초록 ▼

In a computer disk storage system for recording binary data, a sampled amplitude read channel comprises a sampling device for asynchronously sampling pulses in an analog read signal from a read head positioned over a disk storage medium, interpolated timing recovery for generating synchronous sample

In a computer disk storage system for recording binary data, a sampled amplitude read channel comprises a sampling device for asynchronously sampling pulses in an analog read signal from a read head positioned over a disk storage medium, interpolated timing recovery for generating synchronous sample values, and a sequence detector for detecting the binary data from the synchronous sample values. The sequence detector comprises a demodulator for detecting a preliminary binary sequence which may contain bit errors, a remodulator for remodulating to estimated sample values, a means for generating sample error values, an error pattern detector for detecting the bit errors, an error detection validator, and an error corrector for correcting the bit errors. The remodulator comprises a partial erasure circuit which compensates for the non-linear reduction in amplitude of a primary pulse caused by secondary pulses located near the primary pulse. The error pattern detector comprises a peak error pattern detector and, if an error pattern is detected, a means for disabling the error pattern detector until the detected error pattern has been fully processed. The error detection validator checks the validity of a detected error event and, if valid, enables operation of the error corrector.

대표청구항 ▼

[ We claim:] [1.] A sampled amplitude read channel for reading binary data from a sequence of discrete time sample values generated by sampling pulses in an analog read signal from a read head positioned over a disk storage medium, comprising:(a) a sampling device for sampling the analog read signal

[ We claim:] [1.] A sampled amplitude read channel for reading binary data from a sequence of discrete time sample values generated by sampling pulses in an analog read signal from a read head positioned over a disk storage medium, comprising:(a) a sampling device for sampling the analog read signal to generate a sequence of asynchronous sample values;(b) an interpolator for interpolating the asynchronous sample values to generate synchronous sample values; and(c) a discrete time detector for detecting the binary data from the synchronous sample values, comprising:(a) a demodulator, responsive to the synchronous sample values, for detecting a binary sequence having one or more bit errors;(b) a remodulator for converting the binary sequence into a sequence of estimated sample values;(c) an adder, responsive to the synchronous sample values and the estimated sample values, for generating a sequence of sample error values;(d) an error pattern detector, responsive to the sequence of sample error values, for detecting a magnitude and location of the bit errors in the binary sequence; and(e) an error corrector, responsive to the magnitude and location of the bit errors, for correcting the binary sequence.