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AssigneeCirrus Logic, Inc.
InventorsJay N. Livingston, William G. Bliss
Estimating the term…
A sampled amplitude read channel is disclosed for disk storage systems comprising a encoder/decoder for implementing a high rate channel code that codes out specific minimum distance error events of a trellis sequence detector by enforcing a particular code constraint. The trellis sequence detector comprises a state machine matched to the code constraint which effectively removes the corresponding minimum distance errors from the detected output sequence. Additionally, the channel code encodes redundancy bits into the write data for implementing an error detection code. The redundancy bits are processed during a read operation to generate an error syndrome used to detect and correct other dominant error events, such as the NRZ (+) and (+−+) error events. In this manner, the most likely error events of the trellis sequence detector are either coded out by the channel code constraint, or detected and corrected using the error syndrome. As a result, the present invention provides a significant distance enhancing performance gain over the prior art without decreasing the system's code rate, thereby providing a substantial increase in linear bit density and overall storage capacity.
A sampled amplitude read channel for reading data recorded on a disk storage medium by detecting an estimated binary sequence from a sequence of discrete-time sample values generated by sampling an analog read signal emanating from a read head positioned over the disk storage medium, the sampled amplitude read channel comprising:
A sampled amplitude read/write channel for writing user data to a disk storage medium and reading the user data from the disk storage medium, comprising:
A method for writing and reading user data to and from a disk storage medium, comprising the steps of:
A sampled amplitude read/write channel for writing user data to a disk storage medium and reading the user data from the disk storage medium, comprising:
Dependencies are inferred from the claim text.