Sub-picture Timing Control in Information Reproducing Devices
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Solution Overview
Problem
In Blu-ray Discs, when a sub-picture of the Async type is displayed alongside a main picture, issues arise if the main picture is rewound or fast-forwarded, as the sub-picture can be displayed at an unexpected reproduction time due to its arbitrary start time, leading to undesired display.
Innovation Solution
An information reproducing apparatus with a displaying device for main and sub-pictures, a storing device for identification numbers, and controlling devices to manage when to store or destroy these numbers based on the main picture's reproduction time points, ensuring the sub-picture is displayed only within its intended range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the stream number of the sub-picture is continuously held in the status register, then the sub-picture can be quickly displayed when needed, but the sub-picture may be displayed at unexpected reproduction time points when the main picture is rewound or fast-forwarded
Solution Approach 1:
The patent changes the state of the stream number parameter in the status register from continuously held to conditionally held. The stream number is cleared when the reproduction time point exceeds the sub-picture display range, and restored when within range, thereby adapting the parameter state to the playback context to prevent incorrect display timing
Solution Approach 2:
The patent implements a feedback mechanism where the reproduction time point is continuously monitored against the sub-picture display range. Based on this feedback comparison, the system automatically clears or restores the stream number in the status register, ensuring the sub-picture display timing remains accurate during rewind or fast-forward operations
2Reliability
If the stream number is cleared when reproduction time point is beyond sub-picture display range, then unexpected display is prevented, but the sub-picture cannot be displayed if needed within the valid range
Solution Approach 1:
The patent makes the stream number storage state dynamic rather than static. The stream number is cleared when the reproduction time point is beyond the sub-picture display range, and automatically restored when the time point returns to the valid range, allowing the system to adapt to playback operations like rewind while maintaining display accuracy
Data Source
AI summary
An information reproducing apparatus (200) is provided with: a displaying device (353) for displaying a main picture and a sub-picture of a first type whose display can be started at a desired reproduction time point; a storing device (355, 360) for storing an identification number of the sub-picture; a first controlling device (354, 359) for destroying the identification number of the sub-picture, if a current reproduction time point of the main picture is beyond a range of reproduction time points in which the sub-picture is to be displayed; and a second controlling device (354, 359) for continuing to store the identification number of the sub-picture, if the current reproduction time point of the main picture is not beyond the range of reproduction time points in which the sub-picture is to be displayed.