Armored vehicle AVT camera signal transmission and acquisition circuit

Abstract

The utility model relates to the technical field of signal transmission and acquisition circuits, in particular to an armored vehicle AVT camera signal transmission and acquisition circuit, which comprises an AVT video signal acquisition filter module, an AVT video signal conversion module, a working mode configuration module and a power management module. The AVT video signal acquisition filtering module is in signal connection with the AVT video signal conversion module and is used for receiving an AVT video signal; the AVT video signal conversion module is in signal connection with the working mode configuration module, performs differential processing, and outputs video data through a twisted pair; the working mode configuration module is used for controlling the working mode configuration of the AVT video signal conversion module, the AVT digital video signals can be firstly filtered and impedance-matched through the modules, differential signals are adopted for transmission, the differential signals only need to be transmitted through twisted pairs, and the technical effect of greatly reducing the cost is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of signal transmission and acquisition circuits, in particular to a signal transmission and acquisition circuit for an armored vehicle AVT camera. Background Art

[0002] At present, the digital high-definition cameras used in armored vehicles basically adopt the SDI video transmission format. SDI transmits high-frequency modulated signals. High-frequency signals have very high requirements for wire shielding, so the use of coaxial cable transmission can theoretically reach 100 meters, but the premise is that the wire quality must be good and the joints must be well welded.

[0003] If poor wires or wires from old systems are used, the actual transmission distance cannot reach 100 meters due to connector oxidation and wire aging problems, and some can only reach about 30-50 meters. Some manufacturers are also making technical improvements for HD-SDI transmission, striving to reach 200-300 meters, but this will also cause compatibility; and the impedance of coaxial cable is seriously affected by temperature. Related supporting equipment is incomplete (small scale), there are few complete solutions, and the cost of building large systems is high: HD is only meaningful when it includes overall solutions such as front-end, transmission, browsing, display, platform, and storage. However, the current supporting equipment is small in scale, the full set of HD-SDI is expensive, and the quality of products from various manufacturers is uneven due to their immaturity.

[0004] With the continuous development of electronic technology, more and more armored vehicles have begun to be equipped with driver auxiliary observation devices as standard. The auxiliary observation system is used to assist the driver in driving observation of the near and far surroundings of the vehicle during normal training or drills. At present, auxiliary observation cameras mostly use SDI uncompressed digital video signals with a resolution of 1080P@30Hz. The video signal must be transmitted using coaxial cables, but its acquisition and transmission stability is poor, the price is high, and the temperature signal attenuation is large. It is easy to be interfered and cannot meet the requirements of localization. However, the requirements for localization of supporting equipment for military armored vehicles are getting higher and higher, and even require 100% localization of electronic components. Utility Model Content

[0005] In view of the above problems, the utility model provides an armored vehicle AVT camera signal transmission and acquisition circuit.

[0006] The adopted technical solution is, an armored vehicle AVT camera signal transmission and acquisition circuit, including an AVT video signal acquisition and filtering module, an AVT video signal conversion module, a working mode configuration module and a power management module;

[0007] The AVT video signal acquisition and filtering module is signal-connected to the AVT video signal conversion module and is used to receive the AVT video signal;

[0008] The AVT video signal conversion module is connected to the working mode configuration module signal, and performs differential processing to output video data through a twisted pair cable;

[0009] The working mode configuration module is used to control the working mode configuration of the AVT video signal conversion module;

[0010] The power management module is respectively connected to the AVT video signal acquisition and filtering module, the AVT video signal conversion module and the working mode configuration module, and supplies power.

[0011] Optionally, a filtering circuit and an impedance matching circuit are provided in the AVT video signal acquisition filtering module;

[0012] The filter circuit includes a resistor, a capacitor and an inductor, and performs filtering processing on the input AVT video signal;

[0013] The impedance matching circuit includes a resistor, a capacitor and an inductor, and performs impedance matching on the input AVT video signal.

[0014] Optionally, the AVT video signal conversion module converts the AVT video signal into BT1120, BT656, or RGB image data signals.

[0015] Optionally, the AVT video signal conversion module is provided with a NS2521 video signal receiving chip, and the operating crystal frequency of the NS2521 chip is 27 MHz, and pins 63 and 62 of the NS2521 chip are a group, and pins 51 and 52 are a group to form a differential signal circuit transmission.

[0016] Optionally, the working mode configuration module includes a W25Q40 Flash memory, and the W25Q40 Flash memory communicates with the NS2521 chip via an SPI bus.

[0017] Optionally, the power management module is provided with an SD8906A chip circuit and an SGM2019-3.3YN5G chip circuit, and the power management module converts the DC5V voltage into two voltages, DC3.3V and DC1.2V, to power the NS2521 chip and the AVT video signal conversion module respectively.

[0018] Optionally, the resolutions of received AVT video signals include HD 720p 4 / 25 / 30 / 50 / 60; HD 1080p12 / 12.5 / 15 / 24 / 25 / 30.

[0019] The beneficial effects of the present utility model include at least one of the following:

[0020] 1. By setting up an armored vehicle AVT camera signal transmission and acquisition circuit including an AVT video signal acquisition and filtering module, an AVT video signal conversion module, a working mode configuration module and a power management module, the AVT digital video signal can be filtered and impedance matched first, and then transmitted using a differential signal. The differential signal only needs to be transmitted using a twisted pair cable, which greatly reduces the cost.

[0021] 2. At the same time, the electronic components in each module can be made of domestic general components to achieve 100% localization, reduce the risk of component procurement, and reduce dependence on imported components, and improve the supply guarantee of pressure sensors.

[0022] 3. After differential processing, the use of twisted pair for signal transmission has the characteristics of extremely low cost, long transmission distance, good temperature characteristics, strong anti-interference ability, and the characteristic impedance is minimally affected by temperature.

[0023] 4. The NS2521 chip and its associated circuits can support the three image data signal interface requirements of BT1120, BT656 and RGB. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is the circuit diagram of the AVT video signal acquisition and filtering module;

[0025] Figure 2 This is the circuit diagram of the AVT video signal conversion module;

[0026] Figure 3 This is the circuit diagram of the SGM2019-3.3YN5G chip;

[0027] Figure 4 This is the circuit diagram of the SD8906A chip;

[0028] Figure 5 This is the circuit diagram of W25Q40 Flash memory;

[0029] Figure 6 Provide a connection diagram for each module; DETAILED DESCRIPTION

[0030] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0031] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0032] like Figure 6 As shown, an armored vehicle AVT camera signal transmission and acquisition circuit includes an AVT video signal acquisition and filtering module, an AVT video signal conversion module, a working mode configuration module and a power management module;

[0033] The AVT video signal acquisition and filtering module is signal-connected to the AVT video signal conversion module and is used to receive the AVT video signal;

[0034] The AVT video signal conversion module is connected to the working mode configuration module signal, and performs differential processing to output video data through a twisted pair cable;

[0035] The working mode configuration module is used to control the working mode configuration of the AVT video signal conversion module;

[0036] The power management module is respectively connected to the AVT video signal acquisition and filtering module, the AVT video signal conversion module and the working mode configuration module, and supplies power.

[0037] The purpose of this design is to set up an armored vehicle AVT camera signal transmission and acquisition circuit that includes an AVT video signal acquisition and filtering module, an AVT video signal conversion module, a working mode configuration module, and a power management module. The AVT digital video signal can be filtered and impedance matched first, and then transmitted using a differential signal. The differential signal only needs to be transmitted using a twisted pair cable, which greatly reduces costs.

[0038] At the same time, in this embodiment, Figure 1 As shown, a specific structure of an AVT video signal acquisition and filtering module is also provided, wherein a filtering circuit and an impedance matching circuit are arranged in the AVT video signal acquisition and filtering module;

[0039] The filter circuit includes a resistor, a capacitor and an inductor, and performs filtering processing on the input AVT video signal;

[0040] The impedance matching circuit includes a resistor, a capacitor and an inductor, and performs impedance matching on the input AVT video signal.

[0041] The purpose of this design is that the AVT video signal acquisition and filtering module filters and impedance matches the AVT digital video signal; by changing the values ​​of resistors R1~R9, capacitors C1~C6, and inductors L1~L4, it can match AVT video signal inputs of various resolutions (including: HD 720p 4 / 25 / 30 / 50 / 60; HD 1080p12 / 12.5 / 15 / 24 / 25 / 30) as well as impedance matching and filtering processing.

[0042] like Figure 2 As shown, in this embodiment, a specific structure of an AVT video signal conversion module is also provided, wherein the AVT video signal conversion module converts the AVT video signal into BT1120, BT656, and RGB image data signals, and an NS2521 video signal receiving chip is arranged in the AVT video signal conversion module, and the working crystal oscillator frequency of the NS2521 chip is 27 MHz, and pins 63 and 62 of the NS2521 chip are a group, and pins 51 and 52 are a group to form a differential signal circuit transmission.

[0043] It should be pointed out that this module circuit is mainly realized by the domestic NS2521 video signal receiving chip. This circuit is used to convert the AVT digital video signal into BT1120, BT656, and RGB image data signals. The operating crystal frequency of the NS2521 chip is 27MHz; it supports two-way video signal input, and this video signal is transmitted using differential signals, in which pin 63 and pin 62 are a group; pin 51 and pin 52 are a group.

[0044] The NS2521 chip supports both IIC and SPI mode control functions, and is used to configure the working mode of the video signal conversion module, converting it into one of the three image data signals: BT1120, BT656, and RGB.

[0045] like Figure 3 and Figure 4 As shown, in this embodiment, a specific composition of a power management module is also provided, wherein an SD8906A chip circuit and an SGM2019-3.3YN5G chip circuit are arranged in the power management module, and the power management module converts the DC5V voltage into two voltages of DC3.3V and DC1.2V, which are used to power the NS2521 chip and the AVT video signal conversion module respectively.

[0046] like Figure 5As shown, in this embodiment, a specific composition of a working mode configuration module is also provided, wherein the working mode configuration module includes a W25Q40 Flash memory, and the W25Q40 Flash memory communicates with the NS2521 chip via SPI bus to guide its working mode, and converts the AVT video signal into one of the three image data signals of BT1120, BT656, and RGB.

[0047] It should be pointed out that the armored vehicle AVT camera signal transmission and acquisition circuit provided in this embodiment realizes the filtering processing and impedance equivalent matching of the AVT chip through the front-end AVT video signal acquisition filter module circuit. The differential video signal processed by the filtering and impedance matching circuit is transmitted to the video input port of the AVT video signal conversion module circuit. The mode configuration circuit is used to configure the working mode of the AVT video signal conversion module circuit. When the AVT video signal conversion module circuit works in different modes, it will convert the AVT digital differential signal frequency signal into image data signals of different formats for use by the subsequent stage. The power supply module circuit provides power distribution management for this circuit. The input voltage of the entire circuit is DC5V. The DC-DC direct current conversion chip and the LDO linear voltage regulator chip are used to perform voltage reduction processing to provide a stable and reliable power supply for this circuit, ensuring the normal operation of the entire system.

[0048] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An armored vehicle AVT camera signal transmission and acquisition circuit, characterized in that: It includes an AVT video signal acquisition and filtering module, an AVT video signal conversion module, a working mode configuration module and a power management module; The AVT video signal acquisition and filtering module is signal-connected to the AVT video signal conversion module and is used to receive the AVT video signal; The AVT video signal conversion module is connected to the working mode configuration module signal, and performs differential processing to output video data through a twisted pair cable; The working mode configuration module is used to control the working mode configuration of the AVT video signal conversion module; The power management module is respectively connected to the AVT video signal acquisition and filtering module, the AVT video signal conversion module and the working mode configuration module, and supplies power.

2. The armored vehicle AVT camera signal transmission and acquisition circuit according to claim 1 is characterized in that: The AVT video signal acquisition and filtering module is provided with a filtering circuit and an impedance matching circuit; The filter circuit includes a resistor, a capacitor and an inductor, and performs filtering processing on the input AVT video signal; The impedance matching circuit includes a resistor, a capacitor and an inductor, and performs impedance matching on the input AVT video signal.

3. The armored vehicle AVT camera signal transmission and acquisition circuit according to claim 1 is characterized in that: The AVT video signal conversion module converts the AVT video signal into BT1120, BT656, and RGB image data signals.

4. The armored vehicle AVT camera signal transmission and acquisition circuit according to claim 3 is characterized in that: The AVT video signal conversion module is provided with a NS2521 video signal receiving chip, and the operating crystal frequency of the NS2521 chip is 27 MHz, and pins 63 and 62 of the NS2521 chip are a group, and pins 51 and 52 are a group to form a differential signal circuit transmission.

5. The armored vehicle AVT camera signal transmission and acquisition circuit according to claim 4 is characterized in that: The working mode configuration module includes a W25Q40 Flash memory, and the W25Q40 Flash memory communicates with the NS2521 chip via SPI bus.

6. The armored vehicle AVT camera signal transmission and acquisition circuit according to claim 5, characterized in that: The power management module is provided with an SD8906A chip circuit and an SGM2019-3.3YN5G chip circuit, and the power management module converts the DC5V voltage into two voltages, DC3.3V and DC1.2V, which respectively power the NS2521 chip and the AVT video signal conversion module.

7. An armored vehicle AVT camera signal transmission and acquisition circuit according to any one of claims 1 to 6, characterized in that: The resolution of the received AVT video signal includes HD 720p4 / 25 / 30 / 50 / 60; HD 1080p12 / 12.5 / 15 / 24 / 25 / 30.

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