EP0213731A1
Expired / Lapsed
EP
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Index signal detecting system
Assignee: Sony Corp
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Filing: 1986-07-25
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Granted: —
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Expires: 2006-07-25
Abstract
Abstract An index signal detecting system for detecting an index signal recorded in a predetermined track area in the high speed playback mode is disclosed. According to this index signal detecting system, the rotary head is wobbled in the direction intersecting the track so that in the high speed playback mode, the index signal can always be picked up by the rotary head.
Inventors
- 👤 Takao C/O Sony Corporation Takahashi
- 👤 Hiroshi C/O Sony Corporation Okada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 14:05
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/09; G11B20/00; G11B20/10; G11B20/10527; G11B15/00; G11B15/18; G11B15/1808; G11B15/1875; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3009; G11B27/3027
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
An index signal detecting system for use in a helical scan type recording apparatus, the system comprising: a) rotary transducing means; b) tape driving means for advancing a recording tape in transducing relation to said rotary transducing means; and c) an index detecting circuit connected to said rotary transducing means for deriving index informations out of reproduced signals obtained from said rotary transducing means, characterised by the provision of d) wobbling means for wobbling relative positions of said rotary transducing means and recorded tracks formed on said recording tape so that the rotary transducing means cross said recording tracks.
Claim 2
Dependent Claim
99 words
An index signal detecting system for use in a helical scan type recording apparatus, the system comprising: a) rotary transducing means; b) tape driving means for advancing a recording tape in transducing relation to said rotary transducing means; and c) an index detecting circuit connected to said rotary transducing means for deriving index informations out of reproduced signals obtained from said rotary transducing means, characterised by the provision of d) wobbling means for wobbling relative positions of said rotary transducing means and recorded tracks formed on said recording tape so that the rotary transducing means cross said recording tracks.
Claim 3
Dependent Claim
34 words
Index signal detecting system according to claim 1 wherein said tape driving means includes a capstan and a pinch roller, and said wobbling means is provided with a capstan driving circuit for said capstan.
Claim 4
Dependent Claim
36 words
Index signal detecting system according to claim 1 or 2, wherein said capstan drives said recording tape at higher speed than normal recording speed in the case when the detection of said index informations is required.
Claim 5
Dependent Claim
36 words
Index signal detecting system as cited in claim 3, wherein said recorded tracks include digital data, and said index information is derived from reproduced digital data from said rotary transducing means at said index detecting circuit.
Claim 6
Dependent Claim
28 words
Index signal detecting system as cited in claim 4, wherein said wobbling means include a wobbling signal generator which supplies a wobbling signal to said capstan driving circuit.
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