Patent ID: 6581181
Filing Date: 2003-06-17
Classification: G11B

Abstract:
An apparatus to correct an error in a serial output signal generated by an optical Partial Response Maximum Likelihood (PRML) read channel processing a first set of input signals, the serial output signal representing a series of consecutive bits, the first set of input signals representing digitally a series of consecutive values, the apparatus comprising:error detection circuitry receiving the serial output signal and the first set of input signals, the error detection circuitry asserting an error signal in response to a determination that the serial output signal matches a first bit sequence associated with the error, that a first difference in a first pair of consecutive values represented by the first set of input signals is within a first range of values and that a second difference in a second pair of consecutive values represented by the first set of input signals is within a second range of values; and error correction circuitry receiving the error signal and the serial output signal, the error correction circuitry responding to assertion of the error signal by modifying a pair of consecutive bits represented by the serial output signal to generate a corrected output signal having a second bit sequence.