Multimedia audio and video signal switcher

Abstract

The utility model relates to a signal switcher, in particular to a multimedia audio and video signal switcher, which comprises a power supply device and a video signal compatible device. According to the utility model, the matrix switching chip is adopted, mainstream audio and video interfaces in the market are unified on one panel, signal switching and distribution among different interfaces of a plurality of devices are realized, and especially in the aspect of audio and video signal processing, a plurality of HDMI input signals are switched into one output port. The utility model provides high convenience for use in environments such as conference rooms, multimedia classrooms, home theaters and the like, realizes audio and video switching, also performs interconnection control on peripherals such as output equipment projectors and the like, and is connected by built-in projector control codes of various brands in an MCU (Microprogrammed Control Unit) master controller FLASH through RS-232 serial communication. When the switcher switch is pressed down, a projector switch-on and switch-off code instruction is sent at the same time, and the projector switch-on and switch-off functions and the projection curtain lifting function are completed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a signal switcher, specifically, a kind of multimedia audio and video signal switcher. BACKGROUND

[0002] Multimedia audio and video signal switcher is a kind of electronic equipment, design is connected to single display device such as television, projector, display etc.

[0003] As CN105491305B involves a kind of intelligent multimedia signal switcher, including signal amplification distribution circuit, audio signal switching circuit, intelligent switching circuit, the signal amplification distribution circuit and audio signal switching circuit are connected with intelligent switching circuit, the intelligent switching circuit includes the notebook computer video interface for being connected with notebook computer, the desktop computer video interface for being connected with desktop computer, resistance R1 to resistance R9, triode Q1 to triode Q4, diode D1 to diode D4, first LED, second LED, first relay, second relay, third relay and direct current power supply. The volume of this multimedia signal switcher is small, easy to install, but compatible video interface is only notebook computer video interface, desktop computer video interface, compatible range is narrow, cannot satisfy actual demand.

[0004] To broaden the use field of switcher and improve the integration of interface, a kind of multimedia audio and video signal switcher is presented. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of multimedia audio and video signal switcher, to solve the problems presented in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides a kind of multimedia audio and video signal switcher, including power supply device and video signal compatible device, the power supply device includes the power supply unit for the power supply of the video signal compatible device, the video signal compatible device includes MCU main control unit, signal input conversion unit, matrix signal switching unit, signal output unit, display operation unit, serial communication unit, the MCU main control unit connects the display operation unit, the serial communication unit and the matrix signal switching unit, the matrix signal switching unit connects the signal input conversion unit and the signal output unit;

[0007] The MCU main control unit selects current video signal input device according to the input of the display operation unit and outputs, the MCU main control unit is also interconnected with projector by the serial communication unit Control.

[0008] As a further improvement of the technical solution, the display operation unit comprises keys K2, K3, K4, K5, K6, K7, K8 and LED indicator lights LED1, LED2, LED3, LED4, LED5, LED6, LED7, wherein:

[0009] The contact 4 of the keys K2, K6, K7, K8 is connected to the resistance R7, and the resistance R7 is connected to the DIG4 terminal. The contact 4 of the keys K3, K4, K5 is connected to the resistance R9, and the resistance R9 is connected to the DIG3 terminal.

[0010] The contact 3 of the key K2 is connected to the LIN1 terminal.

[0011] The contact 3 of the keys K3, K7 is connected to the LIN4 terminal.

[0012] The contact 3 of the keys K4, K8 is connected to the LIN5 terminal.

[0013] The contact 3 of the keys K5, K6 is connected to the LIN2 terminal.

[0014] The LED indicator lights LED1, LED2, LED3, LED4, LED5, LED6, LED7 are connected to the diode D1, and the diode D1 is connected to the DIGI terminal.

[0015] The other end of the LED indicator light LED1 is connected to the resistance R21, and the resistance R21 is connected to the LIN1 terminal.

[0016] The other end of the LED indicator light LED2 is connected to the resistance R22, and the resistance R21 is connected to the LIN2 terminal.

[0017] The other end of the LED indicator light LED3 is connected to the resistance R25, and the resistance R21 is connected to the LIN3 terminal.

[0018] The other end of the LED indicator light LED4 is connected to the resistance R26, and the resistance R21 is connected to the LIN4 terminal.

[0019] The other end of the LED indicator light LED5 is connected to the resistance R27, and the resistance R21 is connected to the LIN5 terminal.

[0020] The other end of the LED indicator light LED6 is connected to the resistance R28, and the resistance R21 is connected to the LIN6 terminal.

[0021] The other end of the LED indicator light LED7 is connected to the resistance R29, and the resistance R21 is connected to the LIN7 terminal.

[0022] As a further improvement of the technical solution, the power supply unit comprises a chip IC1,

[0023] The 1st pin of the chip IC1 is connected with the capacitor C52, the 2nd pin is connected with the resistor R34 and the capacitor C53 and is connected with the +12V terminal, the 3rd pin is connected with the inductor L4 and is connected with the other end of the capacitor C52, and the inductor L4 is connected with the capacitor C58 and is connected with the resistor R35;

[0024] The 4th pin of the chip IC1 is connected with the other end of the capacitor C53 and is connected with the ground;

[0025] The 5th pin of the chip IC1 is connected with the resistor R38 and is connected with the other end of the resistor R35, and the resistor R38 is connected with the ground;

[0026] The 6th pin of the chip IC1 is connected with the capacitor C56 and is connected with the capacitor C62, the capacitor C56 is connected with the resistor R39 and is connected with the ground, and the capacitor C62 is connected with the other end of the resistor R39;

[0027] The 7th pin of the chip IC1 is connected with the other end of the resistor R34;

[0028] The 8th pin of the chip IC1 is connected with the capacitor C61, and the capacitor C61 is connected with the ground.

[0029] As a further improvement of the technical solution, the signal input conversion unit comprises a chip IC3 and a terminal W1, wherein:

[0030] The 1st pin, the 41st pin and the 46th pin of the chip IC3 are all connected with the AV1.8_AD terminal, the 2nd pin and the 6th pin are all connected with the ground, the 5th pin and the 11th pin are all connected with the 3V3_M terminal, and the 7th pin is connected with the 1V8_M terminal;

[0031] The 8th pin of the chip IC3 is connected with the PC1_HPD terminal, the 12th pin is connected with the AV3.3 terminal, the 14th pin is connected with the PC1_TXC- terminal, the 15th pin is connected with the PC1_TXC+ terminal, the 16th pin and the 21st pin are all connected with the AV1.8_TX terminal, the 17th pin is connected with the PC1_TX0- terminal, the 18th pin is connected with the PC1_TX0+ terminal, the 19th pin is connected with the PC1_TX1- terminal, the 20th pin is connected with the PC1_TX1+ terminal, the 22nd pin is connected with the PC1_TX2- terminal, the 23rd pin is connected with the PC1_TX2+ terminal, and the 24th pin is connected with the 3V3_M terminal;

[0032] The 9th pin of the chip IC3 is connected with the resistor R89, and the resistor R89 is connected with the resistor R74 and is connected with the PC1_DDC_SDA terminal;

[0033] The 10th pin of the chip IC3 is connected with the resistor R86, and the resistor R86 is connected with the resistor R72 and is connected with the PC1_DDC_SCL terminal, and the resistor R72 is connected with the other end of the resistor R74 and is connected with the +5V terminal;

[0034] The 25-pin of the chip IC3 is connected with XTIN end, the 26-pin is connected with XTOUT end, the 27-pin is connected with ground, the 28-pin is connected with SCL end, the 29-pin is connected with SDA end, the 30-pin is connected with ALIN end, the 31-pin is connected with REFQ end, the 32-pin is connected with REF end, the 33-pin is connected with ARIN end, the 34-pin is connected with VGA1_HS end, the 35-pin is connected with VGA1_VS end, and the 36-pin is connected with 3V3_M end;

[0035] The 37-pin of the chip IC3 is connected with REFP end, the 38-pin, the 43-pin and the 47-pin are all connected with AV3.3 end, the 39-pin is connected with VGA1_IN_B end, the 40-pin, the 45-pin and the 49-pin are all connected with ground, the 42-pin is connected with SOG end, the 44-pin is connected with VGA1_IN_G end, and the 48-pin is connected with VGA1_IN_R end;

[0036] The 1-pin of the terminal W1 is connected with the resistance R97, the diode D8 and the capacitor C103, and the capacitor C103 is connected with VGA1_IN_R end;

[0037] The 2-pin of the terminal W1 is connected with the resistance R96, the diode D7 and the capacitor C98 and C102, the capacitor C98 is connected with VGA1_IN_G end, and the capacitor C102 is connected with SOG end;

[0038] The 3-pin of the terminal W1 is connected with the resistance R95, the diode D6 and the capacitor C97, and the capacitor C97 is connected with VGA1_IN_B end;

[0039] The 4-pin, the 5-pin, the 6-pin, the 7-pin, the 8-pin, the 10-pin, the 11-pin, the 16-pin and the 17-pin of the terminal W1 are all connected with the other end of the resistance R95, the other end of the resistance R96, the other end of the resistance R97 and ground;

[0040] The 9-pin of the terminal W1 is connected with PC1 VGA_5V end;

[0041] The diode D6 is connected with the other end of the diode D7, the other end of the diode D8 and ground;

[0042] The 12-pin of the terminal W1 is connected with VGA_IN_SDA end, and the 15-pin is connected with VGA_IN_SCL end;

[0043] The 13-pin of the terminal W1 is connected with the resistance R94, and the 14-pin is connected with the resistance R93, the resistance R93 is connected with the diode D9 and VGA1_VS end, the resistance R94 is connected with the diode D10 and VGA1_HS end, and the diode D9 is connected with the other end of the diode D10 and ground.

[0044] As a further improvement of the technical solution, the matrix signal switching unit comprises a chip U8 and a chip Y3, wherein:

[0045] The pin 1 of the chip U8 is connected with the SCKIN end, the pin 2 is connected with the SD0IN end, the pin 3 is connected with the WS0IIN end, the pin 4 is connected with the TXDC- end, the pin 5 is connected with the TXDC+ end, the pin 6 is connected with the TXD0- end, the pin 7 is connected with the TXD0+ end, the pin 8 is connected with the TXD1- end, the pin 9 is connected with the TXD1+ end, the pin 10 is connected with the TXD2- end, and the pin 11 is connected with the TXD2+ end;

[0046] The pin 12, the pin 31 and the pin 77 of the chip U8 are all connected with the CVDD10 end, the pin 13 and the pin 32 are all connected with the AVDD10 end, the pin 14 and the pin 33 are all connected with the AVDD33 end, the pin 15 is connected with the R1XCN end, the pin 16 is connected with the R1XCP end, the pin 17 is connected with the R1X0N end, the pin 18 is connected with the R1X0P end, the pin 19 is connected with the R1X1N end, the pin 20 is connected with the R1X1P end, the pin 21 is connected with the R1X2N end, the pin 22 is connected with the R1X2P end, the pin 23 is connected with the PC1_TXC- end, the pin 24 is connected with the PC1_TXC+ end, the pin 25 is connected with the PC1_TX0- end, the pin 26 is connected with the PC1_TX0+ end, the pin 27 is connected with the PC1_TX1- end, the pin 28 is connected with the PC1_TX1+ end, the pin 29 is connected with the PC1_TX2- end, and the pin 30 is connected with the PC1_TX2+ end;

[0047] The pin 34 of the chip U8 is connected with the resistance R237, and the resistance R237 is connected with the PWPMUX_OUT end;

[0048] The pin 35 of the chip U8 is connected with the resistance R240, and the pin 46 of the chip U8 is connected with the other end of the resistance R240 and the ground;

[0049] The pin 36 of the chip U8 is connected with the INT end, the pin 37 is connected with the UTX_SDA end, the pin 38 is connected with the UTX_SCL end, the pin 39 is connected with the UTX_HPD end, the pin 40 is connected with the resistance R147 and the capacitor C136 and the resistance R146, the resistance R146 is connected with the HDMITX_5V end, and the capacitor C136 is connected with the other end of the resistance R147 and the ground;

[0050] The pin 43 of the chip U8 is connected with the CEC end, the pin 44 is connected with the capacitor C218 and the capacitor C219 and the PWPMUX_OUT end, and the capacitor C218 is connected with the other end of the capacitor C219 and the ground;

[0051] The pin 45 of the chip U8 is connected with the capacitor C205 and the capacitor C206 and the resistance R8, the resistance R8 is connected with the +5V end, and the capacitor C205 is connected with the other end of the capacitor C206 and the ground;

[0052] The 47-pin of the chip U8 connects with the CSCL end, the 48-pin connects with the CSDA end, the 49-pin connects with the DSDA_1 end, the 50-pin connects with the DSCL_1 end, the 51-pin connects with the CBUS_HPD1 end, the 52-pin connects with the capacitor C138 and connects with the resistor R233, R235, the resistor R233 connects with the RPWR,_1 end, the capacitor C138 connects with the resistor R235 and connects with the ground;

[0053] The 53-pin of the chip U8 connects with the PC1_DDC_SDA end, the 54-pin connects with the PC1_DDC_SCL end, the 55-pin connects with the PC1_HPD end, the 56-pin connects with the capacitor C139 and connects with the resistor R234, R236, the resistor C139 connects with the resistor R236 and connects with the ground;

[0054] The 57-pin of the chip U8 connects with the TX_SDA end, the 58-pin connects with the TX_SCL end, the 59-pin connects with the TX_HPD end, the 62-pin connects with the APLL10 end, the 63-pin connects with the XTALVCC33 end,

[0055] The 64-pin of the chip U8 connects with the resistor R238, the capacitor C141 and connects with the 3-pin of the chip Y3, the capacitor C141 connects with the 4-pin of the chip Y3 and connects with the ground, the 65-pin of the chip U8 connects with the capacitor C142, the 1-pin of the chip Y3 and connects with the other end of the resistor R238, the capacitor C142 connects with the 2-pin of the chip Y3 and connects with the ground;

[0056] The 66-pin and the 89-pin of the chip U8 all connect with the ground, the 67-pin connects with the FTPVDD10 end, the 68-pin connects with the TXC- end, the 69-pin connects with the TXC+ end, the 70-pin connects with the TX0- end, the 71-pin connects with the TX0+ end, the 72-pin connects with the TDVDD10 end, the 73-pin connects with the TX1- end, the 74-pin connects with the TX1+ end, the 75-pin connects with the TX2- end, the 76-pin connects with the TX2+ end, the 79-pin connects with the WS end, the 80-pin connects with the SCLK end, the 81-pin connects with the SD end, the 82-pin connects with the MCLK end, the 87-pin connects with the SPDIF_OUT end.

[0057] As a further improvement of the technical solution, the signal output unit comprises a chip J3,

[0058] The 1-pin of the chip J3 connects with the TX2+ end, the 2-pin connects with the TX2- end, the 3-pin connects with the TX1+ end, the 4-pin connects with the TX1- end, the 5-pin connects with the TX0+ end, the 6-pin connects with the TX0- end, the 7-pin connects with the TXC+ end, the 8-pin connects with the TXC- end, the 12-pin connects with the TX_SDA end, the 13-pin connects with the TX_SCL end;

[0059] The 9-pin, the 10-pin and the 14-pin of the chip J3 all connect with the ground;

[0060] The 15-pin of the chip J3 connects with the capacitor C113 and connects with the TX5V end, the capacitor C113 connects with the ground.

[0061] The 16-pin resistor R103 of the chip J3 is connected with the TX_HPD end, and the resistor R103 is grounded.

[0062] As a further improvement of the technical solution, the serial communication unit comprises chips IC4 and IC5, wherein:

[0063] The 1-pin capacitor C71 of the chip IC4 is connected with the other end of the capacitor C71, and the 3-pin of the chip IC4 is connected with the other end of the capacitor C72.

[0064] The 2-pin capacitor C66 of the chip IC4 is connected with the other end of the capacitor C66, and the 16-pin of the chip IC4 is connected with the other end of the capacitor C65 and the +5V end, and the capacitor C65 is grounded.

[0065] The 4-pin capacitor C72 of the chip IC4 is connected with the other end of the capacitor C72, and the 5-pin of the chip IC4 is connected with the other end of the capacitor C72.

[0066] The 6-pin capacitor C69 of the chip IC4 is connected with the ground.

[0067] The 7-pin of the chip IC4 is connected with the TXD2 end, the 8-pin is connected with the RXD2 end, the 9-pin is connected with the RX2 end, the 10-pin is connected with the TX2 end, the 11-pin is connected with the TIN_1 end, the 12-pin is connected with the RX1 end, the 13-pin is connected with the RXD1 end, the 14-pin is connected with the TOUT_1 end, and the 15-pin is grounded.

[0068] The 1-pin capacitor C75 of the chip IC5 is connected with the other end of the capacitor C75, and the 3-pin of the chip IC5 is connected with the other end of the capacitor C75.

[0069] The 2-pin capacitor C68 of the chip IC5 is connected with the other end of the capacitor C68, and the 16-pin of the chip IC5 is connected with the other end of the capacitor C67 and the +5V end, and the capacitor C67 is grounded.

[0070] The 4-pin capacitor C75 of the chip IC5 is connected with the other end of the capacitor C74, and the 5-pin of the chip IC5 is connected with the other end of the capacitor C74.

[0071] The 6-pin capacitor C70 of the chip IC5 is connected with the ground.

[0072] The 7-pin of the chip IC5 is connected with the TOUT_4 end, the 10-pin is connected with the TIN_4 end, the 11-pin is connected with the TIN_2 end, and the 15-pin is grounded.

[0073] Compared with the prior art, the utility model has the advantages of:

[0074] The multimedia audio and video signal switcher adopts a matrix switching chip, unifies mainstream audio and video interfaces on a panel, realizes signal switching and distribution between different interfaces of multiple devices, especially in the processing of audio and video signals, it switches multiple HDMI input signals to an output port. It provides high convenience in conference rooms, multimedia classrooms, home theaters and other environments, and also controls the output device projector and other peripherals while realizing audio and video switching. Through the built-in control codes of various brands of projectors in the MCU main controller FLASH, the projector on-off code instructions are sent through the RS-232 serial communication connection when the switcher is turned on and off, and the projector on-off and projection screen lifting functions are completed. BRIEF DESCRIPTION OF DRAWINGS

[0075] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0076] Figure 2 It is a display operation unit circuit of the utility model Figure One ;

[0077] Figure 3 It is a display operation unit circuit of the utility model Figure Two

[0078] Figure 4 It is a power supply unit circuit diagram of the utility model;

[0079] Figure 5 It is a signal input conversion unit circuit of the utility model Figure One ;

[0080] Figure 6 It is a signal input conversion unit circuit of the utility model Figure Two ;

[0081] Figure 7 It is a matrix signal switching unit circuit of the utility model Figure One ;

[0082] Figure 8 It is a matrix signal switching unit circuit of the utility model Figure Two ;

[0083] Figure 9 It is a signal output unit circuit diagram of the utility model;

[0084] Figure 10 It is a serial communication unit circuit of the utility model Figure One ;

[0085] Figure 11 It is a serial communication unit circuit of the utility model Figure Two . DETAILED DESCRIPTION

[0086] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0087] With the popularization of high-definition video technology and the rapid development of the industry, the promotion of new technologies such as 2K / 4K Ultra HD video, large-screen display equipment, and the increasing number of interfaces for transmitting high-definition video, such as VGA, HDMI, DP, Type-C, DVI, etc. In order to meet the diverse needs of users, multimedia audio and video switches also develop towards higher integration, integrating various audio and video processing functions in one device, realizing multi-interface, multi-application switching, improving the performance and work efficiency of the device, and meeting the needs of users for high-quality audio and video experience.

[0088] Therefore, please refer to Figures 1-11 The embodiment provides a kind of multimedia audio and video signal switch, including power supply device and video signal compatible device, power supply device includes the power supply unit for the power supply of video signal compatible device, video signal compatible device includes MCU main control unit, signal input conversion unit, matrix signal switching unit, signal output unit, display operation unit, serial communication unit, MCU main control unit is connected display operation unit, serial communication unit and matrix signal switching unit, matrix signal switching unit is connected signal input conversion unit and signal output unit;

[0089] MCU main control unit selects current video signal input equipment according to the input of display operation unit and exports, MCU main control unit is also interconnected with projector by serial communication unit Control.

[0090] Display operation unit includes key K2, K3, K4, K5, K6, K7, K8 and LED indicator light LED1, LED2, LED3, LED4, LED5, LED6, LED7, wherein:

[0091] The contact 4 of key K2, K6, K7, K8 is all connected with resistance R7, resistance R7 is connected with DIG4 end, the contact 4 of key K3, K4, K5 is all connected with resistance R9, resistance R9 is connected with DIG3 end;

[0092] The contact 3 of key K2 is connected with LIN1 end;

[0093] The contact 3 of key K3, K7 is all connected with LIN4 end;

[0094] The contact 3 of the key K4, K8 is connected to the LIN5 end;

[0095] The contact 3 of the key K5, K6 is connected to the LIN2 end;

[0096] The LED indicator lamp LED1, LED2, LED3, LED4, LED5, LED6, LED7 is connected to the diode D1, and the diode D1 is connected to the DIGI end;

[0097] The other end of the LED indicator lamp LED1 is connected to the resistor R21, and the resistor R21 is connected to the LIN1 end;

[0098] The other end of the LED indicator lamp LED2 is connected to the resistor R22, and the resistor R21 is connected to the LIN2 end;

[0099] The other end of the LED indicator lamp LED3 is connected to the resistor R25, and the resistor R21 is connected to the LIN3 end;

[0100] The other end of the LED indicator lamp LED4 is connected to the resistor R26, and the resistor R21 is connected to the LIN4 end;

[0101] The other end of the LED indicator lamp LED5 is connected to the resistor R27, and the resistor R21 is connected to the LIN5 end;

[0102] The other end of the LED indicator lamp LED6 is connected to the resistor R28, and the resistor R21 is connected to the LIN6 end;

[0103] The other end of the LED indicator lamp LED7 is connected to the resistor R29, and the resistor R21 is connected to the LIN7 end.

[0104] The IO port of the MCU main control unit is connected to each key, and each key corresponds to the audio and video signals of each input device. Pressing the key indicates selecting the current input device, and the corresponding LED indicator lamp is lit. The volume of the output audio signal can also be controlled through the volume key.

[0105] The power supply unit includes a chip IC1,

[0106] The 1 pin of the chip IC1 is connected to the capacitor C52, the 2 pin is connected to the resistor R34 and the capacitor C53 and connected to the +12V end, the 3 pin is connected to the inductor L4 and the other end of the capacitor C52, and the inductor L4 is connected to the capacitor C58 and the resistor R35;

[0107] The 4 pin of the chip IC1 is connected to the other end of the capacitor C53 and connected to the ground;

[0108] The 5 pin of the chip IC1 is connected to the resistor R38 and the other end of the resistor R35, and the resistor R38 is connected to the ground;

[0109] The 6-pin of the chip IC1 is connected with the capacitor C56 and the capacitor C62, the capacitor C56 is connected with the resistor R39 and the ground, and the capacitor C62 is connected with the other end of the resistor R39;

[0110] The 7-pin of the chip IC1 is connected with the other end of the resistor R34;

[0111] The 8-pin of the chip IC1 is connected with the capacitor C61, and the capacitor C61 is connected with the ground.

[0112] The power input adopts DC-12V 1A power supply, and the voltage is converted into 5V, 3.3V and 1.2V by the DC-DC step-down chip for use of each unit circuit, for example, the power supply voltage of the MCU main control unit and the serial port communication adopts 5V, the power supply voltage of the matrix signal switching unit adopts 3.3V and 1.2V, etc. In this way, the power supply of the whole system is completed, and the complete operation of the system is ensured.

[0113] The signal input conversion unit includes the chip IC3 and the terminal W1, wherein:

[0114] The 1-pin, 41-pin and 46-pin of the chip IC3 are connected with the AV1.8_AD end, the 2-pin and 6-pin are connected with the ground, the 5-pin and 11-pin are connected with the 3V3_M end, and the 7-pin is connected with the 1V8_M end;

[0115] The 8-pin of the chip IC3 is connected with the PC1_HPD end, the 12-pin is connected with the AV3.3 end, the 14-pin is connected with the PC1_TXC- end, the 15-pin is connected with the PC1_TXC+ end, the 16-pin and 21-pin are connected with the AV1.8_TX end, the 17-pin is connected with the PC1_TX0- end, the 18-pin is connected with the PC1_TX0+ end, the 19-pin is connected with the PC1_TX1- end, the 20-pin is connected with the PC1_TX1+ end, the 22-pin is connected with the PC1_TX2- end, and the 23-pin is connected with the PC1_TX2+ end,

[0116] The 24-pin of the chip IC3 is connected with the 3V3_M end;

[0117] The 9-pin of the chip IC3 is connected with the resistor R89, and the resistor R89 is connected with the resistor R74 and the PC1_DDC_SDA end;

[0118] The 10-pin of the chip IC3 is connected with the resistor R86, and the resistor R86 is connected with the resistor R72 and the PC1_DDC_SCL end, and the resistor R72 is connected with the other end of the resistor R74 and the +5V end;

[0119] The 25-pin of the chip IC3 is connected with the XTIN end, the 26-pin is connected with the XTOUT end, the 27-pin is connected with the ground, the 28-pin is connected with the SCL end, the 29-pin is connected with the SDA end, the 30-pin is connected with the ALIN end, the 31-pin is connected with the REFQ end, the 32-pin is connected with the REF end, the 33-pin is connected with the ARIN end, the 34-pin is connected with the VGA1_HS end, the 35-pin is connected with the VGA1_VS end, and the 36-pin is connected with the 3V3_M end;

[0120] Pin 37 of chip IC3 is connected to REF P terminal, pins 38, 43 and 47 are connected to AV 3.3 terminal, pin 39 is connected to VGA1_IN_B terminal, pins 40, 45 and 49 are connected to ground, pin 42 is connected to SOG terminal, pin 44 is connected to VGA1_IN_G terminal, and pin 48 is connected to VGA1_IN_R terminal;

[0121] Pin 1 of terminal W1 is connected to resistor R97, diode D8 and capacitor C103, and capacitor C103 is connected to VGA1_IN_R terminal;

[0122] Pin 2 of terminal W1 is connected to resistor R96, diode D7 and capacitors C98 and C102, capacitor C98 is connected to VGA1_IN_G terminal, and capacitor C102 is connected to SOG terminal;

[0123] Pin 3 of terminal W1 is connected to resistor R95, diode D6 and capacitor C97, and capacitor C97 is connected to VGA1_IN_B terminal;

[0124] Pins 4, 5, 6, 7, 8, 10, 11, 16 and 17 of terminal W1 are connected to the other end of resistor R95, the other end of resistor R96 and the other end of resistor R97 and to ground;

[0125] Pin 9 of terminal W1 is connected to PC1 VGA_5V terminal;

[0126] Diode D6 is connected to the other end of diode D7 and the other end of diode D8 and to ground;

[0127] Pin 12 of terminal W1 is connected to VGA_IN_SDA terminal, and pin 15 is connected to VGA_IN_SCL terminal;

[0128] Pin 13 of terminal W1 is connected to resistor R94, and pin 14 is connected to resistor R93, resistor R93 is connected to diode D9 and to VGA1_VS terminal, resistor R94 is connected to diode D10 and to VGA1_HS terminal, diode D9 is connected to the other end of diode D10 and to ground.

[0129] The signal input is composed of audio and video ports of different interfaces, such as an HDMI port, a Type-C port and a VGA port. Due to the performance requirements of the matrix chip, the signals of the three interfaces need to be converted into HDMI signals, so the Type-C and VGA need to be converted in sequence. For the conversion of Type-C to HDMI, the CS5268 chip is used, which is a single-chip integrated expansion dock solution chip of TYPEC to HDMI 4K30HZ + VGA 1080P + PD + USB3.0, and a single chip can realize HDMI + VGA display. For the conversion of VGA to HDMI, the MS9288A chip is used, which is a low-cost, low-power and high-performance VGA to HDMI chip with three 10-bit video ADCs, an HDMI transmitter and an audio encoder. It supports left / right channel audio input.

[0130] The matrix signal switching unit includes a chip U8 and a chip Y3, wherein:

[0131] Pin 1 of the chip U8 is connected to the SCKIN terminal, pin 2 is connected to the SD0IN terminal, pin 3 is connected to the WS0IIN terminal, pin 4 is connected to the TXDC- terminal, pin 5 is connected to the TXDC+ terminal, pin 6 is connected to the TXD0- terminal, pin 7 is connected to the TXD0+ terminal, pin 8 is connected to the TXD1- terminal, pin 9 is connected to the TXD1+ terminal, pin 10 is connected to the TXD2- terminal, and pin 11 is connected to the TXD2+ terminal.

[0132] The pins 12, 31 and 77 of the chip U8 are all connected to the CVDD10 terminal, the pins 13 and 32 are all connected to the AVDD10 terminal, the pins 14 and 33 are all connected to the AVDD33 terminal, the pin 15 is connected to the R1XCN terminal, the pin 16 is connected to the R1XCP terminal, the pin 17 is connected to the R1X0N terminal, the pin 18 is connected to the R1X0P terminal, the pin 19 is connected to the R1X1N terminal, the pin 20 is connected to the R1X1P terminal, the pin 21 is connected to the R1X2N terminal, the pin 22 is connected to the R1X2P terminal, the pin 23 is connected to the PC1_TXC- terminal, the pin 24 is connected to the PC1_TXC+ terminal, the pin 25 is connected to the PC1_TX0- terminal, the pin 26 is connected to the PC1_TX0+ terminal, the pin 27 is connected to the PC1_TX1- terminal, the pin 28 is connected to the PC1_TX1+ terminal, the pin 29 is connected to the PC1_TX2- terminal, and the pin 30 is connected to the PC1_TX2+ terminal.

[0133] The pin 34 of the chip U8 is connected to the resistor R237, and the resistor R237 is connected to the PWPMUX_OUT terminal.

[0134] The pin 35 of the chip U8 is connected to the resistor R240, and the pin 46 of the chip U8 is connected to the other end of the resistor R240 and grounded.

[0135] Pin 36 of chip U8 is connected with INT, pin 37 is connected with UTX_SDA, pin 38 is connected with UTX_SCL, pin 39 is connected with UTX_HPD, pin 40 is connected with resistor R147 and capacitor C136 and resistor R146, resistor R146 is connected with HDMI TX_5V, capacitor C136 is connected with the other end of resistor R147 and ground;

[0136] Pin 43 of chip U8 is connected with CEC, pin 44 is connected with capacitor C218 and C219 and PWPMUX_OUT, capacitor C218 is connected with the other end of capacitor C219 and ground;

[0137] Pin 45 of chip U8 is connected with capacitor C205 and C206 and resistor R8, resistor R8 is connected with +5V, capacitor C205 is connected with the other end of capacitor C206 and ground;

[0138] Pin 47 of chip U8 is connected with CSCL, pin 48 is connected with CSDA, pin 49 is connected with DSDA_1, pin 50 is connected with DSCL_1, pin 51 is connected with CBUS_HPD1, pin 52 is connected with capacitor C138 and resistor R233 and R235, resistor R233 is connected with RPWR,_1, capacitor C138 is connected with the other end of resistor R235 and ground;

[0139] Pin 53 of chip U8 is connected with PC1_DDC_SDA, pin 54 is connected with PC1_DDC_SCL, pin 55 is connected with PC1_HPD, pin 56 is connected with capacitor C139 and resistor R234 and R236, resistor C139 is connected with the other end of resistor R236 and ground;

[0140] Pin 57 of chip U8 is connected with TX_SDA, pin 58 is connected with TX_SCL, pin 59 is connected with TX_HPD, pin 62 is connected with APLL10, pin 63 is connected with XTALVCC33,

[0141] Pin 64 of chip U8 is connected with resistor R238 and capacitor C141 and pin 3 of chip Y3, capacitor C141 is connected with pin 4 of chip Y3 and ground, pin 65 of chip U8 is connected with capacitor C142 and pin 1 of chip Y3 and the other end of resistor R238, capacitor C142 is connected with pin 2 of chip Y3 and ground;

[0142] Pin 66 and 89 of chip U8 are both connected with ground, pin 67 is connected with FTPVDD10, pin 68 is connected with TXC-, pin 69 is connected with TXC+, pin 70 is connected with TX0-, pin 71 is connected with TX0+, pin 72 is connected with TDVDD10, pin 73 is connected with TX1-, pin 74 is connected with TX1+, pin 75 is connected with TX2-, pin 76 is connected with TX2+, pin 79 is connected with WS, pin 80 is connected with SCLK, pin 81 is connected with SD, pin 82 is connected with MCLK, pin 87 is connected with SPDIF_OUT.

[0143] The matrix switching unit adopts a 3-to-1 matrix chip SIL9533, which supports 3-way HDMI signal input, 1-way HDMI signal output, and can select to separate the audio signal, which is connected with a DAC chip through I2S and separately accesses the sound playing.

[0144] The signal output unit includes a chip J3,

[0145] Pin 1 of the chip J3 is connected with TX2+ end, pin 2 is connected with TX2- end, pin 3 is connected with TX1+ end, pin 4 is connected with TX1- end, pin 5 is connected with TX0+ end, pin 6 is connected with TX0- end, pin 7 is connected with TXC+ end, pin 8 is connected with TXC- end, pin 12 is connected with TX_SDA end, and pin 13 is connected with TX_SCL end;

[0146] Pin 9, pin 10 and pin 14 of the chip J3 are grounded;

[0147] Pin 15 of the chip J3 is connected with a capacitor C113 and TX5V end, and the capacitor C113 is grounded;

[0148] Pin 16 of the chip J3 is connected with a resistor R103 and TX_HPD end, and the resistor R103 is grounded.

[0149] The video signal output adopts HDMI port output, and the audio signal output adopts 3.5mm audio socket.

[0150] The serial communication unit includes chips IC4 and IC5, wherein:

[0151] Pin 1 of the chip IC4 is connected with a capacitor C71, and pin 3 of the chip IC4 is connected with the other end of the capacitor C71;

[0152] Pin 2 of the chip IC4 is connected with a capacitor C66, pin 16 of the chip IC4 is connected with the other end of the capacitor C66 and +5V end, and the capacitor C65 is grounded;

[0153] Pin 4 of the chip IC4 is connected with a capacitor C72, and pin 5 of the chip IC4 is connected with the other end of the capacitor C72;

[0154] Pin 6 of the chip IC4 is connected with a capacitor C69, and the capacitor C69 is grounded;

[0155] Pin 7 of the chip IC4 is connected with TXD2 end, pin 8 is connected with RXD2 end, pin 9 is connected with RX2 end, pin 10 is connected with TX2 end, pin 11 is connected with TIN_1 end, pin 12 is connected with RX1 end, pin 13 is connected with RXD1 end, pin 14 is connected with TOUT_1 end, and pin 15 is grounded;

[0156] Pin 1 of the chip IC5 is connected with a capacitor C75, and pin 3 of the chip IC5 is connected with the other end of the capacitor C75;

[0157] Capacitor C68 of 2-pin of chip IC5, capacitor C67 of 16-pin of chip IC5, other end of capacitor C68 and +5V end, capacitor C67 is grounded;

[0158] Capacitor C75 of 4-pin of chip IC5, other end of capacitor C74 of 5-pin of chip IC5 is connected;

[0159] Capacitor C70 of 6-pin of chip IC5, capacitor C70 is grounded;

[0160] TOUT_4 end of 7-pin of chip IC5, 10-pin TIN_4 end, 11-pin TIN_2 end, 15-pin is grounded.

[0161] Serial communication passes through ST232 serial chip, converts MCU main controller TTL level into RS232C level, adopts three-wire connection method and is connected with projection equipment with serial port, realizes interconnection control to projection by setting its baud rate, built-in relevant parameters such as control code of various brand projectors, such as: control projection one-key on-off, control projection curtain lifting, etc.

[0162] The utility model mainly solves the input and output switching of multiple audio and video signals, integrates the complicated converter on a panel, which is very practical in some occasions, such as: multimedia classroom in school, office conference room, etc., it can switch and distribute various audio and video signal devices such as projector, computer, sound, camera, etc., the operator only needs to operate on a panel to complete the signal switching of all connected devices, greatly simplifies the operation process, not only saves time, but also improves efficiency.

[0163] The utility model also has RS232 communication interface, can more conveniently and intelligently control the lifting and switch of various brand projectors, is more convenient to use.

[0164] In conclusion, the utility model relates to accurate and flexible switching and distribution of video signal and audio signal, is widely used in multimedia classroom, home theater, conference room, etc., these application scenarios have different requirements for the performance, function and stability of audio and video switcher, promote the sustained development and innovation of industry.

[0165] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A multimedia audio and video signal switcher, characterized by: The power supply device and the video signal compatible device, the power supply device includes a power supply unit for powering the video signal compatible device, the video signal compatible device includes MCU main control unit, signal input conversion unit, matrix signal switching unit, signal output unit, display operation unit, serial communication unit, the MCU main control unit is connected with the display operation unit, the serial communication unit and the matrix signal switching unit, the matrix signal switching unit is connected with the signal input conversion unit and the signal output unit; The MCU main control unit selects the current video signal input device according to the input of the display operation unit and outputs, and the MCU main control unit is interconnected with the projector through the serial communication unit.

2. The multimedia audio / video signal switcher of claim 1, wherein: The display operation unit includes keys K2, K3, K4, K5, K6, K7, K8 and LED indicator lights LED1, LED2, LED3, LED4, LED5, LED6, LED7, wherein: The contact 4 of the keys K2, K6, K7 and K8 is connected with the resistance R7, and the resistance R7 is connected with the DIG4 end; the contact 4 of the keys K3, K4 and K5 is connected with the resistance R9, and the resistance R9 is connected with the DIG3 end; The contact 3 of the key K2 is connected with the LIN1 end; The contact 3 of the keys K3 and K7 is connected with the LIN4 end; The contact 3 of the keys K4 and K8 is connected with the LIN5 end; The contact 3 of the keys K5 and K6 is connected with the LIN2 end; The LED indicator lights LED1, LED2, LED3, LED4, LED5, LED6 and LED7 are connected with the diode D1, and the diode D1 is connected with the DIGI end; The other end of the LED indicator light LED1 is connected with the resistance R21, and the resistance R21 is connected with the LIN1 end; The other end of the LED indicator light LED2 is connected with the resistance R22, and the resistance R21 is connected with the LIN2 end; The other end of the LED indicator light LED3 is connected with the resistance R25, and the resistance R21 is connected with the LIN3 end; The other end of the LED indicator light LED4 is connected with the resistance R26, and the resistance R21 is connected with the LIN4 end; The other end of the LED indicator light LED5 is connected with the resistance R27, and the resistance R21 is connected with the LIN5 end; The other end of the LED indicator light LED6 is connected with the resistance R28, and the resistance R21 is connected with the LIN6 end; The other end of the LED indicator light LED7 is connected with the resistance R29, and the resistance R21 is connected with the LIN7 end.

3. The multimedia audio / video signal switcher of claim 1, wherein: The power supply unit includes a chip IC1, The 1 pin of the chip IC1 is connected with the capacitor C52, the 2 pin is connected with the resistance R34 and the capacitor C53 and is connected with the +12V end, the 3 pin is connected with the inductor L4 and the other end of the capacitor C52, and the inductor L4 is connected with the capacitor C58 and the resistance R35; The 4 pin of the chip IC1 is connected with the other end of the capacitor C53 and is connected with the ground; The 5 pin of the chip IC1 is connected with the resistance R38 and the other end of the resistance R35, and the resistance R38 is connected with the ground; The 6-pin of the chip IC1 connects with the capacitor C56 and the capacitor C62, the capacitor C56 connects with the resistor R39 and the ground, and the capacitor C62 connects with the other end of the resistor R39; The 7-pin of the chip IC1 connects with the other end of the resistor R34; The 8-pin of the chip IC1 connects with the capacitor C61, and the capacitor C61 connects with the ground.

4. The multimedia audio / video signal switcher of claim 1, wherein: The signal input conversion unit comprises a chip IC3 and a terminal W1, wherein: The 1-pin, 41-pin and 46-pin of the chip IC3 all connect with the AV1.8_AD end, the 2-pin and 6-pin all connect with the ground, the 5-pin and 11-pin all connect with the 3V3_M end, and the 7-pin connects with the 1V8_M end; The 8-pin of the chip IC3 connects with the PC1_HPD end, the 12-pin connects with the AV3.3 end, the 14-pin connects with the PC1_TXC- end, the 15-pin connects with the PC1_TXC+ end, the 16-pin and 21-pin all connect with the AV1.8_TX end, the 17-pin connects with the PC1_TX0- end, the 18-pin connects with the PC1_TX0+ end, the 19-pin connects with the PC1_TX1- end, the 20-pin connects with the PC1_TX1+ end, the 22-pin connects with the PC1_TX2- end, the 23-pin connects with the PC1_TX2+ end, and the 24-pin connects with the 3V3_M end; The 9-pin of the chip IC3 connects with the resistor R89, and the resistor R89 connects with the resistor R74 and the PC1_DDC_SDA end; The 10-pin of the chip IC3 connects with the resistor R86, and the resistor R86 connects with the resistor R72 and the PC1_DDC_SCL end, and the resistor R72 connects with the other end of the resistor R74 and the +5V end; The 25-pin of the chip IC3 connects with the XTIN end, the 26-pin connects with the XTOUT end, the 27-pin connects with the ground, the 28-pin connects with the SCL end, the 29-pin connects with the SDA end, the 30-pin connects with the ALIN end, the 31-pin connects with the REFQ end, the 32-pin connects with the REF end, the 33-pin connects with the ARIN end, the 34-pin connects with the VGA1_HS end, the 35-pin connects with the VGA1_VS end, and the 36-pin connects with the 3V3_M end; The 37-pin of the chip IC3 connects with the REFP end, the 38-pin, 43-pin and 47-pin all connect with the AV3.3 end, the 39-pin connects with the VGA1_IN_B end, the 40-pin, 45-pin and 49-pin all connect with the ground, the 42-pin connects with the SOG end, the 44-pin connects with the VGA1_IN_G end, and the 48-pin connects with the VGA1_IN_R end; The 1-pin of the terminal W1 connects with the resistor R97, diode D8 and the capacitor C103, and the capacitor C103 connects with the VGA1_IN_R end; The 2-pin of the terminal W1 connects with the resistor R96, diode D7, capacitor C98 and C102, the capacitor C98 connects with the VGA1_IN_G end, and the capacitor C102 connects with the SOG end; The 3-pin of the terminal W1 connects with the resistor R95, diode D6 and the capacitor C97, and the capacitor C97 connects with the VGA1_IN_B end; The 4-pin, 5-pin, 6-pin, 7-pin, 8-pin, 10-pin, 11-pin, 16-pin and 17-pin of the terminal W1 all connect with the other end of the resistor R95, the other end of the resistor R96, the other end of the resistor R97 and the ground; The 9-pin of the terminal W1 connects with the PC1 VGA_5V end; The diode D6 is connected to the other end of the diode D7, the other end of the diode D8 and the ground; The 12th pin of the terminal W1 is connected to the VGA_IN_SDA terminal, and the 15th pin is connected to the VGA_IN_SCL terminal; The 13th pin of the terminal W1 is connected to the resistor R94, and the 14th pin is connected to the resistor R93, the resistor R93 is connected to the diode D9 and the VGA1_VS terminal, the resistor R94 is connected to the diode D10 and the VGA1_HS terminal, and the diode D9 is connected to the other end of the diode D10 and the ground.

5. The multimedia audio / video signal switcher of claim 1, wherein: The matrix signal switching unit comprises a chip U8 and a chip Y3, wherein: The 1st pin of the chip U8 is connected to the SCKIN terminal, the 2nd pin is connected to the SD0IN terminal, the 3rd pin is connected to the WS0IIN terminal, the 4th pin is connected to the TXDC- terminal, the 5th pin is connected to the TXDC+ terminal, the 6th pin is connected to the TXD0- terminal, the 7th pin is connected to the TXD0+ terminal, the 8th pin is connected to the TXD1- terminal, the 9th pin is connected to the TXD1+ terminal, the 10th pin is connected to the TXD2- terminal, and the 11th pin is connected to the TXD2+ terminal; The 12th pin, the 31st pin and the 77th pin of the chip U8 are all connected to the CVDD10 terminal, the 13th pin and the 32nd pin are all connected to the AVDD10 terminal, the 14th pin and the 33rd pin are all connected to the AVDD33 terminal, the 15th pin is connected to the R1XCN terminal, the 16th pin is connected to the R1XCP terminal, the 17th pin is connected to the R1X0N terminal, the 18th pin is connected to the R1X0P terminal, the 19th pin is connected to the R1X1N terminal, the 20th pin is connected to the R1X1P terminal, the 21st pin is connected to the R1X2N terminal, the 22nd pin is connected to the R1X2P terminal, the 23rd pin is connected to the PC1_TXC- terminal, the 24th pin is connected to the PC1_TXC+ terminal, the 25th pin is connected to the PC1_TX0- terminal, the 26th pin is connected to the PC1_TX0+ terminal, the 27th pin is connected to the PC1_TX1- terminal, the 28th pin is connected to the PC1_TX1+ terminal, the 29th pin is connected to the PC1_TX2- terminal, and the 30th pin is connected to the PC1_TX2+ terminal; The 34th pin of the chip U8 is connected to the resistor R237, and the resistor R237 is connected to the PWPMUX_OUT terminal; The 35th pin of the chip U8 is connected to the resistor R240, and the 46th pin of the chip U8 is connected to the other end of the resistor R240 and the ground; The 36th pin of the chip U8 is connected to the INT terminal, the 37th pin is connected to the UTX_SDA terminal, the 38th pin is connected to the UTX_SCL terminal, the 39th pin is connected to the UTX_HPD terminal, the 40th pin is connected to the resistor R147 and the capacitor C136, and the resistor R146 is connected to the HDMITX_5V terminal, and the capacitor C136 is connected to the other end of the resistor R147 and the ground; The 43rd pin of the chip U8 is connected to the CEC terminal, the 44th pin is connected to the capacitor C218 and C219, and the PWPMUX_OUT terminal is connected to the other end of the capacitor C219 and the ground; The 45th pin of the chip U8 is connected to the capacitor C205 and C206, and the resistor R8 is connected to the +5V terminal, and the capacitor C205 is connected to the other end of the capacitor C206 and the ground; The 47-pin of the chip U8 connects with the CSCL end, the 48-pin connects with the CSDA end, the 49-pin connects with the DSDA_1 end, the 50-pin connects with the DSCL_1 end, the 51-pin connects with the CBUS_HPD1 end, the 52-pin connects with the capacitor C138 and the resistor R233, R235, the resistor R233 connects with the RPWR,_1 end, the capacitor C138 connects with the resistor R235 and the ground; The 53-pin of the chip U8 connects with the PC1_DDC_SDA end, the 54-pin connects with the PC1_DDC_SCL end, the 55-pin connects with the PC1_HPD end, the 56-pin connects with the capacitor C139 and the resistor R234, R236, the resistor C139 connects with the resistor R236 and the ground; The 57-pin of the chip U8 connects with the TX_SDA end, the 58-pin connects with the TX_SCL end, the 59-pin connects with the TX_HPD end, the 62-pin connects with the APLL10 end, the 63-pin connects with the XTALVCC33 end, The 64-pin of the chip U8 connects with the resistor R238 and the capacitor C141 and the 3-pin of the chip Y3, the capacitor C141 connects with the 4-pin of the chip Y3 and the ground, the 65-pin of the chip U8 connects with the capacitor C142, the 1-pin of the chip Y3 and the other end of the resistor R238, the capacitor C142 connects with the 2-pin of the chip Y3 and the ground; The 66-pin and the 89-pin of the chip U8 connect with the ground, the 67-pin connects with the FTPVDD10 end, the 68-pin connects with the TXC- end, the 69-pin connects with the TXC+ end, the 70-pin connects with the TX0- end, the 71-pin connects with the TX0+ end, the 72-pin connects with the TDVDD10 end, the 73-pin connects with the TX1- end, the 74-pin connects with the TX1+ end, the 75-pin connects with the TX2- end, the 76-pin connects with the TX2+ end, the 79-pin connects with the WS end, the 80-pin connects with the SCLK end, the 81-pin connects with the SD end, the 82-pin connects with the MCLK end, the 87-pin connects with the SPDIF_OUT end.

6. The multimedia audio / video signal switcher of claim 1, wherein: The signal output unit comprises a chip J3, The 1-pin of the chip J3 connects with the TX2+ end, the 2-pin connects with the TX2- end, the 3-pin connects with the TX1+ end, the 4-pin connects with the TX1- end, the 5-pin connects with the TX0+ end, the 6-pin connects with the TX0- end, the 7-pin connects with the TXC+ end, the 8-pin connects with the TXC- end, the 12-pin connects with the TX_SDA end, the 13-pin connects with the TX_SCL end; The 9-pin, the 10-pin and the 14-pin of the chip J3 connect with the ground; The 15-pin of the chip J3 connects with the capacitor C113 and the TX5V end, the capacitor C113 connects with the ground; The 16-pin of the chip J3 connects with the resistor R103 and the TX_HPD end, the resistor R103 connects with the ground.

7. The multimedia audio / video signal switcher of claim 1, wherein: The serial port communication unit comprises a chip IC4 and a chip IC5, wherein: The 1-pin of the chip IC4 connects with the capacitor C71, the 3-pin of the chip IC4 connects with the other end of the capacitor C71; The 2-pin of the chip IC4 connects with the capacitor C66, the 16-pin of the chip IC4 connects with the capacitor C65, the other end of the capacitor C66 and the +5V end, the capacitor C65 connects with the ground; The 4-pin of the chip IC4 connects with the capacitor C72, the 5-pin of the chip IC4 connects with the other end of the capacitor C72; The 6-pin of the chip IC4 connects with the capacitor C69, and the capacitor C69 connects with the ground; The 7-pin of the chip IC4 connects with the TXD2 end, the 8-pin connects with the RXD2 end, the 9-pin connects with the RX2 end, the 10-pin connects with the TX2 end, the 11-pin connects with the TIN_1 end, the 12-pin connects with the RX1 end, the 13-pin connects with the RXD1 end, the 14-pin connects with the TOUT_1 end, and the 15-pin connects with the ground; The 1-pin of the chip IC5 connects with the capacitor C75, and the 3-pin of the chip IC5 connects with the other end of the capacitor C75; The 2-pin of the chip IC5 connects with the capacitor C68, the 16-pin of the chip IC5 connects with the other end of the capacitor C68 and the +5V end, and the capacitor C67 connects with the ground; The 4-pin of the chip IC5 connects with the capacitor C75, and the 5-pin of the chip IC5 connects with the other end of the capacitor C74; The 6-pin of the chip IC5 connects with the capacitor C70, and the capacitor C70 connects with the ground; The 7-pin of the chip IC5 connects with the TOUT_4 end, the 10-pin connects with the TIN_4 end, the 11-pin connects with the TIN_2 end, and the 15-pin connects with the ground.

Images