Index signal detecting system
AssigneeSony Corporation
InventorsTakao Takahashi, Hiroshi Okada
Life of this patent
Estimating the term…
Abstract
An index signal detecting system for detecting an index signal recorded in a predetermined track area in a high speed playback mode. According to this index signal detecting system, the rotary head is wobbled in a direction intersecting the track so that in the high speed playback mode, the index signal can always be picked up by the rotary head.
Claims7
An index signal detecting system applied to a helical scan type recording apparatus for detecting program search index information recorded on slant tracks of a recording tape, comprising:
- (a) a rotary transducing means having a scanning head;
- (b) tape driving means for advancing the recording tape in transducing relation to said rotary transducing means at both a normal recording speed where the scanning head scans along a slant track and a relatively higher speed playback search mode where the scanning head transversely crosses a plurality of the slant tracks;
- (c) wobbling means for wobbling during the higher speed playback search mode relative positions of said rotary transducing means and recorded tracks formed on said recording tape in a direction transverse to a scanning direction of the scanning head so as to avoid missing the program search index information;
- and
- (d) an index detecting means connected to said rotary transducing means for deriving the program search index information out of reproduced signals obtained from said rotary transducing means during the higher speed playback search mode.
An index signal detecting system for use in a helical scan type recording apparatus for detecting program search index information recorded on slant tracks of a recording tape, comprising:
- a helical scan rotary transducing means having a scanning head;
- tape driving means for advancing the recording tape to be helically scanned in transducing relation to said rotary transducing means;
- means connected to said tape driving means for driving the recording tape at higher speed than normal recording speed during a search mode when detection of the program search index information on said recording tape is desired, the scanning head transversely crossing a plurality of the slant tracks on each scan during the higher speed search mode;
- wobbling means connected to the means for driving for wobbling said higher speed when searching for the index information during the search mode so as to avoid missing the program search index information;
- and
- index detecting means connected to said rotary transducing means for deriving said program search index information out of reproduced signals obtained from said rotary transducing means during the higher speed search mode.
Dependencies are inferred from the claim text.