Apparatus and method for controlling recording and reproduction in digital recording medium
First Claim
1. An apparatus for controlling recording and reproducing in a video cassette tape recorder comprising:
- frame extracting means for buffering compressed digital data input thereto, and extracting specific data for a speed-varied reproduction from said compressed digital data;
frame recording position controlling means for calculating a number of tracks for recording the compressed digital data and selectively outputting a buffered output, said extracted specific data from said frame extracting means, and a multiplexing timing signal;
frame position information recording means for recording position information of specific tracks for the speed-varied reproduction and index information on a magnetic tape, based on said multiplexing timing signal;
digital recording means for recording digital signals including said digital data and said index information on said magnetic tape;
digital reproduction means for reproducing the digital signals recorded on the magnetic tape;
frame position information detecting means for detecting said position information of the specific tracks for the speed-varied reproducing and said index information;
tape speed controlling means for controlling the speed of a capstan motor, based on said detected index information and said position information of the specific tracks; and
frame removing means for receiving an output from the digital reproduction means and removing unnecessary bit streams from the specific data.
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Abstract
An apparatus and method for controlling recording and reproduction in a video cassette tape recorder are disclosed. The apparatus is capable of, in a recording mode, separating specific data for speed-varied reproduction from compressed digital video signals, recording them on designated tracks, recording position information of the designated tracks on a control track by an index head or recording position information of recording position-synchronized blocks at the starting portions of the designated tracks recorded with the specific data, and in a speed-varied reproduction mode, controlling a capstan servo speed so as to maintain the travel of a magnetic tape at a normal speed and periodically or non-periodically accelerate or decelerate it where specific data for varied-speed have been recorded periodically or non-periodically on predetermined portions of tracks, thereby making heads travel repeatedly at the normal speed and the high speed and thereby detect continuously the specific tracks for varied-speed. A repeatability of reproduced video at a varied speed is obtained without any deterioration in picture quality, because of recording of the specific data for speed-varied reproduction and the continuous detection of the specific data in the speed-varied reproduction.
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Citations
34 Claims
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1. An apparatus for controlling recording and reproducing in a video cassette tape recorder comprising:
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frame extracting means for buffering compressed digital data input thereto, and extracting specific data for a speed-varied reproduction from said compressed digital data;
frame recording position controlling means for calculating a number of tracks for recording the compressed digital data and selectively outputting a buffered output, said extracted specific data from said frame extracting means, and a multiplexing timing signal;
frame position information recording means for recording position information of specific tracks for the speed-varied reproduction and index information on a magnetic tape, based on said multiplexing timing signal;
digital recording means for recording digital signals including said digital data and said index information on said magnetic tape;
digital reproduction means for reproducing the digital signals recorded on the magnetic tape;
frame position information detecting means for detecting said position information of the specific tracks for the speed-varied reproducing and said index information;
tape speed controlling means for controlling the speed of a capstan motor, based on said detected index information and said position information of the specific tracks; and
frame removing means for receiving an output from the digital reproduction means and removing unnecessary bit streams from the specific data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for controlling recording in a video cassette tape recorder comprising:
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frame extracting means for receiving compressed digital data input thereto and extracting specific data for a speed-varied reproduction from said compressed digital data;
frame recording position controlling means for generating a multiplexing timing signal and multiplexing said compressed digital data and said extracted specific data from said frame extracting means based on said multiplexing timing signal;
frame position information recording means for recording index information and position information of specific tracks for recording said specific data for the speed-varied reproduction on a magnetic tape based on said multiplexing timing signal; and
digital recording means for recording digital signals including said digital data and specific data from said frame recording position controlling means on the magnetic tape. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method for controlling recording and reproduction in a video cassette tape recorder, comprising the steps of:
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extracting specific data for a speed varied reproduction from compressed digital data;
calculating a number of tracks for recording said digital data and outputting a multiplexing timing signal based on said calculated number of tracks;
recording position information of specific tracks for the speed varied reproduction and index information on a magnetic tape based on said multiplexing timing signal;
recording digital signals including said digital data and said index information on the magnetic tape;
reproducing said digital signals recorded on the magnetic tape;
detecting said position information of the specific tracks for the speed varied reproduction and said index information;
controlling the speed of a capstan motor based on said detected index information and position information of the specific tracks; and
removing unnecessary bit streams from said specific data. - View Dependent Claims (20)
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21. A method of controlling recording in a video cassette tape recorder, comprising the steps of:
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extracting specific data for a speed-varied reproduction from compressed digital data;
generating a multiplexing timing signal and multiplexing said compressed digital data and said extracted specific data based on said multiplexing timing signal;
recording index information and position information of specific tracks for recording said specific data for the speed-varied reproduction on a magnetic tape based on said multiplexing timing signal; and
recording digital signals including said multiplexed digital data and specific data on the magnetic tape. - View Dependent Claims (22)
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23. An apparatus for reproducing digital video data from a digital recording medium, said apparatus comprising:
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a reproducing unit reading digital video data from the digital recording medium, the digital video data including;
a plurality of specific data units, each specific data unit including digital specific data including intra-coded digital picture data and header data, wherein the header data includes;
a sync code for indicating a start of the digital specific data;
identification information; and
relative position data associated with the intra-coded digital picture data, wherein the associated relative position data is indicative of a plurality of relative positions from a current nth specific data location on the medium to each of a n+1, n+2, . . . , n+m specific data location on the medium, wherein m is greater than 2;
a detection circuit coupled to the reproducing unit and detecting one of the plurality of relative position data from the reproduced digital video data; and
a control circuit coupled to the detection circuit, receiving a command and controlling the reproducing unit to reproduce at least another specific data unit based on the detected relative position data and the command. - View Dependent Claims (24, 25)
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26. A method for reproducing digital video data from a digital recording medium comprising the steps of:
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reading digital video data from the digital recording medium with a reproducing unit, the digital video data including;
a plurality of specific data units, each specific data unit including digital specific data including intra-coded digital picture data and header data, wherein the header data includes;
a sync code for indicating a start of the digital specific data;
identification information; and
relative position data associated with the intra-coded digital picture data, wherein the associated relative position data is indicative of a plurality of relative positions from a current nth specific data location on the medium to each of a n+1, n+2, . . . , n+m specific data location on the medium, where m is greater than 2;
detecting one of the plurality of relative position data from the read digital video data;
receiving a command; and
controlling the reproducing unit to reproduce at least another specific data unit based on the detected relative position data and the command. - View Dependent Claims (27, 28)
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29. An apparatus for recording digital video data on a digital recording medium, said apparatus comprising:
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an input unit receiving video data;
a data generating circuit generating digital video data, the digital video data including;
a plurality of specific data units, each specific data unit including digital specific data including intra-coded digital picture data and header data, wherein the header data includes;
a sync code for indicating a start of the digital specific data;
identification information; and
relative position data associated with the intra-coded digital picture data, wherein the associated relative position data is indicative of a plurality of relative positions from a current nth specific data location on the medium to each of a n+1, n+2, . . . , n+m specific data location on the medium, where m is greater than 2; and
a recording unit coupled to the data generating circuit and recording the digital video data on the digital recording medium. - View Dependent Claims (30, 31)
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32. A method for recording digital video data on a digital recording medium comprising the steps of:
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receiving video data;
generating digital video data, the digital video data including;
a plurality of specific data units, each specific data unit including digital specific data including intra-coded digital picture data and header data, wherein the header data includes;
a sync code for indicating a start of the digital specific data;
identification information; and
relative position data associated with the intra-coded digital picture data, wherein the associated relative position data is indicative of a plurality of relative positions from a current nth specific data location on the medium to each of a n+1, n+2, . . . , n+m specific data location on the medium, where m is greater than 2; and
recording the digital video data on the digital recording medium. - View Dependent Claims (33, 34)
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Specification