Dynamic magnetic information storage or retrieval – General processing of a digital signal – In specific code or form
Patent
1975-09-25
1977-08-02
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
In specific code or form
G11B 502, G11B 544
Patent
active
040401006
ABSTRACT:
The picture frames recorded on video magnetic tape are identified by serial binary numbers magnetically recorded along an edge of the tape. The sequential ONE and ZERO bits that form each number occur during equal successive intervals when the tape is transported at constant speed and these bits are detected as electrical pulse excursions, one pulse excursion during the interval for a ONE and no excursions during an interval for a ZERO. The pulses are detected even while the tape is not transported at constant speed as when it is accelerating or decelerating and so, the intervals for the successive binary bits may change rapidly and when that occurs, it is difficult to determine whether the successive excursions define a binary ZERO interval or the first half of a binary ONE interval and so, it cannot be determined whether they represent a binary ONE or a binary ZERO. In the present invention, the immediate or current interval between pulse excursions, herein called CT, and the immediately prior time between pulse excursions, referred to herein as PT, are compared and a series of logic steps are made with the following results: (1) when CT and PT are within a predetermined range of each other, then the current bit has the same binary sense as the prior bit; (2) when PT exceeds CT by at least a predetermined amount, then the current bit is a binary ONE; and (3) when CT exceeds PT by a predetermined amount, then the current binary bit is a ZERO.
REFERENCES:
patent: 3467955 (1969-09-01), Poomakis
patent: 3623040 (1971-11-01), Erikson
patent: 3900890 (1975-10-01), Eibner
Adams-Smith Incorporated
Canney Vincent P.
Dunn Robert T.
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