LONDON National Semiconductor Corporation will demonstrate at next week’s International Broadcasting Convention in Amsterdam, the Netherlands, a decoder with an integrated 2:1 multiplexing (MUX) video switch that uses analogue technology to accurately convert standard and high-definition video (YPbPr) signals to a computer video (RGB) format.
National claims the decoder, an industry first, increases compatibility between different video standards and formats, allowing consumers to output video directly from DVD players, gaming devices and other devices to their personal computer monitors.
Dubbed the LMH1251 and just started sampling, the part also performs all the necessary sync processing to generate horizontal and vertical sync signals from standard (SD) and high-definition (HD) video formats.
"Converting signals in the analogue domain through National's integrated, all-in-one decoder gets rid of all the complex external circuitry or additional chips you'd find in a digital solution," said Erroll Dietz, vice president of National Semiconductor's Amplifier products group. "Instead, it offers manufacturers an easy way to add component video compatibility without the headaches and errors of current solutions."
The 1251's conversion process is done using analogue technology via a color-space conversion matrix, eliminating multiple stages of digital implementations. The result is a cleaner, crisper, decoded video image that is superior to alternative approaches that use discrete components, digital products or FPGAs.
National says that while discrete solutions require design expertise, use more board space, consume more power and have inferior decoding quality, a digital approach, for instance with FPGAs, is typically more expensive and offers more features than may be needed in a system.
It says the analogue design of the LMH1251 ‘reduces undesired artifacts and provides a smaller form factor for easy integration.’