Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Patent
1995-05-25
1998-03-03
Au, Amelia
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
386 96, H04N 576
Patent
active
057244740
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a digital recording and reproducing apparatus and an index recording method which, for example, can easily perform an edition or the like and can prevent a disturbance of an audio system.
BACKGROUND
A development of a digital VCR for digitizing video data and recording it onto a magnetic tape is being progressed. Since a transmission band of digital video data is extremely wide, the digital video data is subjected to, for example, a DCT conversion or the like and, after that, the data is recorded onto the magnetic tape.
An index for a head search of a program is provided for a tape which is used in the above-mentioned digital VCR. The index is recorded in another area together with image data and audio data upon recording. A start point of the recording can be retrieved by a searching operation by using such an index. Since the index is recorded in the other area different from the areas of the image data and audio data, the index can be after-recorded or can be erased later. Therefore, a marking or the like of not only a start point of the actual recording but also a desired point can be performed.
The same signal is used for the index indicative of the foregoing recording start point and the index for marking. Consequently, those signals cannot be distinguished. For instance, in spite of the fact that the user wants to search a head of a certain program, the search is stopped at every point at which the index for marking was recorded. The user has to confirm an image every time and repeat the searching operation.
In case of photographing by a camera integrated type VTR which can perform such an index recording, when the camera integrated type VTR is carried or it is set to a standby mode or the like, there is a case such that the mode is erroneously set to a recording mode and a video image is recorded independent of the user's will. Since a vain photographing is executed for such a period of time, the tape has to be returned to an original recording start position.
When an audio after-recording is performed, further, the recording is ordinarily performed a plurality of number of times. At this time as well, for example, a counter is reset and when the recording is failed, the tape is rewound to such a reset point. Actually, however, the tape is not accurately returned to the reset point noise sounds remain. At the time of the rerecording, therefore, the tape is rewound to a point that is slightly preceding from the original start point, the recording is started, a no-sound period is provided, and after the data which had been recorded before was erased, the recording is again performed. As mentioned above, the operations are complicated in case of performing the audio after-recording.
It is, therefore, an object of the invention to provide a digital recording and reproducing apparatus and an index recording method which can clearly distinguish a start position of a program and other points and can easily record an image or sounds again.
DISCLOSURE OF INVENTION
According to the invention, there is provided a digital recording and reproducing apparatus in which at least a first area for recording an image signal and a second area for recording an audio signal are provided on a recording medium and the image signal and audio signal which were digitized are separately recorded in those areas, respectively, characterized in that the apparatus comprises means for recording image annexed information annexed to the image signal into a third area provided in the first area and means for recording audio annexed information annexed to the audio signal into a fourth area provided in the second area and that recording start identification information is recorded in the third and fourth areas for only a predetermined period of time after the recording was started.
According to the invention, there is also provided an index recording method of a digital recording and reproducing apparatus in which at least a first area for recording an image signal and a second area for
REFERENCES:
patent: 4872068 (1989-10-01), Ishii et al.
patent: 5355229 (1994-10-01), Arano et al.
patent: 5390027 (1995-02-01), Henmi et al.
patent: 5513010 (1996-04-01), Kori et al.
Iizuka Ken
Oguro Masaki
Au Amelia
Din Luanne P.
Frommer William S.
Sinderbrand Alvin
Sony Corporation
LandOfFree
Digital recording and reproducing apparatus and index recording does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital recording and reproducing apparatus and index recording , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital recording and reproducing apparatus and index recording will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2256848