Video transmission system and method based on vehicle-mounted Ethernet

Abstract

The invention provides a video transmission system and method based on a vehicle-mounted Ethernet, and the system comprises an image sensor which is used for collecting the video data of a monitoring region; the SOC is used for video data processing, coding compression and data sending; the first data link layer PHY1 adopts a gigabit Ethernet PHY chip and is used for receiving the data processed by the SOC module and transmitting the data to the data link layer PHY2; the second data link layer PHY2 adopts a vehicle-mounted Ethernet PHY chip and is used for receiving the data processed by the PHY1 module and transmitting the data to a vehicle-mounted computer through double lines; the connector terminal is used for being connected with a vehicle-mounted computer, transmitting the video information to the vehicle-mounted computer and providing a working power supply for the system; the image sensor and the SOC carry out transmission through an MIPI (Mobile Industry Processor Interface); data transmission is carried out between the SOC and the gigabit Ethernet PHY1 chip in a serial mode. Signal transmission is carried out between the PHY1 chip and the PHY2 chip through an RGMII interface. The purpose of high-speed long-distance transmission of video signals in the vehicle-mounted Ethernet is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle-mounted Internet, and in particular relates to a video transmission system and method based on vehicle-mounted Ethernet. Background Art

[0002] In the existing technology, with the popularization of intelligent automobiles, the Internet of Vehicles technology, that is, the communication between various electronic control units (ECUs) in the car, can also be understood as "in-vehicle communication based on Ethernet", meets the demand for high-bandwidth data in the in-vehicle network. With the development of technologies such as driver assistance systems (ADAS), automatic parking, and advanced infotainment systems, the current requirements for in-vehicle network bandwidth are getting higher and higher, which has exceeded the carrying capacity of traditional networks such as CAN (500kbit / s), CAN FD (2Mbit / s), and MOST (150Mbit / s). This has also promoted the rapid development and application of in-vehicle Ethernet technology.

[0003] The automotive intelligent visual perception system based on image sensors and deep learning neural network algorithms can achieve high-performance visual perception effects and greatly improve the recognition capabilities of various traffic conditions and driving scenarios, thereby achieving the purposes of assisted driving and safe driving.

[0004] The existing vehicle-mounted camera is a traditional analog surveillance camera that transmits 1080P analog high-definition video via coaxial cable. Its main technology is to use image sensor module, composite video encoding module and DAC module to process the collected digital video image information through the video encoding module, and then convert the real-time digital high-definition composite video into an analog composite video signal through the DAC module, and finally transmit the analog composite video signal to the vehicle-mounted monitoring system through a coaxial cable.

[0005] However, the existing vehicle-mounted cameras are analog high-definition cameras that transmit video via coaxial cables, which have the following disadvantages:

[0006] 1) The existing technology is a traditional analog camera, which only supports a maximum resolution of 1080P. The camera shooting effect will be affected by bad weather, weak light, reflection and other conditions. In rainy days, snowy days or at night, the shooting effect of the existing camera will become blurred and unclear, thus affecting the driving safety of the vehicle;

[0007] 2) The existing technology does not have a coding compression function, which increases the demand for video storage hard disk space, thereby increasing storage costs;

[0008] 3) The existing technology data stream will be converted into CAN bus to communicate with the driving computer. Faced with the current intelligent car multi-camera vision system, the transmission bandwidth is insufficient;

[0009] 4) In the prior art, data transmission and camera power supply need to be transmitted using separate wiring harnesses, which complicates the wiring of the entire vehicle and increases the weight and cost of the wiring harness of the entire vehicle.

[0010] In addition, common terms in the prior art include:

[0011] MIPI: An open standard and specification developed for mobile application processors. Camera image data can be transmitted via the MIPI protocol.

[0012] PHY: Physical, refers to the data link layer, responsible for transmitting and receiving data.

[0013] MAC: Media Access Control, which is a communication protocol. SOC: System on Chip, which is a system-level processor chip.

[0014] RGMII: Reduced Gigabit Media Independant Interface, which refers to the Gigabit Media Independent Interface, is the interface for communication between PHY and MAC.

[0015] MDI: Medium Dependent Interface, refers to the medium-dedicated interface, which is an interface for communication between PHYs.

[0016] PAM-3, or Pulse Amplitude Modulation, refers to pulse amplitude modulation. Summary of the invention

[0017] In order to solve the above problems, the purpose of this application is to provide a high-resolution, high-bandwidth, and low-latency transmission system to achieve high-speed and long-distance transmission of video signals in vehicle-mounted Ethernet. The technical problems solved by this application are as follows:

[0018] 1. This application utilizes the MIPI CSI interface function of Beijing Ingenic Integrated Circuit Co., Ltd. (hereinafter referred to as Ingenic) SOC, which can support up to 4K 30 frames of video input. In rainy days, snowy days or at night, the camera's shooting effect will be better and the details will be clearer; this is not available in the prior art;

[0019] 2. This application can compress the video size to half without losing image quality through the video encoding function of Ingenic SOC, which is beneficial for storage, which is not available in the prior art; 3. This application ensures the stability and smoothness of video transmission in the multi-camera vision system through the high bandwidth characteristics of Ingenic CG5316 vehicle Ethernet, enhances the interactive function of the vehicle, and improves driving safety, which is not available in the prior art;

[0020] 4. This application utilizes single-pair unshielded Ethernet full-duplex technology to realize that a pair of twisted-pair cables can complete the camera system power supply and video stream transmission functions, reducing the cost and weight of the wiring harness, which is not available in the prior art.

[0021] Specifically, the present invention provides a video transmission system based on vehicle-mounted Ethernet, the system comprising:

[0022] Image sensor, which uses 1 / 2.8-type 4K resolution stacked CMOS technology and Prior Low Noise Circuit (PLNC) technology, as well as its 6.43mm diagonal, to provide 8.4MP resolution and 3864(H)×2192(V) effective pixel count and 10-bit 90fps high-speed frame rate, giving it high light sensitivity and high low-light performance for collecting video data of surveillance areas;

[0023] The system-level processor chip SOC integrates a new generation of 4K resolution ISP and the latest H264 / H265 / JPEGComb video compression encoder, as well as a built-in single-port 10Base-T / 100Base-TX Ethernet physical layer transceiver for video data processing, encoding compression and data transmission;

[0024] The first data link layer PHY1, which uses advanced DSP technology and analog front end AFE, can achieve high-speed data transmission through UTP cable, is used to receive data processed by the SOC module and transmit the data to the data link layer PHY2;

[0025] The second data link layer PHY2 uses full-duplex, bidirectional communication and can achieve a data transmission rate of up to 1Gbit / s on a single pair of unshielded twisted pair cables. It is used to receive data processed by the PHY1 module and transmit the data to the on-board computer through two lines;

[0026] Connector terminal, used to connect to the on-board computer, transmit video information to the on-board computer, and provide working power to the system;

[0027] The image sensor and the SOC perform video data transmission via a MIPI interface;

[0028] The SOC and the Gigabit Ethernet PHY1 chip perform data transmission via a 100M Ethernet serial mode;

[0029] The PHY1 chip and the PHY2 chip transmit signals via the Gigabit Ethernet RGMII interface.

[0030] The serial mode includes connecting the SOC and the PHY1 through the MDI interface, connecting the TD_P interface of the SOC to the RD_P of the PHY1, connecting the TD_N of the SOC to the RD_N of the PHY1, connecting the RD_P of the SOC to the TD_P of the PHY1, and connecting the RD_N to the TD_N of the PHY1.

[0031] The signals of the RGMII interface include an RGMII-RX signal, an RGMII-TX signal and an RGMII-MDIO signal.

[0032] The PHY1 chip and the PHY2 chip transmit signals via the Gigabit Ethernet RGMII interface, and are connected via the RGMII interface, including:

[0033] The MDC, MDI0, TXCLK, TXD[0-3], TX_EN, RXCLK, RXD[0-3], and RX_EN interfaces of the PHY1 are respectively connected to the MDC, MDI0, TXCLK, TXD[0-3], TX_EN, RXCLK, RXD[0-3], and RX_EN interfaces corresponding to the PHY2.

[0034] The on-board computer includes an on-board Ethernet module and a power supply module. The on-board computer serves as the power supply end and the present system serves as the power receiving end. The on-board computer can power the present system via two lines. At the same time, the on-board computer can process, analyze and save the data transmitted from the present system in real time.

[0035] The system and the vehicle-mounted computer are transmitted via two-wires using a single pair of unshielded twisted-pair cables. The PI+ and PI- of the power receiving end of the system correspond to the PI+ and PI- of the power supply end connected to the vehicle-mounted computer; the MDI+ and MDI- of the connector terminals of the system correspond to the MDI+ and MDI- of the connector terminals connected to the vehicle-mounted computer.

[0036] The present application also relates to a video transmission method based on vehicle-mounted Ethernet, the method comprising the following steps:

[0037] S1, video signal acquisition, converting optical signals into electrical signals through image sensors and transmitting them to image processors for processing. The image sensor uses a starlight-level 4K ultra-clear pixel micro-image sensor photosensitive chip, and the image processor uses a SOC processor chip, which can encode and transmit image information;

[0038] S2, SOC transmits the video signal to the first data link layer PHY1 of Gigabit Ethernet through the MDI interface. The SOC integrates MAC and PHY. PHY is responsible for encoding the digital signal of MAC, converting it into an analog signal after serialization and sending it through the MDI interface. In order to effectively transmit the video data, the communication protocol adopted by the SOC and PHY1 module is TCP protocol transmission;

[0039] S3, Gigabit Ethernet PHY1 is connected to the second data link layer PHY2 chip of the vehicle Ethernet through the RGMII interface, and transmits the data to the vehicle Ethernet PHY2 through the parallel port; the RGMII adopts a 4-bit data interface, a working clock of 125MHz, and transmits data at the rising edge and the falling edge at the same time, so the transmission rate can reach 1000Mbps; RGMII is also compatible with the working mode specified by the medium independent interface MII, and supports transmission rates: 10Mbps / 100Mbps / 1000Mbp / s, and its corresponding clock signals are: 2.5MHz / 25MHz / 125MHz respectively;

[0040] S4, the automotive Ethernet PHY2 processes the data after receiving the RGMII data, converting the parallel data into serial data, and then converting it into a PAM-3 signal according to the encoding specifications of the physical layer, and finally communicating with the on-board computer through a connector terminal connected to a pair of unshielded twisted pair cables; S5, while the automotive Ethernet PHY2 communicates and transmits with the car end, the car, as the power supply end, is powered by the connection of the connector terminal. The two-wire power supply can realize the transmission of power on a single pair of twisted pair cables, and power the end devices of the network cable without the need for a separate power cord.

[0041] In the method, the image sensor adopts stacked CMOS technology and utilizes the photoelectric conversion function of photoelectric devices to convert the optical information collected by the camera into a sensor chip of a digital signal;

[0042] The image processor uses a SOC processor chip that integrates a new generation of 4K resolution ISP and the latest H264 / H265 / JPEG Comb video compression encoder, as well as a built-in single-port 10Base-T / 100Base-TX Ethernet physical layer transceiver;

[0043] The Gigabit Ethernet PHY1 adopts advanced DSP technology and analog front-end AFE, and is an Ethernet PHY chip that can realize high-speed data transmission through UTP cable;

[0044] The vehicle-mounted Ethernet PHY2 adopts a full-duplex, bidirectional communication mode and is an vehicle-mounted Ethernet PHY chip that can achieve a data transmission rate of up to 1 Gbit / s on a single pair of unshielded twisted pairs.

[0045] Therefore, the advantages of this application are:

[0046] 1) This application uses a high-resolution image sensor to adapt to complex weather scenes;

[0047] 2) This application uses the coding compression function of SOC to save the storage space of the on-board computer;

[0048] 3) This application uses in-vehicle Ethernet for data transmission, which ensures the stability and fluency of video transmission, enhances the interactive function of the vehicle, and improves driving safety;

[0049] 4) This application uses a single pair of unshielded twisted pair cables to facilitate vehicle wiring and reduce vehicle weight and wiring harness costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and do not constitute a limitation of the present invention.

[0051] Figure 1 It is a block diagram of the system involved in this application.

[0052] Figure 2 This is a schematic diagram of the communication connection between the SOC of the present application and the Gigabit Ethernet PHY1 chip through the MDI interface.

[0053] Figure 3 This is a schematic diagram of the communication connection between the Gigabit Ethernet PHY1 chip and the vehicle-mounted Ethernet PHY2 chip of the present application.

[0054] Figure 4 This is a schematic diagram of connecting the vehicle Ethernet PHY2 of the present application to the vehicle computer through a terminal connector.

[0055] Figure 5 This is a circuit schematic diagram of the system involved in this application as a power receiving end.

[0056] Figure 6 It is a flowchart of the method involved in this application. DETAILED DESCRIPTION

[0057] In order to more clearly understand the technical content and advantages of the present invention, the present invention is now further described in detail in conjunction with the accompanying drawings.

[0058] The embodiment of the present application is a video transmission system based on vehicle-mounted Ethernet, such as Figure 1 As shown, the system includes:

[0059] The image sensor

[02] adopts the Sony IMX415 chip, which has the following characteristics: it has a diagonal of 6.43 mm, provides a resolution of 8.4MP and an effective pixel number of 3864 (H) × 2192 (V) and a high-speed frame rate of 10 bits and 90fps, and adopts 1 / 2.8 type 4K resolution stacked CMOS technology and Prior Low Noise Circuit (PLNC) technology, which makes it have high light sensitivity and high low-light performance, and is used to collect video data of the monitoring area; it has a larger pixel size, which can provide higher light sensitivity and better low-light performance, and can produce clearer and brighter images at night or in low-light conditions;

[0060] The SOC

[01] uses the Ingenic T41N chip, which integrates a new generation of 4K resolution ISP and the latest H264 / H265 / JPEG Comb video compression encoder, as well as a built-in single-port 10Base-T / 100Base-TX Ethernet physical layer transceiver for video data processing, encoding compression, and data transmission;

[0061] The first data link layer PHY1

[03] uses the Yutai Micro YT8531 Gigabit Ethernet PHY chip, which uses advanced DSP technology and analog front end (AFE) to achieve high-speed data transmission through UTP cables. It is used to receive data processed by the SOC

[01] module and transmit the data to PHY2

[04] ;

[0062] The second data link layer PHY2

[04] adopts Ingenic CG5316 automotive Ethernet PHY chip, which features full-duplex and bidirectional communication, and can achieve a data transmission rate of up to 1Gbit / s on a single pair of unshielded twisted pair cables. It also has the characteristics of high reliability, low electromagnetic radiation, low power consumption, bandwidth allocation, and low latency in the automotive industry. It is used to receive data processed by the PHY1

[03] module and transmit the data to the on-board computer via two lines. It has the characteristics of high reliability, low electromagnetic radiation, low power consumption, bandwidth allocation, and low latency in the automotive industry.

[0063] The connector terminal

[11] is used to connect to the vehicle computer, transmit the video information to the vehicle computer, and provide working power to the system.

[0064] The image sensor and the SOC perform video data transmission via a MIPI interface;

[0065] like Figure 2 As shown, data is transmitted between the SOC

[01] and the Gigabit Ethernet PHY1

[03] chip via a 100M Ethernet serial method.

[0066] The serial mode includes connecting the SOC and the PHY1 through the MDI interface, connecting the TD_P interface of the SOC to the RD_P of the PHY1, connecting the TD_N of the SOC to the RD_N of the PHY1, connecting the RD_P of the SOC to the TD_P of the PHY1, and connecting the RD_N to the TD_N of the PHY1.

[0067] like Figure 3 As shown, the PHY1

[03] chip and the PHY2

[06] chip transmit signals via the Gigabit Ethernet RGMII interface, and the RGMII signal may include an RGMII-RX signal, an RGMII-TX signal, and an RGMII-MDIO signal. The connection between the RGMII interfaces includes: the MDC, MDI0, TXCLK, TXD[0-3], TX_EN, RXCLK, RXD[0-3], and RX_EN interfaces of the PHY1 are respectively connected to the MDC, MDI0, TXCLK, TXD[0-3], TX_EN, RXCLK, RXD[0-3], and RX_EN interfaces corresponding to the PHY2.

[0068] like Figure 4 As shown, the vehicle-mounted computer can include a vehicle-mounted Ethernet module and a power supply module. The vehicle-mounted computer serves as the power supply end and the system serves as the power receiving end. The vehicle-mounted computer can supply power to the system through two lines. At the same time, the vehicle-mounted computer can process, analyze and save the data transmitted by the system in real time. The system and the vehicle-mounted computer are transmitted via two lines and a single pair of unshielded twisted pair cables are used. The PI+ and PI- of the power receiving end of the system correspond to the PI+ and PI- of the power supply end connected to the vehicle-mounted computer respectively; the MDI+ and MDI- of the connector terminals of the system correspond to the MDI+ and MDI- of the connector terminals connected to the vehicle-mounted computer respectively.

[0069] like Figure 5 The figure shows the circuit schematic diagram of this system as the power receiving end.

[0070] like Figure 6 As shown, the specific implementation is as follows:

[0071] S1, video signal acquisition, converting the optical signal into an electrical signal through the image sensor

[02] , and transmitting it to the image processor for processing. In this embodiment, the image sensor

[02] adopts a starlight-level 4K ultra-clear pixel micro-image sensor photosensitive chip of model IMX415, and the image processor adopts a processor chip of SOC

[01] of model Ingenic T41N. SOC

[01] can encode and transmit image information.

[0072] S2, SOC

[01] transmits the video signal to Gigabit Ethernet PHY1

[05] through the MDI interface. In this embodiment, SOC

[01] integrates MAC and PHY internally. PHY is responsible for encoding and serializing the digital signal of MAC, and then converting it into an analog signal for transmission through the MDI interface. In order to effectively transmit the video data, the communication protocol adopted by SOC

[01] and PHY1

[03] modules is TCP protocol transmission, and Gigabit Ethernet PHY1

[05] adopts Ethernet PHY chip model YT8531.

[0073] S3, Gigabit Ethernet PHY1

[05] is connected to the vehicle Ethernet PHY2

[04] chip through RGMII, and transmits data to the vehicle Ethernet PHY[2] through the parallel port. RGMII uses a 4-bit data interface, a working clock of 125MHz, and transmits data at both the rising and falling edges, so the transmission rate can reach 1000Mbps. RGMII is also compatible with the working mode specified by the media independent interface (MII), and supports transmission rates of: 10Mbps / 100Mbps / 1000Mbp / s, and its corresponding clock signals are: 2.5MHz / 25MHz / 125MHz. In this embodiment, the vehicle Ethernet PHY2

[04] uses a vehicle Ethernet PHY chip with model number CG5316.

[0074] S4, the in-vehicle Ethernet PHY2

[04] processes the data after receiving the RGMII data by converting the parallel data into serial data, and then converting it into a PAM-3 signal according to the encoding specifications of the physical layer, and finally communicates with the in-vehicle computer through a connector terminal connected to a pair of unshielded twisted pair cables

[11] .

[0075] S5, while the vehicle Ethernet PHY2

[04] communicates with the vehicle end, the vehicle acts as a power supply end and supplies power to the present invention through the connection of the connector terminal

[11] . Figure 4 As shown, two-wire power supply can transmit power on a single twisted pair of cables, providing power to the devices at the end of the network cable without the need for a separate power cable.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A video transmission system based on vehicle Ethernet, characterized in that: The system includes: an image sensor, which uses 1 / 2.8-type 4K resolution stacked CMOS technology and Prior low-noise circuit PLNC technology, and its 6.43 mm diagonal, can provide 8.4MP resolution and 3864 (H) × 2192 (V) effective pixel count and 10-bit 90fps high-speed frame rate, making it highly light sensitive and highly low-light performance, for collecting video data of the surveillance area; System-on-chip (SOC), which integrates a new generation of 4K resolution ISP and the latest H264 / H265 / JPEG Comb video compression encoder, as well as a built-in single-port 10Base-T / 100Base-TX Ethernet physical layer transceiver for video data processing, encoding compression and data transmission; The first data link layer PHY1, which adopts DSP technology and analog front end AFE, can realize high-speed data transmission through UTP cable, is used to receive data processed by SOC module and transmit the data to data link layer PHY2; The second data link layer PHY2 adopts full-duplex, bidirectional communication mode and can achieve a data transmission rate of up to 1Gbit / s on a single pair of unshielded twisted pair cables. It is used to receive data processed by the PHY1 module and transmit the data to the on-board computer through two lines; Connector terminal, used to connect to the on-board computer, transmit video information to the on-board computer, and provide working power to the system; The image sensor and the SOC perform video data transmission via a MIPI interface; The SOC and the Gigabit Ethernet PHY1 chip perform data transmission via a 100M Ethernet serial mode; The PHY1 chip and the PHY2 chip perform signal transmission via a Gigabit Ethernet RGMII interface.

2. The video transmission system based on vehicle Ethernet according to claim 1, characterized in that: The serial mode includes connecting the SOC and the PHY1 through the MDI interface, connecting the TD_P interface of the SOC to the RD_P of the PHY1, connecting the TD_N of the SOC to the RD_N of the PHY1, connecting the RD_P of the SOC to the TD_P of the PHY1, and connecting the RD_N to the TD_N of the PHY1.

3. The video transmission system based on vehicle Ethernet according to claim 1, characterized in that: The signals of the RGMII interface include an RGMII-RX signal, an RGMII-TX signal and an RGMII-MDIO signal.

4. The video transmission system based on vehicle Ethernet according to claim 3, characterized in that: The PHY1 chip and the PHY2 chip transmit signals via the Gigabit Ethernet RGMII interface, and are connected via the RGMII interface, including: The MDC, MDI0, TXCLK, TXD[0-3], TX_EN, RXCLK, RXD[0-3], and RX_EN interfaces of the PHY1 are respectively connected to the MDC, MDI0, TXCLK, TXD[0-3], TX_EN, RXCLK, RXD[0-3], and RX_EN interfaces corresponding to the PHY2.

5. The video transmission system based on vehicle Ethernet according to claim 1, characterized in that: The on-board computer includes an on-board Ethernet module and a power supply module. The on-board computer serves as the power supply end and the present system serves as the power receiving end. The on-board computer can power the present system via two lines. At the same time, the on-board computer can process, analyze and save the data transmitted from the present system in real time.

6. A video transmission system based on vehicle Ethernet according to claim 5, characterized in that: The system and the vehicle-mounted computer are transmitted via two-wires using a single pair of unshielded twisted-pair cables. The PI+ and PI- of the power receiving end of the system correspond to the PI+ and PI- of the power supply end connected to the vehicle-mounted computer; the MDI+ and MDI- of the connector terminals of the system correspond to the MDI+ and MDI- of the connector terminals connected to the vehicle-mounted computer.

7. A video transmission method based on vehicle-mounted Ethernet, characterized in that: The method comprises the following steps: S1, video signal acquisition, converting optical signals into electrical signals through image sensors and transmitting them to image processors for processing. The image sensor uses a starlight-level 4K ultra-clear pixel micro-image sensor photosensitive chip, and the image processor uses a SOC processor chip, which can encode and transmit image information; S2, SOC transmits the video signal to the first data link layer PHY1 of Gigabit Ethernet through the MDI interface. The SOC integrates MAC and PHY. PHY is responsible for encoding the digital signal of MAC, converting it into an analog signal after serialization and sending it through the MDI interface. In order to effectively transmit the video data, the communication protocol adopted by the SOC and PHY1 module is TCP protocol transmission; S3, Gigabit Ethernet PHY1 is connected to the second data link layer PHY2 chip of the vehicle Ethernet through the RGMII interface, and transmits the data to the vehicle Ethernet PHY2 through the parallel port; the RGMII adopts a 4-bit data interface, a working clock of 125MHz, and transmits data at the rising edge and the falling edge at the same time, so the transmission rate can reach 1000Mbps; RGMII is also compatible with the working mode specified by the medium independent interface MII, and supports transmission rates: 10Mbps / 100Mbps / 1000Mbp / s, and its corresponding clock signals are: 2.5MHz / 25MHz / 125MHz respectively; S4, the in-vehicle Ethernet PHY2 processes the data after receiving the RGMII data, converting the parallel data into serial data, and then converting it into a PAM-3 signal according to the encoding specifications of the physical layer, and finally communicating with the in-vehicle computer through a connector terminal connected to a pair of unshielded twisted pair cables; S5, while the in-vehicle Ethernet PHY2 communicates with the car end, the car acts as the power supply end and supplies power through the connection of the connector terminal. The two-wire power supply can transmit power on a single pair of twisted pairs and supply power to the end devices of the network cable without the need for a separate power line.

8. The video transmission method based on vehicle Ethernet according to claim 7, characterized in that: In the method, The image sensor uses 1 / 2.8-type 4K resolution stacked CMOS technology and Prior low-noise circuit PLNC technology, as well as its 6.43mm diagonal, to provide 8.4MP resolution and 3864(H)×2192(V) effective pixel count and 10-bit 90fps high-speed frame rate, making it a sensor chip with high light sensitivity and high low-light performance; The image processor uses a SOC processor chip that integrates a new generation of 4K resolution ISP and the latest H264 / H265 / JPEG Comb video compression encoder, as well as a built-in single-port 10Base-T / 100Base-TX Ethernet physical layer transceiver; The Gigabit Ethernet PHY1 adopts advanced DSP technology and analog front-end AFE, and is an Ethernet PHY chip that can realize high-speed data transmission through UTP cable; The vehicle-mounted Ethernet PHY2 adopts a full-duplex, bidirectional communication mode and is an vehicle-mounted Ethernet PHY chip that can achieve a data transmission rate of up to 1 Gbit / s on a single pair of unshielded twisted pairs.

Images