Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2006-03-10
2008-10-07
Feild, Joseph (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S059190
Reexamination Certificate
active
07433286
ABSTRACT:
In a jitter detection apparatus, a playback RF signal3detected from an optical disc medium1is subjected to waveform shaping, and thereafter, converted into a digital RF signal6with a sampling clock having a cycle twice as long as a cycle of a channel clock. Thereafter, an offset variation in a high-frequency band is corrected by an offset correction circuit9, and data that are missing in the time direction are restored by a Nyquist interpolation filter23. Then, positions where jitter is to be extracted are selected from an output signal of the Nyquist interpolation filter23, by a jitter detection preprocessing circuit28, according to the playback speed of the optical disc medium1and the arithmetic capacity of a digital signal operation circuit29, whereby highly accurate jitters can be extracted by using the digital signal operation circuit29.
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Konishi Shinichi
Ogura Youichi
Takahashi Toshihiko
Agustin Peter Vincent
Feild Joseph
Matsushita Electric - Industrial Co., Ltd.
Wenderoth , Lind & Ponack, L.L.P.
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