Video signal conversion device

Abstract

The utility model relates to a video signal conversion device, and relates to the field of video signal processing. The video signal conversion device comprises a signal input connector and a conversion chip, wherein a first diode is connected between the signal input end of the conversion chip and the signal input connector; and a second diode is also connected between the first signal output end of the conversion chip and the VGA connector. The video signal conversion device provided by the technical scheme can convert a video signal in which a line-field synchronization signal is mixed in an RGB signal into a standard VGA video signal, is especially suitable for a complex situation in which the line-field synchronization signal is mixed in the RGB signal, has overvoltage and direct current blocking protection functions, can effectively guarantee the safety of equipment, is strong in anti-interference capability, and is suitable for popularization and application. The device can stably work in a complex electromagnetic environment, is long in transmission distance, meets the long-distance transmission requirement, and greatly expands the application range and use scenes of video signals.

Description

TECHNICAL FIELD

[0001] The utility model relates to video signal processing technical field, especially a kind of video signal conversion device. BACKGROUND

[0002] In modern meteorological monitoring field, weather radar plays a vital role. Weather radar processing unit extension as key components, undertake the task of processing and converting the video signal collected by radar into standard VGA video signal for observation and analysis. With the continuous development of meteorological monitoring technology, the requirement of weather radar video signal processing is also increasing.

[0003] At present, the existing technology has obvious limitations in video signal conversion. Under the existing technical system, only the RGB differential signal of separate line field synchronization signal can be processed, and the conversion mode is to convert RGB differential signal and line field signal into single-ended signal by chip and then output.

[0004] However, in the actual meteorological monitoring scene, complex video signal situation of line field synchronization signal mixed in RGB signal appears. The existing technology is helpless in the face of such mixed signal, and cannot successfully convert it into standard VGA video signal. This leads to that a large amount of video data in the form of mixed signal cannot be effectively utilized in meteorological data processing, greatly affecting the accuracy and comprehensiveness of meteorological monitoring, and limiting the further development and application of meteorological monitoring technology. SUMMARY

[0005] The utility model aims at providing a kind of video signal conversion device to solve the problems existing in the prior art.

[0006] To achieve the above purpose, the technical scheme adopted by the utility model is:

[0007] A kind of video signal conversion device, comprising:

[0008] signal input connector, which is connected with weather radar processing unit extension, for receiving the RGB composite signal generated by the weather radar processing unit extension, the RGB composite signal includes RGB differential signal and line field differential signal;And

[0009] conversion chip, its signal input end is connected with the signal input connector, for inputting the RGB composite signal;Its first signal output end is connected with VGA connector, the VGA connector is connected with the video input interface of display, for converting the RGB differential signal into RGB single-ended signal and then outputting to the display;Its second signal output end is connected to the VGA connector after driving chip, for converting the line field differential signal into line field single-ended signal and then outputting to the display.

[0010] In a possible implementation, the video signal conversion device further comprises:

[0011] A power module is connected with an external +5V power supply through the signal input connector, for supplying +5V power to the conversion chip and +5V power to the driving chip.

[0012] In a possible implementation, a first diode is further connected between the signal input end of the conversion chip and the signal input connector.

[0013] In a possible implementation, a second diode is further connected between the first signal output end of the conversion chip and the VGA connector.

[0014] In a possible implementation, the conversion chip is of AD8145YCPZ-RL type.

[0015] In a possible implementation, the driving chip is of SN74LVC8T245 type.

[0016] In a possible implementation, the power module is of NMH0505SC type.

[0017] In a possible implementation, the signal input connector is of J18A-15PM type.

[0018] In a possible implementation, the first diode is of DA204K type.

[0019] In a possible implementation, the second diode is of DA204K type.

[0020] The technical scheme provided by the utility model has at least the following beneficial effects:

[0021] The video signal conversion device provided by the technical scheme can convert the video signal with the line field synchronization signal mixed in the RGB signal into a standard VGA video signal, is particularly suitable for the complex situation that the line field signal is mixed in the RGB signal, has the overvoltage and direct current isolation protection functions, can effectively guarantee the safety of equipment, has strong anti-interference capability, can stably work in a complex electromagnetic environment, has a long transmission distance, satisfies the long distance transmission requirement, greatly expands the application range and use scene of the video signal. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings are used to provide a further understanding of the utility model, and constitute a part of the specification, are used together with the embodiments of the utility model to explain the utility model, and do not constitute the limitation on the utility model.

[0023] Figure 1The structural schematic diagram of a video signal conversion device provided by an exemplary embodiment of the present application is shown.

[0024] In the drawings:

[0025] 1, video signal conversion device; 2, weather radar processing unit extension; 3, display; 4, +5V power supply;

[0026] 11, signal input connector; 12, conversion chip; 13, drive chip; 14, VGA connector; 15, power module; 16, first diode; 17, second diode. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0028] Wherein, same parts are indicated by same reference numerals. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings of the present application specification, and the words "bottom surface" and "top surface", "inner" and "outer" refer to the directions towards or away from a specific part. In addition, the terms "first" and "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include one or more features. In the description of the present application specification, the meaning of "multiple" is two or more.

[0029] The present application will be further described below with reference to the drawings and embodiments.

[0030] Figure 1The utility model discloses a structure schematic drawing of video signal conversion device provided by one exemplary embodiment, and the video signal conversion device 1 includes: signal input connector 11 and conversion chip 12, signal input connector 11 is connected with weather radar processing unit extension 2, for receiving the RGB composite signal that weather radar processing unit extension 2 generates, and the RGB composite signal includes RGB differential signal and line field differential signal. The signal input end of conversion chip 12 is connected with signal input connector 11, for inputting RGB composite signal, the first signal output end of conversion chip 12 is connected with VGA connector 14, and VGA connector 14 is connected with the video input interface of display 3, for converting RGB differential signal into RGB single-ended signal and then outputting to display 3, the second signal output end of conversion chip 12 is connected to VGA connector 14 through drive chip 13, for converting line field differential signal into line field single-ended signal and then outputting to display 3.

[0031] In addition, the video signal conversion device 1 further includes: power module 15, which is connected with external +5V power supply 4 through signal input connector 11, for supplying ±5V electricity to conversion chip 12 and +5V electricity to drive chip 13.

[0032] It is worth mentioning that the first diode 16 is further connected between the signal input end of conversion chip 12 and signal input connector 11. The second diode 17 is further connected between the first signal output end of conversion chip 12 and VGA connector 14.

[0033] In one example, the model of conversion chip 12 is AD8145YCPZ-RL. The model of drive chip 13 is SN74LVC8T245. The model of power module 15 is NMH0505SC. The model of signal input connector 11 is J18A-15PM. The model of the first diode 16 and the second diode 17 is DA204K.

[0034] Next, the working principle of the video signal conversion device involved in the utility model embodiment is described.

[0035] In the video signal conversion device of the utility model, each component cooperates to realize the function of converting the RGB composite signal generated by the weather radar processing unit extension into a standard VGA signal and transmitting it to the display:

[0036] Signal input connector 11 (model J18A-15PM) plays a vital role in connecting and receiving signals, which is connected to the meteorological radar processing unit extension 2 by pin connection, not only receives RGB composite signals containing RGB differential signals and row field differential signals, but also introduces power into the device by connecting with external +5V power supply 4, providing power basis for subsequent work, and its solid shell can effectively resist electromagnetic interference and physical damage, ensuring the safety of signal and power transmission.

[0037] Conversion chip 12 (model AD8145YCPZ-RL) as the core component, receives RGB composite signals from signal input connector 11, converts RGB differential signals into RGB single-ended signals, and outputs them to VGA connector 14 through the first signal output end, providing image color signals for display 3; at the same time, it converts row field differential signals into row field single-ended signals, which are output through the second signal output end. This series of complex signal conversion work depends on the ±5V power provided by power module 15.

[0038] VGA connector 14 is the key node connecting the video signal conversion device and display 3, which receives RGB single-ended signals output by conversion chip 12 and row field single-ended signals processed by driving chip 13, so that the display can receive and analyze these signals and finally present clear and stable images.

[0039] The responsibility of driving chip 13 (model SN74LVC8T245) is to enhance the driving ability of row field single-ended signals output by conversion chip 12. After receiving row field single-ended signals from the second signal output end of conversion chip 12, it uses its eight bus transceiver function to amplify and shape the signals, avoiding signal distortion when transmitting to VGA connector 14, and ensuring that the display receives accurate row field synchronization signals. Its normal work cannot be separated from the +5V power provided by power module 15.

[0040] Power module 15 (model NMH0505SC) is connected to external +5V power supply 4 through signal input connector 11, introduces and converts power, provides ±5V power for conversion chip 12 and +5V power for driving chip 13, and stable power supply is the guarantee for the normal operation of the whole device.

[0041] First diode 16 and second diode 17 (model DA204K) are connected between the signal input end of conversion chip 12 and signal input connector 11, and between the first signal output end of conversion chip 12 and VGA connector 14, respectively. They have overvoltage protection function, which quickly conducts bypass high voltage when abnormal overvoltage occurs to prevent conversion chip 12 from being damaged; they also have direct current protection function, which prevents direct current components from entering conversion chip 12 and VGA connector 14, avoids direct current signal interference with video signal, and improves the anti-interference ability and reliability of the device.

[0042] In summary, the video signal conversion device provided by the technical scheme can convert the video signal with the line field synchronization signal mixed in the RGB signal into a standard VGA video signal, is particularly suitable for complex situations with the line field signal mixed in the RGB signal, has overvoltage and direct current isolation protection functions, can effectively guarantee the safety of equipment, has strong anti-interference ability, can work stably in a complex electromagnetic environment, has a long transmission distance, meets long distance transmission requirements, and greatly expands the application range and use scenarios of the video signal.

[0043] In the embodiments disclosed in the present application, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, detachable connection or integral connection; "connection" can be direct connection or indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the embodiments disclosed in the present application can be understood according to the specific circumstances.

[0044] The above is only the preferred embodiment of the present application, and it should be pointed out that for those skilled in the art, without departing from the principle of the present application, some improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A video signal converting apparatus characterized by comprising: The video signal conversion device (1) comprises: a signal input connector (11) connected with the weather radar processing unit extension (2) and used for receiving an RGB composite signal generated by the weather radar processing unit extension (2), wherein the RGB composite signal comprises an RGB differential signal and a line field differential signal; and a conversion chip (12) connected with the signal input connector (11) at a signal input end and used for inputting the RGB composite signal, connected with a VGA connector (14) at a first signal output end, wherein the VGA connector (14) is connected with a video input interface of a display (3), and used for converting the RGB differential signal into an RGB single-end signal and then outputting the RGB single-end signal to the display (3), and connected with the VGA connector (14) through a driving chip (13) at a second signal output end, and used for converting the line field differential signal into a line field single-end signal and then outputting the line field single-end signal to the display (3). The signal input end of the conversion chip (12) is further connected with a first diode (16) between the signal input connector (11), and the first signal output end of the conversion chip (12) is further connected with a second diode (17) between the VGA connector (14).

2. The video signal conversion apparatus according to claim 1, wherein The video signal conversion device (1) further comprises a power module (15) connected with an external +5V power supply (4) through the signal input connector (11) and used for supplying ±5V power to the conversion chip (12) and +5V power to the driving chip (13).

3. The video signal conversion apparatus according to claim 1, wherein The conversion chip (12) is of a model AD8145YCPZ-RL.

4. The video signal conversion apparatus according to claim 1, wherein The driving chip (13) is of a model SN74LVC8T245.

5. The video signal conversion apparatus according to claim 2, wherein The power module (15) is of a model NMH0505SC.

6. The video signal conversion apparatus according to claim 1, wherein The signal input connector (11) is of a model J18A-15PM.

7. The video signal conversion apparatus according to claim 1, wherein The first diode (16) is of a model DA204K.

8. The video signal conversion apparatus according to claim 1, wherein The second diode (17) is of a model DA204K.

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