Read signal detection in ternary 3PM magnetic recording

Details Read signal detection in ternary 3PM magnetic recording Read signal detection in ternary 3PM magnetic recording

1984-01-16

1985-10-01

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

G11B 509

Patent

active

045449635

ABSTRACT:
Circuitry for distinguishing each value in a read signal magnetically recorded in ternary-3 position modulation in which the values 1, 2 and 0 are detected and equalized into a singlet, a doublet and absence of magnetic flux change. The circuitry first determines the position locations of each singlet peak and doublet crossover point to establish proper timing of the output signals and then identifies the particular type of signal appearing at the timing points in the read signal sequence. Singlets are identified by the much greater amplitudes in the integrated read signal. Doublets are identified as waveforms having slopes at zero crossovers that correspond in polarity to that of the previous singlet. A novel detector circuit is provided that can correctly identify doublets in a code sequence, irrespective of the presence of a previous singlet, when a recording rule is followed that includes the insertion of a number of consecutive ternary 0 symbols into the recorded signal.

REFERENCES:
patent: 4245263 (1981-01-01), Rathbun et al.
patent: 4260952 (1981-04-01), Thomas, Jr.

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