HDMI switching control circuit and HDMI switcher

Abstract

The utility model relates to the technical field of switchers, in particular to an HDMI (High Definition Multimedia Interface) switching control circuit and an HDMI switcher. Comprising a multi-path HDMI input module and an HDMI switching module, the HDMI input module comprises an HDMI input interface, a CEC pin, an HPD pin, an I2C communication pin and a differential signal transmission channel of the HDMI input interface are correspondingly connected to a CEC pin, an HPD pin, an I2C communication pin and a differential signal transmission channel of the HDMI switching module respectively, and an HDMI output end of the HDMI switching module comprises the CEC pin. The CEC pin of the HDMI output end of the HDMI switching module is connected with the CEC pin of the HDMI input end of an external television; according to the scheme, the HDMI switching control circuit with multi-path signal input is designed, CEC communication with an external television can be carried out through the CEC link so as to realize HDMI signal transmission channel switching, a user can control switching between the external television and the HDMI switching control circuit only through a remote controller of the television, the switching action is effectively simplified, and the user experience is improved. And the device is not limited by installation environment and space requirements.

Description

Technical Field

[0001] This utility model relates to the field of switcher technology, and in particular to an HDMI switching control circuit and an HDMI switcher. Background Technology

[0002] An HDMI switcher transmits one or more HDMI signals to one or more display devices. It features multiple input ports and often requires human-computer interaction to select the signal channel. Currently, channel switching on HDMI switchers on the market is achieved only through one or more buttons on the machine and a matching remote control. Since the buttons are fixed in a certain place on the machine, they may be inaccessible when the machine is placed in a hidden location or in a small space. Furthermore, if the infrared signal is interfered with or blocked, the remote control will fail to operate. If an additional infrared extension cable is brought out, the cost of the machine will increase.

[0003] Therefore, designing an HDMI switching control circuit and HDMI switcher that is not limited by installation space or environmental interference is of great importance to those skilled in the art. Utility Model Content

[0004] This utility model provides an HDMI switching control circuit and HDMI switcher that are not limited by installation space or environmental interference, in order to solve the problems in the prior art where buttons cannot be touched due to the hidden location or limited space of the machine, and where remote control operation is unsuccessful due to infrared signal interference or shielding.

[0005] This utility model discloses an HDMI switching control circuit, which includes: a multi-channel HDMI input module and an HDMI switching module. The HDMI switching module includes multiple HDMI input terminals and one HDMI output terminal. The multiple HDMI input terminals of the HDMI switching module are respectively connected to the multiple HDMI input modules. The HDMI input module includes an HDMI input interface. The CEC pin, HPD pin, I2C communication pin, and differential signal transmission channel of the HDMI input interface are respectively connected to the CEC pin, HPD pin, I2C communication pin, and differential signal transmission channel of the HDMI switching module. The HDMI output terminal of the HDMI switching module is connected to the HDMI input terminal of an external television. The HDMI output terminal of the HDMI switching module includes a CEC pin, and the CEC pin of the HDMI output terminal of the HDMI switching module is connected to the CEC pin of the HDMI input terminal of the external television to obtain the physical addresses of the multiple HDMI input modules through the CEC protocol and switch the effective signal source.

[0006] Optionally, each differential signal transmission channel of the HDMI input interface is equipped with an anti-static module.

[0007] Optionally, a pull-up resistor is provided on the CEC pin of the HDMI input interface.

[0008] Optionally, a protection diode is also provided on the CEC pin of the HDMI input interface. The negative terminal of the protection diode is connected to the pull-up resistor, and the positive terminal of the protection diode is connected to an external power supply.

[0009] Optionally, the HDMI input module further includes a voltage regulation unit, which is connected to the HPD pin of the HDMI input interface.

[0010] To address the problems existing in the prior art, this utility model also provides an HDMI switching control circuit, which includes: a multi-channel HDMI input module, an HDMI switching module, and a microcontroller. The HDMI switching module includes multiple HDMI input terminals and one HDMI output terminal. The multiple HDMI input terminals of the HDMI switching module are respectively connected to the multiple HDMI input modules. The HDMI output terminal of the HDMI switching module is connected to the HDMI input terminal of an external television. The I2C communication pin of the microcontroller is connected to the I2C communication pin of the HDMI switching module for HDMI switching control. The reset pin of the microcontroller is connected to the reset pin of the HDMI switching module for resetting the HDMI switching module.

[0011] Optionally, the HDMI output terminal of the HDMI switching module includes a CEC pin. Both the CEC pin of the HDMI output terminal of the HDMI switching module and the CEC pin of the microcontroller are connected to the CEC pin of the HDMI input terminal of the external TV to perform switching control through CEC protocol communication.

[0012] Optionally, it also includes a button, wherein the microcontroller is equipped with a button control pin, and the button control pin is connected to the button.

[0013] Optionally, the HDMI switching control circuit includes two HDMI input modules. The HDMI switching module is an HDMI repeater with two HDMI input terminals, and the two HDMI input terminals of the HDMI repeater are respectively connected to the two HDMI input modules.

[0014] To address the problems existing in the prior art, this utility model also provides a switcher, wherein the switcher includes a circuit board and a housing, the circuit board is disposed inside the housing, and the aforementioned HDMI switching control circuit is arranged on the circuit board.

[0015] Compared with the prior art, the beneficial effects of the HDMI switching control circuit provided by this utility model embodiment are as follows: By designing an HDMI switching control circuit, including a multi-channel HDMI input module and an HDMI switching module, the HDMI switching module includes multiple HDMI input terminals and one HDMI output terminal. The multiple HDMI input terminals of the HDMI switching module are respectively connected to the multi-channel HDMI input module, and the HDMI output terminal of the HDMI switching module is connected to the HDMI input terminal of an external TV. The HDMI output terminal of the HDMI switching module includes a CEC pin, and the CEC pin of the HDMI output terminal of the HDMI switching module is connected to the CEC pin of the HDMI input terminal of the external TV to perform HDMI switching control through CEC protocol communication. This solution, by designing an HDMI switching control circuit, can communicate with an external TV through a CEC link to realize the switching of HDMI signal transmission channels. Users can control the switching of the external TV and the HDMI switching control circuit simply through the TV remote control, which not only effectively simplifies the switching action but is also not limited by the installation environment and space requirements. Attached Figure Description

[0016] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0017] Figure 1 This is a schematic diagram of the HDMI switching control circuit provided in this embodiment of the utility model. Figure 1 ;

[0018] Figure 2 This is a circuit diagram of the HDMI switching module provided in this embodiment of the utility model;

[0019] Figure 3 This is a circuit diagram of the HDMI input module provided in this embodiment of the utility model;

[0020] Figure 4 This is a circuit diagram of the microcontroller provided in this embodiment of the utility model;

[0021] Figure 5 This is a schematic diagram of the HDMI switching control circuit provided in this embodiment of the utility model. Figure 2 ;

[0022] Figure 6 This is a structural schematic diagram of the HDMI switcher provided in this embodiment of the utility model.

[0023] The labels for the attached figures are as follows:

[0024] 10. HDMI input module; 20. HDMI switching module; 30. External TV; U40. Microcontroller; 50. Buttons; 100. Housing; 200. Circuit board; 300. HDMI switching control circuit. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0026] like Figures 1 to 3 As shown, this utility model provides a specific embodiment of an HDMI switching control circuit.

[0027] An HDMI switching control circuit, reference Figure 1 The HDMI switching control circuit includes a multi-channel HDMI input module 10 and an HDMI switching module 20. The HDMI switching module 20 includes multiple HDMI input terminals HDMI_IN and one HDMI output terminal HDMI_OUT. The multiple HDMI input terminals HDMI_IN of the HDMI switching module 20 are respectively connected to the multi-channel HDMI input module 10. The HDMI output terminal HDMI_OUT of the HDMI switching module 20 is connected to the HDMI input terminal HDMI_IN of the external television 30. The HDMI output terminal HDMI_OUT of the HDMI switching module 20 includes a CEC pin. The CEC pin of the HDMI output terminal HDMI_OUT of the HDMI switching module 20 is connected to the CEC pin of the external television 30 to perform HDMI switching control through CEC protocol communication.

[0028] Specifically, the HDMI switching control circuit includes two HDMI input modules 10, which are used to connect two different HDMI signal sources. The HDMI switching module 20 is configured with two HDMI input terminals HDMI_IN, which are respectively connected to the two HDMI input modules 10. The HDMI switching module 20 is configured with an HDMI output terminal HDMI_OUT for connecting to an external TV 30. The HDMI output terminal HDMI_OUT of the HDMI switching module 20 is connected to the HDMI input terminal HDMI_IN of the external TV 30 and communicates through the CEC protocol. In the CEC process, based on the tree structure of the CEC protocol, CEC commands communicate point-to-point through physical addresses. The display terminal of the external TV 30 is the root node. After reading the EDID of the display terminal of the external TV 30, the HDMI switching module 20 assigns two physical addresses to the two HDMI input modules 10 for communication.

[0029] After completing the allocation of CEC physical addresses, the HDMI switching module 20 communicates with the display end of the external TV 30 through the CEC channel. Through CEC command interaction, the display end of the external TV 30 obtains the physical address and name of each valid signal source port. When the external TV 30 obtains the information and calls its OSD menu, it can display the physical address and name of the valid signal source port, thereby controlling the switching of the HDMI signal channel.

[0030] refer to Figure 2 The HDMI switching module 20 can specifically use the GSV6702 chip. The GSV6702 chip is a high-performance, low-power 2-IN-1-OUT HDMI 2.1 repeater. The GSV6702 chip has two HDMI input terminals HDMI_IN, one of which, HDMI_INRXA, is connected to one of the HDMI input modules 10. It includes the following pins: RXA_HPD, RXA_SDA, RXA_SCL, RXA_5V, RXA_CN, RXA_CP, RXA_ON, RXA_OP, RXA_1N, RXA_1P, RXA_2N, and RXA_2P.

[0031] Another HDMI input terminal, HDMI_INRXB, is connected to another HDMI input module 10, which includes RXB_HPD pin, RXB_SDA pin, RXB_SCL pin, RXB_5V pin, RXB_CN pin, RXB_CP pin, RXB_0N pin, RXB_0P pin, RXB_1N pin, RXB_1P pin, RXB_2N pin, and RXB_2P pin. The GSV6702 chip has one output terminal for connecting to an external television 30, which includes CEC pin, TX_SDA pin, TX_SCL pin, TX_HPD pin, TX_CN pin, TX_CP pin, TX_0N pin, TX_0P pin, TX_1N pin, TX_1P pin, TX_2N pin, and TX_2P pin.

[0032] Among them, the pins are RXA_CN, RXA_CP, RXA_0N, RXA_0P, RXA_1N, RXA_1P, RXA_2N, RXA_2P, RXB_CN, RXB_CP, RXB_0N, RXB_0P, RXB_1N, RXB_1P, RXB_2N, RXB_2P, TX_CN, TX_CP, TX_0N, TX_0P, and TX_ The 1N pin, TX_1P pin, TX_2N pin, and TX_2P pin are all differential signal transmission channels. The RXB_SDA pin, RXB_SCL pin, RXA_SDA pin, RXA_SCL pin, TX_SDA pin, and TX_SCL pin are all used for I2C communication. The RXA_HPD pin, RXB_HPD pin, and TX_HPD pin are all used for insertion and removal status detection. The CEC pin is used for CEC signal transmission with the external television 30 to achieve communication and control.

[0033] When the HDMI switching control circuit is powered on, the external TV 30 will detect a high-level input. After detecting the high level, the external TV 30 will pull the level on the TX_HPD pin of the GSV6702 chip high. After detecting that its TX_HPD pin level has been pulled high, the GSV6702 chip will start reading the EDID of the external TV 30 through its TX_SDA and TX_SCL pins. After successfully obtaining the EDID of the external TV 30, it will parse the communication physical address of the external TV 30 port in the CEC tree structure.

[0034] After the GSV6702 chip obtains the CEC physical address in the current CEC communication link, it assigns a simulated physical address to each HDMI input terminal HDMI_IN based on the root node physical address for CEC communication identification. When performing CEC communication, the GSV6702 chip reports the corresponding simulated physical address to the external TV 30 as a channel identifier for subsequent channel switching. When selecting a channel based on the channel identifier, the GSV6702 chip can receive the switching command sent by the external TV 30 and match each simulated physical address through the physical address in the switching command to select the corresponding HDMI signal transmission channel.

[0035] Existing HDMI switchers switch channels using only one or more buttons and a remote control mounted on the device. Since the buttons are fixed in one place, they become unreachable when the device is placed in a hidden or confined space. Furthermore, the remote control fails to operate when the infrared signal is interfered with or blocked. In addition, extending the infrared extension cable would increase the cost of the device.

[0036] In this embodiment, an HDMI switching control circuit is designed, referring to... Figure 1 The system includes a multi-channel HDMI input module 10 and an HDMI switching module 20. The HDMI switching module 20 includes multiple HDMI input terminals (HDMI_IN) and one HDMI output terminal (HDMI_OUT). The multiple HDMI input terminals (HDMI_IN) of the HDMI switching module 20 are connected to the multi-channel HDMI input module 10, and the HDMI output terminal (HDMI_OUT) of the HDMI switching module 20 is connected to the HDMI input terminal (HDMI_IN) of the external television 30. The HDMI output terminal (HDMI_OUT) of the HDMI switching module 20 includes a CEC pin, which is connected to the CEC pin of the HDMI input terminal (HDMI_IN) of the external television 30 for HDMI switching control via CEC protocol communication. This solution enables the HDMI switching control circuit with multiple signal inputs to communicate with the external television 30 via a CEC link to achieve HDMI signal transmission channel switching. Users can control the switching between the external television 30 and the HDMI switching control circuit using only the television remote control, which not only effectively simplifies the switching action but is also not limited by the installation environment and space requirements.

[0037] In one embodiment, reference Figure 3 The HDMI input module 10 includes an HDMI input interface P1. The CEC pin, HPD pin, I2C communication pin, and differential signal transmission channel of the HDMI input interface P1 are respectively connected to the CEC pin, HPD pin, I2C communication pin, and differential signal transmission channel of the HDMI switching module 20.

[0038] Specifically, refer to Figure 3 The differential signal transmission channels of the HDMI input interface P1 include RX2+ pin, RX2- pin, RX1+ pin, RX1- pin, RX0+ pin, RX0- pin, RXC+ pin, and RXC- pin. Each differential signal transmission channel of the HDMI input interface P1 is equipped with an anti-static module. Figure 3The CEC pins of the HDMI input interface P1 (U7, U8, and U9) are equipped with pull-up resistors R24 and protection diodes D1. The negative terminal of protection diode D1 is connected to the pull-up resistor R24, and the positive terminal of protection diode D1 is connected to the external power supply for safe power-on of CEC.

[0039] The HDMI input module 10 also includes a voltage regulation unit, which is connected to the HPD pin of the HDMI input interface P1 to regulate the 5V voltage to 3.3V voltage.

[0040] like Figures 2 to 5 As shown, this utility model provides another specific embodiment of an HDMI switching control circuit.

[0041] An HDMI switching control circuit, reference Figure 5 The system includes: a multi-channel HDMI input module 10, an HDMI switching module 20, and a microcontroller U40. The HDMI switching module 20 includes multiple HDMI input terminals HDMI_IN and one HDMI output terminal HDMI_OUT. The multiple HDMI input terminals HDMI_IN of the HDMI switching module 20 are respectively connected to the multi-channel HDMI input module 10. The HDMI output terminal HDMI_OUT of the HDMI switching module 20 is connected to the HDMI input terminal HDMI_IN of an external television 30. The I2C communication pin of the microcontroller U40 is connected to the I2C communication pin of the HDMI switching module 20 for HDMI switching control. The reset pin of the microcontroller U40 is connected to the reset pin of the HDMI switching module 20 for resetting the HDMI switching module 20.

[0042] Specifically, refer to Figure 5 The HDMI switching control circuit includes two HDMI input modules 10, which are used to connect two different HDMI signal sources. The HDMI switching module 20 is configured with two HDMI input terminals HDMI_IN, which are respectively connected to the two HDMI input modules 10. The HDMI switching module 20 is configured with an HDMI output terminal HDMI_OUT for connecting to an external TV 30. The HDMI output terminal HDMI_OUT of the HDMI switching module 20 is connected to the HDMI input terminal HDMI_IN of the external TV 30 and communicates through the CEC protocol. Both the HDMI switching module 20 and the microcontroller U40 are configured with CEC pins, which are connected to the CEC pins of the HDMI input terminal HDMI_IN of the external TV 30 for CEC protocol communication.

[0043] In the CEC process, based on the tree structure of the CEC protocol, CEC commands communicate point-to-point through physical addresses. The display end of the external TV 30 is the root node. After reading the EDID of the display end of the external TV 30, the microcontroller U40 sends it to the HDMI switching module 20. The HDMI switching module 20 assigns two physical addresses to the two HDMI input modules 10 according to the EDID for communication.

[0044] After the CEC physical address allocation is completed, both the HDMI switching module 20 and the microcontroller U40 communicate with the display end of the external TV 30 through the CEC channel. Through CEC command interaction, the display end of the external TV 30 obtains the physical address and name of each valid signal source port. When the external TV 30 obtains the information and calls its OSD menu, it can display the physical address and name of the valid signal source port, thereby controlling the switching of the HDMI signal channel.

[0045] refer to Figure 2 The HDMI switching module 20 can specifically use the GSV6702 chip. The GSV6702 chip is a high-performance, low-power 2-in-1-out HDMI 2.1 repeater. (See reference...) Figure 2 The GSV6702 chip has two HDMI input terminals, HDMI_IN. One of the HDMI input terminals, HDMI_INRXA, is connected to one of the HDMI input modules 10. It includes the following pins: RXA_HPD, RXA_SDA, RXA_SCL, RXA_5V, RXA_CN, RXA_CP, RXA_ON, RXA_OP, RXA_1N, RXA_1P, RXA_2N, and RXA_2P.

[0046] Another HDMI input terminal, HDMI_INRXB, is connected to another HDMI input module 10. It includes RXB_HPD pin, RXB_SDA pin, RXB_SCL pin, RXB_5V pin, RXB_CN pin, RXB_CP pin, RXB_0N pin, RXB_0P pin, RXB_1N pin, RXB_1P pin, RXB_2N pin, and RXB_2P pin. The GSV6702 chip has one output terminal for connecting to an external television 30. It includes CEC pin, TX_SDA pin, TX_SCL pin, TX_HPD pin, TX_CN pin, TX_CP pin, TX_0N pin, TX_0P pin, TX_1N pin, TX_1P pin, TX_2N pin, and TX_2P pin.

[0047] Among them, the pins are RXA_CN, RXA_CP, RXA_0N, RXA_0P, RXA_1N, RXA_1P, RXA_2N, RXA_2P, RXB_CN, RXB_CP, RXB_0N, RXB_0P, RXB_1N, RXB_1P, RXB_2N, RXB_2P, TX_CN, TX_CP, TX_0N, TX_0P, and TX_ The 1N pin, TX_1P pin, TX_2N pin, and TX_2P pin are all differential signal transmission channels. The RXB_SDA pin, RXB_SCL pin, RXA_SDA pin, RXA_SCL pin, TX_SDA pin, and TX_SCL pin are all used for I2C communication. The RXA_HPD pin, RXB_HPD pin, and TX_HPD pin are all used for insertion and removal status detection. The CEC pin is used for CEC signal transmission with the external television 30 to achieve communication and control.

[0048] Furthermore, the GSV6702 chip also includes a GSV_RST pin for connection to the reset pin of the microcontroller U40 for resetting the GSV6702 chip. The GSV6702 chip also includes an MCU_I2C_SCL pin and an MCU_I2C_SDA pin for communication with the microcontroller U40 via I2C.

[0049] When the HDMI switching control circuit is powered on, the external TV 30 will detect a high-level input. After detecting the high level, the external TV 30 will pull the level on the TX_HPD pin of the GSV6702 chip high. After detecting that its TX_HPD pin level has been pulled high, the GSV6702 chip will start reading the EDID of the external TV 30 through its TX_SDA and TX_SCL pins. After successfully obtaining the EDID of the external TV 30, it will parse the communication physical address of the external TV 30 port in the CEC tree structure.

[0050] After the GSV6702 chip obtains the CEC physical address in the current CEC communication link, it assigns a simulated physical address to each HDMI input terminal HDMI_IN based on the root node physical address for CEC communication identification. When CEC communication is performed, the GSV6702 chip transmits the corresponding simulated physical address to the microcontroller U40 and reports it to the external TV 30 through the TX_CEC pin of the microcontroller U40 as a channel identifier for subsequent channel switching. When channel selection is performed based on the channel identifier, the microcontroller U40 can receive the switching command sent by the external TV 30 and control the GSV6702 chip to match the physical address in the switching command to each simulated physical address, thereby selecting the corresponding HDMI signal transmission channel.

[0051] In one embodiment, reference Figure 3 The HDMI input module 10 includes an HDMI input interface P1. The CEC pin, HPD pin, I2C communication pin, and differential signal transmission channel of the HDMI input interface P1 are respectively connected to the CEC pin, HPD pin, I2C communication pin, and differential signal transmission channel of the HDMI switching module 20.

[0052] Specifically, refer to Figure 3 Each differential signal transmission channel of the HDMI input interface P1 is equipped with an anti-static module. Figure 3 The CEC pins of the HDMI input interface P1 (U7, U8, and U9) are equipped with pull-up resistors R24 and protection diodes D1. The negative terminal of protection diode D1 is connected to the pull-up resistor R24, and the positive terminal of protection diode D1 is connected to the external power supply for safe power-on of CEC.

[0053] The HDMI input module 10 also includes a voltage regulation unit, which is connected to the HPD pin of the HDMI input interface P1 to regulate the 5V voltage to 3.3V voltage.

[0054] In one embodiment, reference Figure 5 The HDMI switching control circuit also includes a button 50. The microcontroller U40 is equipped with a button control pin KEY_1, which is connected to the button 50. The button 50 can change the level signal of the button control pin KEY_1 of the microcontroller U40, thereby controlling the HDMI switching module 20 to switch the HDMI signal transmission channel.

[0055] like Figure 6 As shown, this utility model also provides a specific embodiment of a switcher.

[0056] A switcher, reference Figure 6The switcher includes a housing 100 and a circuit board 200. The housing 100 is disposed inside the circuit board 200, and the aforementioned HDMI switching control circuit 300 is arranged on the circuit board 200.

[0057] It should be understood that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of this utility model.

Claims

1. An HDMI switching control circuit, characterized in that, include: The system includes a multi-channel HDMI input module and an HDMI switching module. The HDMI switching module comprises multiple HDMI input terminals and one HDMI output terminal. The multiple HDMI input terminals of the HDMI switching module are respectively connected to the multiple HDMI input modules. Each HDMI input module includes an HDMI input interface. The CEC pin, HPD pin, I2C communication pin, and differential signal transmission channel of the HDMI input interface are respectively connected to the CEC pin, HPD pin, I2C communication pin, and differential signal transmission channel of the HDMI switching module. The HDMI output terminal of the HDMI switching module is connected to the HDMI input terminal of an external television. The HDMI output terminal of the HDMI switching module includes a CEC pin, which is connected to the CEC pin of the HDMI input terminal of the external television to obtain the physical addresses of the multiple HDMI input modules through the CEC protocol and switch the signal source according to the multiple physical addresses.

2. The HDMI switching control circuit according to claim 1, characterized in that, Each differential signal transmission channel of the HDMI input interface is equipped with an anti-static module.

3. The HDMI switching control circuit according to claim 1, characterized in that, The CEC pin of the HDMI input interface is equipped with a pull-up resistor.

4. The HDMI switching control circuit according to claim 3, characterized in that, The CEC pin of the HDMI input interface is also equipped with a protection diode. The negative terminal of the protection diode is connected to the pull-up resistor, and the positive terminal of the protection diode is connected to the external power supply.

5. The HDMI switching control circuit according to claim 1, characterized in that, The HDMI input module also includes a voltage regulation unit, which is connected to the HPD pin of the HDMI input interface.

6. The HDMI switching control circuit according to any one of claims 1-5, characterized in that: The HDMI switching control circuit includes two HDMI input modules. The HDMI switching module is an HDMI repeater with two HDMI input terminals, and the two HDMI input terminals of the HDMI repeater are respectively connected to the two HDMI input modules.

7. An HDMI switching control circuit, characterized in that, include: The system includes a multi-channel HDMI input module, an HDMI switching module, and a microcontroller. The HDMI switching module comprises multiple HDMI input terminals and one HDMI output terminal. The multiple HDMI input terminals of the HDMI switching module are respectively connected to multiple HDMI input terminals. The HDMI output terminal of the HDMI switching module is connected to the HDMI input terminal of an external television. The I2C communication pin of the microcontroller is connected to the I2C communication pin of the HDMI switching module for HDMI switching control. The reset pin of the microcontroller is connected to the reset pin of the HDMI switching module for resetting the HDMI switching module.

8. The HDMI switching control circuit according to claim 7, characterized in that, The HDMI output terminal of the HDMI switching module includes a CEC pin. Both the CEC pin of the HDMI output terminal of the HDMI switching module and the CEC pin of the microcontroller are connected to the CEC pin of the HDMI input terminal of the external TV to perform switching control through CEC protocol communication.

9. The HDMI switching control circuit according to claim 7, characterized in that, It also includes buttons, and the microcontroller is equipped with button control pins, which are connected to the buttons.

10. A switcher, characterized in that, The switcher includes a circuit board and a housing, the circuit board being disposed within the housing, and the circuit board being provided with an HDMI switching control circuit as described in any one of claims 1-6 or any one of claims 7-9.

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