| US 7,515,369 B2 | ||
| Information recording and reproducing apparatus and method, and signal decoding circuit for performing timing recovery | ||
| Takao Sugawara, Kawasaki (Japan); Motomu Takatsu, Kawasaki (Japan); and Masaru Sawada, Kawasaki (Japan) | ||
| Assigned to Fujitsu Limited, Kawasaki (Japan) | ||
| Filed on Mar. 24, 2006, as Appl. No. 11/388,377. | ||
| Application 11/388377 is a division of application No. 10/273485, filed on Oct. 18, 2002, granted, now 7,054,088. | ||
| Claims priority of application No. 2002-011018 (JP), filed on Jan. 21, 2002; and application No. 2002-095505 (JP), filed on Mar. 29, 2002. | ||
| Prior Publication US 2006/0181797 A1, Aug. 17, 2006 | ||
| Int. Cl. G11B 5/09 (2006.01) | ||
| U.S. Cl. 360—51 | 3 Claims |
| 1. An information recording and reproducing apparatus for recording and reproducing information onto/from a magnetic recording
medium, comprising:
an A/D converter which inputs a read signal of a symbol rate and outputs a sampling signal that is asynchronously oversampled;
an oversampling equalizer which waveform-equalizes said oversampled sampling signal;
a timing recovery unit having an interpolating filter which interpolates said equalization signal and down-samples it to the
symbol rate; and
a training circuit which, when a discrimination error between an output signal of said interpolating filter and the symbol
rate obtained from a discrimination signal of a discriminator is fed back to training of said oversampling equalizer, inversely
interpolates said discrimination error multiplying by the tap factor of said interpolating filter entered via the delay circuit
and outputs the result to said oversampling equalizer via a factor updating circuit.
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