embodiment of a communication circuit applicable to the intelligent vision scenario proposed by the present application is described with reference to Figure 1, the communication circuit includes: a first selection circuit 10, a second selection circuit 20, and a baseband chip 30;

[0046] A first output terminal of the baseband chip 30 is connected to a control terminal of the first selection circuit 10 and a control terminal of the second selection circuit 20. A first communication terminal of the baseband chip 30 is connected to a first terminal of the second selection circuit 20. A second terminal of the second selection circuit 20 is connected to a first communication terminal of a first SIM card holder B1. A third terminal of the second selection circuit 20 is connected to a first communication terminal of a second SIM card holder B2. A first output terminal of the first selection circuit 10 is connected to a detection terminal of the first SIM card holder B1 and a first input terminal of the baseband chip 30. A second output terminal of the first selection circuit 10 is connected to a detection terminal of the second SIM card holder B2 and a second input terminal of the baseband chip 30. When a SIM card is inserted into the first SIM card holder B1 and the second SIM card holder B2, an actual detection signal is sent to the baseband chip 30;

[0047] The first selection circuit 10 is configured to send a corresponding analog detection signal to the baseband chip 30 based on a selection signal sent by the baseband chip 30;

[0048] The second selection circuit 20 is configured to connect a communication channel between the baseband chip 30 and the first SIM card holder B1 or the second SIM card holder B2 based on the selection signal;

[0049] The baseband chip 30 is configured to communicate with a corresponding SIM card through the corresponding communication channel based on the analog detection signal and the actual detection signal.

[0050] It should be understood that both the first SIM card slot B1 and the second SIM card slot B2 are used for inserting SIM cards (not shown in the figure). In this embodiment, it can be defaulted that two different SIM cards are inserted into the first SIM card slot B1 and the second SIM card slot B2 respectively. Among them, the detection ends of the first SIM card slot B1 and the second SIM card slot B2 are both connected with physical switches (not shown in the figure), and the two ends of the physical switches are respectively connected to the ground wire and the first input end or the second input end of the baseband chip 30. When the SIM card is fully inserted, it will press the physical switch to close, making the detection end approximately grounded, so that the baseband chip 30 receives a low-level detection signal. At this time, the baseband chip 30 can establish a communication relationship with the SIM card; when the SIM card is pulled out, the physical switch is disconnected, the detection end is no longer grounded and returns to the default high level (connected to the corresponding power supply by the SIM card slot structure). At this time, the baseband chip 30 will not establish a communication relationship with the SIM card. Among them, a certain impedance is provided between the detection ends of the first SIM card slot B1 and the second SIM card B2 and the contact part of the SIM card (that is, between the physical switches). Therefore, when one end of the physical switch is grounded, if the other end receives a high-level electrical signal, the baseband chip 30 will also receive a high-level electrical signal.

[0051] It should be noted that in this embodiment, the selection signal refers to a logical signal generated by the baseband chip 30 for indicating the selected SIM card to communicate. When the first selection circuit 10 receives the selection signal, it will generate a pair of analog detection signals with opposite high and low levels and send them to the detection ends of the first SIM card slot B1 and the second SIM card slot B2 respectively, so that the voltages of the detection ends in the first SIM card slot B1 and the second SIM card slot B2 are kept one high and one low, that is, only one SIM card in the two SIM card slots is allowed to communicate. At the same time, the second selection circuit 20 will also receive the same selection signal and select the connection object of the first end of the circuit (the second end or the third end). When the first end is connected to the second end, the communication channel between the baseband chip 30 and the first SIM card slot B1 is opened while the communication channel between the baseband chip 30 and the second SIM card slot B2 is turned off, and the baseband chip 30 can only receive the communication data transmitted from the first SIM card slot B1; when the first end is connected to the third end, the communication channel between the baseband chip 30 and the second SIM card slot B2 is opened while the communication channel between the baseband chip 30 and the first SIM card slot B1 is turned off, and the baseband chip 30 can only receive the communication data transmitted from the second SIM card slot B2.

[0052] It is easy to understand that in this embodiment, since the control signals of the first selection circuit 10 and the second selection circuit 20 are both selection signals output by the baseband chip 30, the working logic of the first selection circuit 10 corresponds to that of the second selection circuit 20. In a specific implementation, it can be considered that there are SIM cards in both the first SIM card holder B1 and the second SIM card holder B2 in the initial state. Therefore, the two actual detection signals received by the baseband chip 30 in the initial state are both low-level signals. When the baseband chip 30 sends a selection signal to the first selection circuit 10 and the second selection circuit 20, the first selection circuit 10 will send corresponding analog detection signals to the first SIM card holder B1 and the second SIM card holder B2, so that the actual detection signal sent by one of the SIM card holders is forced to rise from low level to high level, while the actual detection signal and the received analog detection signal sent by the other SIM card holder are both low level. Therefore, the superimposed signal received by the baseband chip 30 is actually still low level, so it can be considered that this SIM card can communicate. At the same time, the second selection circuit 20 will correspondingly switch the communication channel to the channel connected to the SIM card that can communicate as described above. In this way, in terms of software control, the baseband chip 30 can communicate with this SIM card. On the hardware circuit, the communication channel between the baseband chip 30 and this SIM card is separately opened. No matter how the SIM card is switched, the entire circuit will maintain the above state. Even if there is an error in software control, the baseband chip 30 cannot receive incorrect communication data, that is, it will not be interfered, so the stability of the circuit and system operation can be guaranteed.

[0053] The communication circuit proposed above is adapted to be within a vision module 60 (such as a camera module) that can perform remote communication. In some scenarios where it is necessary to repeatedly switch SIM cards to ensure communication quality, the SIM card can be stably switched each time, so as to ensure that the vision module 60 and the remote host can better maintain a communication relationship and send the images of the monitored area to the remote host in real time.

[0054] The present application provides a communication circuit applicable to the intelligent vision scenario. The communication circuit includes: a first selection circuit, a second selection circuit, and a baseband chip. The first output terminal of the baseband chip is connected to the control terminals of the first selection circuit and the second selection circuit. The first communication terminal of the baseband chip is connected to the first terminal of the second selection circuit. The second terminal of the second selection circuit is connected to the first communication terminal of the first SIM card holder. The third terminal of the second selection circuit is connected to the first communication terminal of the second SIM card holder. The first output terminal of the first selection circuit is connected to the detection terminal of the first SIM card holder and the first input terminal of the baseband chip. The second output terminal of the first selection circuit is connected to the detection terminal of the second SIM card holder and the second input terminal of the baseband chip. The first SIM card holder and the second SIM card holder send actual detection signals to the baseband chip when a SIM card is inserted. The first selection circuit is configured to send a corresponding analog detection signal to the baseband chip based on the selection signal sent by the baseband chip. The second selection circuit is configured to connect the communication channel between the baseband chip and the first SIM card holder or the second SIM card holder based on the selection signal. The baseband chip is configured to communicate with the corresponding SIM card through the corresponding communication channel based on the analog detection signal and the actual detection signal. In the communication circuit, the baseband chip controls the first selection circuit to generate an analog detection signal by sending a selection signal, and superimposes it on the actual detection signal generated when the SIM card is inserted into the corresponding SIM card holder and then feeds it back to the baseband chip, so that the baseband chip can confirm whether it needs to communicate with the corresponding SIM card. At the same time, the second selection circuit is also controlled by the selection signal to switch the communication channel between the baseband chip and the corresponding SIM card holder to the conducting state. So that the baseband chip will establish communication with the corresponding SIM card only when it is connected to the corresponding SIM card. Since the software control logic and the hardware channel are switched synchronously, the situation of SIM card data confusion caused by software control errors during the process of repeatedly switching SIM cards is avoided, and the stability of system operation is improved.

[0055] Based on the first embodiment of the communication circuit applicable to the intelligent vision scenario of the present application, in the second embodiment of the communication circuit applicable to the intelligent vision scenario of the present application, the content that is the same as or similar to the above-mentioned first embodiment can be referred to the above introduction and will not be repeated hereinafter. On this basis, please refer to Figure 2 , the first selection circuit 10 includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first NMOS transistor Qn1, a first PMOS transistor Qp1, and a first N-type bipolar transistor Vn1;

[0056] The first output terminal of the baseband chip 30 is connected to the first end of the first resistor R1. The second end of the first resistor R1 is respectively connected to the first end of the second resistor R2 and the base of the first N-type triode Vn1. The emitter of the first N-type triode Vn1 and the second end of the second resistor R2 are grounded. The collector of the first N-type triode Vn1 is respectively connected to the second end of the third resistor R3, the first end of the fourth resistor R4, and the detection terminal of the second SIM card holder B2. The second end of the fourth resistor R4 is respectively connected to the gate of the first NMOS transistor Qn1 and the gate of the first PMOS transistor Qp1. The source of the first NMOS transistor Qn1 is grounded. The drain of the first NMOS transistor Qn1 is connected to the drain of the first PMOS transistor Qp1 and the first end of the fifth resistor R5. The first end of the third resistor R3 is connected to the source of the first PMOS transistor Qp1 to the first power supply VCC1. The second end of the fifth resistor R5 is connected to the detection terminal of the first SIM card holder B1.

[0057] It should be noted that, in this embodiment, the first resistor R1, the second resistor R2, the third resistor R3, and the first N-type triode Vn1 constitute a driving circuit. When the baseband chip 30 outputs a high-level selection signal, the first N-type triode Vn1 is turned on, and the collector voltage of the first N-type triode Vn1 is pulled low, that is, a low-level analog detection signal is output to the detection terminal of the second SIM card holder B2. The fourth resistor R4, the first NMOS transistor Qn1, the first PMOS transistor Qp1, and the fifth resistor R5 constitute a reverse push-pull circuit. When the collector of the first N-type triode Vn1 is grounded and the collector voltage is pulled low, the first PMOS transistor Qp1 is turned on, and the first NMOS transistor Qn1 is turned off, and a high-level signal is output, that is, a high-level analog detection signal is output to the detection terminal of the first SIM card holder B1.

[0058] Correspondingly, when the baseband chip 30 outputs a low-level selection signal, the first N-type triode Vn1 is turned off, and the collector voltage of the first N-type triode Vn1 is pulled high by the first power supply VCC1, that is, a high-level analog detection signal is output to the detection terminal of the second SIM card holder B2. At this time, the first PMOS transistor Qp1 is turned off, and the first NMOS transistor is turned on, and a low-level signal is output, that is, a low-level analog detection signal is output to the detection terminal of the first SIM card holder B1. Among them, both the fourth resistor R4 and the fifth resistor R5 are current-limiting resistors.

[0059] Further, in this embodiment, the communication circuit further includes: a signal detection circuit 40:

[0060] The signal detection circuit 40 is also connected to the baseband chip 30 through a serial bus;

[0061] The signal detection circuit 40 is configured to detect the signal strength of the current baseband chip 30 and send it to the baseband chip 30;

[0062] The baseband chip 30 is further configured to generate the corresponding selection signal based on the comparison result between the signal strength and a preset signal strength;

[0063] Wherein, the preset signal strength is the signal strength of the baseband chip 30 corresponding to a preset time ago.

[0064] It should be noted that, in this embodiment, the communication circuit may further include a signal detection circuit 40. After the baseband chip 30 communicates with any one of the SIM cards, a corresponding communication signal will be generated. At this time, the signal strength of the communication signal can be collected by a signal acquisition circuit with detection and amplification functions connected through a serial bus and fed back to the baseband chip 30 in a suitable manner, such as converted into a digital signal. After receiving the signal strength, the baseband chip 30 can compare it with the preset signal strength recorded in advance, and judge whether to switch the SIM card currently according to the comparison result. If the current signal strength cannot reach the preset signal strength, a corresponding selection signal can be generated to switch the SIM card and re - establish a communication relationship to enjoy the communication service provided by another SIM card.

[0065] It is easy to understand that the preset signal strength refers to the signal strength of the communication signal generated by the baseband chip 30 recorded a preset time ago. The preset time can be the time recorded when switching the SIM card last time, or any set period of time.

[0066] Further, in this embodiment, the communication circuit further includes: a USB interface circuit 50:

[0067] The USB interface circuit 50 is connected to the second communication end of the baseband chip 30;

[0068] The USB interface circuit 50 is configured to enable the baseband chip 30 to communicate with the vision module 60 through the USB interface when connected to the vision module 60.

[0069] It should be noted that in this embodiment, the USB interface circuit 50 can be used to establish a connection relationship between the USB communication line of the baseband chip 30 and an external interface, for example, connecting to the vision module 60. The vision module 60 can be a camera or a device, apparatus, or equipment for generating image data, etc., which is used to monitor a target area and generate corresponding images or videos. The images or videos can be stored and called in the form of image data. When the baseband chip 30 is connected to the vision module 60, a communication relationship can be established through the USB communication protocol for two-way communication. The baseband chip 30 can receive the image data transmitted by the vision module 60 through the USB bus, and after performing modulation, encryption and other processing methods, generate corresponding communication signals and wirelessly transmit them to the base station 90 through other circuits.

[0070] As a preferred method, the baseband chip 30 can be a PANGU M900 chip, which has an 8-core 64-bit high-performance CPU (2.3GHz). A single chip integrates a CPU, a graphics card, a sound card, a network card, etc., and can perform rapid calculation and processing on image signals and data, with strong computing power. It can build multiple functional circuits, facilitating the update and iteration of the circuits.

[0071] Furthermore, in this embodiment, the USB interface circuit 50 includes: a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first inductor L1, and a second inductor L2;

[0072] The second communication end includes a first differential signal line and a second differential signal line, and the USB interface includes a first USB data interface and a second USB data interface;

[0073] The first end of the first inductor L1 is used to connect to the first USB data interface, the first end of the second inductor L2 is used to connect to the second USB data interface, the second end of the first inductor L1 is connected to the first differential signal line of the baseband chip 30, and the second end of the second inductor L2 is connected to the second differential signal line of the baseband chip 30; the first end of the first inductor L1 is also respectively connected to the first end of the first capacitor C1, the first end of the second capacitor C2, and the first end of the third capacitor C3, and the second end of the first inductor L1 is also connected to the second end of the first capacitor C1; the first end of the second inductor L2 is also respectively connected to the second end of the third capacitor C3, the first end of the fourth capacitor C4, and the first end of the fifth capacitor C5, and the second end of the second inductor L2 is also connected to the second end of the fourth capacitor C4; the second end of the second capacitor C2 and the second end of the fifth capacitor C5 are grounded.

[0074] It should be noted that the vision module 60 is connected to the baseband chip 30 through a USB data cable of the USB interface. The USB data cable is a pair of transmission lines for transmitting differential signals. In this embodiment, the third capacitor C3 is an X capacitor, which is mainly used to absorb high-frequency interference and reduce power supply noise. The second capacitor C2 and the fifth capacitor C5 are Y capacitors, which are mainly used to suppress common-mode interference and eliminate high-frequency noise introduced from the outside or generated inside the circuit. The first inductor L1 and the second inductor L2 are a pair of common-mode inductors, which are used to increase the impedance of the common-mode loop, suppress common-mode noise and high-frequency interference in the circuit. The first capacitor C1 and the fourth capacitor C4 are respectively connected in parallel with the first inductor L1 and the second inductor L2, and can form a low-pass filter, allowing only low-frequency image signals to be transmitted in the line, which helps to reduce signal distortion and attenuation, improve the quality of signal transmission, and further enhance the communication stability of the entire system.

[0075] Furthermore, in this embodiment, the USB interface circuit 50 further includes: a sixth resistor R6, a seventh resistor R7, a first TVS diode D1, and a second TVS diode D2;

[0076] The second end of the sixth resistor R6 is connected to the second end of the first inductor L1. The first end of the sixth resistor R6 is respectively connected to the first test interface Pc1 and the cathode of the first TVS diode D1, and the anode of the first TVS diode D1 is grounded; the second end of the seventh resistor R7 is connected to the second end of the second inductor L2. The first end of the seventh resistor R7 is respectively connected to the second test interface Pc2 and the cathode of the second TVS diode D2, and the anode of the second TVS diode D2 is grounded.

[0077] It should be noted that in this embodiment, the USB interface circuit 50 may also be provided with a first test interface Pc1 and a second test interface Pc2 for external connection. When it is necessary to test the USB communication, the first test interface Pc1 and the second test interface Pc2 will transmit corresponding differential signals for separately testing the USB communication (signal integrity).

[0078] It is easy to understand that in this embodiment, the sixth resistor R6 constitutes the current-limiting resistor of the first test interface Pc1, and the seventh resistor R7 constitutes the current-limiting resistor of the second test interface Pc2. The first TVS diode D1 is used to protect the first test interface Pc1 to prevent excessive peak current from damaging the circuit when the first test interface Pc1 is connected or disconnected. The corresponding second TVS diode D2 has a similar function to the first TVS diode D1 and is used to protect the second test interface Pc2.

[0079] It should be noted that when the first test interface Pc1 and the second test interface Pc2 are not in use, the first TVS tube D1 and the second TVS tube D2 can also protect the two differential signal lines of the USB interface to prevent voltage anomalies or current anomalies from occurring during USB communication. Such a setting can more quickly troubleshoot the image transmission communication process, facilitating the search for and repair of communication faults.

[0080] Furthermore, in this embodiment, the USB interface circuit 50 further includes: an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a second NMOS transistor Qn2, and a third NMOS transistor Qn3;

[0081] The USB interface further includes a USB power interface Pu0;

[0082] The first end of the eighth resistor R8 is connected to the first differential signal line of the baseband chip 30 and the source electrode of the second NMOS transistor Qn2. The drain electrode of the second NMOS transistor Qn2 is respectively connected to the first end of the ninth resistor R9 and the second end of the first inductor L1. The second end of the ninth resistor R9 is connected to the USB power interface Pu0. The second end of the eighth resistor R8 and the gate electrode of the second NMOS transistor Qn2 are connected to the first power supply VCC1. The first end of the tenth resistor R10 is connected to the second differential signal line of the baseband chip 30 and the source electrode of the third NMOS transistor Qn3. The drain electrode of the third NMOS transistor Qn3 is respectively connected to the first end of the eleventh resistor R11 and the second end of the second inductor L2. The second end of the eleventh resistor R11 is connected to the USB power interface Pu0. The second end of the eleventh resistor R11 and the gate electrode of the third NMOS transistor Qn3 are connected to the second power supply VCC2.

[0083] It should be noted that the USB power interface Pu0 refers to the interface connected to the power line of the vision module 60. In actual situations, since there are multiple voltages in USB communication, the system voltage inside the vision module 60 and the system voltage of the communication circuit may not be inconsistent. In this embodiment, the second power supply VCC2 is the system power supply of the baseband chip 30. To meet the requirement that the serial port baud rate reaches 921600 bps, a level conversion circuit can be formed by the eighth resistor R8, the ninth resistor R9, and the second NMOS transistor Qn2, and a level conversion circuit can be formed by the tenth resistor R10, the eleventh resistor R11, and the third NMOS transistor Qn3, so that the baseband chip 30 can successfully recognize the voltage of the image signal transmitted on the USB communication line.

[0084] Furthermore, in this embodiment, the communication circuit further includes: a radio frequency circuit 70 and an antenna matching circuit 80;

[0085] The input end of the radio frequency circuit 70 is connected to the radio frequency output end of the baseband chip 30, the output end of the radio frequency circuit 70 is connected to the antenna matching circuit 80, and the antenna matching circuit 80 is also connected to the antenna ANT;

[0086] The baseband chip 30 is further configured to convert the image data sent by the vision module 60 into a digital baseband signal and send the digital baseband signal to the radio frequency circuit 70 when communicating with the SIM card and the vision module 60;

[0087] The radio frequency circuit 70 is configured to send a corresponding radio frequency signal to the antenna matching circuit 80 when receiving the digital baseband signal, so as to wirelessly transmit the radio frequency signal to the base station 90 after converting it into an electromagnetic wave through the cooperation of the antenna matching circuit 80 and the antenna ANT.

[0088] It should be noted that in this embodiment, after establishing communication with the SIM card, the baseband chip 30 can read the user information stored in the SIM card and other data provided by the operator (such as access point name, address, etc.). During the network access process, it can also generate and transmit authentication data through an encryption algorithm and transmit it with the communication signal described above, or understood as transmitting it with a digital baseband signal. After generating the digital baseband signal, the baseband chip 30 can transmit it to the radio frequency circuit 70, and the radio frequency circuit 70 modulates and amplifies the signal based on the received digital baseband signal and then transmits it to the antenna matching circuit 80. The antenna matching circuit 80 performs impedance matching between the radio frequency circuit 70 and the antenna ANT, so that the antenna ANT can convert the impedance-matched radio frequency signal into an electromagnetic wave and emit it outward. The base station 90 can absorb the converted electromagnetic wave and forward it to other surrounding communication devices or communication equipment (not shown in the figure). In addition, the antenna ANT can also receive the electromagnetic wave sent by the base station 90, convert it into a radio frequency signal, and transmit the radio frequency signal to the radio frequency circuit 70. After the radio frequency circuit 70 performs filtering, frequency conversion, amplification, demodulation and other processing methods on it, the corresponding digital signal is obtained and then transmitted to the baseband chip 30. Among them, impedance matching can reduce signal reflection and loss and improve the transmission efficiency and performance of the system.

[0089] Through the above two working modes, the baseband chip 30 can perform wireless communication with external communication devices or communication equipment, and the baseband chip 30 can also perform wired communication with the vision module 60 through the USB bus. Therefore, it is possible to transmit the image data of the vision module 60 to the communication device or communication equipment, so that the communication device or communication equipment can quickly obtain the image data stored in the vision module 60 and convert it into an image or video, facilitating the staff to observe the specific events occurring in the target area during the corresponding time period. In addition, the vision module 60 can also obtain the control instructions sent by the communication device or communication equipment through the above method, thereby changing the monitoring method, such as changing the monitoring angle, or switching to functions such as infrared monitoring.

[0090] Furthermore, in this embodiment, the antenna matching circuit 80 is further configured to, when receiving the radio frequency signal sent by the radio frequency circuit 70, cooperate with the antenna ANT to convert the radio frequency signal into an electromagnetic wave and wirelessly transmit it to the target communication module 91 within a preset range.

[0091] It should be noted that the preset range refers to a range where the communication quality between communication modules can be guaranteed to be relatively good at one end, and it can be within 100m. In this embodiment, the antenna ANT can also convert the radio frequency signal adapted by the impedance matching circuit 80 into a corresponding electromagnetic wave, send it to the target communication module 91 within the preset range, or receive the electromagnetic wave sent by the target communication module 91 within the preset range, so as to achieve wireless communication with the target communication module 91.

[0092] It is easy to understand that in this embodiment, the target communication module 91 can be regarded as a small transfer station. When the communication quality between the current antenna ANT and the base station 90 is poor or it is impossible to directly perform wireless communication with the base station 90, the surrounding target communication modules 91 can be used as transfer stations, first perform wireless communication with the target communication module 91, and then perform wireless communication with the base station 90 through the target communication module 91, thereby indirectly realizing the wireless communication between the current antenna ANT and the base station 90. In this way, even if the signal in the area where the current communication module is located is poor, wireless communication between modules can be used to indirectly realize wireless communication with a distant communication device or communication equipment.

[0093] As a special case, please refer to Figure 3, if there are multiple target communication modules 91 in the vicinity and none of the target communication modules 91 within the preset range can directly perform wireless communication with the base station 90, one of the other target communication modules 91 within the preset range of each target communication module 91 can also be used as the next relay station until the last target communication module 91 successfully establishes a wireless communication relationship with the base station 90. Through a relatively long communication line formed by the above-mentioned target communication modules 91, relatively stable wireless communication can also be achieved between the antenna ANT and the base station 90.

[0094] Further, in this embodiment, the antenna matching circuit 80 includes: a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, and a third inductor L3;

[0095] The first end of the sixth capacitor C6 is connected to the output end of the radio frequency circuit 70, the second end of the sixth capacitor C6 is respectively connected to the first end of the seventh capacitor C7 and the first end of the eighth capacitor C8, the second end of the seventh capacitor C7 is respectively connected to the first end of the ninth capacitor C9, the first end of the third inductor L3, and the antenna ANT; the second ends of the eighth capacitor C8, the ninth capacitor C9, and the second end of the third inductor L3 are grounded.

[0096] It should be noted that, in this embodiment, a π-shaped antenna matching circuit 80 is formed by the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9, and the third inductor L3, so that the trace impedance is maintained at 50Ω. Among them, the frequency of the antenna ANT can be 703~5000MHZ.

[0097] It is worth noting that, in actual situations, the antenna matching circuit 80 can also be a double L-shaped, and there can be two antenna matching circuits 80. The structures of the two antenna matching circuits 80 are the same and will not be elaborated here.

[0098] The embodiment of the present application also provides a communication module applicable to the intelligent vision scenario. The communication module adopts the communication circuit applicable to the intelligent vision scenario as described above. The communication module provided by the embodiment of the present application adopts the communication circuit applicable to the intelligent vision scenario as described above, and can solve the technical problem of how to make the baseband chip communicate with one of the SIM cards more stably in the dual SIM single standby mode. Compared with the prior art, the beneficial effects of the communication module provided by the embodiment of the present application are the same as those of the communication circuit applicable to the intelligent vision scenario provided by the above embodiment, and will not be elaborated here.

[0099] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent scope of the present application.

Claims

1. A communication circuit applicable to intelligent visual scenes, characterized in that: The communication circuit is used to communicate with the visual module, and the communication circuit includes: a first selection circuit, a second selection circuit and a baseband chip; The first output end of the baseband chip is connected to the control end of the first selection circuit and the control end of the second selection circuit, the first communication end of the baseband chip is connected to the first end of the second selection circuit, the second end of the second selection circuit is connected to the first communication end of the first SIM card holder, the third end of the second selection circuit is connected to the first communication end of the second SIM card holder, the first output end of the first selection circuit is connected to the detection end of the first SIM card holder and the first input end of the baseband chip, and the second output end of the first selection circuit is connected to the detection end of the second SIM card holder and the second input end of the baseband chip; the first SIM card holder and the second SIM card holder send actual detection signals to the baseband chip when the SIM card is connected; The first selection circuit is used to send corresponding analog detection signals to the first SIM card holder and the second SIM card holder respectively based on the selection signal sent by the baseband chip, and transmit the corresponding analog detection signals to the baseband chip through the detection end of the first SIM card holder and the detection end of the second SIM card holder respectively; The second selection circuit is used to connect the communication channel between the baseband chip and the first SIM card holder or the second SIM card holder based on the selection signal; The baseband chip is used to communicate with the corresponding SIM card through the corresponding communication channel based on the simulated detection signal and the actual detection signal.

2. The communication circuit applicable to intelligent visual scenes as claimed in claim 1, characterized in that: The first selection circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first NMOS transistor, a first PMOS transistor and a first N-type triode; The first output end of the baseband chip is connected to the first end of the first resistor, and the second end of the first resistor is respectively connected to the first end of the second resistor and the base of the first N-type transistor; the emitter of the first N-type transistor and the second end of the second resistor are grounded, the collector of the first N-type transistor is respectively connected to the second end of the third resistor, the first end of the fourth resistor and the detection end of the second SIM card holder, the second end of the fourth resistor is respectively connected to the gate of the first NMOS tube and the gate of the first PMOS tube, the source of the first NMOS tube is grounded, the drain of the first NMOS tube is connected to the drain of the first PMOS tube and the first end of the fifth resistor, the first end of the third resistor and the source of the first PMOS tube are connected to the first power supply, and the second end of the fifth resistor is connected to the detection end of the first SIM card holder.

3. The communication circuit applicable to intelligent visual scenes as claimed in claim 1, characterized in that: The communication circuit also includes: a signal detection circuit: The signal detection circuit is also connected to the baseband chip via a serial port bus; The signal detection circuit is used to detect the signal strength of the current baseband chip and send it to the baseband chip; The baseband chip is further used to generate the corresponding selection signal based on the comparison result between the signal strength and the preset signal strength; The preset signal strength is the signal strength of the baseband chip corresponding to a preset time before.

4. The communication circuit applicable to intelligent visual scenes as claimed in claim 1, characterized in that: The communication circuit also includes: USB interface circuit: The USB interface circuit is connected to the second communication terminal of the baseband chip; The USB interface circuit is used to enable the baseband chip to communicate with the vision module through the USB interface when the vision module is connected.

5. The communication circuit applicable to intelligent visual scenes as claimed in claim 4, characterized in that: The USB interface circuit comprises: a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first inductor and a second inductor; The second communication end includes a first differential signal line and a second differential signal line, and the USB interface includes a first USB data interface and a second USB data interface; The first end of the first inductor is used to connect the first USB data interface, the first end of the second inductor is used to connect the second USB data interface, the second end of the first inductor is connected to the first differential signal line of the baseband chip, and the second end of the second inductor is connected to the second differential signal line of the baseband chip; the first end of the first inductor is also connected to the first end of the first capacitor, the first end of the second capacitor and the first end of the third capacitor respectively, and the second end of the first inductor is also connected to the second end of the first capacitor; the first end of the second inductor is also connected to the second end of the third capacitor, the first end of the fourth capacitor and the first end of the fifth capacitor respectively, and the second end of the second inductor is also connected to the second end of the fourth capacitor; the second end of the second capacitor and the second end of the fifth capacitor are grounded.

6. The communication circuit applicable to intelligent visual scenes as claimed in claim 5, characterized in that: The USB interface circuit further includes: a sixth resistor, a seventh resistor, a first TVS tube and a second TVS tube; The second end of the sixth resistor is connected to the second end of the first inductor, the first end of the sixth resistor is respectively connected to the first test interface and the cathode of the first TVS tube, and the anode of the first TVS tube is grounded; the second end of the seventh resistor is connected to the second end of the second inductor, the first end of the seventh resistor is respectively connected to the second test interface and the cathode of the second TVS tube, and the anode of the second TVS tube is grounded.

7. The communication circuit applicable to intelligent visual scenes as claimed in claim 5, characterized in that: The USB interface circuit further includes: an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a second NMOS transistor and a third NMOS transistor; The USB interface also includes a USB power interface; The first end of the eighth resistor is connected to the first differential signal line of the baseband chip and the source of the second NMOS tube, and the drain of the second NMOS tube is respectively connected to the first end of the ninth resistor and the second end of the first inductor; the second end of the ninth resistor is connected to the USB power interface; the second end of the eighth resistor and the gate of the second NMOS tube are connected to the first power supply; the first end of the tenth resistor is connected to the second differential signal line of the baseband chip and the source of the third NMOS tube, and the drain of the third NMOS tube is respectively connected to the first end of the eleventh resistor and the second end of the second inductor; the second end of the eleventh resistor is connected to the USB power interface; the second end of the eleventh resistor and the gate of the third NMOS tube are connected to the second power supply.

8. The communication circuit applicable to intelligent visual scenes as claimed in claim 4, characterized in that: The communication circuit also includes: a radio frequency circuit and an antenna matching circuit; The input end of the radio frequency circuit is connected to the radio frequency output end of the baseband chip, the output end of the radio frequency circuit is connected to the antenna matching circuit, and the antenna matching circuit is also connected to the antenna; The baseband chip is further used to convert the image data sent by the visual module into a digital baseband signal when communicating with the SIM card and the visual module, and send the digital baseband signal to the radio frequency circuit; The RF circuit is used to send a corresponding RF signal to the antenna matching circuit when receiving the digital baseband signal, so that the RF signal can be converted into electromagnetic waves through the antenna matching circuit in cooperation with the antenna and then wirelessly transmitted to the base station.

9. The communication circuit applicable to intelligent visual scenes as claimed in claim 8, characterized in that: The antenna matching circuit includes: a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, and a third inductor; The first end of the sixth capacitor is connected to the output end of the RF circuit, the second end of the sixth capacitor is respectively connected to the first end of the seventh capacitor and the first end of the eighth capacitor, the second end of the seventh capacitor is respectively connected to the first end of the ninth capacitor, the first end of the third inductor and the antenna; the second end of the eighth capacitor, the second end of the ninth capacitor, and the second end of the third inductor are grounded.

10. A communication module applicable to intelligent visual scenes, characterized in that: The communication module adopts a communication circuit applicable to smart vision scenarios as described in any one of claims 1-9.

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