Appeal No. 1999-1449
Application 08/640,351
(b) an adaptive equalizer, responsive to the discrete time
sample values, for generating equalized sample values
according to a target response;
(c) an interpolated timing recovery circuit for generating
interpolated sample values; and
(d) a discrete time sequence detector for detecting the
digital data from the interpolated sample values,
wherein:
the adaptive equalizer comprises an FIR filter comprising a
plurality of filter coefficients;
the adaptive equalizer is responsive to an error value ek
computed as a function of an output of the FIR filter
and an estimated ideal value;
the adaptive equalizer comprises an interpolation circuit,
responsive to the interpolated sample values, for
generating the error value ek synchronous with the
discrete time sample values.
17. A method for reading digital data from a sequence of
discrete time sample values generated by sampling an analog read
signal from a read head positioned over a magnetic medium,
wherein the analog read signal comprises pulses modulated by the
digital data at a predetermined baud rate, the method comprising
the steps of:
(a) asynchronously sampling the analog read signal to
generate asynchronous sample values;
(b) adaptively equalizing the asynchronous sample values to
generate equalized sample values according to a target
response, comprising the steps of:
(i) computing an error value as a function of a baud
rate synchronous sample value and an estimated ideal
sample value; and
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