EP0138202A2
Expired / Lapsed
EP
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Tracking system for rotary magnetic recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1984-10-11
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Granted: —
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Expires: 2004-10-11
Abstract
Abstract A tracking system for a rotary magnetic recording medium (10) includes a magnetic head (26) for sensing signals on a plurality of tracks formed on the recording medium such that a beginning and an end of recording align with each other, a head feeding unit (28, 30, 50) for transporting the magnetic head to a position where desired one of the tracks is located, and a control unit (100) for controlling the head feeding unit to effect tracking. The control unit (100) includes an operational unit (46, 104, 106, 108, 110) for sampling a signal sensed by the head in response to a rotation of the recording medium at a plurality of sampling points, and adds the sampled values with predetermined weights. Based on a result of the weighted addition, the control unit (100) performs a tracking control.
Inventors
- 👤 Haruo C/O Fuji Photo Film Co. Ltd. Itoh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 12:24
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/596; G11B5/59605; G11B5/59611; G11B27/00; G11B27/10; G11B27/34
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
144 words
A tracking system for a rotary magnetic recording medium comprising: magnetic transducer means (26,34) for sensing signals on a plurality of tracks each of which is formed on the recording medium (10) such that relative positions of a beginning and an end of recording align with each other; transducer feeding means (28, 30, 50) for feeding said transducer means to a position where desired one of the tracks is located; and control means (100) for controlling said feeding means to effect tracking; CHARACTERIZED IN THAT said control means (100) includes operational means (46, 104, 106, 108, 110) for sampling at a plurality of sampling points a signal sensed by said transducer means in response to the recording medium rotating, and summing the sampled values with predetermined weights; said control means (100) executing a tracking control in response to a result of the weighted addition.
Claim 2
Dependent Claim
144 words
A tracking system for a rotary magnetic recording medium comprising: magnetic transducer means (26,34) for sensing signals on a plurality of tracks each of which is formed on the recording medium (10) such that relative positions of a beginning and an end of recording align with each other; transducer feeding means (28, 30, 50) for feeding said transducer means to a position where desired one of the tracks is located; and control means (100) for controlling said feeding means to effect tracking; CHARACTERIZED IN THAT said control means (100) includes operational means (46, 104, 106, 108, 110) for sampling at a plurality of sampling points a signal sensed by said transducer means in response to the recording medium rotating, and summing the sampled values with predetermined weights; said control means (100) executing a tracking control in response to a result of the weighted addition.
Claim 3
Dependent Claim
81 words
A system in accordance with claim 1, CHARACTERIZED IN THAT a signal recorded on the tracks contains a video signal which constitutes one effective picture frame to be displayed on a screen; said operational means (46, 104, 106, 108, 110) sampling the signal at points associated with predetermined positions which include a central portion of the picture frame; the predetermined weights being larger in the central portion of the picture and smaller in a peripheral portion which surrounds the central portion.
Claim 4
Dependent Claim
21 words
A system in accordance with claim 1, CHARACTERIZED IN THAT said plurality of sampling points are selected in an odd number.
Claim 5
Dependent Claim
15 words
A system in accordance with claim 3, CHARACTERIZED IN THAT said odd number is nine.
Claim 6
Dependent Claim
55 words
A system in accordance with claim 1, wherein the video signals are recorded on the recording medium (10) in the form of frequency-modulated signals; CHARACTERIZED IN THAT said system further comprises means (38, 44) for detecting an envelope of the frequency-modulated signals to provide said operational means (104, 106, 108, 110) with the envelope detected.
Claim 7
Dependent Claim
19 words
A system in accordance with claim 1, CHARACTERIZED IN THAT said recording medium (10) comprises a magnetic recording disc.
References Cited (Backward Citations)
No citation records indexed.
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