Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2005-03-02
2010-02-16
Young, Wayne R (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S047280
Reexamination Certificate
active
07663998
ABSTRACT:
An information reproduction device capable of a more appropriate frequency monitoring of a read clock, as compared to conventional devices, is realized. By providing the information reproduction device with a frequency difference detection means which detects a difference in frequencies between a read clock, obtained by applying PLL to a reproduction signal read from a recording medium, and a reference clock; an information processing means which performs signal processing on the reproduction signal and outputs a processing status information indicating whether or not the information processing is performed normally; and a frequency monitoring means which monitors whether or not the frequency of the read clock is normal based on the frequency difference and the processing status information; wherein the frequency monitoring means makes a transition to an OK status which indicates that the frequency of the read clock is normal when the processing status information is indicating a normal status; and makes a transition to a NG status which indicates that the frequency of the read clock is abnormal when the processing status information is indicating an abnormal status and the difference of the frequencies exceeds a first threshold; and returns to an OK status when the difference of the frequencies is below a second threshold during the NG status.
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Chiba Takayoshi
Nagata Masayoshi
Watanabe Atsushi
Giesy Adam R
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Sony Corporation
Young Wayne R
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