EP0323910A2
Expired / Lapsed
EP
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Search methods for recording media
Assignee: Hewlett Packard Ltd
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Filing: 1989-01-06
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Granted: —
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Expires: 2009-01-06
Abstract
Abstract A method of position detection on a recording medium is performed by moving the recording medium alternately in normal and reverse directions while searching for a target position, and decreasing the transport speed of the recording medium with each change of direction. Immediately after the target position has been passed after a predetermined number of detections, a report signal of search completion is generated, thereby shortening the search time.
Inventors
- 👤 Yoshizumi C/O Patents Division Inazawa
- 👤 Brian C/O Hewlett-Packard Limited Milthorp
- 👤 Bruce C/O Hewlett-Packard Limited Thompson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 10:33
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/05; G11B15/087; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; G11B27/3063; G11B15/026; G11B27/102; G11B27/107; G11B2220/00; G11B2220/90; G11B2220/91; G11B2220/913
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
A search method for use with a recording medium (15) on which a plurality of position signals (GPC) are recorded at intervals, the method comprising the steps of: driving the recording medium (15) initially in one direction while detecting the recorded position signals (GPC) from a position which is fixed relative to the recording medium (15); reversing the driving direction of the recording medium (15) when a predetermined recorded position signal is detected; decreasing the speed of the recording medium (15) until the predetermined recorded position signal is detected again; repeating the foregoing steps a predetermined number of times so as to detect a target position on the recording medium (15); and after detecting that the target position has been last passed, generating a report signal indicating that the target position has been searched.
Claim 2
Dependent Claim
134 words
A search method for use with a recording medium (15) on which a plurality of position signals (GPC) are recorded at intervals, the method comprising the steps of: driving the recording medium (15) initially in one direction while detecting the recorded position signals (GPC) from a position which is fixed relative to the recording medium (15); reversing the driving direction of the recording medium (15) when a predetermined recorded position signal is detected; decreasing the speed of the recording medium (15) until the predetermined recorded position signal is detected again; repeating the foregoing steps a predetermined number of times so as to detect a target position on the recording medium (15); and after detecting that the target position has been last passed, generating a report signal indicating that the target position has been searched.
Claim 3
Dependent Claim
56 words
A search method according to claim 1, wherein data is recorded in a plurality of units on the recording medium (15) and wherein main data is recorded in a first area in every unit on the recording medium, and a unit count signal and other count signals are recorded in a second area in every unit.
Claim 4
Dependent Claim
37 words
A search method according to claim 2, wherein a digital audio tape recorder (1) is used in performing the search, the first area is a pulse code modulation area and the second area is a sub-code area.
Claim 5
Dependent Claim
81 words
A search method according to claim 1, claim 2 or claim 3, wherein a target count value and a unit count value reproduced from the recording medium (15) are compared with each other, the direction and the speed of the recording medium are controlled in accordance with the comparison output, and when the count value reproduced from the recording medium becomes close to the target count value, the report signal is generated after detecting a division of the unit count signal.
Claim 6
Dependent Claim
34 words
Apparatus for searching a recording medium (15) on which a plurality of position signals (GPC) are recorded at intervals, the apparatus being operable by a method according to any one of the preceding claims.
References Cited (Backward Citations)
No citation records indexed.
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