公开(公告)号：JP2001273720A

公开(公告)日：2001-10-05

申请号：JP2001037421

申请日：2001-02-14

Applicant: ST MICROELECTRONICS INC

Inventor： OZDEMIR HAKAN ,  BYRNE JASON D

IPC: G11B20/10 ,  G11B20/14 ,  H03L7/091

Abstract: PROBLEM TO BE SOLVED: To provide improved technology to determine the phase difference between a sample clock and sampled signals. SOLUTION: The circuit is provided with a buffer which receives two sampled signals and stores the signals and a phase computing circuit which computes the phase difference between one of the sampled signals and a prescribed point of the signals. The circuit is used to reduce matching obtaining time of a digital timing recovery loop. Thus, the use of the circuit makes it possible to reduce sector preamble and also to increase the data storage density of a disk. In one embodiment, the circuit is used to determine an initial phase difference between disk drive reading signals and a reading sample clock. The digital timing recovery loop provides an initial coarse matching between read signals and a sample clock by using the phase difference. By giving the initial coarse matching, the recovery loop reduces overall matching obtaining time.

公开(公告)号：JP2002304820A

公开(公告)日：2002-10-18

申请号：JP2002037007

申请日：2002-02-14

Applicant: ST MICROELECTRONICS INC

Inventor： OZDEMIR HAKAN ,  BYRNE JASON D ,  HEYDARI FEREIDOON

IPC: G11B20/10 ,  G11B20/14 ,  G11B20/18 ,  H03M13/41

Abstract: PROBLEM TO BE SOLVED: To provide an enhanced Viterbi detector that recovers a binary sequence from a read signal read by a disk drive system or the like. SOLUTION: This invention provides the Viterbi detector receiving a signal that represents a binary sequence having groups of no more and no fewer than a predetermined number of consecutive bits each having a first logic level, where the groups are separated from each other by respective bits having a second logic level. The Viterbi detector recovers the binary sequence from the signal by calculating a respective path metric for each of no more than four possible states of the binary sequence, and determining a surviving path from the calculated path metrics, where the binary sequence lies along the surviving path. Or the Viterbi decoder recovers the binary sequence from the signal by calculating respective path metrics for possible states of the binary sequence, calculating multiple path metrics for no more than one of the possible states, and determining the surviving path from the calculated path metrics.

公开(公告)号：DE60122402D1

公开(公告)日：2006-10-05

申请号：DE60122402

申请日：2001-01-30

Applicant: ST MICROELECTRONICS INC

Inventor： OZDEMIR HAKAN ,  BYRNE JASON D

IPC: H03L7/091 ,  G11B20/10 ,  G11B20/14