Traditional digital video capture cards usually only have video capture capabilities, but not video processing. This paper introduces the design of a digital video capture card based on TI's C6000 series DSP chip. The card has autonomous digital video processing function and communicates with the host through the PCI interface. System composition As shown in Figure 1, the digital video capture card described in this paper consists of the following five parts: (1) High-speed video acquisition unit, which mainly completes the conversion of analog video signals to digital video signals; (2) The data exchange unit is composed of an FPGA and a dual-port RAM, and uses packet switching technology to complete the transmission of digital video data to the DSP; (3) DSP and its peripheral interface circuits, including EMIF interface, McBSP interface, HPI interface, PLL clock interface, DMA interface, JTAG interface, power monitoring, etc.; (4) The bridging unit of DSP and PCI bus mainly completes the communication between DSP and host computer; (5) The power supply section of the dual power supply mode. The design of each part of the system will be introduced separately below. System design implementation High-speed video acquisition unit Analog video signal is a kind of relatively complex analog signal. The signal contains the brightness information of the pixel, color synchronization information and line and field synchronization information. To achieve correct image acquisition, various signals must be correctly separated from the composite video signal, and the synchronization signal is used to control the A/D conversion process to achieve correct image acquisition. As shown in Figure 2, there are two implementations in hardware design: Figure 2 A/D sampling scheme (1) using a general-purpose A / D device + synchronous signal separation device; (2) A dedicated video A/D conversion chip is used. The implementation circuit of scheme 1 is more complicated. The design of this paper adopts the second scheme, and the conversion circuit is composed of PHILIP's video acquisition chip SAA7111. Data Exchange Unit In real-time video image processing systems, the throughput of data is large, and a large amount of video image data is collected, transmitted, and processed in real time. Therefore, in the system design, the data transmission design is very important. In the design of this system, a packet-switched data transmission method is realized by using FPGA and dual-port RAM, as shown in Fig. 3. Figure 3 FPGA and dual port RAM In the system, the FPGA must first complete the control of the A/D sampling, including controlling the start and stop of the sampling, the conversion of the sampling data format, etc. Secondly, the FPGA must complete the control of the double-port RAM data writing and the generation of the data transmission interrupt signal. In addition, the data path from A/D to dual-port RAM is formed in the FPGA, and some data pre-processing functions can be realized on this basis. In the dual-port RAM design, this article divides the entire dual-port RAM into two memory blocks. When one memory block is in the write operation, the other memory block is in the read operation, so that the data read and write operations are in different storage. Simultaneously on the block, the buffering of the data is realized, and the uninterrupted transmission of the data is realized. The block-switching transmission process of data is also the packing process of data. The size of the memory block determines the size of the data packet, and the packing of the data is beneficial to the whole processing of the data. Single Core Medium Voltage Cable
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Rated Voltage: 3.6/6kV to 26/35kV
Armour: Aluminum Wire Armored, Stainless Steel Wire Armored,
Operating temperature: Maximum 90°C, minimum bending 0°C
Certificates: Third party test reports
Applications: Those Medium Voltage Power Cables used for power networks,industrial plants, underground and in cable ducting.
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Figure 1 Block diagram of the acquisition card system 
Standard: IEC 60502