Patent ID: 8704952

Claim:
A video decoder comprising: a hue and saturation separator configured to demodulate from a component video signal chroma signal: a hue signal and a saturation signal; and a video signal determiner configured to determine at least one video signal characteristic of the component video signal dependent on the hue and saturation signal, wherein the video signal determiner comprises a mode determiner configured to determine an encoding standard of the video signal, wherein the mode determiner comprises: a signal lock detector configured to determine when a phase alternating line phase lock occurs between the hue signal and saturation signal; a sequence matcher configured to receive the video signal chroma signal and determine when a D b and D r sequence from the chroma signal match; and an encoding mode selector configured to output an encoding standard indicator dependent on the signal lock detector and sequence matcher, and wherein the encoding mode selector is configured to output an unknown encoding standard indicator when the signal lock detector fails to determine the hue signal and the saturation signal are phase locked and the sequence matcher fails to determine the D b and D r sequence from the chroma signal match.