Asymmetry compensation system

A method of asymmetry compensation, comprising:

• adding, with an adder, data read from an optical disk with an offset signal;
• converting an analog adjusted replay signal to a digital adjusted digital replay signal, the analog adjusted replay signal being based, at least in part, on an output of the adder;
• and
• sending the digital adjusted replay signal to a nonlinear element and feeding back the digital adjusted replay signal to an envelope detector;
• nonlinearly processing, with the nonlinear element, the digital adjusted replay signal with a scaling factor to generate a compensated signal that is compensated for asymmetry;
• generating, with the envelope detector, the offset signal based on the digital adjusted replay signal;
• sending, with the envelope detector, the offset signal back to the adder;
• and
• estimating the scaling factor based on the compensated signal and a scaling factor gain, wherein the scaling factor is configured to compensate for asymmetry in the digital adjusted replay signal.

An asymmetry compensation system, comprising:

• a nonlinear element configured to:
• receive an adjusted replay signal comprising data read from an optical disk that is adjusted, at least in part, by an offset signal;
• and
• nonlinearly process the adjusted replay signal with a scaling factor to generate a compensated signal that is at least partly compensated for asymmetry;
• scaling factor estimation logic configured to estimate the scaling factor based on the compensated signal and a scaling factor gain, wherein the scaling factor is configured to compensate for asymmetry in the adjusted replay signal;
• an adder configured to add the data read from the optical disk with the offset signal, the adjusted replay signal being based, at least in part, on the data being added with the offset signal;
• and
• an envelope detector configured in a feedback loop, the envelope detector configured to:
• receive the adjusted replay signal;
• generate the offset signal based on the adjusted replay signal;
• and
• send the offset signal to the adder,
• wherein the compensated signal comprises one of:
• the scaling factor multiplied by a square of an amplitude of the adjusted replay signal added to the amplitude of the adjusted replay signal;
• or
• the scaling factor multiplied by an absolute value of an amplitude of the adjusted replay signal added to the amplitude of the adjusted replay signal.