Around view controller, vehicle-mounted anti-interference video transmission system and vehicle

Abstract

The invention discloses a look-around controller, a vehicle-mounted anti-interference video transmission system and a vehicle, the look-around controller is used for receiving and processing analog video signals of a plurality of vehicle-mounted cameras and sending the processed analog video signals to a vehicle machine, and the look-around controller comprises a digital ground part and an analog ground part, the digital ground part and the analog ground part are respectively and independently grounded; the decoder unit is arranged on the digital ground part, and the DAC unit is arranged on the analog ground part, so that the decoder unit and the DAC unit are independently grounded, and the reference ground level of the DAC unit can be independently obtained from the vehicle machine end and then is converged into the whole vehicle ground from a grounding point of the vehicle machine end. Therefore, it is ensured that the reference ground level of the DAC unit can be isolated from the reference ground level of the decoder unit, the problem that the video display effect is affected by interference fringes generated by the video displayed on the basis of the analog video signal on the vehicle is avoided, and the user experience is improved while the advantage of low cost is kept.

Description

Technical Field

[0001] The present invention relates to the field of vehicle-mounted controllers, and more particularly, to a surround-view controller, a vehicle-mounted anti-interference video transmission system, and a vehicle. Background Art

[0002] With the development of social economy, the number of automobiles has increased rapidly, urban roads have become congested, and the traffic environment faced by drivers has become extremely complex. Moreover, drivers have visual blind spots when driving vehicles and cannot fully understand the scenes around the vehicles. In order to provide drivers with a panoramic view of the surrounding environment of the vehicle body without dead angles and improve driving safety, vehicle-mounted panoramic surround-view systems have emerged. Currently, various active safety technologies, such as driving lane detection, parking space detection, and moving object detection, have been applied to vehicle-mounted surround-view systems. The surround-view controller is often used in conjunction with a car machine / a vehicle central control screen / an independent display screen. The surround-view controller receives and splices the images input by the cameras around the vehicle body, and then outputs the surround-view image to the car machine or the display screen after splicing. Considering the length of vehicle body wiring and the price advantage of relevant processors, analog high-definition video signals that can be transmitted using a single wire, such as CVBS, TVI, or AHD, etc., are usually selected for video signals. They support a relatively long transmission distance, only require a single wire to be routed, and the wire is relatively thin. This not only facilitates wiring but also reduces costs.

[0003] However, compared with digital signals, analog video signals are relatively sensitive to interference; digital signals have only two states, low level and high level, and have a higher tolerance for interference voltage. Since each different voltage of an analog video signal corresponds to a different brightness / chrominance, it is extremely easy for the picture to show abnormal phenomena due to interference. In the application of the surround-view controller, since it is usually used in conjunction with a car machine / display screen, in the actual vehicle wiring, the distance between the two is usually relatively far, resulting in a potential difference between the ground level of the surround-view controller and the ground level of the car machine. This potential difference is not constant but is affected by the magnitude of the current in the vehicle body ground loop. When the vehicle body generator / windshield wiper / horn works, the potential difference will also fluctuate accordingly, resulting in interference stripes in the form of water ripples in the parsing effect of the analog video signal, affecting the video display effect. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a surround view controller for receiving and processing analog video signals from multiple vehicle-mounted cameras and transmitting the processed analog video signals to the in-vehicle infotainment (IVI) system. The surround view controller includes a digital ground part and an analog ground part, and the digital ground part and the analog ground part are grounded independently. The surround view controller further includes a first signal processing module and a second signal processing module. A decoder unit and a DAC (Digital-to-Analog Converter) unit are provided in the second signal processing module. The decoder unit is configured to receive the digital signal output by the first signal processing module and transmit the decoded digital signal to the DAC unit. The DAC unit is configured to convert the digital signal output by the decoder into an analog video signal and output it to the IVI system. The first signal processing module is disposed in the digital ground part, and the second signal processing module is disposed in both the digital ground part and the analog ground part. Among them, the decoder unit is disposed in the digital ground part, and the DAC unit is disposed in the analog ground part to achieve independent grounding of the decoder unit and the DAC unit.

[0005] The surround view controller according to the first aspect embodiment of the present invention has at least the following beneficial effects:

[0006] The surround view controller according to the first aspect embodiment of the present invention, by providing an analog ground part and a digital ground part that are independently grounded, and making the decoder unit and the DAC unit in the second signal processing module belong to the analog ground part and the digital ground part respectively, enables the reference ground level of the DAC unit to be independently obtained from the IVI system end, then flows into the vehicle ground from the grounding point of the IVI system end, and is then connected to the digital ground part of the surround view controller. That is to say, it ensures that the reference ground level of the DAC unit can be isolated from the reference ground level of the decoder unit, and it completely obtains from the IVI system, transferring the potential difference to the digital signal with relatively strong anti-interference ability. Therefore, it can be ensured that when the power supply is superimposed with an AC part due to high-power electrical appliances, the ground potential difference is mainly generated in the digital ground part of the surround view controller. Since its analog ground part is isolated from the digital ground part and connected to the grounding point of the IVI system end, that is, it is common-grounded with the IVI system ground, it is basically not affected by this part of the ground potential difference. Thus, the problem that the video displayed on the IVI system based on the analog video signal generates interference stripes and affects the video display effect is avoided, while maintaining the low-cost advantage and improving the user experience.

[0007] In one embodiment, a clamping circuit is provided between the digital ground part and the analog ground part to prevent the ground potential difference between the digital ground part and the analog ground part from being too large and burning out the second signal processing module.

[0008] In one embodiment, the clamping circuit adopts a passive clamping circuit composed of switching diodes.

[0009] In one embodiment, an electrostatic discharge (ESD) release path is provided between the digital ground portion and the analog ground portion.

[0010] In one embodiment, the second signal processing module is provided with a first ground pin and a second ground pin. The first ground pin is disposed in the digital ground portion, and the second ground pin is disposed in the analog ground portion. The ESD release path is provided between the first ground pin and the second ground pin.

[0011] In one embodiment, the ESD release path includes a multi-layer ceramic capacitor disposed between the first ground pin and the second ground pin.

[0012] An in-vehicle anti-interference video transmission system according to an embodiment of the second aspect of the present invention includes a surround view controller and a vehicle head unit. The surround view controller includes a digital ground portion and an analog ground portion, and the digital ground portion and the analog ground portion are grounded independently.

[0013] The surround view controller further includes a first signal processing module and a second signal processing module. A decoder unit and a DAC unit are provided in the second signal processing module. The decoder unit is configured to receive the digital signal output by the first signal processing module and transmit the decoded digital signal to the DAC unit. The DAC unit is configured to convert the digital signal output by the decoder into an analog video signal and output it to the vehicle head unit. The first signal processing module is disposed in the digital ground portion, and the second signal processing module is disposed in both the digital ground portion and the analog ground portion. Among them, the decoder unit is disposed in the digital ground portion, and the DAC unit is disposed in the analog ground portion to achieve independent grounding of the decoder unit and the DAC unit. A third signal processing module is provided in the vehicle head unit, and the third signal processing module is connected to the second signal processing module for receiving the analog video signal output by the DAC unit.

[0014] The in-vehicle anti-interference video transmission system according to the embodiment of the second aspect of the present invention has at least the following beneficial effects:

[0015] In the on-vehicle anti-interference video transmission system according to the second aspect of the present invention, the surround-view controller sets an analog ground part and a digital ground part with independent grounding respectively, and makes the decoder unit and the DAC unit in the second signal processing module belong to the analog ground part and the digital ground part respectively, so that the reference ground level of the DAC unit can be independently obtained from the vehicle head unit, then flows into the vehicle ground from the grounding point of the vehicle head unit, and then is connected to the digital ground part of the surround-view controller. That is to say, it ensures that the reference ground level of the DAC unit can be isolated from the reference ground level of the decoder unit, and it completely comes from the vehicle head unit, shifting the potential difference to the digital signal with relatively strong anti-interference ability. Therefore, it can ensure that when the power supply is superimposed with an AC part due to high-power electrical appliances, the ground potential difference is mainly generated in the digital ground part of the surround-view controller. Since its analog ground part is isolated from the digital ground part and is connected to the grounding point of the vehicle head unit, that is, it is common-grounded with the vehicle head unit ground, it is basically not affected by this part of the ground potential difference, thus avoiding the problem that the video displayed on the vehicle head unit based on the analog video signal generates interference stripes and affects the video display effect. In addition, the on-vehicle anti-interference video transmission system of the present invention has a wiring method that is compatible with the existing conventional in-vehicle wiring method, and can maintain a low production cost while avoiding the generation of interference stripes and improving the display effect.

[0016] In an embodiment, the on-vehicle anti-interference video transmission system further includes a vehicle ground wire, a first grounding point, and a second grounding point; the second signal processing module of the surround-view controller is provided with a first grounding pin and a second grounding pin, the first grounding pin is set in the digital ground part, and the second grounding pin is set in the analog ground part; the first grounding pin is connected to the vehicle ground wire and is grounded through the first grounding point; the vehicle head unit is provided with a third grounding pin, the third grounding pin is connected to the second grounding pin and the vehicle ground wire at the same time, and the third grounding pin is grounded through the second grounding point.

[0017] In an embodiment, the second signal processing module and the third signal processing module are connected by an analog video signal line; the analog video signal line is provided with a shielding layer, and the second grounding pin and the third grounding pin are connected through the shielding layer.

[0018] A vehicle according to the third aspect of the present invention includes the surround-view controller in the first aspect of the present invention or the on-vehicle anti-interference video transmission system in the second aspect of the present invention. Its inventive concept is the same as that of the first aspect and the second aspect of the present invention. Therefore, it has all the technical improvements and technical effects of the first aspect and the second aspect of the present invention, and will not be elaborated here.

[0019] Other features and advantages of the present invention will be described in the following specification. Moreover, some of them will become apparent from the specification or be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the content specifically pointed out in the specification, claims, and drawings. Description of the Drawings

[0020] The drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation to the technical solution of the present invention.

[0021] Figure 1 is a schematic diagram of a convenient wiring method adopted by an in-vehicle video transmission system in the prior art;

[0022] Figure 2 is a schematic diagram of another wiring method adopted by an in-vehicle video transmission system in the prior art;

[0023] Figure 3 is a schematic diagram of an in-vehicle anti-interference video transmission system provided by an embodiment of the present invention;

[0024] Figure 4 is a schematic diagram of a surround view controller proposed by an embodiment of the present invention. Detailed Embodiment

[0025] Next, the technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the drawings in the present disclosure. These embodiments are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0026] It should be noted that in the description of the present disclosure, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more such features.

[0027] It should also be noted that if there are directional indications involved in the embodiments of the present disclosure, such as up, down, left, right, front, back, etc., then such directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (such as shown in the drawings). If this specific posture changes, the directional indications should also change accordingly.

[0028] In addition, unless otherwise clearly defined and limited, the term "connected / linked" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection or a connection that allows mutual communication; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components.

[0029] Finally, in the description of the present disclosure, the descriptions referring to terms such as "one embodiment / implementation", "another embodiment / implementation" or "certain embodiments / implementations" mean that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least two embodiments or implementations of the present disclosure. In the present disclosure, the schematic expressions of the above terms do not necessarily refer to the same exemplary embodiments or implementations. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or implementations.

[0030] The problems in the prior art will be elaborated below with reference to the accompanying drawings:

[0031] Analog signals use rows as the smallest unit, and multiple rows form a field, which is called a frame. As shown in the figure above is the waveform of a typical analog video signal for one row, which is composed of a horizontal sync pulse, a color burst, and the active video level synthesized through quadrature modulation, where:

[0032] Horizontal sync: It sends an alignment at the beginning of the row to the receiving end (sink), usually restricted to 200 - 300 mV. For the sink, there is only a difference between received and not received, and the anti-interference ability in this area is relatively strong;

[0033] Color burst: The color burst is the basis for quadrature modulation. For the sink, only the frequency and phase are checked, and it is not sensitive to the amplitude. And because of its relatively high carrier frequency, it is relatively insensitive to the low-frequency interference of the vehicle body;

[0034] Active video level: The active video level is actually the essence of the pixel signal for one row, which is composed of a luminance signal (low frequency) and a chrominance signal (high frequency with the same frequency as the color burst). For the low-frequency ground potential difference interference, the luminance signal is extremely vulnerable to the low-frequency interference of the vehicle body.

[0035] When the ground potential difference occurs, the waveforms of the video signals for multiple rows captured at the RX receiving end are shown. It is manifested as several rows being brighter and several rows being darker, and obvious bright and dark stripes appear in the whole picture.

[0036] As Figure 1 shown, Figure 1 is a schematic diagram of the convenient wiring method adopted by the in-vehicle video transmission system in the prior art.Figure 1 In the vehicle video transmission system, when the generator charges the vehicle body power supply and when high-power devices such as speakers / wipers / fans draw power from the vehicle body power supply, there will be an AC voltage drop on the parasitic inductance on the ground bus. The frequency of this AC voltage drop is usually at the kHz level, which will cause several lines of the analog signal to be higher / several lines to be lower, which will be reflected in the appearance of light and dark stripes on the screen.

[0037] like Figure 2 As shown, Figure 2 This is a schematic diagram of another wiring method used in the vehicle video transmission system in the prior art. Figure 2 , the car screen and the surround view controller are connected at the same point and grounded at a single point to eliminate the ground potential difference interference caused by parasitic inductance. However, this solution has the following defects:

[0038] First, there are requirements for the actual vehicle wiring. For truck application environments where the vehicle screen and the surround view controller are far apart, it is difficult to lay the wiring.

[0039] Secondly, in the actual vehicle environment, the body power supply is usually not an ideal constant voltage power supply. When the other electrical appliances in the vehicle body need to supply power due to high-power switches, the body level will present a state where AC is superimposed on a DC level. Since there are usually input decoupling capacitors on the surround view controller and the vehicle screen, ground potential difference interference will also occur in this case, and the single-point grounding countermeasure is ineffective in this case. That is, the premise for the effectiveness of the single-point grounding countermeasure is that the power supply is an ideal constant voltage source, but due to the complex electromagnetic environment of the vehicle body, the body power supply often has an AC component, resulting in this strategy being unable to completely solve the ground potential difference interference problem.

[0040] To solve Figure 2 The existing solution to the defects of the in-vehicle video transmission system is usually to add a step-down filter under the premise of single-point grounding. Since it needs to be added to the common power supply of the car screen and the surround view controller, this filter is often not integrated into the PCB of the surround view controller or the car screen, but presents an independent adapter cable connected in series to the car body power supply. This approach will increase costs and increase the actual vehicle process steps, which is not friendly to the cost-sensitive car product market.

[0041] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0042] like Figure 3 As shown, Figure 3 is a schematic diagram of a vehicle-mounted anti-interference video transmission system provided by an embodiment of the present invention. Figure 3In the example, the vehicle-mounted anti-interference video transmission system according to the embodiment of the present invention includes, but is not limited to, a surround view controller and a vehicle head unit. The surround view controller includes a digital ground part and an analog ground part, and the digital ground part and the analog ground part are grounded independently; the surround view controller further includes a first signal processing module and a second signal processing module. A decoder unit and a DAC unit are provided in the second signal processing module. The decoder unit is configured to receive the digital signal output by the first signal processing module and transmit the decoded digital signal to the DAC unit. The DAC unit is configured to convert the digital signal output by the decoder into an analog video signal and output it to the vehicle head unit; the first signal processing module is disposed in the digital ground part, and the second signal processing module is disposed in both the digital ground part and the analog ground part. Among them, the decoder unit is disposed in the digital ground part, and the DAC unit is disposed in the analog ground part to realize independent grounding of the decoder unit and the DAC unit; a third signal processing module is provided in the vehicle head unit, and the third signal processing module is connected to the second signal processing module for receiving the analog video signal output by the DAC unit.

[0043] It can be understood that for the vehicle-mounted anti-interference video transmission system according to the embodiment of the present invention, its surround view controller sets an analog ground part and a digital ground part with independent grounding, and makes the decoder unit and the DAC unit in the second signal processing module belong to the analog ground part and the digital ground part respectively, so that the reference ground level of the DAC unit can be independently obtained from the vehicle head unit end, then flows into the vehicle ground from the grounding point of the vehicle head unit end, and then is connected to the digital ground part of the surround view controller, that is, it ensures that the reference ground level of the DAC unit can be isolated from the reference ground level of the decoder unit, making it completely obtained from the vehicle head unit and transferring the potential difference to the digital signal with relatively strong anti-interference ability. Therefore, it can be ensured that when the power supply is superimposed with an AC part due to high-power electrical appliances, the ground potential difference is mainly generated in the digital ground part of the surround view controller. Since its analog ground part is isolated from the digital ground part and connected to the grounding point of the vehicle head unit end, that is, it is common-grounded with the vehicle head unit ground, it is basically not affected by this part of the ground potential difference, thus avoiding the problem that the video displayed on the vehicle head unit based on the analog video signal generates interference stripes and affects the video display effect. In addition, for the vehicle-mounted anti-interference video transmission system of the present invention, its wiring method is compatible with the existing conventional in-vehicle wiring method, and can improve the display effect by avoiding the generation of interference stripes while maintaining low production costs.

[0044] Further, the vehicle-mounted anti-interference video transmission system according to the embodiment of the present invention further includes a vehicle body ground wire, a first grounding point, and a second grounding point; the second signal processing module of the surround view controller is provided with a first grounding pin and a second grounding pin, the first grounding pin is arranged in the digital ground part, and the second grounding pin is arranged in the analog ground part; the first grounding pin is connected to the vehicle body ground wire and grounded through the first grounding point; the vehicle head unit is provided with a third grounding pin, the third grounding pin is connected to the second grounding pin and the vehicle body ground wire at the same time, and the third grounding pin is grounded through the second grounding point.

[0045] Specifically, the first signal processing module may be a system on chip (SOC) of the surround view controller, and the second control module may be an Encoder chip in the surround view controller.

[0046] Specifically, the pins of the decoder unit and the decoder unit of the Encoder chip for obtaining the reference level, that is, the first grounding pin, are all arranged in the digital ground part, and the pins of the DAC unit and the DAC unit of the Encoder chip for obtaining the reference level, that is, the second grounding pin, are all arranged in the analog ground part.

[0047] Specifically, the SOC may adopt the Allwinner T517 series SOC, and the Encoder chip may adopt the TP2915 chip or the XS5013 chip. It can be understood that the specific models of the SOC and the Encoder chip adopted in the embodiment of the present invention are not specifically limited.

[0048] Specifically, when the TP2915 chip is used as the Encoder chip, its PGND pin is the first grounding pin, and its AGND pin is the second grounding pin. The first grounding point is also the surround view controller ground commonly referred to in the industry, and the second grounding point is also the vehicle head unit ground commonly referred to in the industry.

[0049] In an embodiment, the second signal processing module and the third signal processing module are connected by an analog video signal line, the analog video signal line is provided with a shielding layer, and the second grounding pin and the third grounding pin are connected through the shielding layer. In the vehicle-mounted anti-interference video transmission system according to the embodiment of the present invention, the wiring method is equivalent to making a single ground at the unified grounding point of the analog ground part and the vehicle head unit ground, grounding the digital ground part separately, and connecting the analog ground part and the vehicle head unit ground through the shielding layer of the analog video signal line. In this way, the shielding layer of the analog video signal line is utilized, reducing the wiring cost and the assembly workload.

[0050] Specifically, the protocol for the surround view controller to transmit analog video signals to the in-vehicle infotainment system (IVI) can adopt the CVBS protocol, TVI protocol, or AHD. The IVI is provided with a Decoder chip, and the analog video signal output by the DAC unit is processed by the third signal processing module of the IVI, that is, the Decoder chip, and finally displayed on the IVI screen. The embodiments of the present invention do not specifically limit the protocol for the surround view controller to transmit analog video signals to the IVI.

[0051] It is worth noting that for the in-vehicle anti-interference video transmission system according to the embodiments of the present invention, the wiring method thereof Figure 1 can be kept consistent with the wiring method in the prior art shown, so as to facilitate external wiring, enabling the vehicle factory to avoid going to great lengths for single-point grounding, thereby reducing costs and assembly complexity while ensuring the video anti-interference effect.

[0052] The in-vehicle anti-interference video transmission system and application scenarios described in the embodiments of the present invention are for more clearly explaining the technical solutions of the embodiments of the present invention, and do not constitute a limitation on the technical solutions provided by the embodiments of the present invention. Those skilled in the art know that with the evolution of the in-vehicle anti-interference video transmission system and the emergence of new application scenarios, the technical solutions provided by the embodiments of the present invention are equally applicable to similar technical problems.

[0053] Those skilled in the art can understand that Figure 3 the in-vehicle anti-interference video transmission system shown in

[0054] does not constitute a limitation on the embodiments of the present invention, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0055] Referring to Figure 4 , Figure 4FIG. 0 is a schematic diagram of a surround view controller according to an embodiment of the present invention. The surround view controller is configured to receive and process analog video signals of multiple vehicle-mounted cameras and send the processed analog video signals to the vehicle head unit. It includes a digital ground part and an analog ground part, and the digital ground part and the analog ground part are grounded independently. The surround view controller further includes a first signal processing module and a second signal processing module. A decoder unit and a DAC unit are provided in the second signal processing module. The decoder unit is configured to receive the digital signal output by the first signal processing module and transmit the decoded digital signal to the DAC unit. The DAC unit is configured to convert the digital signal output by the decoder into an analog video signal and output it to the vehicle head unit. The first signal processing module is provided in the digital ground part, and the second signal processing module is provided in both the digital ground part and the analog ground part. Among them, the decoder unit is provided in the digital ground part, and the DAC unit is provided in the analog ground part to enable the decoder unit and the DAC unit to be grounded independently.

[0056] It can be understood that by providing an analog ground part and a digital ground part that are grounded independently, and enabling the decoder unit and the DAC unit in the second signal processing module to belong to the analog ground part and the digital ground part respectively, the reference ground level of the DAC unit can be independently obtained from the vehicle head unit end, then converge into the vehicle's overall ground from the ground connection point of the vehicle head unit end, and then be connected to the digital ground part of the surround view controller. That is, it ensures that the reference ground level of the DAC unit can be isolated from the reference ground level of the decoder unit, making it completely obtained from the vehicle head unit and transferring the potential difference to the digital signal with relatively strong anti-interference ability. Therefore, it can be ensured that when the power supply is superimposed with an AC part due to high-power electrical appliances, the ground potential difference is mainly generated in the digital ground part of the surround view controller. Its analog ground part is isolated from the digital ground part and connected to the ground connection point of the vehicle head unit end, that is, common-grounded with the vehicle head unit ground, so it is basically not affected by this part of the ground potential difference, thus avoiding the problem that the video displayed on the vehicle head unit based on the analog video signal generates interference stripes and affects the video display effect, while improving the user experience while maintaining the low-cost advantage.

[0057] Specifically, the second signal processing module is provided with a first ground pin and a second ground pin. The first ground pin is provided in the digital ground part, and the second ground pin is provided in the analog ground part.

[0058] Specifically, the first signal processing module may be a system on chip (SOC) of the surround view controller, and the second control module may be an Encoder chip in the surround view controller.

[0059] Specifically, the decoder unit of the encoder chip and the pin for the decoder unit to obtain the reference level, that is, the first ground pin are both set in the digital ground part, and the DAC unit of the encoder chip and the pin for the DAC unit to obtain the reference level, that is, the second ground pin are both set in the analog ground part.

[0060] Specifically, the SOC may adopt the Allwinner T517 series SOC, and the Encoder chip may adopt the TP2915 chip. It can be understood that the embodiment of the present invention does not specifically limit the specific models of the adopted SOC and Encoder chips.

[0061] It is understandable that the decoder unit in the encoder chip needs to communicate with the DAC unit to transmit the decoded digital signal to the DAC unit and then convert it into an analog video signal output by the DAC unit. However, the decoder unit and the DAC unit belong to the digital ground part and the analog ground part respectively. The devices in the digital ground part of the encoder are actually connected to the surround view controller ground, and the devices in the analog ground part are actually connected to the vehicle ground. Therefore, it is necessary to achieve electrical isolation between the decoder unit and the DAC unit of the encoder chip. Specifically, the decoder unit and the DAC unit are connected through an isolation device, and the isolation devices used include but are not limited to optocouplers, isolation transformers, magnetic couplers, etc.

[0062] Reference Figure 4 In one embodiment, a clamping circuit is provided between the digital ground part and the analog ground part of the surround view controller to prevent the second signal processing module from being burned due to an excessively large ground potential difference between the digital ground part and the analog ground part.

[0063] Specifically, the clamping circuit adopts a passive clamping circuit composed of a switching diode.

[0064] Furthermore, the clamping circuit uses a fast recovery switch diode. When the potential difference between the analog ground part and the digital ground part reaches 600mV, the fast recovery switch diode is turned on to balance the potential difference between the analog ground part and the digital ground part, thereby preventing the Encoder chip from being burned due to the large difference between the two grounds.

[0065] Reference Figure 4 In one embodiment, an electrostatic discharge path is provided between the digital ground portion and the analog ground portion of the surround view controller.

[0066] Specifically, the electrostatic discharge (ESD) release path includes a multi-layer ceramic capacitor (MLCC) disposed between the first ground pin and the second ground pin. The MLCC capacitor serves as the ESD release path and is connected between the digital ground part and the analog ground part of the surround view controller. Whether static electricity is generated in the digital ground part or the analog ground part, the capacitor can absorb the charge.

[0067] Specifically, a high-voltage-resistant capacitor device needs to be used as the ESD release path to avoid insufficient ESD capability. Therefore, an MLCC capacitor with a withstand voltage of 1000 nF is used.

[0068] It can be understood that, in addition to the MLCC capacitor, other high-voltage-resistant capacitor devices can also be used, and the embodiments of the present invention do not make specific limitations thereto.

[0069] In addition, the embodiments of the present invention also provide a vehicle, including the surround view controller or the vehicle-mounted anti-interference video transmission system in the embodiments of the present invention, and thus have all the technical improvements and technical effects of the present invention.

[0070] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0071] Those of ordinary skill in the art will understand that all or some of the steps and systems disclosed above in the methods can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and that can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, communication media typically includes computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery media.

[0072] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A surround view controller for receiving and processing analog video signals from multiple vehicle-mounted cameras and sending the processed analog video signals to the in-vehicle computer, characterized in that It includes a digital ground part and an analog ground part, and the digital ground part and the analog ground part are grounded independently; The surround view controller further includes a first signal processing module and a second signal processing module. A decoder unit and a DAC unit are provided in the second signal processing module. The decoder unit is configured to receive the digital signal output by the first signal processing module and transmit the decoded digital signal to the DAC unit. The DAC unit is configured to convert the digital signal output by the decoder into an analog video signal and output it to the vehicle head unit; The first signal processing module is provided in the digital ground part, and the second signal processing module is provided in both the digital ground part and the analog ground part. Among them, the decoder unit is provided in the digital ground part, and the DAC unit is provided in the analog ground part to achieve independent grounding of the decoder unit and the DAC unit.

2. The surround view controller according to claim 1, wherein A clamping circuit is provided between the digital ground part and the analog ground part to prevent the second signal processing module from being burned out due to an excessive ground potential difference between the digital ground part and the analog ground part.

3. The surround view controller according to claim 2, wherein The clamping circuit adopts a passive clamping circuit composed of switching diodes.

4. The surround view controller according to claim 1, wherein An electrostatic discharge (ESD) discharge path is provided between the digital ground part and the analog ground part.

5. The surround view controller according to claim 4, characterized in that, The second signal processing module is provided with a first ground pin and a second ground pin. The first ground pin is provided in the digital ground part, and the second ground pin is provided in the analog ground part. The ESD discharge path is provided between the first ground pin and the second ground pin.

6. The surround view controller according to claim 5, wherein The ESD discharge path includes a multilayer ceramic capacitor provided between the first ground pin and the second ground pin.

7. An in-vehicle anti-interference video transmission system, characterized in that, It includes a surround view controller and a vehicle head unit. The surround view controller includes a digital ground part and an analog ground part, and the digital ground part and the analog ground part are grounded independently; The surround view controller further includes a first signal processing module and a second signal processing module. A decoder unit and a DAC unit are provided in the second signal processing module. The decoder unit is configured to receive the digital signal output by the first signal processing module and transmit the decoded digital signal to the DAC unit. The DAC unit is configured to convert the digital signal output by the decoder into an analog video signal and output it to the vehicle head unit; The first signal processing module is provided in the digital ground part, and the second signal processing module is provided in both the digital ground part and the analog ground part. Among them, the decoder unit is provided in the digital ground part, and the DAC unit is provided in the analog ground part to achieve independent grounding of the decoder unit and the DAC unit; A third signal processing module is provided in the vehicle head unit. The third signal processing module is connected to the second signal processing module and is configured to receive the analog video signal output by the DAC unit.

8. The vehicle-mounted anti-interference video transmission system according to claim 7, wherein It further includes a vehicle body ground wire, a first grounding point, and a second grounding point; The second signal processing module of the panoramic view controller is provided with a first ground pin and a second ground pin. The first ground pin is disposed in the digital ground part, and the second ground pin is disposed in the analog ground part; While the first ground pin is connected to the vehicle body ground wire, it is grounded through the first grounding point; the vehicle head unit is provided with a third ground pin, and the third ground pin is connected to both the second ground pin and the vehicle body ground wire at the same time, and the third ground pin is grounded through the second grounding point.

9. The vehicle-mounted anti-interference video transmission system according to claim 8, characterized in that, The second signal processing module and the third signal processing module are connected by an analog video signal line; The analog video signal line is provided with a shielding layer, and the second ground pin and the third ground pin are connected through the shielding layer.

10. A vehicle, characterized in that, It includes the panoramic view controller according to any one of claims 1 to 6, or includes the in-vehicle anti-interference video transmission system according to any one of claims 7 to 9.

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