Survival sequence register for variable threshold qualification

Details Survival sequence register for variable threshold qualification Survival sequence register for variable threshold qualification

1994-11-29

1996-10-29

Beausoliel, Jr., Robert W.

Excavating

371 48, G06F 1100

Patent

active

055703801

ABSTRACT:
A survival sequence register for a read channel employing a variable threshold peak qualification technique, has a first data shift register receiving a logic sum stream of two serial streams of coded digital data, corresponding to qualified peaks detected by a reading pick-up of positive and negative sign, respectively, and a pointer register. A control circuit generates an erase signal when an incoming pulse is recognized as corresponding to a detected peak of the same sign of the previously detected peak. The erase signal is input to logic gates which each drive a reset terminal of a flip-flop of the data shift register, with the exception of the first flip-flop of the register. The pointer register being reset when the control circuit receives a pulse corresponding to a peak of opposite polarity of the detected peak relative to the preceding pulse.

REFERENCES:
patent: 4000513 (1976-12-01), Precourt
patent: 4626933 (1986-12-01), Bucska et al.
patent: 4634896 (1987-01-01), Shrinkle
IEEE Transactions on Magnetics, Y. Ouchi, et al., "A New Signal Detection Method With Two Slice Levels", Sep., 1987, pp. 3675-3677.
24th Assilomar Conference K. Chopra et al., A Soft Decision Detection Method for Run-Length Limited Recording Channels, p. 679.

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