CN220964993U - Multifunctional video acquisition and superposition processor for airborne weather radar - Google Patents
Multifunctional video acquisition and superposition processor for airborne weather radar Download PDFInfo
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Abstract
The utility model discloses a multifunctional video acquisition superposition processor for an airborne weather radar, which mainly solves the problems of complicated video display and incomplete functions of the existing weather radar. The video superposition switching module comprises a video input module, a processor module, a signal processing module, a video output circuit and a video superposition switching module, and comprises a video input acquisition logic sub-module, a video processing logic sub-module, a video buffering logic sub-module, a video synthesis logic sub-module and a video output logic sub-module which are used for receiving an infrared XGA video signal, a satellite XGA video signal and a meteorological digital RGB video signal transmitted by the video input module, completing conversion, analysis and superposition copying of the video signal, obtaining a digital video output signal and transmitting the digital video output signal to the video output circuit. The method improves the operation convenience, enhances the superposition processing display function of radar and infrared or toilet pictures, and can be used for video processing of an airborne electronic system.
Description
Technical Field
The utility model belongs to the technical field of image processing, and particularly relates to a multifunctional video acquisition superposition processor which can be used for video processing and displaying of an airborne electronic system.
Background
The comprehensive aviation onboard electronic system is an important component part of a modern airplane and carries most task functions such as communication, navigation, identification, target detection, electronic countermeasure, weapon management, fire control calculation and the like, and in the comprehensive aviation onboard electronic system, the display control system is the most important part for interaction between the airplane and a pilot, and converts various flight parameter information into visual information such as graphic characters and the like which are intuitive in movement, so that the pilot can read more intuitively in real time and make judgment and decision in time. However, with the complexity of the development of modern airborne systems, the interaction between devices is also more and more complex, and the information to be displayed by the airborne display system is also more and more, so that the requirement of video display quality is also continuously improved.
Based on the requirements, in the aspect of video display of the novel airborne weather radar in China, not only the production and display of weather pictures are required, but also the transmission display function of carrying information such as infrared pictures and satellite communication information is required.
Patent document with publication number CN116258767a discloses a real-time updating method for airborne weather radar images, which rapidly draws weather radar images in real time in a flight display, constructs a plurality of textures, and remarkably improves rendering performance by improving the updating efficiency of the textures. The method only completes quick real-time drawing of the weather radar image in the flight display, and does not contain the functions of infrared picture display and satellite communication display.
Patent document with publication number CN114236642A discloses a networking type route weather detection method based on a satellite network, which is characterized in that the airborne weather radar data and the weather sensor data of each aircraft flying on the route are downloaded to the ground in real time through the satellite network, the data are concentrated and analyzed by route weather detection software on the ground to obtain an accurate route weather detection result, the result is returned to the EFB of each aircraft on the route in real time through the satellite network, and the aircraft unit adjusts the course according to the result. The method has the transmission function of satellite data and weather detection data only, and does not contain the weather picture switching display function.
The method does not have an infrared picture superposition display function, so that satellite communication only has data transmission and does not have switching display of weather radar pictures, and the requirements of picture display and signal transmission of an aircraft under emergency conditions such as fire rescue and the like can not be met. If the infrared picture display function is to be met, additional infrared display equipment is required to be added, but the solution not only causes complicated display, but also increases the operation difficulty, so that a product with more visual picture display, weather picture, toilet picture and infrared picture capable of being overlapped and switched is needed in the market.
Disclosure of utility model
Aiming at the defects of the prior art, the utility model provides a multifunctional video acquisition superposition processor for an airborne weather radar, so as to enhance superposition processing display of radar pictures and infrared or defensive pictures, improve operation convenience and meet the requirement of multifunctional video receiving and transmitting switching.
The technical scheme for achieving the purpose is as follows:
1. A multifunctional video acquisition and superposition processor for airborne weather radar comprises a video input module 1, a processor module 2, a signal processing module 3 and a video output circuit 4, and is characterized in that: a video superposition switching module 5 is connected between the video input module 1 and the video output circuit 4, and is used for receiving the infrared XGA video signal, the satellite XGA video signal and the weather digital RGB video signal transmitted by the video input module 1, completing the conversion, analysis, superposition and duplication of the video signal, obtaining a digital video output signal and transmitting the digital video output signal to the video output circuit 4.
Further, the video overlapping switching module 5 includes:
The video input acquisition logic sub-module 51 is configured to receive the infrared XGA video data, the guard XGA video data, and the weather RGB video data transmitted by the video input module 1, and convert the weather RGB video data into a weather AXIS video data stream, and transmit the weather AXIS video data stream and the two paths of XGA video data together to the video processing logic sub-module 52;
The video processing logic sub-module 52 is configured to receive the video acquisition superposition control instruction transmitted from the processor module 2, select one of the two paths of XGA video data transmitted from the video input acquisition logic sub-module 51 under the control of the instruction, perform optimization processing on the format of the two paths of XGA video data, generate an infrared/guard XGA video data stream, and output the infrared/guard XGA video data stream to the video buffer logic sub-module 53 together with the meteorological video data stream;
The video buffering logic sub-module 53 is configured to perform buffering synchronization and clipping on the received infrared/guard XGA video data stream and the meteorological video data stream, and output the buffered and clipped video data stream to the video synthesizing logic sub-module 54;
The video synthesis logic sub-module 54 is configured to obtain an infrared/weitong XGA video data stream and an meteorological AXIS video data stream from the video cache logic sub-module 53 according to a video timing signal generated by the video synthesis logic sub-module 54, synthesize the obtained two paths of video data streams into a meteorological-infrared video data stream or a meteorological-Wei Tongshi video data stream by using a synthesis algorithm according to a video acquisition superposition control instruction transmitted by the processor module 2, and transmit the meteorological AXIS video data stream to the video output logic sub-module 55, or separately transmit the meteorological AXIS video data stream to the video output logic sub-module 55;
The video output logic sub-module 55 is configured to convert and copy the received weather AXIS video data stream or weather-infrared video data stream or weather-Wei Tongshi video data stream into three identical digital video output signals according to the video timing signals transmitted by the video synthesis logic sub-module 54, and transmit the three identical digital video output signals to the video output circuit 4.
Compared with the prior art, the invention has the following advantages:
1. The video superposition switching module is additionally arranged, so that images transmitted by the Ku frequency band satellite communication equipment and the infrared imaging equipment can be subjected to superposition processing while the image mapping and displaying of the weather radar are completed, and weather pictures, weather-infrared pictures or weather-satellite pictures are selectively output, so that the display equipment is simplified, and the target display is more definite;
2. The utility model adopts the high-performance FPGA chip to independently realize the video synthesis function of the video superposition switching module, so that the required images can be rapidly switched and output under the control of the control instruction.
Drawings
FIG. 1 is a schematic block diagram of the present utility model;
FIG. 2 is a block diagram of a video overlay switching module according to the present utility model;
FIG. 3 is a schematic block diagram of a video input module according to the present utility model;
FIG. 4 is a schematic block diagram of a processor module in accordance with the present utility model;
FIG. 5 is a schematic block diagram of a signal processing module according to the present utility model;
Fig. 6 is a schematic block diagram of a video output circuit in accordance with the present utility model.
Detailed Description
Embodiments of the present utility model are described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, the multifunctional video acquisition and superposition processor of the present utility model includes a video input module 1, a processor module 2, a signal processing module 3, a video output circuit 4 and a video superposition switching module 5. The input of the video input module 1 is connected with the output and the external input of the processor module 2, and the output of the video input module 1 is connected with the input of the video superposition switching module 5; the input of the processor module 2 is connected with the output of the signal processing module 3, and the output of the processor module 2 is connected with the input of the video input module 1 and the input of the video superposition switching module 5; the input of the signal processing module 3 is connected with an external input, and the output of the signal processing module 3 is connected with the input of the processor module 2; the input of the video output circuit 4 is connected with the output of the video superposition switching module 5, and the video output circuit 4 directly outputs to the outside; the input of the video superposition switching module 5 is connected with the output of the video input module 1 and the output of the processor module 2, and the output of the video superposition switching module 5 is connected with the input of the video output circuit 4.
The signal processing module 3 receives an external input weather radar working state signal, a satellite communication working state signal and an infrared picture working state signal, performs level conversion, analysis and synthesis to generate a signal FPGA data packet, and transmits the signal FPGA data packet to the processor module 2 through a PCI-E internal bus; the processor module 2 receives the FPGA data packet at the signal position, analyzes and synthesizes the FPGA data packet to generate a video acquisition superposition control instruction and a meteorological HDMI video signal, and transmits the video acquisition superposition control instruction to the video superposition switching module 5 and the meteorological HDMI video signal to the video input module 1; the video input module 1 converts an externally input infrared XGA video signal and a toilet XGA video signal into infrared XGA video data and toilet XGA video data, and transmits the infrared XGA video data and the toilet XGA video data to the video superposition switching module 5, and converts a meteorological HDMI video signal transmitted by the processor module 2 into meteorological RGB video data, and transmits the meteorological RGB video data to the video superposition switching module 5; the video superposition switching module 5 converts, synchronously caches, cuts and synthesizes the infrared XGA video data, the satellite XGA video data and the weather RGB video data transmitted by the video input module 1 under the control of the video acquisition superposition control instruction transmitted by the processor module 2 to obtain a weather AXIS video data stream or a weather-infrared video data stream or a weather-Wei Tongshi video data stream, copies the weather AXIS video data stream or the weather-infrared video data stream into three identical digital video output signals, and transmits the three identical digital video output signals to the video output circuit 4; the video output circuit 4 receives three paths of digital video output signals transmitted by the video superposition switching module (5), and converts the three paths of digital video output signals into one path of XGA video output signals and two paths of VGA video output signals for external transmission.
Referring to fig. 2, the video overlay switching module 5 of the present utility model is implemented by using an X7K325T or a higher performance chip of the same type, and includes a video input acquisition logic sub-module 51, a video processing logic sub-module 52, a video buffering logic sub-module 53, a video synthesis logic sub-module 54, and a video output logic sub-module 55, which respectively perform different functions, wherein:
The video input collection logic sub-module 51 is configured to receive the infrared XGA video data, the guard XGA video data, and the weather RGB video data transmitted by the video input module 1, and convert the weather RGB video data into a weather AXIS video data stream, and transmit the weather AXIS video data stream and the two paths of XGA video data together to the video processing logic sub-module 52;
the video processing logic sub-module 52 is configured to receive the video acquisition superposition control instruction transmitted by the processor module 2, select one of the two paths of XGA video data transmitted by the video input acquisition logic sub-module 51 under the control of the instruction, perform optimization processing on the format of the video input superposition control instruction, generate an infrared/guard XGA video data stream, and output the infrared/guard XGA video data stream and the meteorological AXIS video data stream to the video buffer logic sub-module 53 together;
The video buffering logic sub-module 53 is configured to receive the infrared/guard XGA video data stream and the meteorological AXIS video data stream transmitted by the video processing logic sub-module 52, perform buffering synchronization and clipping, and output the video data streams to the video synthesizing logic sub-module 54;
the video synthesis logic sub-module 54 is configured to receive the video acquisition superposition control instruction transmitted by the processor module 2, and under the control of the instruction, obtain an infrared/satellite XGA video data stream and an air image AXIS video data stream from the video cache logic sub-module 53 according to a video timing signal generated by the video synthesis logic sub-module, and synthesize the obtained two paths of video data streams into a weather-infrared video data stream or a weather-Wei Tongshi video data stream by using a synthesis algorithm, and transmit the weather-infrared video data stream or the weather-Wei Tongshi video data stream to the video output logic sub-module 55, or separately transmit the weather AXIS video data stream to the video output logic sub-module 55;
The video output logic sub-module 55 is configured to receive the video timing signal transmitted by the video synthesis logic sub-module 54, convert and copy the received weather AXIS video data stream or weather-infrared video data stream or weather-Wei Tongshi video data stream into three identical digital video output signals according to the video timing signal, and transmit the three identical digital video output signals to the video output circuit 4.
The X7K325T chip used in the video overlay switching module 5 of this example is a chip manufactured by Xilinx corporation, or JFM K325T chip of the compound micro-electronics corporation, which is not limited herein.
Referring to fig. 3, the video input module 1 according to the present utility model includes an XGA video signal conversion circuit 11, an analog-to-digital conversion circuit 12, and a video signal conversion circuit 13. The input of the XGA video signal conversion circuit 11 is connected with an external input, and the output of the XGA video signal conversion circuit 11 is connected with the input of the analog-to-digital conversion circuit 12; the input of the analog-to-digital conversion circuit 12 is connected with the output of the XGA video signal conversion circuit 11, and the output of the analog-to-digital conversion circuit 12 is connected with the input of the video superposition switching module 5; the input of the weather video signal conversion circuit 13 is connected with an external input, and the output of the weather video signal conversion circuit 13 is connected with the input of the video superposition switching module 5. Wherein:
The XGA video signal conversion circuit 11 is implemented by adopting 2 AD8145 or a higher performance chip of the same type, and is used for converting an infrared XGA video signal and a guard XGA video signal which are input from outside into an infrared VGA video signal and a guard VGA video signal, and transmitting the infrared XGA video signal and the guard XGA video signal to the analog-to-digital conversion circuit 12;
The analog-to-digital conversion circuit 12 is realized by adopting 2 ADV7403 or a higher performance chip of the same type, and is used for converting the infrared VGA video signal and the satellite VGA video signal transmitted by the XGA video signal conversion circuit 11 into infrared XGA video data and satellite XGA video data, and transmitting the infrared VGA video data and the satellite XGA video data to the video superposition switching module 5;
the weather video signal conversion circuit 13 is implemented by adopting 1 slice of ADV7611 or a chip with the same type and higher performance, and is used for converting the weather HDMI video signal transmitted by the processor module 2 into weather RGB video data, and transmitting the weather RGB video data to the video superposition switching module 5.
The AD8145, ADV7611, and ADV7403 chips used in the video input module 1 of this example are chips manufactured by ADI corporation, and GM7145, GM7611 chips, and ADV7510 of ADI corporation of vibroseis technology corporation may also be used, which are not limited herein.
Referring to fig. 4, the processor module 2 of the present utility model is implemented by using an i.mx6qp or other CPU with the same configuration, and includes a control instruction sub-module 21 and an meteorological image processing sub-module 22, which respectively perform different functions, where:
The control instruction submodule 21 is used for generating a video acquisition superposition control instruction and transmitting the video acquisition superposition control instruction to the video superposition switching module 5 and the meteorological picture processing submodule 22;
The weather image processing sub-module 22 is configured to receive the signal FPGA data packet transmitted from the signal processing module 3 and the video acquisition superposition control command transmitted from the control command sub-module 21, make a weather radar display image or a weather display character image according to the video acquisition superposition control command by using OpenGLES graphics processing function library, perform raster graphics rendering, obtain a weather HDMI video signal, and transmit the weather HDMI video signal to the video input module 1.
Referring to fig. 5, the signal processing module 3 according to the present utility model includes a signal processor 31, an ARINC429 level conversion circuit 32, an RS422 level conversion circuit 33, and a GPIO interface transceiver circuit 34. The input of the signal processor 31 is connected with the outputs of the ARINC429 level conversion circuit 32, the RS422 level conversion circuit 33 and the GPIO interface transceiver circuit 34, respectively, and the output of the signal processor 31 is connected with the input of the processor module 2.
The GPIO interface transceiver circuit 34 is implemented by using 4 8T245 chips or higher performance chips of the same type, and is configured to convert the level of an externally input weather radar working state signal and transmit the converted signal to the signal processor 31; the RS422 level conversion circuit 33 is implemented by using an AM26LV32 chip or a higher performance chip of the same type, and is configured to perform level conversion on an externally input satellite communication operating state signal and transmit the signal to the signal processor 31; the ARINC429 level conversion circuit 32 is realized by using an HI-8591 chip or a higher performance chip of the same type and is used for carrying out level conversion on an externally input infrared picture working state signal and then transmitting the signal to the signal processor 31; the signal processor 31 is implemented by an X7K325T chip or a higher performance chip of the same type, and is configured to receive the infrared picture operating state signal transmitted by the ARINC429 level conversion circuit 32, the satellite communication operating state signal transmitted by the RS422 level conversion circuit 33, and the weather radar operating state signal transmitted by the GPIO interface transceiver circuit 34, analyze and synthesize the three state signals, generate an FPGA data packet at the site, and transmit the FPGA data packet to the processor module 2.
The chips used in the signal processing module 3 of this example are 8T245 chip manufactured by Texas instruments, AM26LV32 chip, HI-8591 chip manufactured by Tolt and X7K325T chip manufactured by Xilinx, SMLVC T245 chip of Shenzhen micro-company, TPT4032-SO3R chip of Cili, GMH8482 chip of Corp and JFM K325T chip of complex denier micro-electronics, which are not limited herein.
Referring to fig. 6, the video output circuit 4 according to the present utility model includes a digital-to-analog conversion circuit 41 and a single-ended-to-differential circuit 42. The input of the digital-to-analog conversion circuit 41 is connected with the output of the video superposition switching module 5, and the output of the digital-to-analog conversion circuit 41 is provided with two paths which are respectively connected with the input and the external output of the single-ended differential conversion circuit 42; an input of the single-ended-to-differential circuit 42 is connected to an output of the analog-to-digital converter circuit 41, and the single-ended-to-differential circuit 42 is directly connected to an external display device.
The digital-to-analog conversion circuit 41 is implemented by adopting 3 ADV7123 chips or higher performance chips of the same type, and is configured to receive three paths of digital video output signals transmitted from the video superposition switching module 5, convert the three paths of digital video output signals into three paths of XGA video output signals, externally transmit one path of XGA video output signals, and transmit two paths of XGA video output signals to the single-ended-to-differential circuit 42;
The single-end-to-differential circuit 42 is implemented by using 2 AD8148 chips or higher performance chips of the same type, and is configured to receive two paths of XGA video output signals transmitted from the digital-to-analog conversion circuit 41, and convert the two paths of XGA video output signals into two paths of VGA video output signals for external transmission.
The ADV7123 and AD8148 chips used in the video output circuit 4 of the present example are chips manufactured by ADI corporation, and GMG7123 and GM7148 chips manufactured by vibro-core technologies may be used, which are not limited herein.
The foregoing description is only one specific example of the utility model and is not intended to limit the utility model in any way, and it will be apparent to those skilled in the art that various modifications and changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (9)
1. The utility model provides a multi-functional video acquisition stack treater for airborne weather radar, includes video input module (1), processor module (2), signal processing module (3) and video output circuit (4), its characterized in that: a video superposition switching module (5) is connected between the video input module (1) and the video output circuit (4) and is used for receiving the infrared XGA video signal, the Weitong XGA video signal and the meteorological digital RGB video signal transmitted by the video input module (1), completing the conversion, analysis, superposition and duplication of the video signal, obtaining a digital video output signal and transmitting the digital video output signal to the video output circuit (4).
2. The processor according to claim 1, wherein: the video superposition switching module (5) is realized by adopting an X7K325T or a chip with higher performance of the same type, and comprises:
the video input acquisition logic sub-module (51) is used for receiving the infrared XGA video data, the Weitong XGA video data and the weather RGB video data transmitted by the video input module (1), converting the weather RGB video data into a weather AXIS video data stream and transmitting the weather AXIS video data stream and the two paths of XGA video data to the video processing logic sub-module (52);
The video processing logic sub-module (52) is used for receiving the video acquisition superposition control instruction transmitted by the processor module (2), selecting one of two paths of XGA video data transmitted by the video input acquisition logic sub-module (51) under the control of the instruction, optimizing the format of the video data, generating an infrared/guard XGA video data stream, and outputting the infrared/guard XGA video data stream and the meteorological AXIS video data stream to the video cache logic sub-module (53);
The video buffering logic sub-module (53) is used for buffering, synchronizing and cutting the received infrared/Weitong XGA video data stream and the received meteorological AXIS video data stream, and outputting the video data stream to the video synthesizing logic sub-module (54);
The video synthesis logic sub-module (54) is used for acquiring an infrared/Weitong XGA video data stream and an air image AXIS video data stream from the video cache logic sub-module (53) according to a video time sequence signal generated by the video synthesis logic sub-module, synthesizing the acquired two paths of video data streams into a weather-infrared video data stream or a weather-Wei Tongshi video data stream by using a synthesis algorithm according to a video acquisition superposition control instruction transmitted by the processor module (2), and transmitting the weather AXIS video data stream to the video output logic sub-module (55) or independently transmitting the weather AXIS video data stream to the video output logic sub-module (55);
The video output logic sub-module (55) is used for converting and copying the received weather AXIS video data stream or weather-infrared video data stream or weather-Wei Tongshi video data stream into three paths of same digital video output signals according to the video time sequence signals transmitted by the video synthesis logic sub-module (54), and transmitting the three paths of same digital video output signals to the video output circuit (4).
3. The processor according to claim 1, wherein: the video input module (1) comprises:
The device comprises an XGA video signal conversion circuit (11), an analog-to-digital conversion circuit (12) and a meteorological video signal conversion circuit (13), wherein the output of the XGA video signal conversion circuit (11) is connected with the input of the analog-to-digital conversion circuit (12), the output of the analog-to-digital conversion circuit (12) is connected with the input of a video superposition switching module (5), the input of the meteorological video signal conversion circuit (13) is connected with the output of a processor module (2), and the output of the meteorological video signal conversion circuit (13) is connected with the video superposition switching module (5).
4. A processor according to claim 3, characterized in that:
The XGA video signal conversion circuit (11) is realized by adopting an AD8145 chip or a higher performance chip of the same type and is used for converting an infrared XGA video signal and a guard XGA video signal which are input from outside into an infrared VGA video signal and a guard VGA video signal and transmitting the infrared XGA video signal and the guard VGA video signal to the analog-to-digital conversion circuit (12);
The analog-digital conversion circuit (12) is realized by adopting an ADV7403 chip or a higher performance chip of the same type and is used for converting the infrared VGA video signal and the guard VGA video signal transmitted by the XGA video signal conversion circuit (11) into infrared XGA video data and guard XGA video data and transmitting the infrared XGA video data and guard XGA video data to the video superposition switching module (5);
The meteorological video signal conversion circuit (13) is realized by adopting an ADV7611 chip or a higher performance chip of the same type and is used for converting the meteorological HDMI video signal transmitted by the processor module (2) into meteorological RGB video data and transmitting the meteorological RGB video data to the video superposition switching module (5).
5. The processor according to claim 1, wherein: the processor module (2) comprises:
The control instruction submodule (21) is used for generating a video acquisition superposition control instruction and transmitting the video acquisition superposition control instruction to the video superposition switching module (5) and the meteorological picture processing submodule (22);
The meteorological image processing sub-module (22) is used for receiving the signal FPGA data packet transmitted by the signal processing module (3) and the video acquisition superposition control instruction transmitted by the control instruction sub-module (21), manufacturing a meteorological radar display image or a meteorological display character image according to the video acquisition superposition control instruction by using OpenGLES graphic processing function library, performing raster graphic rendering, obtaining a meteorological HDMI video signal and transmitting the meteorological HDMI video signal to the video input module (1).
6. The processor according to claim 1, wherein: the signal processing module (3) comprises:
The device comprises a signal processor (31), an ARINC429 level conversion circuit (32), an RS422 level conversion circuit (33) and a GPIO interface transceiving circuit (34), wherein the input of the signal processor (31) is respectively connected with the outputs of the ARINC429 level conversion circuit (32), the RS422 level conversion circuit (33) and the GPIO interface transceiving circuit (34), and the output of the signal processor (31) is connected with the input of a processor module (2).
7. The processor as set forth in claim 6, wherein:
The GPIO interface transceiver circuit (34) is realized by an 8T245 chip or a higher performance chip of the same type and is used for carrying out level conversion on an externally input weather radar working state signal and then transmitting the signal to the signal processor (31);
The RS422 level conversion circuit (33) is realized by adopting an AM26LV32 chip or a higher performance chip of the same type and is used for carrying out level conversion on an externally input satellite communication working state signal and then transmitting the signal to the signal processor (31);
The ARINC429 level conversion circuit (32) is realized by using an HI-8591 chip or a higher performance chip of the same type and is used for carrying out level conversion on an externally input infrared picture working state signal and then transmitting the signal to the signal processor (31);
The signal processor (31) is realized by adopting an X7K325T chip or a chip with higher performance of the same type, and is used for receiving an infrared picture working state signal transmitted by the ARINC429 level conversion circuit (32), a satellite communication working state signal transmitted by the RS422 level conversion circuit (33) and a weather radar working state signal transmitted by the GPIO interface transceiver circuit (34), analyzing and synthesizing the three state signals, and generating a signal FPGA data packet to be transmitted to the processor module (2).
8. The processor according to claim 1, wherein: the video output circuit (4) includes:
The digital-to-analog conversion circuit (41) and the single-end rotating differential circuit (42), wherein the input of the digital-to-analog conversion circuit (41) is connected with the output of the video superposition switching module (5), and the output of the digital-to-analog conversion circuit (41) is provided with two paths which are respectively connected with the input and the external output of the single-end rotating differential circuit (42).
9. The processor as set forth in claim 8, wherein:
The digital-to-analog conversion circuit (41) is realized by adopting an ADV7123 chip or a higher performance chip of the same type and is used for receiving three paths of digital video output signals transmitted by the video superposition switching module (5), converting the three paths of digital video output signals into three paths of XGA video output signals, transmitting one path of XGA video output signals to the outside, and transmitting two paths of XGA video output signals to the single-ended differential-to-differential circuit (42);
The single-ended rotary differential circuit (42) is realized by adopting an AD8148 chip or a higher performance chip of the same type, and is used for receiving two paths of XGA video output signals transmitted by the digital-to-analog conversion circuit (41) and converting the two paths of XGA video output signals into two paths of VGA video output signals for external transmission.
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