Method and apparatus for sampling a synchronous pattern from dat

Details Method and apparatus for sampling a synchronous pattern from dat Method and apparatus for sampling a synchronous pattern from dat

1997-05-30

1999-08-10

Young, W. R.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

360 51, 386 48, G11B 700

Patent

active

059369221

ABSTRACT:
In a method for exactly sampling a synchronous pattern from read data including an error from a recording medium and an apparatus for carrying out the method, a system clock signal is received and the starting portion of each data region concerning the read data from the recording medium having a track structure is counted by using the received system clock signal. The counting value is compared with a standard counting value and the present data region is judged according to the compared result. A same random synchronous signal as a synchronous pattern concerning the data region judged from each data region of the read data, is generated. A first and a second sampling signals are generated in a synchronization block of a unit based on the first and the second synchronous pattern generated from the random synchronous signal. A normal synchronous pattern concerning each data region is sampled based on the random synchronous signal and on the first and the second sampling signals. An accurate synchronous pattern concerning each data region can be obtained irrespective of the presence of an error.

REFERENCES:
patent: 4674088 (1987-06-01), Grover
patent: 4752837 (1988-06-01), DeLand, Jr.
patent: 5047877 (1991-09-01), Herting
patent: 5553043 (1996-09-01), Yamaguchi et al.
patent: 5572496 (1996-11-01), Hayashi et al.
patent: 5668840 (1997-09-01), Takano

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