Telegraphy – Systems – Printing
Patent
1977-11-02
1978-11-07
Robinson, Thomas A.
Telegraphy
Systems
Printing
178 691, 325 38A, 340347DD, H04J 306, H04L 708
Patent
active
041247787
ABSTRACT:
A circuit is disclosed for serially formatting digital information such as may be provided in a digital audio magnetic tape recorder in a succession of data blocks or frames, each containing the same number of digital bits and in which each frame is delineated by a uniquely occurring digital frame synchronizing signal. The digital information is formatted in a Miller or 3F code in which allowable transitions between successive "1"s and "0"s result in pulses which are 1, 1-1/2 or 2 times the duration of a bit cell, hence giving rise to three characteristic frequencies and the term 3F code. The frame synchronizing signal is generated by providing a signal comprising digital bits 1-0-0-1, which signal in a 3F code is characterized by a transition between the adjacent "0"s, and by appropriately inhibiting that transition, thus creating a pulse which is three times the duration of a unit cell, hence giving rise to a new fourth frequency which cannot be normally created by any succession of "1"s or "0"s.
REFERENCES:
patent: 4002845 (1977-01-01), Kaul et al.
patent: 4010421 (1977-03-01), Lind
patent: 4020282 (1977-04-01), Halpern
patent: 4045613 (1977-08-01), Walker
patent: 4054754 (1977-10-01), Nicodemus et al.
Alexander Cruzan
Barte William B.
Minnesota Mining and Manufacturing Company
Robinson Thomas A.
Sell Donald M.
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