Control system based on HDMI transmission

Abstract

The utility model belongs to the technical field of control systems, and particularly relates to a control system based on HDMI (High Definition Multimedia Interface) transmission. The power supply circuit is connected with the main control MCU 1 to supply power, and the Ethernet communication circuit, the R232 communication circuit, the key control circuit and the infrared receiving circuit are connected with the main control MCU and used for external communication and interaction; the output end of the master control MCU is connected with a plurality of ROM storage circuits, and the master control MCU is further connected to the HDMI input processing circuit, the digital crossbar switch circuit and the HDMI output processing circuit. The HDMI input processing circuit is connected with the digital crossbar switch circuit, and the digital crossbar switch circuit is connected with the HDMI output processing circuit. The main control MCU realizes HDMI input and output channel switching by controlling the HDMI input circuit, the digital crossbar switch circuit and the HDMI output processing circuit, and can selectively output multichannel audio signals to form analog audio signals so as to meet diversified requirements.

Description

Technical Field

[0001] The utility model belongs to the technical field of control systems, and in particular relates to a control system based on HDMI transmission. Background Art

[0002] HDMI, also known as High-Definition Multimedia Interface, is the first digital interface to support the transmission of uncompressed, all-digital high-definition, multi-channel audio, and intelligently formatted and controlled data over a single cable. HDMI signals contain multi-channel audio signals and cannot output a single audio signal, which does not meet modern needs. Therefore, a control system based on HDMI transmission is provided. Utility Model Content

[0003] In order to solve the defects and shortcomings of the existing technology, the purpose of the utility model is to provide a control system based on HDMI transmission with a simple structure, reasonable design and easy use. It controls the HDMI input circuit, digital cross switch circuit and HDMI output processing circuit through the main control MCU to realize HDMI input and output channel switching, and can selectively output multi-channel audio signals to form analog audio signals to meet diverse needs.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: it includes a main control MCU, a power supply circuit, an Ethernet communication circuit, an R232 communication circuit, a key control circuit, an infrared receiving circuit, a ROM storage circuit, an HDMI input processing circuit, a digital cross switch circuit, and an HDMI output processing circuit; the power supply circuit is connected to the main control MCU1 for power supply, and the Ethernet communication circuit, the R232 communication circuit, the key control circuit, and the infrared receiving circuit are connected to the main control MCU; the output end of the main control MCU is connected to several ROM storage circuits, and the main control MCU is also connected to the HDMI input processing circuit, the digital cross switch circuit, and the HDMI output processing circuit; the HDMI input processing circuit is connected to the digital cross switch circuit, and the digital cross switch circuit is connected to the HDMI output processing circuit.

[0005] Preferably, the HDMI input processing circuit is connected to the HDMI output processing circuit via a digital cross switch circuit to form an analog audio output structure.

[0006] Preferably, the HDMI input processing circuit, the digital cross switch circuit, and the HDMI output processing circuit are controlled by a main control MCU to realize the selection and switching of input and output signals.

[0007] Preferably, the main control MCU adopts STM32F107 chip.

[0008] Preferably, the Ethernet communication circuit, R232 communication circuit, key control circuit, infrared receiving circuit and main control MCU are connected to form a multi-source control structure.

[0009] After adopting the above structure, the beneficial effect of the utility model is as follows: it controls the HDMI input circuit, digital cross switch circuit and HDMI output processing circuit through the main control MCU, realizes HDMI input and output channel switching, and can selectively output multi-channel audio signals to form analog audio signals to meet diverse needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention is described in detail through the following specific implementations and drawings.

[0011] Figure 1 This is a system structure diagram of the utility model;

[0012] Explanation of the accompanying symbols: main control MCU1, power supply circuit 2, Ethernet communication circuit 3, R232 communication circuit 4, key control circuit 5, infrared receiving circuit 6, ROM storage circuit 7, HDMI input processing circuit 8, digital cross switch circuit 9, HDMI output processing circuit 10. DETAILED DESCRIPTION

[0013] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the present invention is described below using specific embodiments illustrated in the accompanying drawings. However, it should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0014] It should also be noted here that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solution according to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0015] See Figure 1As shown, this specific embodiment adopts the following technical solution: it includes a main control MCU1, a power supply circuit 2, an Ethernet communication circuit 3, an R232 communication circuit 4, a key control circuit 5, an infrared receiving circuit 6, a ROM storage circuit 7, an HDMI input processing circuit 8, a digital cross switch circuit 9, and an HDMI output processing circuit 10; the power supply circuit 2 is connected to the main control MCU1 for power supply, and the Ethernet communication circuit 3, the R232 communication circuit 4, the key control circuit 5, and the infrared receiving circuit 6 are connected to the main control MCU1; the main control MCU is also connected to an additional external ROM storage circuit to save important data without losing it during power failure, and the main control MCU1 is also connected to the HDMI input processing circuit 8, the digital cross switch circuit 9, and the HDMI output processing circuit 10; the HDMI input processing circuit 8 is connected to the digital cross switch circuit 9, and the digital cross switch circuit 9 is connected to the HDMI output processing circuit 10.

[0016] Preferably, the HDMI input processing circuit 8 is connected to the HDMI output processing circuit 10 via a digital cross switch circuit 9 to form an analog audio output structure.

[0017] Preferably, the HDMI input processing circuit 8, the digital cross switch circuit 9, and the HDMI output processing circuit 10 are controlled by the main control MCU 1 to realize the selection and switching of input and output signals.

[0018] Preferably, the main control MCU1 adopts STM32F107 chip.

[0019] Preferably, the Ethernet communication circuit 3, R232 communication circuit 4, key control circuit 5, infrared receiving circuit 6 are connected to the main control MCU 1 to form a multi-source control structure.

[0020] The working principle of this specific embodiment is: 1. The power supply circuit 2 is DC 12V, and uses MP2307 to step down 12V to 5V and 3.3V to power each level of circuits, and uses STI3410 to step down 5V to 1V to power the HDMI output processing circuit.

[0021] 2. The main chip of the main control MCU1 is STM32F107. The main control MCU communicates with the HDMI input processing chip through IIC, which can modify the input HDMI port EDID and turn off the HDMI signal output of the HDMI input processing chip; the main control MCU communicates with the digital cross switch circuit through IIC, which can switch the input HDMI signal to different HDMI output channels; the MCU communicates with the HDMI output processing circuit through IIC to control the HDMI signal and analog audio output of the HDMI port. Only one HDMI output port is controlled by the processing chip, and the remaining HDMI ports are directly controlled by the main control MCU. The digital cross switch circuit outputs the HDMI signal to the output port, detects the HPD signal of the port, and reads the EDID information of the port; the MCU is connected to the Ethernet through the Ethernet circuit and can control the system through Ethernet after access; the MCU communicates with external control devices or other RS232-supported devices through the RS232 communication circuit; the MCU receives infrared control signals through the infrared receiving circuit and can use the infrared remote control to control the system operation; the ROM storage circuit communicates with the MCU through IIC to store the system's EDID information and other configuration information.

[0022] 3. The main chip of HDMI input processing circuit 8 is SII9187. Each HDMI input port has an HDMI processing chip SII9187 processing chip. When the HDMI signal source is connected to the HDMI input port of the system, the HDMI processing chip outputs the HPD signal and outputs the default EDID information or the EDID modified by the MCU to the HDMI signal source. The HDMI signal source reads the EDID and outputs the HDMI signal to the processing chip. The processing chip has built-in HDCP decryption and then outputs the HDMI signal to the digital cross switch circuit.

[0023] 4. The main chip of the digital cross switch circuit 9 is ADN4604, which supports 16-channel differential signal input and 16-channel differential signal output. The HDMI signal is input to the input end of ADN4604 after passing through the HDMI processing chip. The MCU communicates with ADN4604 through IIC and can switch the signal from the input end to any output end. The output signal of ADN4604 is output to the HDMI output circuit.

[0024] 5. The HDMI output processing circuit 10 uses the SII9533 processing chip and the CS4344 analog audio output chip. The SII9533 extracts and processes the audio signal from the HDMI signal, which is then processed by the CS4344 and output as analog audio. When the HDMI output port is connected to an external display, the SII9533 detects the external display's HPD signal and EDID information and outputs the HDMI information. Only some HDMI output ports are controlled by the processing chip. The HPD and EDID information of ports not controlled by the processing chip is directly read by the MCU. Ports whose HDMI signal output is directly controlled by the MCU's digital crossbar switch circuit do not have analog audio output.

[0025] 6. Ethernet communication circuit 3: The Ethernet chip is LAN8720. The MCU realizes Ethernet connection through LAN8720, so that external control devices can control the operation of the system through Ethernet.

[0026] 7. R232 communication circuit 4 The main chip is SP232. The MCU communicates with external control devices or other devices that support RS232 through RS232, receiving control instructions from external devices or sending received instructions.

[0027] 8. The main chip of the key control circuit 5 is 74HC165. The keys are scanned and read through 74HC165, and the key data is then transmitted to the MCU. The MCU responds based on the received key data.

[0028] 9. The infrared receiving circuit 6 transmits the external infrared signal to the MCU through the infrared receiving head. The MCU decodes the infrared signal and then takes corresponding actions according to the decoded content.

[0029] 10. The ROM storage circuit 7 storage chip is AT24C02, which communicates with the MCU through IIC and is used to store the MCU's configuration data or EDID information.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.

[0031] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A control system based on HDMI transmission, characterized by: It includes a main control MCU, a power supply circuit, an Ethernet communication circuit, an R232 communication circuit, a key control circuit, an infrared receiving circuit, a ROM storage circuit, an HDMI input processing circuit, a digital cross switch circuit, and an HDMI output processing circuit; the power supply circuit is connected to the main control MCU for power supply, and the Ethernet communication circuit, the R232 communication circuit, the key control circuit, and the infrared receiving circuit are connected to the main control MCU for external communication and interaction; the output end of the main control MCU is connected to several ROM storage circuits, and the main control MCU is also connected to the HDMI input processing circuit, the digital cross switch circuit, and the HDMI output processing circuit; the HDMI input processing circuit is connected to the digital cross switch circuit, and the digital cross switch circuit is connected to the HDMI output processing circuit.

2. The control system based on HDMI transmission according to claim 1, characterized in that: The HDMI input processing circuit is connected to the HDMI output processing circuit via a digital cross switch circuit to form an analog audio output structure.

3. The control system based on HDMI transmission according to claim 1, characterized in that: The HDMI input processing circuit, digital cross switch circuit, and HDMI output processing circuit are controlled by the main control MCU to realize the selection and switching of input and output signals.

4. The control system based on HDMI transmission according to claim 1, characterized in that: The main control MCU adopts STM32F107 chip.

5. The control system based on HDMI transmission according to claim 1, characterized in that: The Ethernet communication circuit, R232 communication circuit, key control circuit, infrared receiving circuit and main control MCU are connected to form a multi-source control structure.

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