Data stream multiplexing apparatus and method and record medium therefor
First Claim
1. A data stream multiplexing apparatus, comprising:
- stream a modifying means for producing modified sub-picture data stream from a sub picture data stream where a first sub-picture data unit containing pixel data forming a sub-picture image with a preset display time period is located along a time axis by additionally locating at least one of a second sub-picture data unit having almost the same contents as the first sub-picture data unit within the display time period of the first sub-picture data unit on the sub-picture data stream; and
multiplexing means responsive to said modified sub-picture data stream produced by the stream modifying means and other data streams reproduced in synchronous with the modified sub-picture data stream, for multiplexing these streams after packetizing them by a prescribed length.
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Abstract
A data stream multiplexing apparatus having a stream modifier for producing modified sub-picture data stream from a sub picture data stream where a first sub-picture data unit containing pixel data forming a sub-picture image with a preset display time period is located along a time axis by additionally locating at least one of second sub-picture data unit having almost same contents as the first sub-picture data unit within the display time period of the first sub-picture data unit on the sub-picture data stream, and a multiplexer responsive to input modified sub-picture data stream produced by the stream modifying means and other data streams reproduced in synchronous with the modified sub-picture data stream, for multiplexing these streams after packetizing them by a prescribed length.
31 Citations
18 Claims
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1. A data stream multiplexing apparatus, comprising:
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stream a modifying means for producing modified sub-picture data stream from a sub picture data stream where a first sub-picture data unit containing pixel data forming a sub-picture image with a preset display time period is located along a time axis by additionally locating at least one of a second sub-picture data unit having almost the same contents as the first sub-picture data unit within the display time period of the first sub-picture data unit on the sub-picture data stream; and multiplexing means responsive to said modified sub-picture data stream produced by the stream modifying means and other data streams reproduced in synchronous with the modified sub-picture data stream, for multiplexing these streams after packetizing them by a prescribed length. - View Dependent Claims (2, 3, 4)
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5. A data stream multiplexing apparatus, comprising:
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separating means responsive to input sub-picture data streams along a time axis with first sub-picture data unit having pixel data forming the sub-picture image with a preset display time period and control data for controlling the display of the sub-picture image in accordance with a display time, for separating the pixel data and the control data; control data splitting means for splitting the control data units separated by the separating means; stream a modifying means for producing modified sub-picture data stream from a sub-picture data stream where a first sub-picture data unit containing pixel data forming a sub-picture image with a preset display time period is located along a time axis by additionally locating at least one of second sub-picture data unit having almost the same contents as the first sub-picture data unit within the display time period of the first sub-picture data unit on the sub-picture data stream; and multiplexing means responsive to input modified sub-picture data stream produced by the stream modifying means and other data streams reproduced in synchronous with the modified sub-picture data stream, for multiplexing these streams after packetizing them by a prescribed length. - View Dependent Claims (6, 7)
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8. A data stream multiplexing method, comprising the steps of:
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producing a modified sub-picture data stream from a sub-picture data stream along a time axis with a first sub-picture data unit containing pixel data forming a sub-picture image with a preset display time period by additionally locating at least one of second sub-picture data units having almost the same contents as the first sub-picture data unit within the display time period of the first sub-picture data unit on the sub-picture data stream; and multiplexing the modified sub-picture data streams and other data streams reproduced in synchronous with the modified sub-picture data stream after packetizing them by a prescribed length. - View Dependent Claims (9, 10, 11)
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12. A data stream multiplexing method, comprising the steps of:
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separating the pixel data and the control data, in response to input sub-picture data streams located along its time axis with first sub-picture data unit having pixel data forming the sub-picture image with a preset display time period and control data for controlling the display of the sub-picture image in accordance with a display time; splitting the separated control data into units; coupling the control data units with the pixel data to form some second sub-picture data units; producing a modified sub-picture data streams from a sub-picture data stream where a first sub-picture data unit containing pixel data forming a sub-picture image with a preset display time period is located along a time axis by additionally locating at least one of a second sub-picture data unit have almost the same contents as the first sub-picture data unit within the display time period of the first sub-picture data unit on the sub-picture data stream; and multiplexing the modified sub-picture data streams with other data streams reproduced in synchronous with the modified sub-picture data stream after packetizing them by a prescribed length. - View Dependent Claims (13, 14)
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15. A record medium having a sub-picture data stream recorded along its time axis with sub-picture data units containing pixel data forming a sub-picture image with a preset display time period and other data streams reproducible in synchronous with the sub-picture data stream by multiplexing them after packetizing them by a prescribed length, characterized by that
at least a part of a plurality of consecutive sub-picture data units located on the multiplexed streams by packetizing includes a preceeding first sub-picture data unit and a second sub-picture data unit with packets located in the display time period of the first sub-picture data unit, the first and second sub-picture data units have the same pixel data, and the display time periods are substantially contiguous.
- 16. A record medium having sub-picture data streams recorded along its time axis with first sub-picture data unit having pixel data forming a sub-picture image with a preset display time period and control data for controlling the display of the sub-picture image in accordance with a display time and other data streams reproducible in synchronous with the sub-picture data stream by multiplexing them after packetizing them by a prescribed length, wherein at least a part of a plurality of consecutive sub-picture data units located on the multiplexed streams by packetizing includes a preceeding first sub-picture data unit and a second sub-picture data unit with packets located in the display time period of the first sub-picture data unit, the first and second sub-picture data units have the same pixel data, and the valid time periods of the display time periods are substantially contiguous.
Specification