Position:What frequency conference system transmits is multimedia data, the data bulk of the source signal of sound and dynamic image is greater, cannot transmit on the digital circuitry of general requirement. In the meantime, be based on the requirement to using the effect actually, ask transmission sound, picture signal is successive and flowing, other and auxiliary function is used easily. Accordingly, be in to the system sound / image is compressed, communication circuitry condition, data / applied process is shared wait for a respect to very high technology asks. Article general from at present the respect such as standard of technology of the main technique of video conference, solution and prospective technology trend, network undertakes discussing, the hope provides reference for the personnel of research and development of this domain.
The crucial technology of video conference system
1) technology of multimedia information processing
Technology of multimedia information processing basically is to be aimed at all sorts of media information to undertake compress and be handlinged. The development process of video conference also reflects an information processing skill especially the development course that video compresses a technology. At present new theory, algorithm advances the development of technology of multimedia information processing ceaselessly, promoting the development of video conference technology then. It is especially below the condition with network not rich bandwidth, multimedia information compresses a technology to already became one of issues with video the most crucial conference.
With the CPU technology that is based on a PC, be based on photograph of technique of special chip set to compare, because media processor has peculiar number to inspect frequency to input coprocessor of output interface, multimedia to wait make application becomes more simple, and the adjustment that equipment manufacturer can undertake software applies at any time according to vicissitude of the market, get used to market demand in time, and won't the technology of itself of special chip set restricts be enslaved to be enslaved to. What media processor supports is embedded operating system and software are optimized, make video conference system more efficient, stable, reliable. Media processor technology has made the core chip technology of video conference in fact, still can inspect the service the terminal product such as the mobile phone at 3G in the future.
In video conference system, current media processor basically has: The C6X of company of the TriMedia series of Philip company and the ADSP2106X parts of an apparatus that taste company of the LVP of company of ESS of PNX1500, United States, ADI newly and Blackfin processor, TI, C8X and new the DM642 multimedia that roll out DSP chip, ability of these operation of media processor high-speed can realize the terminal of video conference communication that suits different agreement. It is OK to use these chips very realize MPEG video and frequency processing, H.263 video processing conveniently, the multimedia application that still can realize other if TV of box of top of machine of DVD, number, number.
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