Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal gain processing
Patent
1996-04-05
1998-07-07
Edun, Muhammad N.
Dynamic information storage or retrieval
Binary pulse train information signal
Binary signal gain processing
369 50, 369 54, G11B 700
Patent
active
057779678
ABSTRACT:
A phase error between an information signal including a reference signal that can be detected asynchronously and a synchronized signal that is synchronously produced from the information signal is detected, and a signal in response to an absolute value of the phase error is produced. Further, a defect detecting signal is produced in response to the absolute value of the phase error. Therefore, whether a pulse signal exceeding a maximum value of the pulse width of the information signal, that is, a pulse signal exceeding the pulse width of the reference signal, is detected or not, it is possible to detect that the signal reproduction enters a defect region immediately after the entry. Accordingly, a defect with noise or a track jumping can be detected rapidly. Furthermore, an information transition interval of the information signal is measured for a prescribed period of time, and the defect detecting signal is terminated in response to a measured value of a time length of the reference signal that is detected in the prescribed period of time, in other words, the passing of the signal reproduction through the defect region is detected with reference to the synchronization of the reference signal. Therefore, pseudo locking of a PLL is avoided when it is operated again, and the PLL can be accurately re-locked.
REFERENCES:
patent: 5088080 (1992-02-01), Ishibashi et al.
patent: 5204848 (1993-04-01), Cardero et al.
patent: 5218589 (1993-06-01), Aoki
patent: 5663942 (1997-09-01), Ishibashi et al.
Edahiro Yasuaki
Horibe Ryusuke
Ishibashi Hiromichi
Miyachi Hiroyuki
Moriya Mitsurou
Edun Muhammad N.
Matsushita Electric - Industrial Co., Ltd.
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