Patent ID: 9159355
Filing Date: 2015-10-13
Classification: G11B

Abstract:
1. A method comprising: adjusting, based on a previously-integrated portion of a wobble signal, a minimum or a maximum signal threshold configured to enable integration of subsequently received portions of the wobble signal; receiving, subsequent to adjusting the minimum or the maximum signal threshold, another portion of the wobble signal from an optical head; integrating, when the adjusted minimum or the adjusted maximum signal threshold is exceeded, the other portion of the wobble signal to produce another integrated portion of the wobble signal; filtering, via a low-pass filter, the other integrated portion of the wobble signal to determine an offset for the other integrated portion of the wobble signal; removing, subsequent to integrating the other portion of the wobble signal, the offset from the other integrated portion of the wobble signal to produce a non-offset integrated portion of the wobble signal; detecting a header within the non-offset integrated portion of the wobble signal based on the non-offset integrated portion of the wobble signal and a header-detection threshold; and determining that data in a sector associated with the header is stored within a land track or groove track based on a direction of a transition of the header.