Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1998-11-27
2001-02-20
Chevalier, Robert (Department: 2715)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C386S349000
Reexamination Certificate
active
06192182
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a digital information signal recording apparatus for recording for example a digital video signal to a record medium and to a method thereof.
BACKGROUND ART
A signal processing apparatus that digitally processes a video signal (for example, a signal processing apparatus used for a digital VTR (Video Tape Recorder) that records/reproduces a high resolution video signal) compresses and encodes an input video signal. The compressed and encoded video signal is recorded to for example a video tape. To record/reproduce record data at a high data rate, a helical scan type recording/reproducing apparatus of which a magnetic tape is diagonally wound around a rotating drum and magnetic heads are disposed on the rotating drum is known. This apparatus successively records data in such a manner that diagonal tracks are formed on the magnetic tape.
When record data composed of a digital video signal and so forth is recorded on a tape, auxiliary data necessary for recording/reproducing data is also recorded. The record data is normally delimited in each data unit. In the following description, the data unit is referred to as sync block. The auxiliary data is position information on the tape (for example, time code) and information necessary for recording/reproducing process. The auxiliary data is structured as sync block and recorded on the tape. Many sync blocks are recorded on one track. One of sync blocks recorded on each track is assigned to auxiliary data. A sync block composed of auxiliary data is referred to as auxiliary data sync block.
In the conventional digital VTR, an auxiliary data sync block is recorded at the same position of each track. Thus, when a tape is scratched in the traveling direction thereof (namely, in the longitudinal direction), a situation of which auxiliary data cannot be reproduced at all sometimes takes place. Such a recording method is suitable for recording data such as a time code, for example, that is what the same contents are redundantly recorded on another track (longitudinal track). However, that method is not suitable for recording an auxiliary data that is necessary information for the reproducing process, because the reliability is very low.
DISCLOSURE OF INVENTION
Therefore, an object of the present invention is to provide a digital information signal recording apparatus for alleviating the situation of which a scratch on a tape prevents an auxiliary data sync block from being reproduced and a method thereof.
A first aspect of the present invention is a digital information signal recording apparatus for recording a digital information signal onto diagonal tracks of a tape shaped recording medium, comprising forming means of record-signal for encoding an input digital information signal with an error correction code and forming record data delimited by a predetermined data unit, and a recording means for successively recording record-data onto diagonal tracks of a tape shaped recording medium, wherein the forming means of record-signal forms a plurality of data units composed of encoded data of the input digital information signal and at least one data unit composed of auxiliary data other than the input digital information signal in the shape of record-data on one track, and wherein the record-data on one track is formed in such a manner that data units composed of the auxiliary data are recorded apart each other on the recording medium.
A second aspect of the present invention is a digital information signal recording method for recording a digital information signal onto diagonal tracks of a tape shaped recording medium, comprising the steps of encoding an input digital information signal with an error correction code and forming record-data delimited by a predetermined data unit, and successively recording record-data onto diagonal tracks of a tape shaped recording medium, wherein a plurality of data units composed of encoded data of the input digital information signal and at least one data unit composed of auxiliary data other than the input digital information signal are formed in the shape of record-data on one track, and wherein the record-data is formed in such a manner that data units composed of the auxiliary data are recorded apart each other on the recording medium.
Since record positions of data units composed of auxiliary data are spaced in the width direction of the tape shaped recording medium, even if the tape is scratched, a situation of which auxiliary data cannot be reproduced can be prevented.
REFERENCES:
patent: 5282049 (1994-01-01), Hatakenaka et al.
patent: 5377051 (1994-12-01), Lane et al.
Kawahara Minoru
Kosuge Shoji
Yamasaki Kenji
Chevalier Robert
Frommer William S.
Frommer Lawrence & Haug LLP.
Kessler Gordon
Sony Corporation
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