Apparatus and method for controlling recording and reproduction in digital video cassette tape recorder
DCFirst 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.
20 Citations
52 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 controlling recording in a digital video recording device, comprising:
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an input unit receiving digital video data, the digital video data including I-frames of intra-coded digital picture data;
a data generating circuit generating a plurality of relative position data, each of the plurality of relative position data associated with one of a plurality of specific data in the received digital video data, wherein the specific data includes the intra-coded digital picture data, and wherein each of the plurality of relative position data is indicative of a plurality of relative positions from a current nth specific data location on a digital recording medium to each of a n+1, n+2, . . . , n+m specific data location on the digital recording medium, where m is greater than 2; and
a recording unit coupled to the data generating circuit and recording the digital video data and the plurality of relative position data on the digital recording medium such that each specific data includes the associated relative position data, as well as the intra-coded digital picture data. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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31. An apparatus for controlling reproduction in a digital video reproducing device, comprising:
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a reproducing unit reproducing digital video data, the digital video data including I-frames of intra-coded digital picture data stored on a digital recording medium, the digital data including a plurality of specific data, each of said plurality of specific data including relative position data and intra-coded digital picture data, each relative position data indicative of a plurality of relative positions from a current nth specific data location on a digital recording medium to each of a n+1, n+2, . . . , n+m specific data location on the digital recording medium, where 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 based on the detected relative position data and the command. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38)
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39. A method for controlling recording in a digital video recording device, comprising the steps of:
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receiving digital video data, the digital video data including I-frames of intra-coded digital picture data;
generating a plurality of relative position data, each of the plurality of relative position data associated with one of a plurality of specific data in the received digital video data, wherein the specific data includes the intra-coded digital picture data, and wherein each of the plurality of relative position data is indicative of a plurality of relative positions from a current nth specific data location on a digital recording medium to each of a n+1, n+2, . . . , n+m specific data location on the digital recording medium, where m is greater than 2; and
recording the digital video data and the plurality of relative position data on the digital medium such that each specific data includes the associated relative position data, as well as the intra-coded digital picture data. - View Dependent Claims (40, 41, 42, 43, 44, 45)
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46. A method for controlling reproduction in a digital video reproducing device, comprising the steps of:
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reproducing digital video data, the digital video data including I-frames of intra-coded digital picture data stored on a digital recording medium, the digital video data including a plurality of specific data, each of said plurality of specific data including relative position data and intra-coded digital picture data, each relative position data indicative of a plurality of relative positions from a current nth specific data location on a digital recording medium to each of a n+1, n+2, . . . , n+m specific data location on the digital recording medium, where m is greater than 2;
detecting one of the plurality of relative position data from the reproduced digital video data;
receiving a command; and
reproducing at least another specific data based on the detected relative position data and the command. - View Dependent Claims (47, 48, 49, 50, 51)
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52. A digital video recording medium having a data structure for controlling a reproducing operation, comprising:
a plurality of specific data areas, each specific data area storing digital specific data including intra-coded digital picture data and associated relative position data, the associated relative position data indicative of a plurality of relative positions from a current nth specific data location on the digital video recording medium to each of a n+1, n+2, . . . , n+m specific data location on the digital video recording medium, where m is greater than 2.
Specification