Apparatus and method for recording or reproducing digital data using timing information and speed information
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 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.Apparatus and method for controlling recording and/or reproduction of digital signals to and/or from a digital storage medium, are discussed. According to an embodiment, there is provided a method for processing a digital signal stored on a digital storage medium, comprising receiving digital data processed based on first timing information and second timing information, the digital data being stuffed by stuffing data capable of being detected and removed, and being processed to prevent at least one of buffer underflow and buffer overflow, wherein the first timing information is multiplexing timing information for a multiplexer, and the second timing information is sync information for video reproduction, and wherein the digital data includes video data; determining whether a speed-varied reproduction mode is selected for reproduction of the video data in a varied speed, the video data compressed as at least one of I-frame and P-frame; and reproducing the video data in a varied speed based on speed information when the speed-varied reproduction mode is selected, the speed-varied reproduction mode being associated with the speed information.
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Citations
29 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. A method for processing a digital signal stored on a digital storage medium, the method performed by at least one device and comprising:
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receiving digital data, wherein the digital data includes video data compressed as at least one of intra-frame and predictive frame, stuffing data capable of being detected and removed, and at least one relative position information associated with an I-frame, wherein the relative position information indicates position information associated with the I-frame relative to position information associated with a current frame;
obtaining the video data from the digital data by removing the stuffing data based on stuffing code information;
determining a position associated with the I-frame by using the relative position information;
determining whether a speed-varied reproduction mode is selected for reproduction of the video data in a varied speed; and
reproducing the video data based on the determined position associated with the I-frame and a result of the step of determining whether the speed-varied reproduction mode is selected. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification