Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction
Reexamination Certificate
1998-09-02
2001-03-27
Moise, Emmanuel L. (Department: 2133)
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital data error correction
C360S051000, C375S357000, C375S360000
Reexamination Certificate
active
06209117
ABSTRACT:
The following disclosure is based on Korean Patent Application No. 97-62050, filed on Nov. 21, 1997, which is incorporated into this application by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to synchronous signal detection, and more particularly, to a method for canceling an abnormal synchronous signal using the periodicity of a synchronization signal.
2. Description of the Related Art
Signal processing and recording/reproduction (or transmission/reception) are now generally done digitally for multimedia applications. In this digital recording/reproduction, a signal is recorded on a recording medium in units of a synchronization block in order to successfully restore the original recorded signal upon reproduction. Also, a synchronization signal of a predetermined pattern is periodically recorded on the recording medium, and detected upon reproduction, to be used as a reference signal for signal processing.
Upon the detection of the synchronization signal, abnormal synchronous signals other than a desired synchronization signal may possibly be generated according to the state and conditions of a channel, or a synchronization signal may be damaged. Thus, appropriate processing is required. In particular, abnormal synchronization signals are frequently detected in addition to the normal recorded synchronization signals. These mis-detected synchronization signals prevent the restoration of the original signal.
SUMMARY OF THE INVENTION
To solve the above problem, it is an objective of the present invention to provide a method for canceling an abnormal synchronization signal, for a digital recording/reproduction apparatus or a digital transmission/reception apparatus in order to detect only normal synchronization signals and remove abnormal synchronization signals other than the normal synchronization signals.
Another objective of the present invention is to provide a method for canceling abnormal synchronization signals, for a digital recording/reproduction apparatus having a standard definition (SD) format, in order to detect only normal synchronization signals and remove abnormal synchronization signals other than the normal synchronization signals.
Accordingly, to achieve the first objective, there is provided a method of canceling an abnormal synchronous signal, comprising the steps of: detecting a predetermined pattern data synchronous signal from input digital data, and deciding that a detected synchronous signal is an actual synchronous signal if the detected synchronous signal has periodicity, and otherwise, annulling the detected synchronous signal.
To achieve the second objective, there is provided a method of canceling an abnormal synchronous signal in a method of recording digital data in divided pre-synchronous blocks and data synchronous blocks and reproducing the recorded digital data, comprising the steps of: detecting a predetermined pattern data synchronous signal from the recorded digital data, deciding that a detected synchronous signal is an actual synchronous signal if the detected synchronous signal has a first period, and, otherwise, annulling the detected synchronous signal.
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Moise Emmanuel L.
Samsung Electronics Co,. Ltd.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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