Video System Sampling Phase Determination

A method comprising:

• comparing differences of successive pixel values to a threshold for each of a plurality of phases of a sampling clock that is used to sample a video signal to generate the successive pixel values;
• counting a number of times the threshold is exceeded at each of the plurality of phases to create a phase profile;
• adaptively modifying the threshold based on the phase profile;
• and
• selecting a phase from the plurality of phases to sample the video signal.

An apparatus comprising:

• an analog-to-digital converter to sample an analog video signal and to generate pixel values for each of a plurality of phase values of a sampling clock;
• a first component to determine differences of successive pixel values;
• a second component to compare the differences of successive pixel values to a threshold;
• a third component to count the number of times the threshold is exceeded for each of the plurality of phases to create a phase profile;
• a threshold modification component to modify the threshold in response to the phase profile;
• and
• a phase selection component to select a sampling phase in response to the phase profile.

An electronic system comprising:

• a display device to accept pixel values and to display a corresponding image;
• an analog-to-digital converter to accept an analog video signal and to generate the pixel values;
• and
• a sampling clock phase determination component to determine a phase for a sampling clock to drive the analog-to-digital converter, the sampling clock phase determination component including a circuit to compare successive pixel values to a dynamic threshold.