Patent attributes
In a circuit, a wobble detector detects a wobble signal from an optical recording medium and a synchronization signal based on the wobble signal and provides a wobble clock signal. A wobble signal phase imperfection detector responds to the wobble signal and detects and corrects a phase transition imperfection in the wobble signal. The imperfection detector integrates a first scaled wobble signal sample over a half period portion of the wobble clock signal; compares the first scaled wobble signal sample integrated over one period of the wobble clock signal to a variable threshold value; and based on the comparison, outputs either the half period integrated and scaled wobble sample or the first scaled wobble sample integrated over one period of the wobble clock signal. The imperfection detector further decodes the output to obtain wobble address period data. In one embodiment, the imperfection detector may include a half period integrator, a comparator, a selector, and a decoder to perform the indicated functions.
