Analog video signal long-distance stable transmission system and server

Abstract

The invention provides an analog video signal long-distance stable transmission system and a server, and relates to the technical field of signal transmission, the system comprises a camera, a display host, a first current loop and a second current loop, the first current loop comprises a 12V power supply and a power ground, the first current loop is used for supplying power to the camera end of the camera through the 12V power supply, and the second current loop is used for supplying power to the display host; the current is returned to the display host through the power ground, so that the current is prevented from flowing back to the camera end; the second current loop is a camera internal chip current loop and comprises a camera internal chip power supply and a camera ground, and the second current loop is used for supplying power to a main control chip in the camera through the camera internal chip power supply to enable the main control chip to operate normally and returning current to the camera through the camera ground. The current in the second current loop is prevented from flowing back to the power ground, so that the first current loop and the second current loop respectively flow back. The stability of long-distance transmission of analog video signals can be remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of signal transmission, and in particular to a long-distance stable transmission system and a server for analog video signals. Background Art

[0002] At present, relevant technologies have proposed that when transmitting the video signal of the camera, the display host can be used to power the camera through a 12V power supply. The camera is connected to the display host through a single ground wire loop, so that the analog video signal of the camera is transmitted to the display host through the signal line, so that the display host can then display the image. However, this solution does not work well during long-distance transmission (when the wire is too long). Since the longer the transmission line, the greater the internal resistance of the wire, if the power consumption of the camera changes dynamically, the transmission current will change. At this time, there will also be a changing potential difference between the two ends of the power-ground transmission line. The video signal is relative to the reference ground, and the transmission of the video signal will also be relatively superimposed with the changing ground signal, resulting in severe horizontal stripes on the camera, which will seriously affect the video stability of the product. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a long-distance stable transmission system and server for analog video signals, which can significantly improve the stability of long-distance transmission of analog video signals.

[0004] In the first aspect, an embodiment of the present invention provides a long-distance stable transmission system for analog video signals, the system comprising: a camera, a display host, a first current loop and a second current loop, the camera being connected to the display host via the first current loop and the second current loop; wherein the first current loop is the display host current loop, comprising: a 12V power supply and a power ground, the first current loop being used to power a camera end of the camera via a 12V power supply, and returning the current to the display host via the power ground to avoid current backflow to the camera end; the second current loop is the camera's internal chip current loop, comprising: a camera's internal chip power supply and a camera ground, the second current loop being used to power a main control chip in the camera via the camera's internal chip power supply to enable the main control chip to operate normally, and returning the current to the camera via the camera ground to avoid current in the second current loop from flowing back to the power ground, so that the first current loop and the second current loop each flow back.

[0005] In one embodiment, the system further includes: a third current loop; wherein the third current loop includes: a signal transmission circuit and a camera ground, and the third current loop is used to send the analog signal generated by the camera to the display host.

[0006] In one embodiment, the system also includes: an isolated DC / DC switching converter, which is arranged in the first current loop; wherein the isolated DC / DC switching converter is used to rectify the input current of the 12V power supply and input the rectified current to the camera end.

[0007] In one embodiment, a camera includes: an image sensor; wherein the image sensor is used to convert light input to a camera end into a first analog video signal, wherein the analog video signal is an electrical signal.

[0008] In one embodiment, the image sensor includes: an analog-to-digital converter; wherein the analog-to-digital converter is used to convert a first analog video signal from an electrical signal into a first digital video signal.

[0009] In one embodiment, the camera also includes: an image signal processor, which is connected to the image sensor; wherein the image signal processor is used to perform image optimization processing on the first digital video signal after the first analog video signal is converted to improve the image quality and determine the second digital video signal, wherein the image optimization processing includes: noise reduction processing, white balance processing, exposure compensation processing, color correction processing, and sharpening and contrast adjustment processing.

[0010] In one embodiment, the camera also includes: a digital-to-analog conversion module, which is connected to the image signal processor; wherein the digital-to-analog conversion module is used to convert the second digital video signal into a second analog video signal, so that the second analog video signal is transmitted to the display host through the signal transmission circuit.

[0011] In one embodiment, the display host further includes: an analog-to-digital conversion module; wherein the analog-to-digital conversion module is used to receive the second analog video signal and convert the second analog video signal into a third digital video signal.

[0012] In one embodiment, the display host also includes: a digital signal processor and a display screen, and the digital signal processor is connected to the analog-to-digital conversion module and the display screen respectively; wherein the digital signal processor is used to perform digital filtering processing on the third digital video signal, determine the target video signal, and display the image corresponding to the target video signal through the display screen.

[0013] In a second aspect, an embodiment of the present invention further provides a server, comprising a processor and a memory, wherein the memory stores computer executable instructions that can be executed by the processor, and the processor executes the computer executable instructions to implement signal transmission in any system of the first aspect.

[0014] The embodiments of the present invention bring the following beneficial effects:

[0015] An embodiment of the present invention provides a long-distance stable transmission system and server for analog video signals, the system comprising: a camera, a display host, a first current loop and a second current loop, the camera is connected to the display host through the first current loop and the second current loop; wherein the first current loop is a display host current loop, comprising: a 12V power supply and a power ground, the first current loop is used to power a camera end of the camera through the 12V power supply, and return the current to the display host through the power ground to avoid the current flowing back to the camera end; the second current loop is a chip current loop inside the camera, comprising: a chip power supply inside the camera and a camera ground, the second current loop is used to The main control chip in the camera is powered by the chip power supply inside the camera, so that the main control chip can operate normally, and the current is returned to the camera through the camera ground to prevent the current in the second current loop from flowing back to the power ground, so that the first current loop and the second current loop flow back separately. The embodiment of the present invention can separate the power ground and the signal ground by changing the power supply of the camera to an isolated DC / DC switching converter. At this time, no matter how the power supply fluctuates, the camera ground will always be in a stable state. Therefore, the analog video signal is also in a stable transmission process, the image is displayed normally and no horizontal stripes are generated, thereby significantly improving the stability of long-distance transmission of the analog video signal.

[0016] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of an existing analog video signal transmission system provided by an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the structure of a long-distance stable transmission system for analog video signals provided by an embodiment of the present invention;

[0021] Figure 3A schematic diagram of the specific structure of a long-distance stable transmission system for analog video signals provided by an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of the structure of a server provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described in combination with the embodiments below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Currently, see Figure 1 The schematic diagram of the structure of an existing analog video signal transmission system is shown. When transmitting the video signal of the camera, the display host can be used to power the camera through a 12V power supply. The camera is connected to the display host through a single ground wire loop, so that the analog video signal of the camera is transmitted to the display host through the signal line, so that the display host then displays the image. However, when the scheme is transmitted over a long distance, the longer the transmission line is, the greater the internal resistance of the wire is. If the power consumption of the camera changes dynamically, the transmission current changes. According to Ohm's law, U=IR. At this time, there will be a changing potential difference between the two ends of the power ground transmission line. With respect to the reference ground, the transmission of the video signal will also be relatively superimposed on the changing ground signal, resulting in serious horizontal stripes on the camera, which seriously affects the video stability of the product. In addition, although by adding a video signal ground transmission line, the video signal can be transmitted with reference to the signal ground, the signal ground and the power ground are completely separated and transmitted without interfering with each other, thereby solving the problem of fluctuation of the analog signal reference ground, if a ground wire is simply added, the network of the two transmission ground wires is still the same, and the transmission impedance is only reduced to half of the original, which still cannot solve the existing technical problems.

[0025] Based on this, the analog video signal long-distance stable transmission system and server provided by the present invention can separate the power ground and the signal ground by changing the power supply of the camera to an isolated DC / DC switching converter. At this time, no matter how the power supply fluctuates, the camera ground will always be in a stable state. Therefore, the analog video signal is also in a stable transmission process, the image is displayed normally and no horizontal stripes are generated, which can significantly improve the stability of long-distance transmission of the analog video signal.

[0026] The embodiment of the present invention provides a structural schematic diagram of a long-distance stable transmission system for analog video signals, such as Figure 2As shown, the system includes: a camera, a display host, a first current loop and a second current loop, and the camera is connected to the display host through the first current loop and the second current loop.

[0027] Furthermore, the first current loop is a display host current loop, including: a 12V power supply and a power ground. The first current loop is used to power the camera end of the camera through the 12V power supply, and return the current to the display host through the power ground to avoid the current flowing back to the camera end. That is to say, the 12V power supply and the power ground form a current loop. The 12V power supply is mainly used to power the camera end. The power ground cannot flow back to the camera end and directly returns to the display host. If the power supply current fluctuates, it cannot affect the camera ground of the camera end, thereby preventing the video signal from being interfered with.

[0028] In addition, the second current loop is the chip current loop inside the camera, including: the chip power supply inside the camera and the camera ground. The second current loop is used to power the main control chip in the camera through the chip power supply inside the camera, so that the main control chip can operate normally, and return the current to the camera through the camera ground to avoid the current in the second current loop from flowing back to the power ground, so that the first current loop and the second current loop can flow back separately. That is to say, the chip power supply inside the camera and the camera ground form a current loop, which is mainly used to power the main control chip in the camera to ensure the normal operation of the chip. The camera ground also cannot flow back to the power ground. The two do not interfere with each other and flow back separately.

[0029] In addition, the system also includes: a third current loop; wherein the third current loop includes: a signal transmission circuit and a camera ground, and the third current loop is used to send the analog signal generated by the camera to the display host, that is, the analog video signal and the camera ground form a current loop, and at this time, the power supply transmission circuit and the signal transmission circuit are each a separate closed loop, so they will not affect each other. Thus, the stability of long-distance transmission of video signals is guaranteed.

[0030] Furthermore, the system also includes: an isolated DC / DC switching converter, which is arranged in the first current loop, wherein the isolated DC / DC switching converter is used to rectify the input current of the 12V power supply and input the rectified current to the camera end. Specifically, since the analog video signal is easily interfered by external signals, especially in the process of long-distance transmission, the image signal will be severely attenuated, the image quality will be significantly reduced, the color will become dim and seriously distorted, the greater the current fluctuation at the power supply end, the more serious the video signal will fluctuate under the superposition of the long internal resistance of the long-distance transmission line, causing more serious horizontal stripe interference in the analog camera. Therefore, an isolated DC / DC switching converter is added to the circuit board to divide the separate power ground loop into two ground loops that do not interfere with each other.

[0031] In one embodiment, see Figure 3 The specific structural diagram of a long-distance stable transmission system of an analog video signal is shown, and the camera includes: an image sensor, an image signal processor and a digital-to-analog conversion module, the image signal processor is connected to the image sensor, and the digital-to-analog conversion module is connected to the image signal processor.

[0032] The image sensor is used to convert the light input to the camera end into a first analog video signal, wherein the analog video signal is an electrical signal. The image sensor includes: an analog-to-digital converter, wherein the analog-to-digital converter is used to convert the first analog video signal from an electrical signal into a first digital video signal. That is to say, light enters the camera through a lens and first passes through a sensor (i.e., an image sensor). In the sensor, the light is converted into an electric charge and then converted into an analog electrical signal. The electrical signal is usually manifested as a voltage change. The light intensity value of each pixel corresponds to a voltage amplitude, forming an analog video signal, i.e., a first analog video signal. These analog video signals are converted into digital signals, i.e., a first digital video signal, through an ADC (i.e., an analog-to-digital converter) built into the image sensor.

[0033] The image signal processor is used to perform image optimization processing on the first digital video signal after the conversion of the first analog video signal to improve the image quality and determine the second digital video signal, wherein the image optimization processing includes: noise reduction processing, white balance processing, exposure compensation processing, color correction processing and sharpening and contrast adjustment processing, that is, the process is to convert the analog signal (brightness, color) of each pixel into a digital value. Once converted into a digital signal, the image is further post-processed and optimized by ISP (i.e., image signal processing), for example, noise reduction processing, white balance, exposure compensation, sharpening and contrast adjustment, color correction and other processing to improve the image quality, thereby obtaining the second digital video signal.

[0034] The digital-to-analog conversion module is used to convert the second digital video signal into a second analog video signal, so that the second analog video signal is transmitted to the display host through the signal transmission circuit. That is to say, the second digital video signal after the above processing is completed will be further converted into an analog signal (second analog video signal) by DAC (i.e., digital-to-analog conversion module), and the analog signal is transmitted to the display host via a coaxial cable or a twisted pair cable.

[0035] In one embodiment, the display host also includes: an analog-to-digital conversion module, a digital signal processor and a display screen, and the digital signal processor is connected to the analog-to-digital conversion module and the display screen respectively; wherein the analog-to-digital conversion module is used to receive a second analog video signal and convert the second analog video signal into a third digital video signal; the digital signal processor is used to perform digital filtering processing on the third digital video signal, determine the target video signal, and display the image corresponding to the target video signal through the display screen, that is, the second analog video signal is converted into a digital signal through the ADC (i.e., the analog-to-digital conversion module) in the display host, and then the image is further processed and optimized by the DSP (i.e., the digital signal processor) to obtain a third digital video signal, and finally the third digital video signal is output through the display host. This process clearly shows the entire dynamic process from signal capture, processing to final presentation, involving multiple signal processing and conversion links, ensuring that the signal can be accurately and clearly displayed to the user.

[0036] In summary, the present invention can add an isolated DC / DC switching converter with a transformer to the analog video circuit, and transmit the analog video using two ground wires, thereby separating power transmission from signal transmission, thereby ensuring long-distance and stable transmission of the analog video signal.

[0037] The device provided in the embodiment of the present invention has the same implementation principle and technical effects as those of the aforementioned method embodiment. For the sake of brief description, for matters not mentioned in the device embodiment, reference may be made to the corresponding contents in the aforementioned method embodiment.

[0038] An embodiment of the present invention provides a server. Specifically, the server includes a processor and a storage device. The storage device stores a computer program, and when the computer program is executed by the processor, it executes the method described in any one of the above-mentioned embodiments.

[0039] Figure 4 A structural diagram of a server provided in an embodiment of the present invention, the server 100 includes: a processor 40, a memory 41, a bus 42 and a communication interface 43, wherein the processor 40, the communication interface 43 and the memory 41 are connected via the bus 42; the processor 40 is used to execute an executable module stored in the memory 41, such as a computer program.

[0040] The memory 41 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk memory. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 43 (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may be used.

[0041] The bus 42 may be an ISA bus, a PCI bus, or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0042] Among them, the memory 41 is used to store programs, and the processor 40 executes the program after receiving the execution instruction. The method executed by the device for flow process definition disclosed in any embodiment of the above-mentioned embodiments of the present invention can be applied to the processor 40 or implemented by the processor 40.

[0043] The processor 40 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 40. The above processor 40 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present invention can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in the embodiment of the present invention can be directly embodied as a hardware decoding processor for execution, or a combination of hardware and software modules in the decoding processor for execution. The software module may be located in a storage medium mature in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 41, and the processor 40 reads the information in the memory 41 and completes the steps of the above method in combination with its hardware.

[0044] The computer program product of the readable storage medium provided in the embodiment of the present invention includes a computer-readable storage medium storing program code, and the instructions included in the program code can be used to execute the methods described in the previous method embodiments. The specific implementation can be referred to the previous method embodiments, which will not be repeated here.

[0045] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0046] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A long-distance stable transmission system for analog video signals, characterized in that: The system comprises: a camera, a display host, a first current loop and a second current loop, wherein the camera is connected to the display host via the first current loop and the second current loop; wherein, The first current loop is a display host current loop, including: a 12V power supply and a power ground, the first current loop is used to power the camera end of the camera through the 12V power supply, and return the current to the display host through the power ground to avoid current backflow to the camera end; The second current loop is the camera's internal chip current loop, including: a camera's internal chip power supply and a camera ground. The second current loop is used to power the main control chip in the camera through the camera's internal chip power supply to enable the main control chip to operate normally, and to return current to the camera through the camera ground to prevent the current in the second current loop from flowing back to the power supply ground, so that the first current loop and the second current loop can flow back respectively.

2. The analog video signal long-distance stable transmission system according to claim 1, characterized in that: The system further comprises: a third current loop; wherein, The third current loop includes: a signal transmission circuit and the camera ground, and the third current loop is used to send the analog signal generated by the camera to the display host.

3. The analog video signal long-distance stable transmission system according to claim 1, characterized in that: The system further includes: an isolated DC / DC switching converter, wherein the isolated DC / DC switching converter is arranged in the first current loop; wherein, The isolated DC / DC switching converter is used to rectify the input current of the 12V power supply and input the rectified current to the camera end.

4. The analog video signal long-distance stable transmission system according to claim 1, characterized in that: The camera comprises: an image sensor; wherein, The image sensor is used to convert the light input to the camera end into a first analog video signal, wherein the analog video signal is an electrical signal.

5. The analog video signal long-distance stable transmission system according to claim 4, characterized in that: The image sensor comprises: an analog-to-digital converter; wherein, The analog-to-digital converter is used to convert the first analog video signal from an electrical signal into a first digital video signal.

6. The analog video signal long-distance stable transmission system according to claim 4, characterized in that: The camera further comprises: an image signal processor, the image signal processor being connected to the image sensor; wherein, The image signal processor is used to perform image optimization processing on the first digital video signal converted from the first analog video signal to improve image quality and determine a second digital video signal, wherein the image optimization processing includes: noise reduction processing, white balance processing, exposure compensation processing, color correction processing, and sharpening and contrast adjustment processing.

7. The analog video signal long-distance stable transmission system according to claim 4, characterized in that: The camera further comprises: a digital-to-analog conversion module, which is connected to the image signal processor; wherein, The digital-to-analog conversion module is used to convert the second digital video signal into a second analog video signal, so that the second analog video signal is transmitted to the display host through the signal transmission circuit.

8. The analog video signal long-distance stable transmission system according to claim 1, characterized in that: The display host also includes: an analog-to-digital conversion module; wherein, The analog-to-digital conversion module is used to receive a second analog video signal and convert the second analog video signal into a third digital video signal.

9. The analog video signal long-distance stable transmission system according to claim 8, characterized in that: The display host further includes: a digital signal processor and a display screen, wherein the digital signal processor is connected to the analog-to-digital conversion module and the display screen respectively; wherein, The digital signal processor is used to perform digital filtering processing on the third digital video signal, determine the target video signal, and display an image corresponding to the target video signal through the display screen.

10. A server, characterized in that: The system comprises a processor and a memory, wherein the memory stores computer executable instructions that can be executed by the processor, and the processor executes the computer executable instructions to implement signal transmission in the system according to any one of claims 1 to 9.

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