SDI to HDMI video signal conversion circuit and device

Abstract

The utility model discloses an SD-to-HDM-I video signal conversion circuit and device. The circuit comprises a main processing module, a power management module, an SD-to-HDM-I video input interface module, an SD-to-HDM-I video processing module, an SD-to-HDM-I signal control module, an HDM-I video output interface module and a USB interface module. The SD video input interface module is electrically connected with the SD video processing module, the SD video processing module is electrically connected with the main processing module, the main processing module is electrically connected with the SD-to-HDM-I signal control module, the SD-to-HDM-I signal control module is electrically connected with the SD video processing module and the HDM-I video output interface module respectively, and the HDM-I video output interface module is electrically connected with the USB interface module. And the USB interface module is electrically connected with the main processing module and the upper computer respectively. According to the utility model, 4K video signal conversion control from SD I to HDM I can be realized, reverse connection prevention and power supply overvoltage protection functions are realized, and the reliability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of video, and in particular to a SDI to HDMI video signal conversion circuit and device. Background Art

[0002] With the continuous development of video technology, video interface signal conversion technology has also been continuously developed. Among them, long-distance video signal transmission mostly adopts SDI line for transmission. 4K video signal interface conversion device adopts some new technologies, such as SDI, ultra-high frequency analog signal and digital transmission. SDI transmission can effectively avoid signal loss and interference, so it has become an important technology for video signal interface conversion device. Ultra-high frequency analog signal technology increases bandwidth and can transmit higher resolution signals. Digital transmission technology can digitize signals to achieve more accurate signal transmission. 4K technology is increasingly favored by users and will become the mainstream of high-definition video in the future. Therefore, the application prospect of 4K video signal interface conversion device is very broad. At present, 4K video signal interface conversion device has been widely used in home theater, digital advertising, digital education, sports stadiums, medical industry and other fields. In the future, with the continuous popularization of high-definition video and the continuous expansion of application fields, 4K video signal interface conversion device will also get greater development space.

[0003] In the prior art, 4K video signal interface conversion devices have the following disadvantages: 1) high power consumption, high cost, and severe heating during operation; 2) no protection against reverse connection and overvoltage, resulting in chip burnout; 3) incomplete resolution support, long SDI input line and short support distance. Therefore, inventing a new and reliable 4K video signal interface conversion device is an urgent problem to be solved by technicians in this field. Utility Model Content

[0004] The purpose of this application is to provide an SDI to HDMI video signal conversion circuit and device. In this solution, it is possible to realize SDI to HDMI 4K video signal conversion control, realize anti-reverse connection and power supply overvoltage protection functions, and have high reliability.

[0005] In order to solve the above technical problems, the present application provides an SDI to HDMI video signal conversion circuit, including a main processing module, a power management module, an SDI video input interface module, an SDI video processing module, an SDI to HDMI signal control module, an HDMI video output interface module and a USB interface module;

[0006] The power management module is electrically connected to the SDI video input interface module, the SDI video processing module, the SDI to HDMI signal control module, the HDMI video output interface module and the USB interface module respectively;

[0007] The SDI video input interface module is electrically connected to the SDI video processing module, the SDI video processing module is electrically connected to the main processing module, the main processing module is electrically connected to the SDI to HDMI signal control module, and the SDI to HDMI signal control module is electrically connected to the SDI video processing module and the HDMI video output interface module respectively;

[0008] The USB interface module is electrically connected to the main processing module and the host computer respectively.

[0009] Preferably, the power management module includes an anti-reverse connection unit, an overvoltage protection unit and a power supply management unit;

[0010] The anti-reverse connection unit is electrically connected to the input power supply and the overvoltage protection unit respectively, the overvoltage protection unit is electrically connected to the power supply management unit, and the power supply management unit is electrically connected to the SDI video input interface module, the SDI video processing module, the SDI to HDMI signal control module, the HDMI video output interface module and the USB interface module respectively.

[0011] Preferably, the SDI to HDMI signal control module includes a control unit and an HDMI signal conversion unit;

[0012] The control unit is electrically connected to the power management module, the SDI video processing module, the main processing module and the HDMI signal conversion unit respectively, and the HDMI signal conversion unit is electrically connected to the power management module, the main processing module and the HDMI video output interface module respectively.

[0013] Preferably, the SDI video processing module includes an SDI input processing unit, an SDI bidirectional IO transmission unit and an SDI follow output unit;

[0014] The SDI input processing unit is electrically connected to the SDI video input interface module, the SDI bidirectional IO transmission unit is electrically connected to the power management module, the SDI input processing unit and the SDI follow output unit respectively, and the SDI follow output unit is electrically connected to the main processing module and the SDI to HDMI signal control module respectively.

[0015] Preferably, the HDMI video output interface module includes an HDMI interface unit, an anti-interference unit and an electrostatic suppression unit;

[0016] The anti-interference unit is electrically connected to the HDMI signal conversion unit and the electrostatic suppression unit respectively, and the electrostatic suppression unit is electrically connected to the HDMI interface unit.

[0017] Preferably, the anti-reverse connection unit includes a first MOS tube, a first resistor, a first capacitor and a second capacitor;

[0018] The source of the first MOS tube is electrically connected to the first end of the first capacitor and the input power supply respectively, the gate of the first MOS tube is electrically connected to the first end of the first resistor, the drain of the first MOS tube is electrically connected to the first end of the second capacitor and the overvoltage protection unit respectively, the second end of the first resistor is grounded, and the second end of the second capacitor is grounded.

[0019] Preferably, the overvoltage protection unit includes an overvoltage protector and an output filter unit;

[0020] The overvoltage protector is electrically connected to the anti-reverse connection unit and the output filter unit respectively.

[0021] Preferably, the main processing module is configured as a FPGA processor.

[0022] Preferably, the control unit is configured as an MCU controller.

[0023] In order to solve the above technical problems, the present application provides an SDI to HDMI video interface signal conversion device, including the above-mentioned SDI to HDMI video signal conversion circuit.

[0024] The utility model has the following beneficial effects: the utility model discloses an SDI to HDMI video signal conversion circuit, including a main processing module, a power management module, an SDI video input interface module, an SDI video processing module, an SDI to HDMI signal control module, an HDMI video output interface module and a USB interface module; the SDI video input interface module is electrically connected to the SDI video processing module, the SDI video processing module is electrically connected to the main processing module, the main processing module is electrically connected to the SDI to HDMI signal control module, the SDI to HDMI signal control module is electrically connected to the SDI video processing module and the HDMI video output interface module respectively; the USB interface module is electrically connected to the main processing module and the host computer respectively. Therefore, the utility model can realize the 4K video signal conversion control of SDI to HDMI, and has high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0026] Figure 1 This is a structural schematic diagram of an SDI to HDMI video signal conversion circuit in a preferred embodiment of the utility model;

[0027] Figure 2 This is a structural schematic diagram of another SDI to HDMI video signal conversion circuit of a preferred embodiment of the utility model;

[0028] Figure 3 It is a circuit schematic diagram of an SDI video processing module of an SDI to HDMI video signal conversion circuit of a preferred embodiment of the utility model;

[0029] Figure 4 It is a circuit schematic diagram of an HDMI video output interface module of an SDI to HDMI video signal conversion circuit of a preferred embodiment of the utility model;

[0030] Figure 5 The utility model is a circuit schematic diagram of an anti-reverse connection unit and an overvoltage protection unit of an SDI to HDMI video signal conversion circuit according to a preferred embodiment of the utility model. DETAILED DESCRIPTION

[0031] The core of this application is to provide an SDI to HDMI video signal conversion circuit and device. In this solution, it can realize SDI to HDMI 4K video signal conversion control, realize anti-reverse connection and power supply overvoltage protection functions, and has high reliability.

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] See also Figure 1 , Figure 1 A schematic diagram of the structure of an SDI to HDMI video signal conversion circuit provided in the present application, comprising a main processing module 1, a power management module 2, an SDI video input interface module 3, an SDI video processing module 4, an SDI to HDMI signal control module 5, an HDMI video output interface module 6 and a USB interface module 7;

[0034] The power management module 2 is electrically connected to the SDI video input interface module 3, the SDI video processing module 4, the SDI to HDMI signal control module 5, the HDMI video output interface module 6 and the USB interface module 7 respectively;

[0035] The SDI video input interface module 3 is electrically connected to the SDI video processing module 4, the SDI video processing module 4 is electrically connected to the main processing module 1, the main processing module 1 is electrically connected to the SDI to HDMI signal control module 5, and the SDI to HDMI signal control module 5 is electrically connected to the SDI video processing module 4 and the HDMI video output interface module 6 respectively;

[0036] The USB interface module 7 is electrically connected to the main processing module 1 and the host computer respectively.

[0037] In the prior art, 4K video signal interface conversion devices have the following disadvantages: 1) high power consumption, high cost, and severe heat generation during operation; 2) lack of protection against reverse connection and overvoltage, which may cause the chip to burn out; 3) incomplete resolution support, and the SDI input line is long and the support distance is short.

[0038] In response to the above-mentioned shortcomings, this application realizes the 4K video signal conversion control of SDI to HDMI through the cooperation of the main processing module 1, the power management module 2, the SDI video input interface module 3, the SDI video processing module 4, the SDI to HDMI signal control module 5, the HDMI video output interface module 6 and the USB interface module 7.

[0039] Specifically, the overall power consumption of the present application is low, the SDI video input interface module 3 is 4K input, the HDMI video output interface module 6 is 4K output, and the circuit power is 3.1W during normal operation, that is, the power of the main processing module 1 is 1.5W, the power of the SDI video input interface module 3 is 0.5W, the power of the SDI to HDMI signal control module 5 is 0.3W, and the power of the HDMI video output interface module 6 is 0.8W.

[0040] Specifically, in this embodiment, the SDI video input interface module 3 is provided with an equalizer and a reclocker function, and has a LOOP output that follows the input signal.

[0041] Specifically, in this embodiment, the USB interface module 7 is connected to a host computer, and the output of the resolution of the audio and video signals is controlled by the host computer.

[0042] Specifically, the power management module 2 is used to provide rated voltage output, the SDI video input interface module 3 is used to input SDI video signals, the SDI video processing module 4 is used to realize the transmission and processing of SDI video signals, and after the main processing module 1 receives the SDI video signal, it controls the SDI to HDMI signal control module 5 to realize the conversion of SDI video signals to HDMI video signals, and the HDMI video output interface module 6 is used to transmit the converted HDMI video signal to an external HDMI video device.

[0043] In summary, the present application provides a SDI to HDMI video signal conversion circuit, in this solution, including a main processing module 1, a power management module 2, an SDI video input interface module 3, an SDI video processing module 4, an SDI to HDMI signal control module 5, an HDMI video output interface module 6 and a USB interface module 7; the SDI video input interface module 3 is electrically connected to the SDI video processing module 4, the SDI video processing module 4 is electrically connected to the main processing module 1, the main processing module 1 is electrically connected to the SDI to HDMI signal control module 5, the SDI to HDMI signal control module 5 is electrically connected to the SDI video processing module 4 and the HDMI video output interface module 6 respectively; the USB interface module 7 is electrically connected to the main processing module 1 and the host computer respectively. Therefore, the utility model can realize the high reliability of 4K video signal conversion control of SDI to HDMI.

[0044] Based on the above embodiments:

[0045] Please refer to Figure 2 , Figure 2 This is a structural schematic diagram of an SDI to HDMI video signal conversion circuit provided in this application.

[0046] As a preferred embodiment, the power management module 2 includes an anti-reverse connection unit 21, an overvoltage protection unit 22 and a power supply management unit 23;

[0047] The anti-reverse connection unit 21 is electrically connected to the input power supply and the overvoltage protection unit 22 respectively, the overvoltage protection unit 22 is electrically connected to the power supply management unit 23, and the power supply management unit 23 is electrically connected to the SDI video input interface module 3, the SDI video processing module 4, the SDI to HDMI signal control module 5, the HDMI video output interface module 6 and the USB interface module 7 respectively.

[0048] Specifically, in this embodiment, the anti-reverse connection unit 21 is used to implement anti-reverse connection protection to prevent the power supply from being burned out by reverse connection, and the overvoltage protection unit 22 is used to implement voltage monitoring of the input power supply to prevent the power supply from being burned out by excessive voltage. Therefore, the present application transmits the electric energy to the power supply management unit 23 after anti-reverse connection and overvoltage protection to ensure the reliability of the power supply input.

[0049] As a preferred embodiment, the SDI to HDMI signal control module 5 includes a control unit 51 and an HDMI signal conversion unit 52;

[0050] The control unit 51 is electrically connected to the power management module 2, the SDI video processing module 4, the main processing module 1 and the HDMI signal conversion unit 52 respectively, and the HDMI signal conversion unit 52 is electrically connected to the power management module 2, the main processing module 1 and the HDMI video output interface module 6 respectively.

[0051] As a preferred embodiment, the control unit 51 is configured as an MCU controller, and the model of the MCU controller is not specifically limited herein.

[0052] Specifically, in this embodiment, the control unit 51 is used to cooperate with the main processing module 1 to convert the SDI video signal into an LVDS video signal and transmit it to the HDMI signal conversion unit 52. The HDMI signal conversion unit 52 converts the LVDS video signal into an HDMI signal and transmits it to the HDMI video output interface module 6 for output display.

[0053] Please refer to Figure 3 , Figure 3 A circuit schematic diagram of an SDI video processing module provided in this application.

[0054] As a preferred embodiment, the SDI video processing module 4 includes an SDI input processing unit 41, an SDI bidirectional IO transmission unit 42 and an SDI follow output unit 43;

[0055] The SDI input processing unit 41 is electrically connected to the SDI video input interface module 3, the SDI bidirectional IO transmission unit 42 is electrically connected to the power management module 2, the SDI input processing unit 41 and the SDI follow output unit 43 respectively, and the SDI follow output unit 43 is electrically connected to the main processing module 1 and the SDI to HDMI signal control module 5 respectively.

[0056] Specifically, in this embodiment, the formats supported by the SDI video signal include 525 / 29.97NTSC, 525 / 23.98NTSC, and 625 / 25PAL; the formats supported by the HDMI video signal include 720p59.94, 720p60, 1080i50, 1080i59.94, 1080i60, 1080PsF23.98, 1080PsF24, 1080PsF25, 1080PsF29.97, 1080PsF30, 1080p23.98, 1080p24, 1080p25, 1080p29.97, 1080p30, 1080p50, 1080p59.94, and 1080p60.

[0057] Specifically, the present application is compatible with 2K formats, including 2048x1080PsF23.98, 2048x1080p23.98, 2048x1080PsF24, 2048x1080p24, and 2048x1080PsF2.

[0058] Specifically, the 4K formats of the present application include 3840x2160p23.98, 3840x2160p24, 3840x2160p25, 3840x2160p29.97, 3840x2160p30, 4096x2160p24, 3840x2160p60, and 4096x2160p60.

[0059] Specifically, in this embodiment, the SDI input processing unit 41 implements electrostatic protection through a TVS tube; the LOCK_N pin implements input signal locking, and transmits the locking signal to the main processing module and the MCU controller at the same time, so as to achieve rapid response during signal conversion; the SDI follow output unit 43 adopts an SDI LOOP output that follows the input, so as to facilitate confirmation of the status of the input signal and achieve precise output control.

[0060] Please refer to Figure 4 , Figure 4 A circuit schematic diagram of an HDMI video output interface module provided in this application.

[0061] As a preferred embodiment, the HDMI video output interface module 6 includes an HDMI interface unit 61, an anti-interference unit 62 and an electrostatic suppression unit 63;

[0062] The anti-interference unit 62 is electrically connected to the HDMI signal conversion unit 52 and the static electricity suppression unit 63 , respectively. The static electricity suppression unit 63 is electrically connected to the HDMI interface unit 61 .

[0063] Specifically, in this embodiment, the anti-interference unit 62 increases the common mode inductance to improve the anti-interference performance; the electrostatic suppression unit 63 uses TVSD to achieve electrostatic suppression to prevent the high voltage signal from damaging the chip.

[0064] Please refer to Figure 5 , Figure 5 A circuit schematic diagram of an anti-reverse connection unit and an overvoltage protection unit provided in this application.

[0065] As a preferred embodiment, the anti-reverse connection unit 21 includes a first MOS tube Q6, a first resistor R87, a first capacitor C1 and a second capacitor C32;

[0066] The source of the first MOS transistor Q6 is electrically connected to the first end of the first capacitor C1 and the input power supply, respectively; the gate of the first MOS transistor Q6 is electrically connected to the first end of the first resistor R87; the drain of the first MOS transistor Q6 is electrically connected to the first end of the second capacitor C32 and the overvoltage protection unit 22, respectively; the second end of the first resistor R87 is grounded; and the second end of the second capacitor C32 is grounded.

[0067] As a preferred embodiment, the overvoltage protection unit 22 includes an overvoltage protector U6 and an output filter unit;

[0068] The overvoltage protector U6 is electrically connected to the reverse connection protection unit 21 and the output filter unit respectively.

[0069] Specifically, in this embodiment, the first MOS tube is a PMOS tube, which is used to implement anti-reverse connection protection. Compared with a diode, a MOS tube anti-reverse connection circuit has the advantages of low voltage drop and small internal resistance.

[0070] Specifically, the model of the overvoltage protector U6 is set to ET9528, and the output filter unit is set to a filter capacitor. In another embodiment, the model of the overvoltage protector U6 is not specifically limited.

[0071] As a preferred embodiment, the main processing module 1 is configured as a FPGA processor. In another embodiment, the model of the main processing module 1 is not specifically limited.

[0072] The present application also provides an SDI to HDMI video interface signal conversion device, including an SDI to HDMI video signal conversion circuit.

[0073] For an introduction to an SDI to HDMI video signal conversion circuit provided in the present application, please refer to the above-mentioned embodiment, and the present application will not go into details here.

[0074] It should be noted that, in this specification, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0075] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A SDI to HDMI video signal conversion circuit, characterized in that: It includes a main processing module, a power management module, an SDI video input interface module, an SDI video processing module, an SDI to HDMI signal control module, an HDMI video output interface module and a USB interface module; The power management module is electrically connected to the SDI video input interface module, the SDI video processing module, the SDI to HDMI signal control module, the HDMI video output interface module and the USB interface module respectively; The SDI video input interface module is electrically connected to the SDI video processing module, the SDI video processing module is electrically connected to the main processing module, the main processing module is electrically connected to the SDI to HDMI signal control module, and the SDI to HDMI signal control module is electrically connected to the SDI video processing module and the HDMI video output interface module respectively; The USB interface module is electrically connected to the main processing module and the host computer respectively.

2. The SDI to HDMI video signal conversion circuit according to claim 1, characterized in that: The power management module includes an anti-reverse connection unit, an overvoltage protection unit and a power supply management unit; The anti-reverse connection unit is electrically connected to the input power supply and the overvoltage protection unit respectively, the overvoltage protection unit is electrically connected to the power supply management unit, and the power supply management unit is electrically connected to the SDI video input interface module, the SDI video processing module, the SDI to HDMI signal control module, the HDMI video output interface module and the USB interface module respectively.

3. The SDI to HDMI video signal conversion circuit according to claim 2, characterized in that: The SDI to HDMI signal control module includes a control unit and an HDMI signal conversion unit; The control unit is electrically connected to the power management module, the SDI video processing module, the main processing module and the HDMI signal conversion unit respectively, and the HDMI signal conversion unit is electrically connected to the power management module, the main processing module and the HDMI video output interface module respectively.

4. The SDI to HDMI video signal conversion circuit according to claim 1, characterized in that: The SDI video processing module includes an SDI input processing unit, an SDI bidirectional IO transmission unit and an SDI follow output unit; The SDI input processing unit is electrically connected to the SDI video input interface module, the SDI bidirectional IO transmission unit is electrically connected to the power management module, the SDI input processing unit and the SDI follow output unit respectively, and the SDI follow output unit is electrically connected to the main processing module and the SDI to HDMI signal control module respectively.

5. The SDI to HDMI video signal conversion circuit according to claim 3, characterized in that: The HDMI video output interface module includes an HDMI interface unit, an anti-interference unit and an electrostatic suppression unit; The anti-interference unit is electrically connected to the HDMI signal conversion unit and the electrostatic suppression unit respectively, and the electrostatic suppression unit is electrically connected to the HDMI interface unit.

6. The SDI to HDMI video signal conversion circuit according to claim 2, characterized in that: The anti-reverse connection unit includes a first MOS tube, a first resistor, a first capacitor and a second capacitor; The source of the first MOS tube is electrically connected to the first end of the first capacitor and the input power supply respectively, the gate of the first MOS tube is electrically connected to the first end of the first resistor, the drain of the first MOS tube is electrically connected to the first end of the second capacitor and the overvoltage protection unit respectively, the second end of the first resistor is grounded, and the second end of the second capacitor is grounded.

7. The SDI to HDMI video signal conversion circuit according to claim 6, characterized in that: The overvoltage protection unit includes an overvoltage protector and an output filter unit; The overvoltage protector is electrically connected to the anti-reverse connection unit and the output filter unit respectively.

8. The SDI to HDMI video signal conversion circuit according to claim 1, characterized in that: The main processing module is configured as an FPGA processor.

9. The SDI to HDMI video signal conversion circuit according to claim 3, characterized in that: The control unit is configured as an MCU controller.

10. A SDI to HDMI video interface signal conversion device, characterized in that: The invention comprises an SDI to HDMI video signal conversion circuit as described in any one of claims 1 to 9.

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