Multimedia extender

Abstract

The invention relates to an extender, in particular to a multimedia extender. The device comprises a sending unit and a receiving unit. Each of the transmitting unit and the receiving unit comprises a signal retiming chip, an MCU main control module and a POE power supply, the transmitting unit further comprises HDMI input equipment and an RJ45 output port, the receiving unit further comprises an RJ45 input port and HDMI output equipment, the signal retiming chips are applied, so that the stability of video signals is remarkably improved, signal attenuation in the remote transmission process is reduced, and the transmission efficiency is improved. A POE power supply technology is adopted, and a magnetic bead coupling mode is adopted, so that a function of transmitting a power supply to a receiving module through a network cable is realized, thereby eliminating a requirement of independent power supply at the receiving module, remarkably improving the transmission distance of a multimedia signal, reducing a problem of signal attenuation in a long-distance transmission process, and improving the transmission efficiency of the multimedia signal. And the stability and reliability of signal transmission are ensured.

Description

Technical Field

[0001] The invention relates to an extender, in particular to a multimedia extender. Background Art

[0002] An extender is a device specially designed to extend signal transmission. It usually consists of a transmitter and a receiver. The transmitter is responsible for acquiring and compressing the signal, while the receiver is responsible for decoding and allocating ports. This device is widely used in situations that require high-quality, long-distance signal transmission, such as large enterprises, outdoor large-screen display systems, corporate multimedia conferences, etc.

[0003] For example, CN108232509A relates to an interface extender, comprising: a first terminal 10, used to provide a terminal connected to a first interface in a first device to be connected; a second terminal 12, used to provide a terminal connected to a second interface in a second device to be connected, wherein the first terminal 10 is a hollow structure and the second terminal 12 is a terminal post; a conductive connecting rod 14, which passes through the first terminal 10 and the second terminal 12, and is used to connect the first terminal 10 and the second terminal 12.

[0004] Although the above-mentioned interface extender solves the technical problem of inconvenient connection with the cable terminal during the test process, it has a serious signal attenuation problem when applied to the field of HDMI video signal transmission, resulting in poor long-distance transmission of video signals and cannot meet actual needs.

[0005] Therefore, in order to reduce signal attenuation to support long-distance transmission of video signals, a multimedia extender is proposed. Summary of the invention

[0006] The object of the present invention is to provide a multimedia extender to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides a multimedia extender, comprising a sending unit and a receiving unit, wherein the sending unit and the receiving unit both comprise a signal retiming chip, an MCU main control module, and a POE power supply, the sending unit further comprises an HDMI input device and an RJ45 output port, the receiving unit further comprises an RJ45 input port and an HDMI output device, the HDMI input device is connected to the signal retiming chip, the signal retiming chip is connected to the RJ45 output port, the RJ45 output port is connected to the RJ45 input port, the RJ45 input port is connected to the signal retiming chip, the signal retiming chip is connected to the HDMI output device, the POE power supply of the sending unit is connected to the POE power supply of the receiving unit, and the MCU main control module is connected to the signal retiming chip;

[0008] The MCU main control module retimes the HDMI signal input by the HDMI input device through the signal retiming chip to synchronize the signal.

[0009] As a further improvement of the technical solution, the POE power supply of the sending unit is connected to the POE power supply of the receiving unit by means of magnetic bead coupling.

[0010] As a further improvement of the technical solution, the HDMI input device includes a terminal J3,

[0011] Pin 1 of the terminal J3 is connected to the HDMIRX2P terminal, pin 2 is connected to the HDMIRX2N terminal, pin 3 is connected to the HDMIRX1P terminal, pin 4 is connected to the HDMIRX1N terminal, pin 5 is connected to the HDMIRX0P terminal, pin 6 is connected to the HDMIRX0N terminal, pin 7 is connected to the HDMIRXCP terminal, and pin 8 is connected to the HDMIRXCN terminal;

[0012] Pins 9, 10 and 14 of the terminal J3 are all grounded;

[0013] The 12th pin of the terminal J3 is connected to the SCL1 terminal, the 13th pin is connected to the SDA1 terminal, and the 15th pin is connected to the RX5V terminal;

[0014] Pin 16 of the terminal J3 is connected to a resistor R14 and connected to the TP1 terminal, and the resistor R14 is connected to the HDMIRXHPD terminal.

[0015] As a further improvement of the technical solution, the signal retiming chip includes a chip U3,

[0016] Pin 1 of the chip U3 is connected to the HDMIRXCN terminal, pin 2 is connected to the HDMIRXCP terminal, pin 4 is connected to the HDMIRXON terminal, pin 5 is connected to the HDMIRXOP terminal, pin 7 is connected to the HDMIRX1N terminal, pin 8 is connected to the HDMIRX1P terminal, pin 10 is connected to the HDMIRX2N terminal, and pin 11 is connected to the HDMIRX2P terminal;

[0017] Pins 3 and 9 of the chip U3 are connected to the AVDDR1.2V terminal, pins 29 and 34 of the chip U3 are connected to the AVDDR1.2V terminal, pins 6 and 48 of the chip U3 are connected to the AVDDR3.3V terminal, pins 12 and 44 of the chip U3 are connected to the AVDDR3.3V terminal, pins 13, 43, 45 and 49 of the chip U3 are grounded, and pins 14 and 42 of the chip U3 are connected to the DVDD12V terminal;

[0018] Pin 15 of the chip U3 is connected to the RSTN terminal, pin 16 is connected to the SCL terminal, pin 17 is connected to the SDA terminal, pin 18 is connected to the OSC terminal, pin 19 is connected to the HDMIRXHPD terminal, pin 20 is connected to the resistor R24, pin 21 is connected to the RXDDCSDA terminal, pin 22 is connected to the RXDDCSDL terminal, the resistor R24 ​​is connected to the RX5V terminal, pin 26 is connected to the AVDDR3.3V terminal, pin 46 is connected to the INT terminal, pin 47 is connected to the resistor R15, and the resistor R15 is grounded;

[0019] Pin 27 of the chip U3 is connected to a resistor R23 and a capacitor C8, and the capacitor C8 is connected to the HDMIRXCN terminal;

[0020] Pin 28 of the chip U3 is connected to a resistor R22 and a capacitor C12, and the capacitor C12 is connected to the HDMIRXCP terminal;

[0021] Pin 30 of the chip U3 is connected to resistor R21 and capacitor C7, and the capacitor C7 is connected to the HDMIRXCP terminal;

[0022] Pin 31 of the chip U3 is connected to resistor R20 and capacitor C11, and the capacitor C11 is connected to the HDMI RX0N terminal;

[0023] Pin 32 of the chip U3 is connected to resistor R19 and capacitor C6, and the capacitor C6 is connected to the HDMIRX1N terminal;

[0024] Pin 33 of the chip U3 is connected to resistor R18 and capacitor C10, and the capacitor C10 is connected to the HDMIRX1P terminal;

[0025] Pin 35 of the chip U3 is connected to resistor R17 and capacitor C5, and the capacitor C5 is connected to the HDMIRX2N terminal;

[0026] Pin 36 of the chip U3 is connected to resistor R16 and capacitor C9, and the capacitor C9 is connected to the HDMIRX2P terminal;

[0027] The resistors R16, R17, R18, R19, R20, R21, R22, and R23 are all connected to the magnetic bead FB11, the magnetic bead FB11 is connected to the capacitors C13 and C14 and to the AVDDR3.3V end, and the capacitor C13 is connected to the other end of the capacitor C14 and to the ground.

[0028] As a further improvement of the technical solution, the MCU main control module includes a chip U2,

[0029] Pin 1 of the chip U2 is connected to a resistor R45 and a resistor R46, the resistor R45 is connected to the HDMI AUDIO terminal, and the resistor R46 is grounded;

[0030] Pin 2 of the chip U2 is connected to the TXD terminal, pin 3 is connected to the RXD terminal, pin 4 is connected to the NRST terminal, pin 9 is connected to the MV3.3V terminal, pin 11 is connected to the SDA terminal, pin 12 is connected to the SCL terminal, pin 14 is connected to the DDCSDA terminal, pin 15 is connected to the DDCSDL terminal, pin 18 is connected to the SWDLCK terminal, and pin 20 is connected to the INT terminal;

[0031] Pin 7 of the chip U2 is connected to capacitor C4 and grounded, and pin 8 is connected to the other end of the capacitor C4;

[0032] Pin 13 of the chip U2 is connected to resistor R6, pin 17 is connected to resistor R5, resistor R5 is connected to light emitting diode D1, resistor R6 is connected to light emitting diode D2, light emitting diode D1 is connected to the other end of light emitting diode D2 and connected to MV3.3V end;

[0033] Pin 19 of the chip U2 is connected to a resistor R47 and connected to the RSTN terminal, and the resistor R47 is connected to the MV3.3V terminal.

[0034] As a further improvement of the technical solution, the RJ45 output port includes a terminal J1,

[0035] Pin 0 and pin 9 of the terminal J1 are both grounded;

[0036] Pin 1 of the terminal J1 is connected to the HDMITX0N terminal, pin 2 is connected to the HDMITX0P terminal, pin 3 is connected to the HDMITXCP terminal, pin 4 is connected to the HDMITX1N terminal, pin 5 is connected to the HDMITX1P terminal, pin 6 is connected to the HDMITXCN terminal, pin 7 is connected to the HDMITX2N terminal, and pin 8 is connected to the HDMITX2P terminal.

[0037] As a further improvement of the technical solution, the POE power supply includes magnetic beads FB1 and FB2, wherein:

[0038] One end of the magnetic bead FB1 is connected to the HDMITX2P end, and the other end of the magnetic bead FB1 is connected to the FB2, capacitors C2 and C3 and connected to the 12V end;

[0039] The magnetic bead FB2 is connected to the N terminal of HDMITX2;

[0040] The capacitor C2 is connected to the other end of the capacitor C3 and is grounded.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] In this multimedia extender, the signal retiming chip is applied to significantly improve the stability of the video signal and reduce the signal attenuation during long-distance transmission. The POE power supply technology is adopted to realize the function of transmitting power to the receiving module through the network cable through magnetic bead coupling, thereby eliminating the need for separate power supply at the receiving module. It can significantly improve the transmission distance of multimedia signals, reduce the problem of signal attenuation during long-distance transmission, and ensure the stability and reliability of signal transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0044] Figure 2 It is a circuit diagram of the HDMI input device of the present invention;

[0045] Figure 3 The signal retiming chip circuit diagram of the present invention;

[0046] Figure 4 It is the circuit diagram of the MCU main control module of the present invention;

[0047] Figure 5 It is the circuit diagram of the RJ45 output port of the present invention;

[0048] Figure 6 This is a POE power supply circuit diagram of the present invention. DETAILED DESCRIPTION

[0049] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] With the advancement of technology and the reduction of display prices, the HDMI interface has become the most advanced multimedia interface standard in the world and is widely used in various electronic products. At present, not only graphics cards are generally equipped with HDMI interfaces, but also various video output devices support this interface. HDMI uses differential signal transmission technology, which requires the quality of the wire to be high enough to reduce signal attenuation. At present, the transmission distance of HDMI high-definition cables is about 10 to 20 meters, and as the cable length increases, the cost will increase accordingly. In actual use, we often encounter problems such as high cost, limited transmission distance and signal attenuation.

[0051] In order to increase the transmission distance of multimedia signals, reduce the problem of signal attenuation during long-distance transmission, reduce related costs, and ensure the stability and reliability of signal transmission, please refer to Figure 1-Figure 6 As shown, the purpose of this embodiment is to provide a multimedia extender, including a sending unit and a receiving unit, the sending unit and the receiving unit both include a signal retiming chip, an MCU main control module, and a POE power supply, the sending unit also includes an HDMI input device and an RJ45 output port, the receiving unit also includes an RJ45 input port and an HDMI output device, the HDMI input device is connected to the signal retiming chip, the signal retiming chip is connected to the RJ45 output port, the RJ45 output port is connected to the RJ45 input port, the RJ45 input port is connected to the signal retiming chip, the signal retiming chip is connected to the HDMI output device, the POE power supply of the sending unit is connected to the POE power supply of the receiving unit, and the MCU main control module is connected to the signal retiming chip;

[0052] The MCU main control module retimes the HDMI signal input by the HDMI input device through the signal retiming chip to synchronize the signal, improve transmission efficiency, and enhance signal stability.

[0053] The POE power supply of the sending unit is connected to the POE power supply of the receiving unit through magnetic bead coupling. Using the magnetic bead coupling method, 4 of the 8 Category 6 network cables are used to transmit power to the receiving module, and also provide working voltage for the receiving module, so that the receiving module does not need to be powered separately.

[0054] HDMI input device includes terminal J3,

[0055] Pin 1 of terminal J3 is connected to HDMIRX2P, pin 2 is connected to HDMIRX2N, pin 3 is connected to HDMIRX1P, pin 4 is connected to HDMIRX1N, pin 5 is connected to HDMIRX0P, pin 6 is connected to HDMIRX0N, pin 7 is connected to HDMIRXCP, and pin 8 is connected to HDMIRXCN;

[0056] Pins 9, 10, and 14 of terminal J3 are all grounded;

[0057] Pin 12 of terminal J3 is connected to SCL1, pin 13 is connected to SDA1, and pin 15 is connected to RX5V.

[0058] Pin 16 of terminal J3 is connected to resistor R14 and connected to TP1 terminal, and resistor R14 is connected to HDMIRXHPD terminal.

[0059] The signal retiming chip includes chip U3,

[0060] Pin 1 of chip U3 is connected to HDMIRXCN, pin 2 is connected to HDMIRXCP, pin 4 is connected to HDMIRXON, pin 5 is connected to HDMIRXOP, pin 7 is connected to HDMIRX1N, pin 8 is connected to HDMIRX1P, pin 10 is connected to HDMIRX2N, and pin 11 is connected to HDMIRX2P.

[0061] Pins 3 and 9 of chip U3 are connected to AVDDR1.2V terminal, pins 29 and 34 of chip U3 are connected to AVDDR1.2V terminal, pins 6 and 48 of chip U3 are connected to AVDDR3.3V terminal, pins 12 and 44 of chip U3 are connected to AVDDR3.3V terminal, pins 13, 43, 45 and 49 of chip U3 are grounded, and pins 14 and 42 of chip U3 are connected to DVDD12V terminal;

[0062] Pin 15 of chip U3 is connected to RSTN, pin 16 is connected to SCL, pin 17 is connected to SDA, pin 18 is connected to OSC, pin 19 is connected to HDMIRXHPD, pin 20 is connected to resistor R24, pin 21 is connected to RXDDCSDA, pin 22 is connected to RXDDCSDL, resistor R24 ​​is connected to RX5V, pin 26 is connected to AVDDR3.3V, pin 46 is connected to INT, pin 47 is connected to resistor R15, and resistor R15 is grounded;

[0063] Pin 27 of chip U3 is connected to resistor R23 and capacitor C8, and capacitor C8 is connected to the HDMIRXCN terminal;

[0064] Pin 28 of chip U3 is connected to resistor R22 and capacitor C12, and capacitor C12 is connected to the HDMIRXCP terminal;

[0065] Pin 30 of chip U3 is connected to resistor R21 and capacitor C7, and capacitor C7 is connected to the HDMIRXCP terminal;

[0066] Pin 31 of chip U3 is connected to resistor R20 and capacitor C11, and capacitor C11 is connected to the HDMIRX0N terminal;

[0067] Pin 32 of chip U3 is connected to resistor R19 and capacitor C6, and capacitor C6 is connected to the HDMIRX1N terminal;

[0068] Pin 33 of chip U3 is connected to resistor R18 and capacitor C10, and capacitor C10 is connected to the HDMIRX1P terminal;

[0069] Pin 35 of chip U3 is connected to resistor R17 and capacitor C5, and capacitor C5 is connected to the HDMIRX2N terminal;

[0070] Pin 36 of chip U3 is connected to resistor R16 and capacitor C9, and capacitor C9 is connected to the HDMIRX2P terminal;

[0071] Resistors R16, R17, R18, R19, R20, R21, R22, and R23 are all connected to magnetic bead FB11, magnetic bead FB11 is connected to capacitors C13 and C14 and to the AVDDR3.3V end, and capacitor C13 is connected to the other end of capacitor C14 and to ground.

[0072] The MCU main control module includes chip U2,

[0073] Pin 1 of chip U2 is connected to resistor R45 and resistor R46, resistor R45 is connected to the HDMI AUDIO terminal, and resistor R46 is grounded;

[0074] Pin 2 of chip U2 is connected to TXD, pin 3 is connected to RXD, pin 4 is connected to NRST, pin 9 is connected to MV3.3V, pin 11 is connected to SDA, pin 12 is connected to SCL, pin 14 is connected to DDCSDA, pin 15 is connected to DDCSDL, pin 18 is connected to SWDLCK, and pin 20 is connected to INT.

[0075] Pin 7 of chip U2 is connected to capacitor C4 and grounded, and pin 8 is connected to the other end of capacitor C4;

[0076] Pin 13 of chip U2 is connected to resistor R6, pin 17 is connected to resistor R5, resistor R5 is connected to light emitting diode D1, resistor R6 is connected to light emitting diode D2, light emitting diode D1 is connected to the other end of light emitting diode D2 and connected to MV3.3V terminal;

[0077] Pin 19 of chip U2 is connected to resistor R47 and connected to the RSTN terminal, and resistor R47 is connected to the MV3.3V terminal.

[0078] The RJ45 output port includes terminal J1,

[0079] Pin 0 and pin 9 of terminal J1 are both grounded;

[0080] Pin 1 of terminal J1 is connected to the HDMITX0N terminal, pin 2 is connected to the HDMITX0P terminal, pin 3 is connected to the HDMITXCP terminal, pin 4 is connected to the HDMITX1N terminal, pin 5 is connected to the HDMITX1P terminal, pin 6 is connected to the HDMITXCN terminal, pin 7 is connected to the HDMITX2N terminal, and pin 8 is connected to the HDMITX2P terminal.

[0081] The POE power supply includes magnetic beads FB1 and FB2, where:

[0082] One end of the magnetic bead FB1 is connected to the HDMITX2P end, and the other end of the magnetic bead FB1 is connected to FB2, capacitors C2 and C3 and connected to the 12V end;

[0083] Magnetic bead FB2 is connected to the HDMITX2N terminal;

[0084] Capacitor C2 is connected to the other end of capacitor C3 and is grounded.

[0085] The POE power supply is a 12V / 2A DC power supply, which provides working voltage for the transmitting module. The POE power supply is connected to the RJ45 port of the transmitting module. It adopts magnetic bead coupling and uses 4 of the 8 Category 6 network cables to transmit power to the receiving module. It also provides working voltage for the receiving module, so that the receiving module does not need to be powered separately.

[0086] A multimedia extender of the present invention, when used specifically, in the sending module, the HDMI video input interface of the HDMI input device is connected to the signal retiming chip, which is responsible for retiming the HDMI signal, ensuring signal synchronization, improving transmission efficiency, and enhancing signal stability. The MCU main control unit chip controls the signal retiming chip through the IIC bus, and then is connected to the RJ45 output port through the signal retiming chip, so that the signal can be transmitted through the differential line Ethernet cable. In addition, the sending module is powered by 12V DC, and four of the six categories of network cables are used for power transmission through magnetic bead coupling to provide working voltage for the receiving module.

[0087] In the receiving module, the RJ45 input port is connected to the signal retiming chip, which is responsible for retiming the HDMI signal to ensure the synchronization of the signal. The MCU main control unit chip controls the signal retiming chip through the IIC bus, and the signal retiming chip is then connected to the HDMI video output interface of the HDMI output device to communicate with the connected device. In addition, the POE power supply voltage of the sending module is transmitted to the receiving module to provide the required power for the receiving module.

[0088] In summary, the present invention significantly improves the stability of video signals and reduces signal attenuation during long-distance transmission by applying a signal retiming chip, effectively solving the limitation that the transmission distance of HDMI signals on the market is usually limited to 10 to 20 meters. In addition, the POE power supply technology is adopted to realize the function of transmitting power to the receiving module through the network cable by means of magnetic bead coupling, thereby eliminating the need for separate power supply at the receiving module. That is, the multimedia extender provided by the present invention can significantly improve the transmission distance of multimedia signals, while reducing the problem of signal attenuation during long-distance transmission, reducing related costs, and ensuring the stability and reliability of signal transmission.

[0089] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A multimedia extender, characterized in that: It includes a sending unit and a receiving unit, wherein the sending unit and the receiving unit both include a signal retiming chip, an MCU main control module, and a POE power supply. The sending unit also includes an HDMI input device and an RJ45 output port, and the receiving unit also includes an RJ45 input port and an HDMI output device. The HDMI input device is connected to the signal retiming chip, the signal retiming chip is connected to the RJ45 output port, the RJ45 output port is connected to the RJ45 input port, the RJ45 input port is connected to the signal retiming chip, the signal retiming chip is connected to the HDMI output device, the POE power supply of the sending unit is connected to the POE power supply of the receiving unit, and the MCU main control module is connected to the signal retiming chip; The MCU main control module retimes the HDMI signal input by the HDMI input device through the signal retiming chip to synchronize the signal.

2. The multimedia extender according to claim 1, characterized in that: The POE power supply of the sending unit is connected to the POE power supply of the receiving unit by means of magnetic bead coupling.

3. The multimedia extender according to claim 1, characterized in that: The HDMI input device includes a terminal J3, Pin 1 of the terminal J3 is connected to the HDMIRX2P terminal, pin 2 is connected to the HDMIRX2N terminal, pin 3 is connected to the HDMIRX1P terminal, pin 4 is connected to the HDMIRX1N terminal, pin 5 is connected to the HDMIRX0P terminal, pin 6 is connected to the HDMIRX0N terminal, pin 7 is connected to the HDMIRXCP terminal, and pin 8 is connected to the HDMIRXCN terminal; Pins 9, 10 and 14 of the terminal J3 are all grounded; The 12th pin of the terminal J3 is connected to the SCL1 terminal, the 13th pin is connected to the SDA1 terminal, and the 15th pin is connected to the RX5V terminal; Pin 16 of the terminal J3 is connected to a resistor R14 and connected to the TP1 terminal, and the resistor R14 is connected to the HDMIRXHPD terminal.

4. The multimedia extender according to claim 1, characterized in that: The signal retiming chip includes a chip U3, Pin 1 of the chip U3 is connected to the HDMIRXCN terminal, pin 2 is connected to the HDMIRXCP terminal, pin 4 is connected to the HDMIRXON terminal, pin 5 is connected to the HDMIRXOP terminal, pin 7 is connected to the HDMIRX1N terminal, pin 8 is connected to the HDMIRX1P terminal, pin 10 is connected to the HDMIRX2N terminal, and pin 11 is connected to the HDMIRX2P terminal; Pins 3 and 9 of the chip U3 are connected to the AVDDR1.2V terminal, pins 29 and 34 of the chip U3 are connected to the AVDDR1.2V terminal, pins 6 and 48 of the chip U3 are connected to the AVDDR3.3V terminal, pins 12 and 44 of the chip U3 are connected to the AVDDR3.3V terminal, pins 13, 43, 45 and 49 of the chip U3 are grounded, and pins 14 and 42 of the chip U3 are connected to the DVDD12V terminal; Pin 15 of the chip U3 is connected to the RSTN terminal, pin 16 is connected to the SCL terminal, pin 17 is connected to the SDA terminal, pin 18 is connected to the OSC terminal, pin 19 is connected to the HDMIRXHPD terminal, pin 20 is connected to the resistor R24, pin 21 is connected to the RXDDCSDA terminal, pin 22 is connected to the RXDDCSDL terminal, the resistor R24 ​​is connected to the RX5V terminal, pin 26 is connected to the AVDDR3.3V terminal, pin 46 is connected to the INT terminal, pin 47 is connected to the resistor R15, and the resistor R15 is grounded; Pin 27 of the chip U3 is connected to a resistor R23 and a capacitor C8, and the capacitor C8 is connected to the HDMIRXCN terminal; Pin 28 of the chip U3 is connected to a resistor R22 and a capacitor C12, and the capacitor C12 is connected to the HDMIRXCP terminal; Pin 30 of the chip U3 is connected to resistor R21 and capacitor C7, and the capacitor C7 is connected to the HDMIRXCP terminal; Pin 31 of the chip U3 is connected to resistor R20 and capacitor C11, and the capacitor C11 is connected to the HDMI RX0N terminal; Pin 32 of the chip U3 is connected to resistor R19 and capacitor C6, and the capacitor C6 is connected to the HDMIRX1N terminal; Pin 33 of the chip U3 is connected to resistor R18 and capacitor C10, and the capacitor C10 is connected to the HDMIRX1P terminal; Pin 35 of the chip U3 is connected to resistor R17 and capacitor C5, and the capacitor C5 is connected to the HDMIRX2N terminal; Pin 36 of the chip U3 is connected to resistor R16 and capacitor C9, and the capacitor C9 is connected to the HDMIRX2P terminal; The resistors R16, R17, R18, R19, R20, R21, R22, and R23 are all connected to the magnetic bead FB11, the magnetic bead FB11 is connected to the capacitors C13 and C14 and to the AVDDR3.3V end, and the capacitor C13 is connected to the other end of the capacitor C14 and to the ground.

5. The multimedia extender according to claim 1, characterized in that: The MCU main control module includes a chip U2, Pin 1 of the chip U2 is connected to a resistor R45 and a resistor R46, the resistor R45 is connected to the HDMI AUDIO terminal, and the resistor R46 is grounded; Pin 2 of the chip U2 is connected to the TXD terminal, pin 3 is connected to the RXD terminal, pin 4 is connected to the NRST terminal, pin 9 is connected to the MV3.3V terminal, pin 11 is connected to the SDA terminal, pin 12 is connected to the SCL terminal, pin 14 is connected to the DDCSDA terminal, pin 15 is connected to the DDCSDL terminal, pin 18 is connected to the SWDLCK terminal, and pin 20 is connected to the INT terminal; Pin 7 of the chip U2 is connected to capacitor C4 and grounded, and pin 8 is connected to the other end of the capacitor C4; Pin 13 of the chip U2 is connected to resistor R6, pin 17 is connected to resistor R5, resistor R5 is connected to light emitting diode D1, resistor R6 is connected to light emitting diode D2, light emitting diode D1 is connected to the other end of light emitting diode D2 and connected to MV3.3V end; Pin 19 of the chip U2 is connected to a resistor R47 and connected to the RSTN terminal, and the resistor R47 is connected to the MV3.3V terminal.

6. The multimedia extender according to claim 1, characterized in that: The RJ45 output port includes terminal J1, Pin 0 and pin 9 of the terminal J1 are both grounded; Pin 1 of the terminal J1 is connected to the HDMITX0N terminal, pin 2 is connected to the HDMITX0P terminal, pin 3 is connected to the HDMITXCP terminal, pin 4 is connected to the HDMITX1N terminal, pin 5 is connected to the HDMITX1P terminal, pin 6 is connected to the HDMITXCN terminal, pin 7 is connected to the HDMITX2N terminal, and pin 8 is connected to the HDMITX2P terminal.

7. The multimedia extender according to claim 1, characterized in that: The POE power supply includes magnetic beads FB1 and FB2, wherein: One end of the magnetic bead FB1 is connected to the HDMITX2P end, and the other end of the magnetic bead FB1 is connected to the FB2, capacitors C2 and C3 and connected to the 12V end; The magnetic bead FB2 is connected to the N terminal of HDMITX2; The capacitor C2 is connected to the other end of the capacitor C3 and is grounded.

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