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As video and computers move closer together, there is a greater need for the interface between video signals and computer signals to be compatible. This interface is actually at two levels. One is the hardware level where the two systems interconnect. The levels and timing must be compatible. The other is at the information level. The picture presented to the computer must be stable. Traditional video decoders synchronize the incoming video stream by adjusting the system clock using a method of phase lock loops. While this works fine in consumer televisions, the lack of stability in the system clock and the output image can complicate the interface. For this reason, a non-traditional method of digital video decoding provides the best solution for computer applications. An all digital method of synchronization to bridge this gap between traditional video technology and emerging computer technology is discussed. The method has been incorporated in what is called Ultralock and placed in Brooktree's all digital decoder, the Bt812. The Bt812 is the first single chip all digital video decoder available on the market. With this component, the goal has been reached of an easy to use digital video decoder. |
