Adaptive PID controller for audio/video clock recovery
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United States of America Patent
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Aug 11, 2015
Grant Date -
Oct 24, 2013
app pub date -
Sep 27, 2011
filing date -
Sep 27, 2011
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Abstract
Systems, devices and methods are described including specifying a jitter response control parameter, receiving multiple timestamp pairs. A maximum jitter of the timestamp pairs may be determined along with an elapsed time, and a clock frequency may be adjusted if the maximum jitter is less than the elapsed time divided by the jitter response control parameter. The jitter response control parameter may be adjusted in response to changes in die jitter of the input A/V signal. Further, one or more Proportional-Integral-Derivative (PID) controller coefficients may be adjusted in response to the evaluated jitter of the timestamp pairs.
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