Fujitsu Microelectronics Europe is working closely with XSYS Interactive Research of Villingen, Germany, on the implementation of Fujitsu's MPEG-2 encoder in a sophisticated in-car digital video and data distribution system. Unlike previous-generation analog systems which were based on copper coaxial cabling, XSYS is developing highly advanced video and data processing for this application that allows the transmission via a digital bus based on plastic optical fibre.
According to Fujitsu, its MB86390 MPEG-2 encoder is one of the industry's first single-chip solutions for MPEG-2 encoding, including all three key functional elements; video, audio and system multiplexing, in a single IC. An embedded Fujitsu SPARClite CPU controls the complete encoding and multiplexing process. Implementation within a single-chip enables costs to be minimised, thus allowing the device to meet the particularly cost-sensitive demands of in-car systems.
XSYS says the MPEG-2 encoder has been proven to have exceptionally stable performance in the demanding environmental conditions prevalent within the car, being especially robust against analog 'noise' to which MPEG image compression techniques are normally susceptible. The reason for that is the use of smart and sophisticated coding algorithms. A typical in-car video distribution system, using the MB86390, would consist of TV tuner, MPEG-2 encoder and LCD displays with built-in MPEG decoders.
In order to achieve the typical 320 pixels by 240 lines resolution of LCD displays in such a system with a progressive frame format, the company says that it has been shown that a bit-rate of approximately 5 Mbps is sufficient, even with noisy TV signals. In less noisy applications, such as those with in-car cameras as the signal source, the bit rate can be reduced to about 1,5 Mbps.
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