Boots – shoes – and leggings
Patent
1991-12-02
1995-07-04
Chin, Stephen
Boots, shoes, and leggings
G06F 1520
Patent
active
054306612
ABSTRACT:
Adaptive decision feedback equalizer apparatus for processing information stored on disk or tape media or the like including a data input buffer (34), a gain acquisition circuit (42), a timing acquisition circuit (40) operative to generate timing error signals for controlling the sampling phase of the read signals input to the input buffer, a synchronizing circuit (44) for generating sync detect signals and polarity signals, an FIR filter (36) for generating linear filter output signals, register means (39), feedforward update logic (38) for adjusting the equalizer coefficient signals to develop updated coefficient signals, a dual ported RAM (50) for storing a plurality of the equalizer coefficient signals, feedback logic (48) responsive to the linear filter output signals, equalizer coefficient signals obtained from the RAM, and train data signals, and operative to compute the equalizer error signals and equalizer output signals, feedback update logic (52) for adjusting the values of the coefficient signals for input back to the RAM as update signals, steady-state timing logic (54), and a controller (46) responsive to the polarity signals and the sync detect signals and operative to generate the train data signals and mode control signals for causing the equalizer apparatus to operate in either a set-up/test mode or a run mode, whereby read signals input from a storage media are sampled, amplified and digitally processed to decode stored information bits with the result that, as compared to prior art systems, storage density may be increased and error rate decreased.
REFERENCES:
patent: 4412341 (1983-10-01), Gersho et al.
patent: 4422109 (1983-12-01), Sampei et al.
patent: 4908722 (1990-05-01), Sonobe
patent: 4953041 (1990-08-01), Huber
patent: 4953183 (1990-08-01), Bergmans et al.
patent: 5008903 (1991-04-01), Betts et al.
patent: 5132988 (1992-07-01), Fisher et al.
Bednarz et al., "Rounding and Negation in Reduced Precision Multiplication" (Sep. 18, 1991); unpublished paper, Dept. of E.E., Stanford University.
Abbott et al., "Timing Recovery for Adaptive Decision Feedback Equalization of the Magnetic Storage Channel" (Dec. 1990); Globecom '90.
Schouhamer Immink, "Runlength-Limited Sequences" (Nov. 1990); Proceedings of the IEEE, vol. 78, No. 11.
Abbott et al., "A High-Speed Adaptive Equalizer for Magnetic Disk Drives" (Apr. 1990), Int. Conference on Acoustics, Speech, & Signal Processing, Albuquerque, N.M.
Cioffi et al., "Adaptive Equalization in Magnetic-Disk Storage Channels" (Feb. 1990), IEEE Communications Magazine.
Fisher et al., "An Adaptive RAM-DFE for Storage Channels" (Jun. 1989), IEEE Trans. Comm Conference Jun. 1989 (workshop Sep. 1988).
Fisher et al., "An Adaptive DFE for Storage Channels Suffering from Nonlinear ISI" (Jun. 1989), Int'l Conference on Communications, Boston.
Kryder, "The Special Section on Magnetic Information Storage Technology" (Nov. 1986), Proceedings of the IEEE, Nov. 1986, pp. 1475-1476.
Biglieri et al., "Adaptive Cancellation of Nonlinear Intersymbol Interference for Voiceband Data Transmission" (Sep. 1984), IEEE Journal on Selected Areas in Communications, vol. SAC-2, No. 5.
Gitlin et al., "The Tap-Leakage Algorithm: An Algorithm for the Stable Operation of Digitally Implemented, Fractionally Spaced Adaptive Equalizer" (Oct. 1982), Bell System Technical, vol. 61, No. 8.
Gersho et al., "Adaptive Cancellation of Intersymbol Interference for Data Transmission" (Nov. 1981), Bell System Technical Journal, vol. 60, No. 11.
Holte et al., "A New Digital Echo Canceler for Two-Wire Subscriber Lines" (Nov. 1981), IEEE Transactions on Communications, vol. COM-29, No. 11.
Falconer, "Adaptive Equalization of Channel Nonlinearities in QAM Data Transmission Systems" (Sep. 1978), Bell System Technical Journal, vol. 57, No. 7.
Qureshi, "Timing Recovery for Equalized Partial-Response Systems" (Dec. 1976), IEEE Transactions on Communications, pp. 1326-1331.
Mueller et al., "Timing Recovery in Digital Synchronous Data Receivers" (May 1976), IEEE Transactions on Communications, vol. COM-21, No. 5.
Wallace, "A Suggestion for a Fast Multiplier" (Feb. 1964), IEEE Transactions on Electronic Computers.
Abbott William L.
Bednarz Philip S.
Cioffi John M.
Fisher Kevin D.
Board of Trustees Leland Stanford Jr., University
Chin Stephen
Hamrick Claude A. S.
Webster Bryan E.
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