Patent ID: 7978579
Filing Date: 2011-07-12
Classification: G11B

Abstract:
1. A circuit, comprising: a wobble detector to detect a wobble signal and to provide a wobble clock signal; a wobble signal phase imperfection detector, responsive to the wobble signal and the wobble clock signal, to detect and correct a phase transition imperfection in the wobble signal, said wobble signal phase imperfection detector comprising: a comparator to compare a variable threshold value to an absolute value of a first scaled wobble signal sample integrated over substantially one period of the wobble clock signal; an integrator to integrate the first scaled wobble signal sample over substantially a half-period portion of the wobble clock signal, wherein said substantially a half-period portion of the wobble clock signal is substantially a first half period portion of the wobble clock signal or substantially a second half period portion of the wobble clock signal, based on a phase transition comparison of a difference between absolute values of first and second consecutive integrated and scaled wobble signal samples and the variable threshold value; and a selector, responsive to the comparison, to select as an output either the first scaled wobble signal sample integrated over the substantially one period of the wobble clock signal or the half period scaled and integrated wobble signal sample.