Abstract: An apparatus for processing a digitized analog signal read from a DVD media and provided to a digital processing system is described herein. The apparatus includes a DVD reading apparatus for providing a signal comprised of a stream of actual data read from a DVD media; and a processor for determining, based upon the comparison of actual data to the known ideal contents of the data on said DVD media, the magnitude of no more than two variables representing at least three coefficients in an impulse response equation which models the digital processing system. The magnitude of the two variables are determined by the processor so that the error rate between the first and second sets of data is minimized.