Apparatus and method for recording or reproducing digital data using 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, the method includes receiving digital data, the digital data including video data compressed as at least one of intra-frame and predictive frame, stuffing data, synchronous signals, and relative position information associated with an I-frame; detecting the synchronous signals for decoding the video data; 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, the synchronous signals, and a result of the step of determining whether the speed-varied reproduction mode is selected.
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Citations
27 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, synchronous signals, 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; detecting the synchronous signals for decoding the video data; 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, the synchronous signals, and a result of the step of determining whether the speed-varied reproduction mode is selected. - View Dependent Claims (24, 25, 26, 27)
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Specification