Patent ID: 7724635
Filing Date: 2010-05-25
Classification: G11B

Abstract:
1. A recording medium playing device comprising: a frame counter for providing an alignment point set in response to received EFM input data and counting pulses of a channel clock signal to generate a predetermined demodulation point of a frame counter; an input capture part for serially receiving the EFM input data and storing the EFM data in parallel; an EFM demodulation table in signal communication with the frame counter and the input capture part for outputting EFM demodulation data corresponding to the parallel data in response to the demodulation point; and a forward/backward jumping block in signal communication with the frame counter and the EFM demodulation table for adaptively aligning the demodulation point with the channel clock signal according to a result of comparison of the alignment point with the demodulation point, wherein the alignment point is set whenever the value of the frame counter is a multiple of 14 when the EFM input data is an EFM signal or a multiple of 16 when the EFM input data is an EFM+ signal, and wherein the jumped demodulation point corrects a random misalignment by an integer number of channel clock pulses between the frame counter responsive to the EFM input data and the channel clock signal to substantially prevent erroneous demodulation.