Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2006-05-30
2006-05-30
Hindi, Nabil (Department: 2655)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S124150
Reexamination Certificate
active
07054238
ABSTRACT:
The present invention relates to a signal shaping circuit which is capable of shaping a returning light signal of a modulated signal whose signal level and signal length are arbitrarily varied such that it can be demodulated. The shaped signal pattern generation circuit15has, in advance, variation pattern information with regard to a predetermined variation pattern to be applied on a returning light signal recorded therein. The counter13inputs a returning light signal, counts a signal length thereof and sends a count value to the shaped signal pattern generation circuit15. An A/D conversion14detects a signal level of the returning light signal and sends the detected signal level to the shaped signal pattern generation circuit15in a similar way. The shaped signal pattern generation circuit15refers to the variation pattern information and calculates an optimum signal pattern corresponding to a signal length and a signal level of the inputted, returning light signal. The calculated shaped signal pattern is outputted to a shaped signal generation circuit16. Based on the signal pattern, the shaped signal generation circuit16converts the returning light signal and generates an optimum shaped signal.
REFERENCES:
patent: 6185172 (2001-02-01), Nakazawa
patent: 820053 (1998-01-01), None
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patent: 10-31825 (1998-02-01), None
Aida Toru
Saito Akiya
Sato Jun
Usui Yoshinobu
Hindi Nabil
Kananen Ronald P.
Rader & Fishman & Grauer, PLLC
Sony Corporation
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