US 5,892,632 A · Sampled amplitude read channel employing a residue number system FIR filter in an adaptive equalizer and in interpolated timing recovery

Abstract

A sampled amplitude read channel is disclosed for disk storage systems which asynchronously samples an analog read signal, adaptively equalizes the resulting discrete time sample values according to a target partial response, extracts synchronous sample values through interpolated timing recovery, and detects digital data from the synchronous sample values using a Viterbi sequence detector. To increase the speed of the read channel, the FIR filters in the equalizer and interpolator are implemented according to a residue number system. Further, the residue number system implementation of the FIR filters uses "one-hot" encoding to decrease power dissipation.

Claims16

Dependent claims

A sampled amplitude read channel for reading data from a sequence of discrete time sample values generated by sampling an analog read signal from a read head positioned over a storage medium, comprising:

(a) a sampling device for sampling the analog read signal to generate the discrete time sample values;
(b) an adaptive equalizer comprising a residue number system (RNS) FIR filter, responsive to the discrete time sample values, for generating equalized sample values according to a target response, the adaptive equalizer comprising:
(i) a coefficient input for receiving a plurality of RNS coefficients;
(ii) a RNS-to-binary converter for converting the RNS coefficients to binary coefficients;
(iii) a coefficient adaptor, responsive to the binary coefficients, for computing updated binary coefficients;
and
(iv) a binary-to-RNS converter for converting the updated binary coefficients to updated RNS coefficients;
the adaptive equalizer thereby generates the equalized sample values;
(c) timing recovery, responsive to the equalized sample values, for generating synchronous sample values;
and
(d) a discrete time sequence detector for detecting the data from the synchronous sample values.

8 more elements

Dependencies are inferred from the claim text.

Sampled amplitude read channel employing a residue number system FIR filter in an adaptive equalizer and in interpolated timing recovery

Life of this patent

Sampled amplitude read channel employing a residue number system FIR filter in an adaptive equalizer and in interpolated timing recovery

Life of this patent

Abstract

Claims16