Video signal conversion circuit for weather radar simulation and conversion method thereof

Abstract

This invention discloses a video signal conversion circuit and method for weather radar simulation. The conversion circuit includes a synchronization signal merging circuit, a green synchronization generation circuit, a first color signal input amplification circuit, a second color signal input amplification circuit, a first color signal differential circuit, a second color signal differential circuit, and a third color signal differential circuit. Beneficial effects: This invention uses discrete gate circuits and operational amplifier circuits, resulting in a concise and effective design with low overall cost. The discrete circuits also offer high reliability and are less prone to failure. If a fault occurs, only the relevant individual circuit needs to be replaced, rather than the entire large-scale integrated circuit, simplifying repair and reducing maintenance costs. This video signal conversion circuit effectively solves the signal conversion and matching problem between mainstream computer HDMI signals and specialized industry-specific displays.

Description

Technical Field

[0001] This invention relates to the field of video signal conversion technology, and more specifically, to a video signal conversion circuit and conversion method for weather radar simulation. Background Technology

[0002] Airborne weather radar detects weather conditions along an aircraft's flight path, including thunderstorms, hail, storms, turbulence, fog, and microstorms. This helps pilots accurately assess the weather situation and plays a crucial role in ensuring flight safety and quality, making it an indispensable component of large civil aircraft. The HDMI (High-Definition Multimedia Interface) is a new type of image display interface that supports 4K resolution (3840×2160). HDMI not only boasts a high transmission rate (up to 4.5GB / s) but also offers reliable and stable performance. HDMI can be paired with broadband digital content protection to prevent unauthorized copying of copyrighted audio-visual content.

[0003] With advancements in computing and display technologies, consumer computers now employ high-definition interfaces such as HDMI and DisplayPort for video output. However, in military, aerospace, and industrial fields, where high reliability and stability are required but high-definition display is not necessary, traditional RGsB signals are still used for video transmission. For example, weather radar displays in aviation equipment require expensive dedicated computers to drive them. In simulation and other industries where mainstream general-purpose computers are needed to drive these specialized displays, signal conversion and matching become challenging. Therefore, this invention proposes a video signal conversion circuit and method for weather radar simulation. Summary of the Invention

[0004] To address the problems in related technologies, this invention proposes a video signal conversion circuit and conversion method for weather radar simulation, in order to overcome the aforementioned technical problems existing in the prior art.

[0005] Therefore, the specific technical solution adopted by the present invention is as follows:

[0006] According to one aspect of the present invention, a video signal conversion circuit for weather radar simulation is provided. The conversion circuit includes a synchronization signal merging circuit, a green synchronization generation circuit, a first color signal input amplification circuit, a second color signal input amplification circuit, a first color signal differential circuit, a second color signal differential circuit, and a third color signal differential circuit. The input terminals of the synchronization signal merging circuit are respectively connected to the eighth and ninth pins of interface P3, and the output terminal of the synchronization signal merging circuit is connected to the green synchronization generation circuit. The input terminal of the green synchronization generation circuit is connected to the fourth pin of interface P3, and the output terminal of the green synchronization generation circuit is connected to the input terminal of the second color signal differential circuit. The outputs of the two color signal differential circuits are connected to the fourth and third pins of interface P1, respectively; the input of the first color signal input amplifier circuit is connected to the second pin of interface P3, and the output of the first color signal input amplifier circuit is connected to the input of the first color signal differential circuit. The output of the first color signal differential circuit is connected to the fifth and sixth pins of interface P1, respectively; the input of the second color signal input amplifier circuit is connected to the sixth pin of interface P3, and the output of the second color signal input amplifier circuit is connected to the input of the third color signal differential circuit. The output of the third color signal differential circuit is connected to the second and first pins of interface P1, respectively.

[0007] Furthermore, the synchronization signal merging circuit includes an OR gate, a NAND gate, and an AND gate. The first pin of the OR gate is connected to the ninth pin of the interface P3, the second pin of the OR gate is grounded, the third pin of the OR gate is connected to the fourth pin of the AND gate, the ninth pin of the NAND gate is connected to the eighth pin of the interface P3, the tenth pin of the NAND gate is grounded, and the eighth pin of the NAND gate is connected to the fifth pin of the AND gate.

[0008] Furthermore, the green synchronization generation circuit includes resistors R14, R15, R16, R17, R19, R48, R50, R51, sliding resistors RW2 and RW5, capacitors C3, C4, C13, C14, operational amplifier U3A, and operational amplifier U3B. One end of resistor R14 is connected to the fourth pin of interface P3 and one end of resistor R15, and the other end of resistor R14 is grounded. The other end of resistor R15 is connected to one end of resistor R16 and the thirteenth pin of operational amplifier U3B. The other end of resistor R16 is connected to the fourteenth pin of operational amplifier U3B and one end of resistor R17. The second pin of operational amplifier U3B is connected to one end of resistor R50, and the other end of resistor R50 is connected to the positive power supply voltage +VCC. The eleventh pin of operational amplifier U3B is connected to one end of capacitor C13 and the negative power supply voltage. -VCC connection, the other end of capacitor C13 is grounded; the other end of resistor R17 is connected to the sixth pin of AND gate, one end of sliding resistor RW5, one end of sliding resistor RW2 and the sixth pin of operational amplifier U3A respectively, the other end of sliding resistor RW2 is grounded, the other end of sliding resistor RW5 is connected to the seventh pin of operational amplifier U3A and one end of resistor R19, the other end of resistor R19 is grounded, the first pin of operational amplifier U3A is connected to one end of resistor R48, the other end of resistor R48 is connected to the positive power supply voltage +VCC, the fourth pin of operational amplifier U3A is connected to one end of capacitor C4, one end of capacitor C14 and the positive power supply voltage +VCC respectively, the other ends of capacitor C4 and the other ends of capacitor C14 are both grounded, the eleventh pin of operational amplifier U3A is connected to one end of capacitor C3 and the negative power supply voltage -VCC respectively, the other end of capacitor C3 is grounded.

[0009] Furthermore, the first color signal input amplification circuit includes resistors R1, R2, R5, R49, sliding resistors RW1 and RW4, capacitors C1 and C3, and operational amplifier U1A. One end of resistor R1 is connected to the second pin of interface P3 and one end of resistor R2, the other end of resistor R2 is connected to the fifth pin of operational amplifier U1A, the first pin of operational amplifier U1A is connected to one end of resistor R49, resistor R49 is connected to the positive power supply voltage +VCC, and the fourth pin of operational amplifier U1A is connected to... One end of capacitor C2 is connected to the positive power supply voltage +VCC, and the other end of capacitor C2 is grounded. The sixth pin of operational amplifier U1A is connected to one end of sliding resistor RW4 and one end of sliding resistor RW1, and the other end of sliding resistor RW1 is grounded. The other end of sliding resistor RW4 is connected to one end of resistor R5 and the seventh pin of operational amplifier U1A, and the other end of resistor R5 is grounded. The eleventh pin of operational amplifier U1A is connected to one end of capacitor C1 and the negative power supply voltage -VCC, and the other end of capacitor C1 is grounded.

[0010] Furthermore, the second color signal input amplifier circuit includes resistors R28, R29, R32, R47, sliding resistors RW3 and RW6, capacitors C5 and C6, and operational amplifier U5A. One end of resistor R28 is connected to the sixth pin of interface P3 and one end of resistor R29. The other end of resistor R29 is connected to the fifth pin of operational amplifier U5A. The first pin of operational amplifier U5A is connected to one end of resistor R47. Resistor R47 is connected to the positive power supply voltage +VCC. The fourth pin of operational amplifier U5A is connected to... Do not connect one end of the capacitor C6 and the positive power supply voltage +VCC. The other end of the capacitor C6 is grounded. The sixth pin of the operational amplifier U5A is connected to one end of the sliding resistor RW6 and one end of the sliding resistor RW3. The other end of the sliding resistor RW3 is grounded. The other end of the sliding resistor RW6 is connected to one end of the resistor R32 and the seventh pin of the operational amplifier U5A. The other end of the resistor R32 is grounded. The eleventh pin of the operational amplifier U5A is connected to one end of the capacitor C5 and the negative power supply voltage -VCC. The other end of the capacitor C5 is grounded.

[0011] Furthermore, the first color signal differential circuit includes resistors R6, R7, R8, R9, R10, R11, R12, R13, R42, and R43, capacitors C7 and C8, operational amplifier U1B, and operational amplifier U1C. One end of resistor R6 is connected to one end of resistor R5, the other end of sliding resistor RW4, the seventh pin of operational amplifier U1A, and one end of resistor R7. The other end of resistor R6 is connected to the twelfth pin of operational amplifier U1B. The second pin of operational amplifier U1B is connected to one end of resistor R42, and the other end of resistor R42 is connected to the positive power supply voltage +VCC. The fourth pin of operational amplifier U1B is connected to one end of capacitor C8 and the positive power supply voltage +VCC, and the other end of capacitor C8 is grounded. The eleventh pin of operational amplifier U1B is connected to one end of capacitor C7 and the negative power supply voltage -VCC. The other end of capacitor C7 is grounded. The thirteenth pin of operational amplifier U1B is connected to one end of resistor R9 and one end of resistor R10. The other end of resistor R9 is connected to one end of resistor R8 and grounded. The other end of resistor R10 is connected to the fourteenth pin of operational amplifier U1B and one end of resistor R11. The other end of resistor R11 is connected to the sixth pin of interface P1. The other end of resistor R7 is connected to one end of resistor R12 and the ninth pin of operational amplifier U1C. The other end of resistor R12 is connected to one end of resistor R13 and the eighth pin of operational amplifier U1C. The other end of resistor R13 is connected to the fifth pin of interface P1. The third pin of operational amplifier U1C is connected to one end of resistor R43. The other end of resistor R43 is connected to the positive power supply voltage +VCC. The tenth pin of operational amplifier U1C is connected to the other end of resistor R8.

[0012] Furthermore, the second color signal differential circuit includes resistors R20, R21, R22, R23, R24, R25, R26, R27, R41, and R44, capacitors C12 and C16, operational amplifier U4A, and operational amplifier U4B. One end of resistor R20 is connected to one end of resistor R19, the other end of sliding resistor RW5, the seventh pin of operational amplifier U3A, and one end of resistor R21. The other end of resistor R20 is connected to the fifth pin of operational amplifier U4A. The first pin of operational amplifier U4A is connected to one end of resistor R41, and the other end of resistor R41 is connected to the positive power supply voltage +VCC. The fourth pin of operational amplifier U4A is connected to one end of capacitor C12 and the positive power supply voltage +VCC, and the other end of capacitor C12 is grounded. The eleventh pin of operational amplifier U4A is connected to one end of capacitor C16 and the negative power supply voltage -VCC, and the other end of capacitor C16 is grounded. The sixth pin of operational amplifier U4A is connected to one end of resistor R23 and one end of resistor R24. The resistor R23 is connected to one end of the resistor R22 and grounded. The other end of the resistor R24 ​​is connected to the seventh pin of the operational amplifier U4A and one end of the resistor R25. The other end of the resistor R25 is connected to the fourth pin of the interface P1. The other end of the resistor R21 is connected to one end of the resistor R26 and the thirteenth pin of the operational amplifier U4B. The other end of the resistor R26 is connected to one end of the resistor R27 and the fourteenth pin of the operational amplifier U4B. The other end of the resistor R27 is connected to the fourth pin of the interface P1. The third pin of port P1 is connected to the second pin of the operational amplifier U4B, which is connected to one end of the resistor R44. The other end of the resistor R44 is connected to the positive power supply voltage +VCC. The fourth pin of the operational amplifier U4B is connected to one end of the capacitor C15 and the positive power supply voltage +VCC. The other end of the capacitor C15 is grounded. The eleventh pin of the operational amplifier U4B is connected to one end of the capacitor C9 and the negative power supply voltage -VCC. The other end of the capacitor C9 is grounded. The twelfth pin of the operational amplifier U4B is connected to the other end of the resistor R22.

[0013] Furthermore, the third color signal differential circuit includes resistors R33, R34, R35, R36, R37, R38, R39, R40, R45, and R43, capacitors C10 and C11, operational amplifier U5B, and operational amplifier U5C. One end of resistor R33 is connected to one end of resistor R32, the other end of sliding resistor RW6, the seventh pin of operational amplifier U5A, and one end of resistor R33. The other end of resistor R33 is connected to the twelfth pin of operational amplifier U5B. The second pin of operational amplifier U5B is connected to one end of resistor R45. The other end of resistor R45 is connected to the positive power supply voltage +VCC. The fourth pin of operational amplifier U5B is connected to one end of capacitor C11 and the positive power supply voltage +VCC. The other end of capacitor C11 is grounded. The eleventh pin of operational amplifier U5B is connected to one end of capacitor C10 and the negative power supply voltage -VC. With C connected, the other end of capacitor C10 is grounded. The thirteenth pin of operational amplifier U5B is connected to one end of resistor R36 and one end of resistor R37. The other end of resistor R36 is connected to one end of resistor R35 and grounded. The other end of resistor R37 is connected to the fourteenth pin of operational amplifier U5B and one end of resistor R38. The other end of resistor R38 is connected to the second pin of interface P1. The other end of resistor R34 is connected to one end of resistor R39 and the ninth pin of operational amplifier U5C. The other end of resistor R39 is connected to one end of resistor R40 and the eighth pin of operational amplifier U5C. The other end of resistor R40 is connected to the first pin of interface P1. The third pin of operational amplifier U5C is connected to one end of resistor R46. The other end of resistor R46 is connected to the positive power supply voltage +VCC. The tenth pin of operational amplifier U5C is connected to the other end of resistor R35.

[0014] According to another aspect of the present invention, a video signal conversion method for weather radar simulation is provided, the conversion method comprising the following steps:

[0015] S1. A color signal input amplifier circuit is used to process the color signals R, G, and B in the VGA signal respectively;

[0016] S2. The horizontal synchronization HS and vertical synchronization VS signals in the VGA signal are combined by the synchronization signal merging circuit to generate a combined synchronization signal;

[0017] S3. A green synchronization generation circuit is used to combine the combined synchronization signal with the amplified green G signal to generate a green superimposed synchronization signal.

[0018] S4. The amplified red (R), blue (B), and green sync signals are differentially processed by the signal differential circuit to generate the RGsB video signal.

[0019] Furthermore, the color signal input amplification circuit is implemented using an AD813 negative feedback operational amplifier circuit, the synchronization signal merging circuit is implemented using a 74S32 OR gate circuit, the green synchronization generation circuit is implemented using an adder circuit designed with an AD813 operational amplifier, and the color signal differential circuit is designed with complementary positive and negative inputs of two AD813 operational amplifiers.

[0020] The beneficial effects of this invention are as follows: This invention is built using basic discrete electronic components, resulting in low cost and simple maintenance. Furthermore, it employs discrete gate circuits and operational amplifier circuits instead of expensive FPGAs, ASICs, and other large-scale integrated circuits, making the design concise and effective, with low overall cost. The discrete circuits also offer high reliability and are less prone to failure. If a fault occurs, only the relevant individual circuit needs to be replaced, rather than the entire large-scale integrated circuit, simplifying repair and reducing maintenance costs. The video signal conversion circuit of this invention effectively solves the signal conversion and matching problem between mainstream computer HDMI signals and specialized industry-specific displays. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is one of the schematic diagrams of a video signal conversion circuit for weather radar simulation according to an embodiment of the present invention;

[0023] Figure 2 This is a second schematic diagram of a video signal conversion circuit for weather radar simulation according to an embodiment of the present invention;

[0024] Figure 3 This is a third schematic diagram of a video signal conversion circuit for weather radar simulation according to an embodiment of the present invention;

[0025] Figure 4 This is a circuit diagram of a synchronization signal merging circuit in a video signal conversion circuit for weather radar simulation according to an embodiment of the present invention;

[0026] Figure 5This is a circuit diagram of a green synchronization generation circuit in a video signal conversion circuit for weather radar simulation according to an embodiment of the present invention;

[0027] Figure 6 This is a circuit diagram of the first color signal input amplifier circuit in a video signal conversion circuit for weather radar simulation according to an embodiment of the present invention;

[0028] Figure 7 This is a circuit diagram of a second color signal input amplifier circuit in a video signal conversion circuit for weather radar simulation according to an embodiment of the present invention;

[0029] Figure 8 This is a circuit diagram of the first color signal differential circuit in a video signal conversion circuit for weather radar simulation according to an embodiment of the present invention;

[0030] Figure 9 This is a circuit diagram of the second color signal differential circuit in a video signal conversion circuit for weather radar simulation according to an embodiment of the present invention;

[0031] Figure 10 This is a circuit diagram of the third color signal differential circuit in a video signal conversion circuit for weather radar simulation according to an embodiment of the present invention;

[0032] Figure 11 This is a flowchart illustrating a video signal conversion method for weather radar simulation according to an embodiment of the present invention.

[0033] In the picture:

[0034] 1. Synchronization signal merging circuit; 2. Green synchronization generation circuit; 3. First color signal input amplification circuit; 4. Second color signal input amplification circuit; 5. First color signal differential circuit; 6. Second color signal differential circuit; 7. Third color signal differential circuit. Detailed Implementation

[0035] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0036] According to an embodiment of the present invention, a video signal conversion circuit and conversion method for weather radar simulation are provided.

[0037] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1-3As shown, according to an embodiment of the present invention, a video signal conversion circuit for weather radar simulation is provided. The conversion circuit includes a synchronization signal merging circuit 1, a green synchronization generation circuit 2, a first color signal input amplification circuit 3, a second color signal input amplification circuit 4, a first color signal differential circuit 5, a second color signal differential circuit 6, and a third color signal differential circuit 7. The principle of the video signal conversion circuit is to amplify the input red, green, and blue signals respectively, merge the input horizontal and vertical synchronization signals to generate a horizontal and vertical composite synchronization signal, merge the merged horizontal and vertical composite synchronization signal with the amplified green signal to generate a composite green synchronization signal, and then perform differential processing on the amplified red signal, the composite green synchronization signal, and the amplified blue signal respectively to generate differential signals, thereby completing the video signal conversion.

[0038] Specifically, the input terminals of the synchronization signal merging circuit 1 are connected to the eighth and ninth pins of interface P3, respectively, and the output terminal of the synchronization signal merging circuit 1 is connected to the green synchronization generation circuit 2; the input terminal of the green synchronization generation circuit 2 is connected to the fourth pin of interface P3, and the output terminal of the green synchronization generation circuit 2 is connected to the input terminal of the second color signal differential circuit 6, and the output terminal of the second color signal differential circuit 6 is connected to the fourth and third pins of interface P1, respectively; the input terminal of the first color signal input amplification circuit 3 is connected to the second pin of interface P3, and the output terminal of the first color signal input amplification circuit 3 is connected to the input terminal of the first color signal differential circuit 5, and the output terminal of the first color signal differential circuit 5 is connected to the fifth and sixth pins of interface P1, respectively; the input terminal of the second color signal input amplification circuit 4 is connected to the sixth pin of interface P3, and the output terminal of the second color signal input amplification circuit 4 is connected to the input terminal of the third color signal differential circuit 7, and the output terminal of the third color signal differential circuit 7 is connected to the second and first pins of interface P1, respectively.

[0039] Specifically, such as Figure 4 As shown, the principle of the synchronization signal merging circuit is to perform an OR gate operation on the horizontal synchronization signal and the vertical synchronization signal to obtain the horizontal and vertical composite signal. Specifically, the synchronization signal merging circuit 1 includes an OR gate, a NAND gate, and an AND gate. The first pin of the OR gate is connected to the ninth pin of the interface P3, the second pin of the OR gate is grounded, the third pin of the OR gate is connected to the fourth pin of the AND gate, the ninth pin of the NAND gate is connected to the eighth pin of the interface P3, the tenth pin of the NAND gate is grounded, and the eighth pin of the NAND gate is connected to the fifth pin of the AND gate.

[0040] Specifically, such as Figure 5As shown, the principle of the green sync generation circuit is to amplify the green signal through an operational amplifier, and then combine it with the horizontal and vertical sync signals through another operational amplifier to generate a composite green sync signal. Specifically, the green sync generation circuit 2 includes resistors R14, R15, R16, R17, R19, R48, R50, R51, sliding resistors RW2 and RW5, capacitors C3, C4, C13, C14, operational amplifiers U3A and U3B; the resistor R1 One end of resistor R14 is connected to the fourth pin of interface P3 and one end of resistor R15. The other end of resistor R14 is grounded. The other end of resistor R15 is connected to one end of resistor R16 and the thirteenth pin of operational amplifier U3B. The other end of resistor R16 is connected to the fourteenth pin of operational amplifier U3B and one end of resistor R17. The second pin of operational amplifier U3B is connected to one end of resistor R50. The other end of resistor R50 is connected to the positive power supply voltage +VCC. The eleventh pin of operational amplifier U3B is connected to one end of capacitor C13 and the negative power supply voltage -VCC, while the other end of capacitor C13 is grounded. The other end of resistor R17 is connected to the sixth pin of the AND gate, one end of sliding resistor RW5, one end of sliding resistor RW2, and the sixth pin of operational amplifier U3A. The other end of sliding resistor RW2 is grounded. The other end of sliding resistor RW5 is connected to the seventh pin of operational amplifier U3A and one end of resistor R19. The other end of resistor R19... One end of the operational amplifier U3A is grounded. The first pin of the operational amplifier U3A is connected to one end of the resistor R48, and the other end of the resistor R48 is connected to the positive power supply voltage +VCC. The fourth pin of the operational amplifier U3A is connected to one end of the capacitor C4, one end of the capacitor C14, and the positive power supply voltage +VCC. The other ends of the capacitors C4 and C14 are both grounded. The eleventh pin of the operational amplifier U3A is connected to one end of the capacitor C3 and the negative power supply voltage -VCC. The other end of the capacitor C3 is grounded.

[0041] Specifically, such as Figure 6As shown, the principle of the first color signal, i.e., the red signal amplification circuit, is to amplify the red signal through an operational amplifier. Specifically, the first color signal input amplification circuit 3 includes resistors R1, R2, R5, R49, sliding resistors RW1 and RW4, capacitors C1 and C3, and operational amplifier U1A. One end of resistor R1 is connected to the second pin of interface P3 and one end of resistor R2, respectively. The other end of resistor R2 is connected to the fifth pin of operational amplifier U1A. The first pin of operational amplifier U1A is connected to one end of resistor R49. Resistor R49 is connected to the positive power supply voltage +VCC. The operational amplifier U1A is connected as follows: its fourth pin is connected to one end of capacitor C2 and the positive power supply voltage +VCC, and the other end of capacitor C2 is grounded; its sixth pin is connected to one end of sliding resistor RW4 and one end of sliding resistor RW1, and the other end of sliding resistor RW1 is grounded; its other end of sliding resistor RW4 is connected to one end of resistor R5 and the seventh pin of operational amplifier U1A, and the other end of resistor R5 is grounded; and its eleventh pin is connected to one end of capacitor C1 and the negative power supply voltage -VCC, and the other end of capacitor C1 is grounded.

[0042] Specifically, such as Figure 7 As shown, the principle of the second color signal, i.e., the blue signal amplification circuit, is to amplify the blue signal through an operational amplifier. Specifically, the second color signal input amplification circuit consists of resistors R28, R29, R32, R47, sliding resistors RW3 and RW6, capacitors C5 and C6, and operational amplifier U5A. One end of resistor R28 is connected to the sixth pin of interface P3 and one end of resistor R29. The other end of resistor R29 is connected to the fifth pin of operational amplifier U5A. The first pin of operational amplifier U5A is connected to one end of resistor R47. Resistor R47 is connected to the positive power supply voltage +VC. The C-connection is as follows: the fourth pin of the operational amplifier U5A is connected to one end of the capacitor C6 and the positive power supply voltage +VCC, and the other end of the capacitor C6 is grounded; the sixth pin of the operational amplifier U5A is connected to one end of the sliding resistor RW6 and one end of the sliding resistor RW3, and the other end of the sliding resistor RW3 is grounded; the other end of the sliding resistor RW6 is connected to one end of the resistor R32 and the seventh pin of the operational amplifier U5A, and the other end of the resistor R32 is grounded; the eleventh pin of the operational amplifier U5A is connected to one end of the capacitor C5 and the negative power supply voltage -VCC, and the other end of the capacitor C5 is grounded.

[0043] Specifically, such as Figure 8 As shown, the principle of the differential circuit for the first color signal, i.e., the red signal, is to amplify and invert the red signal through two complementary operational amplifiers to obtain a differential signal. Specifically, the first color signal differential circuit 5 includes resistors R6, R7, R8, R9, R10, R11, R12, R13, R42, R43, capacitors C7 and C8, operational amplifier U1B, and operational amplifier U1C. One end of resistor R6 is connected to one end of resistor R5, and... The other end of the sliding resistor RW4, the seventh pin of the operational amplifier U1A, and one end of the resistor R7 are connected. The other end of the resistor R6 is connected to the twelfth pin of the operational amplifier U1B. The second pin of the operational amplifier U1B is connected to one end of the resistor R42. The other end of the resistor R42 is connected to the positive power supply voltage +VCC. The fourth pin of the operational amplifier U1B is connected to one end of the capacitor C8 and the positive power supply voltage +VCC. The other end of the capacitor C8 is grounded. The operational amplifier U1B... The eleventh pin of the operational amplifier U1B is connected to one end of the capacitor C7 and the negative power supply voltage -VCC, and the other end of the capacitor C7 is grounded. The thirteenth pin of the operational amplifier U1B is connected to one end of the resistor R9 and one end of the resistor R10, and the other end of the resistor R9 is connected to one end of the resistor R8 and grounded. The other end of the resistor R10 is connected to the fourteenth pin of the operational amplifier U1B and one end of the resistor R11, and the other end of the resistor R11 is connected to the sixth pin of the interface P1. The other end of the resistor R7 is connected to one end of the resistor R12 and the ninth pin of the operational amplifier U1C, and the other end of the resistor R12 is connected to one end of the resistor R13 and the eighth pin of the operational amplifier U1C. The other end of the resistor R13 is connected to the fifth pin of the interface P1. The third pin of the operational amplifier U1C is connected to one end of the resistor R43, and the other end of the resistor R43 is connected to the positive power supply voltage +VCC. The tenth pin of the operational amplifier U1C is connected to the other end of the resistor R8.

[0044] Specifically, such as Figure 9As shown, the principle of the differential circuit for the second color signal, i.e., the blue signal, is to amplify and invert the blue signal through two complementary operational amplifiers to obtain the differential signal. Specifically, the second color signal differential circuit 6 includes resistors R20, R21, R22, R23, R24, R25, R26, R27, R41, and R44, capacitors C12 and C16, operational amplifiers U4A and U4B. One end of resistor R20 is connected to one end of resistor R19, the other end of sliding resistor RW5, and the operational amplifier U4B. The seventh pin is connected to one end of resistor R21. The other end of resistor R20 is connected to the fifth pin of operational amplifier U4A. The first pin of operational amplifier U4A is connected to one end of resistor R41. The other end of resistor R41 is connected to the positive power supply voltage +VCC. The fourth pin of operational amplifier U4A is connected to one end of capacitor C12 and the positive power supply voltage +VCC. The other end of capacitor C12 is grounded. The eleventh pin of operational amplifier U4A is connected to one end of capacitor C16 and the negative power supply voltage -VCC. The other end of capacitor C16 is grounded. Pin 6 of operational amplifier U4A is connected to one end of resistor R23 and one end of resistor R24. The other end of resistor R23 is connected to one end of resistor R22 and grounded. The other end of resistor R24 ​​is connected to pin 7 of operational amplifier U4A and one end of resistor R25. The other end of resistor R25 is connected to pin 4 of interface P1. The other end of resistor R21 is connected to one end of resistor R26 and pin 13 of operational amplifier U4B. The other end of resistor R26 is connected to one end of resistor R27 and pin 14 of operational amplifier U4B. The other end of resistor R27 is connected to the third pin of interface P1. The second pin of operational amplifier U4B is connected to one end of resistor R44. The other end of resistor R44 is connected to the positive power supply voltage +VCC. The fourth pin of operational amplifier U4B is connected to one end of capacitor C15 and the positive power supply voltage +VCC. The other end of capacitor C15 is grounded. The eleventh pin of operational amplifier U4B is connected to one end of capacitor C9 and the negative power supply voltage -VCC. The other end of capacitor C9 is grounded. The twelfth pin of operational amplifier U4B is connected to the other end of resistor R22.

[0045] Specifically, such as Figure 10As shown, the principle of the differential circuit for the third color signal, i.e., the composite green sync signal, is to amplify and invert the composite green sync signal through two complementary operational amplifiers to obtain the differential signal. Specifically, the third color signal differential circuit 7 includes resistors R33, R34, R35, R36, R37, R38, R39, R40, R45, R43, capacitors C10 and C11, operational amplifier U5B, and operational amplifier U5C. One end of resistor R33 is connected to the resistor... One end of R32, the other end of the sliding resistor RW6, the seventh pin of the operational amplifier U5A, and one end of the resistor R33 are connected. The other end of the resistor R33 is connected to the twelfth pin of the operational amplifier U5B. The second pin of the operational amplifier U5B is connected to one end of the resistor R45. The other end of the resistor R45 is connected to the positive power supply voltage +VCC. The fourth pin of the operational amplifier U5B is connected to one end of the capacitor C11 and the positive power supply voltage +VCC. The other end of the capacitor C11 is grounded. The eleventh pin of the operational amplifier U5B is connected to one end of capacitor C10 and the negative power supply voltage -VCC, with the other end of capacitor C10 grounded. The thirteenth pin of the operational amplifier U5B is connected to one end of resistor R36 and one end of resistor R37, with the other end of resistor R36 connected to one end of resistor R35 and grounded. The other end of resistor R37 is connected to the fourteenth pin of the operational amplifier U5B and one end of resistor R38, with the other end of resistor R38 connected to the second pin of interface P1. The other end of resistor R34 is connected to one end of resistor R39 and the ninth pin of operational amplifier U5C. The other end of resistor R39 is connected to one end of resistor R40 and the eighth pin of operational amplifier U5C. The other end of resistor R40 is connected to the first pin of interface P1. The third pin of operational amplifier U5C is connected to one end of resistor R46. The other end of resistor R46 is connected to the positive power supply voltage +VCC. The tenth pin of operational amplifier U5C is connected to the other end of resistor R35.

[0046] According to another embodiment of the present invention, it can be seen from the circuit diagram that the impedance matching of the input and output is related to the circuit composed of resistors, capacitors, and operational amplifiers. Impedance matching of the video signal is achieved by adjusting the values ​​of the output resistors and capacitors, thus optimizing the signal transmission effect. Therefore, in this embodiment, ADV7611 and ADV7125 are used to convert the HDMI signal to a VGA signal. The VGA signal contains R, G, B, HS, and VS (red, green, blue, horizontal sync, vertical sync) signals. A voltage follower composed of operational amplifiers, resistors, and capacitors is used for impedance matching. Specifically, as shown... Figure 11 As shown, this embodiment provides a video signal conversion method for weather radar simulation, which includes the following steps:

[0047] S1. A color signal input amplifier circuit is used to process the color signals R, G, and B in the VGA signal respectively;

[0048] S2. The horizontal synchronization HS and vertical synchronization VS signals in the VGA signal are combined by the synchronization signal merging circuit to generate a combined synchronization signal;

[0049] S3. A green synchronization generation circuit is used to combine the combined synchronization signal with the amplified green G signal to generate a green superimposed synchronization signal.

[0050] S4. The amplified red (R), blue (B), and green sync signals are differentially processed by the signal differential circuit to generate the RGsB video signal.

[0051] The color signal input amplification circuit is implemented using an AD813 negative feedback operational amplifier circuit, the synchronization signal merging circuit is implemented using a 74S32 OR gate circuit, the green synchronization generation circuit is implemented using an adder circuit designed with an AD813 operational amplifier, and the color signal differential circuit is designed with complementary positive and negative inputs of two AD813 operational amplifiers.

[0052] In summary, by utilizing the above-described technical solution of this invention, which is constructed using basic discrete electronic components, this invention offers advantages such as low cost and simple maintenance. Furthermore, this invention employs discrete gate circuits and operational amplifier circuits, rather than using expensive large-scale integrated circuits such as FPGAs and ASICs, resulting in a concise and effective design with low overall cost. The discrete circuits also offer high reliability and are less prone to failure. Even if a fault occurs, only the relevant individual circuit needs to be replaced, rather than the entire large-scale integrated circuit, simplifying repair and reducing maintenance costs. The video signal conversion circuit of this invention effectively solves the signal conversion and matching problem between HDMI signals from mainstream computers and specialized industry-specific displays.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A video signal conversion circuit for weather radar simulation, characterized in that, The conversion circuit includes a synchronization signal merging circuit (1), a green synchronization generation circuit (2), a first color signal input amplifier circuit (3), a second color signal input amplifier circuit (4), a first color signal differential circuit (5), a second color signal differential circuit (6), and a third color signal differential circuit (7). The input terminals of the synchronization signal merging circuit (1) are connected to the eighth and ninth pins of the interface P3 respectively, and the output terminal of the synchronization signal merging circuit (1) is connected to the green synchronization generation circuit (2). The input terminal of the green synchronization generation circuit (2) is connected to the fourth pin of the interface P3, the output terminal of the green synchronization generation circuit (2) is connected to the input terminal of the second color signal differential circuit (6), and the output terminal of the second color signal differential circuit (6) is connected to the fourth pin and the third pin of the interface P1 respectively. The input terminal of the first color signal input amplifier circuit (3) is connected to the second pin of the interface P3, the output terminal of the first color signal input amplifier circuit (3) is connected to the input terminal of the first color signal differential circuit (5), and the output terminal of the first color signal differential circuit (5) is connected to the fifth pin and the sixth pin of the interface P1 respectively. The input terminal of the second color signal input amplifier circuit (4) is connected to the sixth pin of the interface P3, the output terminal of the second color signal input amplifier circuit (4) is connected to the input terminal of the third color signal differential circuit (7), and the output terminal of the third color signal differential circuit (7) is connected to the second pin and the first pin of the interface P1 respectively. The synchronization signal merging circuit (1) includes an OR gate, a NAND gate, and an AND gate. The first pin of the OR gate is connected to the ninth pin of the interface P3, the second pin of the OR gate is grounded, the third pin of the OR gate is connected to the fourth pin of the AND gate, the ninth pin of the NAND gate is connected to the eighth pin of the interface P3, the tenth pin of the NAND gate is grounded, and the eighth pin of the NAND gate is connected to the fifth pin of the AND gate. The conversion process of the video signal conversion circuit used for weather radar simulation includes the following steps: S1. A color signal input amplifier circuit is used to process the color signals R, G, and B in the VGA signal respectively; S2. The horizontal synchronization HS and vertical synchronization VS signals in the VGA signal are combined by the synchronization signal merging circuit to generate a combined synchronization signal; S3. A green synchronization generation circuit is used to combine the combined synchronization signal with the amplified green G signal to generate a green superimposed synchronization signal. S4. The amplified red (R), blue (B), and green sync signals are differentially processed by the signal differential circuit to generate the RGsB video signal.

2. The video signal conversion circuit for weather radar simulation according to claim 1, characterized in that, The green synchronization generation circuit (2) includes resistors R14, R15, R16, R17, R19, R48, R50, R51, sliding resistors RW2 and RW5, capacitors C3, C4, C13, C14, operational amplifier U3A, and operational amplifier U3B. One end of resistor R14 is connected to the fourth pin of interface P3 and one end of resistor R15, and the other end of resistor R14 is grounded. The other end of resistor R15 is connected to one end of resistor R16 and the thirteenth pin of operational amplifier U3B. The other end of resistor R16 is connected to the fourteenth pin of operational amplifier U3B and one end of resistor R17. The second pin of operational amplifier U3B is connected to one end of resistor R50, and the other end of resistor R50 is connected to the positive power supply voltage +VCC. The eleventh pin of operational amplifier U3B is connected to one end of capacitor C13 and the negative power supply voltage -VCC, and the other end of capacitor C13 is grounded. The other end of resistor R17 is connected to the sixth pin of the AND gate, one end of the sliding resistor RW5, one end of the sliding resistor RW2, and the sixth pin of operational amplifier U3A. The other end of the sliding resistor RW2 is grounded. The other end of the sliding resistor RW5 is connected to the seventh pin of operational amplifier U3A and one end of resistor R19. The other end of resistor R19 is grounded. The first pin of operational amplifier U3A is connected to one end of resistor R48. The other end of resistor R48 is connected to the positive power supply voltage +VCC. The fourth pin of operational amplifier U3A is connected to one end of capacitor C4, one end of capacitor C14, and the positive power supply voltage +VCC. The other ends of capacitor C4 and capacitor C14 are both grounded. The eleventh pin of operational amplifier U3A is connected to one end of capacitor C3 and the negative power supply voltage -VCC. The other end of capacitor C3 is grounded.

3. The video signal conversion circuit for weather radar simulation according to claim 1, characterized in that, The first color signal input amplifier circuit (3) includes resistors R1, R2, R5, R49, sliding resistors RW1 and RW4, capacitors C1 and C3, and operational amplifier U1A; One end of resistor R1 is connected to the second pin of interface P3 and one end of resistor R2. The other end of resistor R2 is connected to the fifth pin of operational amplifier U1A. The first pin of operational amplifier U1A is connected to one end of resistor R49, which is connected to the positive power supply voltage +VCC. The fourth pin of operational amplifier U1A is connected to one end of capacitor C2 and the positive power supply voltage +VCC, while the other end of capacitor C2 is grounded. The sixth pin of operational amplifier U1A is connected to one end of sliding resistor RW4 and one end of sliding resistor RW1, while the other end of sliding resistor RW1 is grounded. The other end of sliding resistor RW4 is connected to one end of resistor R5 and the seventh pin of operational amplifier U1A, while the other end of resistor R5 is grounded. The eleventh pin of operational amplifier U1A is connected to one end of capacitor C1 and the negative power supply voltage -VCC, while the other end of capacitor C1 is grounded.

4. The video signal conversion circuit for weather radar simulation according to claim 1, characterized in that, The second color signal input amplifier circuit (4) includes resistors R28, R29, R32, R47, sliding resistors RW3 and RW6, capacitors C5 and C6, and operational amplifier U5A. One end of resistor R28 is connected to the sixth pin of interface P3 and one end of resistor R29. The other end of resistor R29 is connected to the fifth pin of operational amplifier U5A. The first pin of operational amplifier U5A is connected to one end of resistor R47. Resistor R47 is connected to the positive power supply voltage +VCC. The fourth pin of operational amplifier U5A is connected to one end of capacitor C6 and the positive power supply voltage +VCC. The other end of capacitor C6 is grounded. The sixth pin of operational amplifier U5A is connected to one end of sliding resistor RW6 and one end of sliding resistor RW3. The other end of sliding resistor RW3 is grounded. The other end of sliding resistor RW6 is connected to one end of resistor R32 and the seventh pin of operational amplifier U5A. The other end of resistor R32 is grounded. The eleventh pin of operational amplifier U5A is connected to one end of capacitor C5 and the negative power supply voltage -VCC. The other end of capacitor C5 is grounded.

5. A video signal conversion circuit for weather radar simulation according to claim 3, characterized in that, The first color signal differential circuit (5) includes resistors R6, R7, R8, R9, R10, R11, R12, R13, R42, R43, capacitors C7 and C8, operational amplifier U1B and operational amplifier U1C. One end of resistor R6 is connected to one end of resistor R5, the other end of sliding resistor RW4, the seventh pin of operational amplifier U1A, and one end of resistor R7. The other end of resistor R6 is connected to the twelfth pin of operational amplifier U1B. The second pin of operational amplifier U1B is connected to one end of resistor R42. The other end of resistor R42 is connected to the positive power supply voltage +VCC. The fourth pin of operational amplifier U1B is connected to one end of capacitor C8 and the positive power supply voltage +VCC. The other end of capacitor C8... The eleventh pin of the operational amplifier U1B is connected to one end of the capacitor C7 and the negative power supply voltage -VCC, and the other end of the capacitor C7 is grounded. The thirteenth pin of the operational amplifier U1B is connected to one end of the resistor R9 and one end of the resistor R10, and the other end of the resistor R9 is connected to one end of the resistor R8 and grounded. The other end of the resistor R10 is connected to the fourteenth pin of the operational amplifier U1B and one end of the resistor R11, and the other end of the resistor R11 is connected to the sixth pin of the interface P1. The other end of resistor R7 is connected to one end of resistor R12 and the ninth pin of operational amplifier U1C. The other end of resistor R12 is connected to one end of resistor R13 and the eighth pin of operational amplifier U1C. The other end of resistor R13 is connected to the fifth pin of interface P1. The third pin of operational amplifier U1C is connected to one end of resistor R43. The other end of resistor R43 is connected to the positive power supply voltage +VCC. The tenth pin of operational amplifier U1C is connected to the other end of resistor R8.

6. The video signal conversion circuit for weather radar simulation according to claim 2, characterized in that, The second color signal differential circuit (6) includes resistors R20, R21, R22, R23, R24, R25, R26, R27, R41, R44, capacitors C12 and C16, operational amplifier U4A and operational amplifier U4B. One end of resistor R20 is connected to one end of resistor R19, the other end of sliding resistor RW5, the seventh pin of operational amplifier U3A, and one end of resistor R21. The other end of resistor R20 is connected to the fifth pin of operational amplifier U4A. The first pin of operational amplifier U4A is connected to one end of resistor R41. The other end of resistor R41 is connected to the positive power supply voltage +VCC. The fourth pin of operational amplifier U4A is connected to one end of capacitor C12 and the positive power supply voltage +VCC. The other end of capacitor C12... One end is grounded. The eleventh pin of the operational amplifier U4A is connected to one end of the capacitor C16 and the negative power supply voltage -VCC. The other end of the capacitor C16 is grounded. The sixth pin of the operational amplifier U4A is connected to one end of the resistor R23 and one end of the resistor R24. The other end of the resistor R23 is connected to one end of the resistor R22 and grounded. The other end of the resistor R24 ​​is connected to the seventh pin of the operational amplifier U4A and one end of the resistor R25. The other end of the resistor R25 is connected to the fourth pin of the interface P1. The other end of resistor R21 is connected to one end of resistor R26 and the thirteenth pin of operational amplifier U4B. The other end of resistor R26 is connected to one end of resistor R27 and the fourteenth pin of operational amplifier U4B. The other end of resistor R27 is connected to the third pin of interface P1. The second pin of operational amplifier U4B is connected to one end of resistor R44. The other end of resistor R44 is connected to the positive power supply voltage +VCC. The fourth pin of operational amplifier U4B is connected to one end of capacitor C15 and the positive power supply voltage +VCC. The other end of capacitor C15 is grounded. The eleventh pin of operational amplifier U4B is connected to one end of capacitor C9 and the negative power supply voltage -VCC. The other end of capacitor C9 is grounded. The twelfth pin of operational amplifier U4B is connected to the other end of resistor R22.

7. A video signal conversion circuit for weather radar simulation according to claim 4, characterized in that, The third color signal differential circuit (7) includes resistors R33, R34, R35, R36, R37, R38, R39, R40, R45, R43, capacitors C10 and C11, operational amplifier U5B and operational amplifier U5C. One end of resistor R33 is connected to one end of resistor R32, the other end of sliding resistor RW6, the seventh pin of operational amplifier U5A, and one end of resistor R33. The other end of resistor R33 is connected to the twelfth pin of operational amplifier U5B. The second pin of operational amplifier U5B is connected to one end of resistor R45. The other end of resistor R45 is connected to the positive power supply voltage +VCC. The fourth pin of operational amplifier U5B is connected to one end of capacitor C11 and the positive power supply voltage +VCC. The other end of capacitor C11... One end is grounded. The eleventh pin of the operational amplifier U5B is connected to one end of the capacitor C10 and the negative power supply voltage -VCC. The other end of the capacitor C10 is grounded. The thirteenth pin of the operational amplifier U5B is connected to one end of the resistor R36 and one end of the resistor R37. The other end of the resistor R36 is connected to one end of the resistor R35 and grounded. The other end of the resistor R37 is connected to the fourteenth pin of the operational amplifier U5B and one end of the resistor R38. The other end of the resistor R38 is connected to the second pin of the interface P1. The other end of resistor R34 is connected to one end of resistor R39 and the ninth pin of operational amplifier U5C. The other end of resistor R39 is connected to one end of resistor R40 and the eighth pin of operational amplifier U5C. The other end of resistor R40 is connected to the first pin of interface P1. The third pin of operational amplifier U5C is connected to one end of resistor R46. The other end of resistor R46 is connected to the positive power supply voltage +VCC. The tenth pin of operational amplifier U5C is connected to the other end of resistor R35.

8. The video signal conversion circuit for weather radar simulation according to claim 1, characterized in that, The color signal input amplification circuit is implemented using an AD813 negative feedback operational amplifier circuit, the synchronization signal merging circuit is implemented using a 74S32 OR gate circuit, the green synchronization generation circuit is implemented using an adder circuit designed with an AD813 operational amplifier, and the color signal differential circuit is designed with two AD813 operational amplifiers with complementary positive and negative inputs.

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