Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2007-04-17
2007-04-17
Ha, Dac V. (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S263000, C375S265000, C375S341000, C714S794000, C714S795000, C714S796000
Reexamination Certificate
active
10154898
ABSTRACT:
A signal evaluation device for evaluating a decoded signal of maximum likelihood decoding includes: a differential metric circuit for finding differential metrics; comparators for judging whether a difference of differential metrics exceeds a predetermined threshold; counters for counting respective output pulses of the comparators; and a controller for finding the probability of the differential metrics falling at or below the predetermined threshold, based on the number of measured samples and the number of samples counted by the counters, and processing the probability by arithmetic operations so as to obtain an index of signal evaluation. With this arrangement, signal evaluation devices for evaluating a recording medium or a recording medium driving device can have a simpler structure and can perform evaluations in a plurality of PR modes.
REFERENCES:
patent: 5648921 (1997-07-01), Araki et al.
patent: 5696756 (1997-12-01), Fujimoto et al.
patent: 5761212 (1998-06-01), Foland et al.
patent: 5938791 (1999-08-01), Narahara
patent: 6735724 (2004-05-01), McClellan
patent: 0871170 (1998-10-01), None
patent: 07-321654 (1995-12-01), None
patent: 09-115167 (1997-05-01), None
patent: 10-320931 (1998-12-01), None
patent: 11-025538 (1999-01-01), None
patent: 11007727 (1999-01-01), None
patent: 2000-040201 (2000-02-01), None
patent: 2001-319430 (2001-11-01), None
patent: 1996-0005276 (1996-02-01), None
patent: 1999-48996 (1999-07-01), None
patent: WO-98/33174 (1998-07-01), None
K. Fujimoto, et al., “An Application of Viterbi Decoding to PR(1,2,1) Magneto-Optical Recording Channel,” Proceedings of the 5thSony Research Forum (1995), pp. 465-469.
T. Okumura, et al., “A Method for Evaluating PRML System Reliability Using Sequenced Amplitude Margin,” ISOM '01 International Symposium on Optical Memory 2001, pp. 272-273.
T. Okumura, et al., “Method for Evaluating Partial Response Maximum Likelihood System Performance Using Sequenced Amplitude Margin,” Japanese Journal of Applied Physics Part 1, Regular Papers, Short Notes & Review Papers, Mar. 2002, vol. 41, No. 3B, pp. 1783-1784.
A. Taratorin, PRML: A Practical Approach, Introduction to PRML Concepts and Measurements, Guzik Technical Enterprises, 1995, pp. 65-68.
T. Perkins, et al. “A Window-Margin-Like Procedure for Evaluating PRML Channel Performance,” IEEE Transactions on Magnetics, vol. 31, No. 2, Mar. 1995, pp. 1109-1114.
Korean Office Action dated Mar. 29, 2005 (with English translation thereof).
Japanese Office Action mailed on Nov. 22, 2005 (with English translation thereof).
European Search Report dated Sep. 20, 2006 for corresponding European Application No. 02011480.7.
Japanese Office Action dated Jun. 13, 2006 for the corresponding Japanese Application JP 2002-081845.
Akiyama Jun
Maeda Shigemi
Numata Tomiyuki
Okumura Tetsuya
Ushioda Masanori
Conlin David G.
Edwards Angell Palmer & & Dodge LLP
Ha Dac V.
Penny, Jr. John J.
Sharp Kabushiki Kaisha
LandOfFree
Signal evaluation devices and signal evaluation methods,... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Signal evaluation devices and signal evaluation methods,..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Signal evaluation devices and signal evaluation methods,... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3720672