Timing recovery apparatus and method using equalizer and apparatus for judging last data
First Claim
1. A timing recovery apparatus comprising:
- a sampling means for sampling a reproduced signal;
an equalizing means for filtering the signal sampled by the sampling means so as to be output as a target signal E2PR4MLa feedback filter means using predetermined binary data as an input;
an adding means for adding the output signal of the feedback filter to the output signal of the equalizing means and for outputting a new target signal;
a data judging means for detecting binary data on the basis of the new target signal output from the adding means, generating quaternary data from the detected binary data, and delaying the new target signal by a predetermined time; and
a timing recovery means for recovering timing by detecting a timing error signal using the quaternary data and the delayed new target signal from the data judging means, phase synchronizing the detected timing error signal, and providing the phase-synchronized signal as a clock of the sampling means.
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Accused Products
Abstract
An apparatus for recovering timing using an equalizer of an E2PR4ML method and a method therefor and a last data judging apparatus. The timing recovery apparatus includes a sampling unit for sampling a reproduced signal and an equalizing unit for filtering the signal sampled by the sampling unit so as to output as a target signal E2PR4ML for detecting a timing error signal using the target signal output from the equalizing unit, phase synchronizing the detected timing error signal, and providing the phase-synchronized signal as a clock signal of the sampling unit. The timing recovery apparatus also includes a feedback filter using predetermined binary data as an input, an adder for adding the output signal of the feedback filter to the output signal of the equalizing unit and for outputting a new target signal, a data judging unit for detecting binary data on the basis of the new target signal and for generating quaternary data from the detected binary data, and a timing recovery unit for recovering timing by calculating the timing error of the sampling clock using the output signal of the data judging unit.
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Citations
11 Claims
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1. A timing recovery apparatus comprising:
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a sampling means for sampling a reproduced signal; an equalizing means for filtering the signal sampled by the sampling means so as to be output as a target signal E2PR4ML a feedback filter means using predetermined binary data as an input; an adding means for adding the output signal of the feedback filter to the output signal of the equalizing means and for outputting a new target signal; a data judging means for detecting binary data on the basis of the new target signal output from the adding means, generating quaternary data from the detected binary data, and delaying the new target signal by a predetermined time; and a timing recovery means for recovering timing by detecting a timing error signal using the quaternary data and the delayed new target signal from the data judging means, phase synchronizing the detected timing error signal, and providing the phase-synchronized signal as a clock of the sampling means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for recovering timing of a system using a target signal E2PR4ML in a reproduced signal processing apparatus for magnetic recording, comprising the steps of:
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A. sampling a reproduced signal; B. filtering the signal sampled in step A so as to be output as a E2PR4ML target signal; C. converting the E2PR4ML target signal output from step B into a new target signal represented by a formula, H'"'"'(D)=1+2D, in which D denotes a one-sample delay; D. receiving the new target signal output in step C, delaying the new target signal by a predetermined amount of time, detecting binary data using the delayed new target signal and the new target signal, and generating quaternary data from the detected binary data; and E. calculating a timing error using the delayed new target signal output in step D and the quaternary data, reconstructing timing, and providing the result as a clock of the sampling step A.
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10. A last data judging apparatus in a magnetic recording and reproducing signal processing apparatus, comprising:
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a sampling unit for sampling a reproduced signal; an equalizing unit for filtering the signal sampled by the sampling unit so as to be output as a target signal E2PR4ML; a first Viterbi decoder for receiving the signal output from the equalizing unit and judging last data; a feedback filter using predetermined binary data as an input; adding means for adding the output signal of the feedback filter to the output signal of the equalizing unit and outputting a new target signal; data judging means for delaying the new target signal output from the adding means by a predetermined time, detecting the binary data on the basis of the new target signal, and generating quaternary data using the detected binary data; and a second Viterbi decoder for judging the last data using the delayed new target signal output from the data judging means. - View Dependent Claims (11)
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Specification