Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1997-03-10
1999-09-07
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 51, G11B 5584
Patent
active
059496061
ABSTRACT:
In the case of various recording systems based on the helical-scan method for magnetic tapes, a pilot-tone principle is used for tracking control, generally using two pilot tones which are recorded on the helical tracks respectively in series of four: pilot tone F1, no pilot tone, pilot tone F2, no pilot tone. Known methods for determining the pilot-tone amplitudes use narrow-banded band filters, a control signal being generated by forming the difference between the amplitudes. On account of the weak pilot tones, this requires very narrow-banded filters with good dynamic properties.
According to the invention, a quadrature mixing has the effect of converting the two pilot tones into the baseband, whereby the filtering is performed in the low-pass range and a control signal can be derived from the difference between the pilot-tone amplitudes thus determined.
REFERENCES:
patent: 5258879 (1993-11-01), Shimotashiro et al.
patent: 5369376 (1994-11-01), Leblebicioglu
patent: 5404250 (1995-04-01), Hase et al.
patent: 5594602 (1997-01-01), Isaka et al.
patent: 5754356 (1998-05-01), Honjo et al.
JP 4-258807 A Patents Abstracts of Japan, P-1476, Jan. 28, 1993 vol. 17, No. 45.
Kaaden Juergen
Roth Sabine
Schemmann Heinrich
Davenport Francis A.
Deutsche Thomson-Brandt GmbH
Habermehl James L.
Laks Joseph J.
Psitos Aristotelis M.
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