By PURPLELEC | 13 June 2024 | 0 Comments
USB 3.0 video capture card improves transmission rate
USB video capture card, with the increase of notebook users, its application is very wide, such as video surveillance, video conferencing, online live broadcast, teaching, etc. have begun to widely use USB video capture card. Due to the limitation of USB interface, it cannot achieve high definition in video transmission, or frame loss occurs.
USB has the advantages of high speed, low cost, low power consumption, plug and play and easy use and maintenance. It has not only become a standard interface on PC motherboard, but also one of the standard protocols for all PC external devices such as keyboard, mouse, monitor, printer, digital camera, etc. connected to PC, and quickly occupied the market of medium and low-speed external devices in computers. Due to its functional requirements, the video capture card needs to be connected to the computer. For example, the built-in video capture card needs to be inserted into the motherboard, which is very inconvenient for users such as notebooks. The introduction of USB video capture card has greatly solved the problem of industry demand. Directly connecting to the USB interface can meet the requirements.
At present, USB3.0 technology has been launched and has been applied in some products. USB 3.0 has backward compatibility standards and combines the ease of use and plug and play functions of traditional USB technology. The goal of this technology is to launch products that are more than 10 times faster than the current connection level, using the same architecture as wired USB. In addition to optimizing the USB 3.0 specification to achieve lower energy consumption and higher protocol efficiency, USB 3.0 ports and cables can achieve backward compatibility and support future fiber optic transmission.
USB3.0 can be said to bring great changes to the entire computer industry, because it is hardware. "Logically, USB 3.0 will become the next generation of the most popular wired interconnection method for personal computers," said Jeff Ravencraft, Intel's technology strategist. "The digital age requires high-speed performance and reliable interconnection to achieve the transmission of huge amounts of data in daily life. USB 3.0 can meet this challenge well and continue to provide the USB ease-of-use experience that users are accustomed to and continue to expect."
Compared with the USB2.0 standard, USB3.0 has a faster transmission rate, supports a wider range of operating systems, and is more comprehensive. In particular, the actual transmission rate of the new ultra-high-speed interface is about 3.2Gbps (ie 400MB/S). The theoretical maximum rate is 5.0Gbps (ie 625MB/S). Similarly, USB 3.0 also cannot reach the theoretical value of 5.0Gb. If it can only reach 50% of the theoretical value, it is close to 10 times that of USB 2.0. The physical layer of USB3.0 adopts 8b/10b encoding, so the theoretical speed is only 4Gb/s. The actual speed needs to deduct the protocol overhead, which is a little less than 4Gb/s.
As a domestic USB video capture card R&D and production company, Purplelec launched VS061 external USB audio and video capture card and VS028 external USB audio and video capture card under USB2.0 standard, which can capture video signals in real time at high speed. In particular, VS028 external USB video capture card comes with a complete SDK development package, supports secondary development, and supports Windows 2000, Windows 2003, XP, Vista, WIN7 and other operating systems.
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