Information recording and reproducing apparatus and method, and signal decoding circuit for performing timing recovery
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United States of America Patent
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Apr 7, 2009
Grant Date -
Aug 17, 2006
app pub date -
Mar 24, 2006
filing date -
Jan 21, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A timing recovery unit detects a phase offset and a frequency offset from a head area of reproduction data and initially corrects them. The timing recovery unit stores data in which a head reproduction signal has been made to be discrete by a fixed clock into a buffer. A phase offset detector detects the phase offset from the data head area in parallel with the operation for writing the data into the buffer. At the same time, a frequency offset detector detects the frequency offset from the data head area in parallel with the operation for writing the data into the buffer. A correction value of the detected phase offset and a correction value of the detected frequency offset are initially set into a digital PLL. While the data is read out from the buffer, a frequency lead-in and a phase lead-in are executed in the head area.
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