Allegro DVT, a leading digital video compliance test suite, H.264 intellectual property (IP) and digital broadcasting technology provider based in Silicon Valley, France, is optimistic about the Chinese video processing chip market, and in recent years has increased its domestic related chip manufacturers. Cooperation and support in the Chinese market. Its digital video compliance test suite and H.264 MPEG-4 AVC / MVC encoder IP have been adopted and paid attention to by domestic first-class chip manufacturers such as HiSilicon, Spreadtrum and Hangzhou Guoxin. product.
Allegro DVT's video encoder IP is hardware IP, which can provide RTL source code, C control software, bit-accurate reference model and related documents. They are specifically designed for SoCs used in smartphones, digital cameras, wireless display devices, set-top boxes, digital cameras and security systems. With the help of Allegro DVT's advantages in digital image broadcasting, video testing and video codec, the company has adopted a unique algorithm and chip architecture to develop the industry's leading H.264 / MPEG4 encoder IP.
"Our broadcast-grade H.264 compression algorithm, coupled with a unique hardware architecture brings the best video quality, the smallest area, the smallest power consumption, the smallest memory bandwidth and the smallest delay, and can be quickly and easily Integrated into SoC. "Allegro DVT co-founder and CEO Pierre Marty told Huaxing Wanbang chief analyst Liu Zhaohui. "Our video encoding IP has been licensed to many customers, including one of the top ten semiconductor companies in the world, and has been verified by streaming. In our global customer base, Asian customers, including mainland China, account for approximately 40%. "
The company's coding technology covers H.264 / AVC basic format, mainstream format and high-end format, as well as H.264 / MVC stereo high-end format (with 3D capabilities). The motion estimation algorithm can be optimized according to the memory bandwidth of the SoC and the requirements of consumer chips; it can encode any video resolution up to the high-definition format, and can perform multi-channel encoding. It can be easily and quickly integrated in a variety of SoC designs. Its hardware structure minimizes the number of gates and power consumption. It also has the lowest support requirements for SoC embedded processors.
Allegro DVT was established in November 2003. By focusing on the development of various video and audio digital compression technologies, it has become the world's leading provider of digital video processing technology streams. At present, Allegro DVT has developed three product lines including various compliance test kits, chip design intellectual property (IP) and broadcast products. More than 70 of its customers are world-class manufacturers, including chip manufacturers such as Intel, NXP, TI, ST and Broadcom, operators such as NTT and equipment manufacturers such as Siemens and Fujitsu.
In China, Allegro DVT has received extensive attention and adoption of its H.264 video encoding IP through continuous sponsorship and participation in many chip design industry activities.
Mr. Pierre Marty, co-founder and CEO of Allegro DVT
The story of Ethernet began in the ALOHA period. The exact time was after a student named Bob Metcalfe received a bachelor's degree from the Massachusetts Institute of Technology and moved to Harvard University across the river to pursue a PhD. During his studies, he came into contact with Abramson's work, and he was very interested in it. After graduating from Harvard, he decided to stay in Hawaii for vacation before going to Xerox Palo Alto Research Center to work in order to help Abramson work. When he arrived at the Palo Alto Research Center, he saw that researchers there had designed and built machines that would later be called personal computers, but these machines were solitary; he used the knowledge he gained to help Abramson work with his colleague David Boggs designed and implemented the first local area network. The local area network uses a long thick coaxial cable and runs at a rate of 3Mbps.
They named this system Ethernet, and people once thought that electromagnetic radiation could be transmitted through it.
Shared medium
The Carrier Sense Multiple Access (CSMA/CD) technology with collision detection specifies a method for multiple computers to share a channel. This technology first appeared in the ALOHAnet developed by the University of Hawaii in the 1960s, which uses radio waves as a carrier. This method is simpler than token ring network or main control network. When a computer wants to send information, it switches between the following actions and states:
Start-If the line is idle, start the transmission, otherwise skip to step 4.
Send-If a conflict is detected, continue to send data until the min echo receive interval is reached to ensure that all other transponders and terminals detect the conflict, and then skip to step 4.
Successful transmission-report to the higher-level network protocol that the transmission was successful, and exit the transmission mode.
Line is busy-keep waiting until the line is free.
Line is idle-before reaching the maximum number of attempts, go to step 1 to try again at random intervals.
Exceeded the maximum number of transmission attempts-report the transmission failure to the higher layer network protocol, and exit the transmission mode.
Because all communication signals are transmitted on the shared line, even if the information is only sent to one of the terminals (destination), it will be sent to all computers on the line in the form of broadcast. Under normal circumstances, the network interface card will filter out the information that is not sent to itself, and will send an interrupt request to the CPU when it receives the information whose destination address is its own, unless the network card is in Promiscuous mode. This "one talk, everyone listen" characteristic is the security weakness of the shared medium Ethernet, because a node on the Ethernet can choose whether to listen to all the information transmitted on the line. Sharing cables also means sharing bandwidth, so in some cases the speed of Ethernet may be very slow, such as after a power failure, when all network terminals are restarted.
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