Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1992-02-03
1994-05-24
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7715, 360 70, 360 91, G11B 5584, G11B 558, H04N 578
Patent
active
053154576
ABSTRACT:
A video signal is recorded in successive tracks on a recording medium together with a pilot signal, the latter having a frequency that changes cyclically with a different one of at least four frequencies in successive tracks. A field detector detects sequential fields in the frames of the video signal, and rotation of the usual rotary transducers is servo-controlled in response to the detected sequence of fields and a pulse that is generated as the transducers rotate to represent the rotational phase of those transducers. A pilot signal generator generates the pilot signal with an initial frequency determined by an initial field in the detected field sequence, and with this frequency changing as a function of the detected sequential fields.
REFERENCES:
patent: 4573089 (1986-02-01), Maeda et al.
patent: 4658309 (1987-04-01), Tasuda et al.
patent: 4663673 (1987-05-01), Doutsubo
patent: 4823206 (1989-04-01), Nemoto et al.
patent: 4873585 (1989-10-01), Blanton et al.
Patent Abstracts of Japan, vol. 13, No. 142 (E-739) Apr. 7, 1989 & JP-A-63 304 781 (Sony Corp) Dec. 13, 1988.
Patent Abstracts of Japan vol. 11, No. 26 (P-539) Jan. 24, 1987 & JP-A-61 196 453 (Canon Inc) Aug. 30, 1986.
Hataoka Seiichi
Okada Tsunekazu
Ono Koichi
Frommer William S.
Psitos Aristotelis
Sheladia Varsha V.
Sinderbrand Alvin
Sony Corporation
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