Supplementary timing recovery

A method for signal processing, comprising:

• receiving an analog input signal corresponding to data stored in a non-transitory computer readable medium;
• sampling the analog input signal and converting the sampled analog input signal into a digital output signal based on a sampling clock signal;
• equalizing the digital output signal;
• generating a first timing error signal based on the digital output signal;
• adjusting the sampling clock signal based on the first timing error to compensate for the first timing error;
• generating a second timing error based on the equalized digital output signal;
• and
• phase-shifting the equalized digital output signal based on the second timing error.

An apparatus for reading a non-transitory optical medium, comprising:

• an optical pick-up unit configured to generate a data signal corresponding to data stored on the non-transitory optical medium;
• an analog signal processing path to generate an analog input signal based on the data signal;
• an analog to digital converter (ADC) configured to receive the analog input signal, sample the analog input signal based on a sampling clock signal, and convert the sampled analog input signal into a digital output signal;
• an equalizer configured to equalize the digital output signal;
• a first timing compensation module configured to detect a first timing error based on the digital output signal, and to adjust the sampling clock signal based on the first timing error;
• a phase-shift module configured to phase-shift the equalized digital output signal based on a phase-shift signal;
• and
• a second timing compensation module configured to detect a second timing error based on the equalized digital output signal, and to adjust the phase-shift signal based on the second timing error.