Reception Apparatus Alternative Subtitle Synchronization
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Solution Overview
Problem
Existing digital broadcasting systems face challenges in synchronizing video and subtitle streams due to transmission delays, leading to increased processing loads on reception apparatuses, as the delay times for video and subtitle streams via digital broadcasting and networks are not equal.
Innovation Solution
A reception apparatus that uses timing information from broadcast subtitles to synchronize alternative subtitles with video streams, allowing for synchronized output without overloading the apparatus, by acquiring and displaying subtitles in languages not provided by digital broadcasting from a server via a network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PTS-based synchronization processing is implemented to output video and alternative subtitles in sync, then synchronization accuracy is improved, but processing load on reception apparatus increases
Solution Approach 1:
The patent extracts the timing information from broadcast subtitles and uses it directly for synchronizing alternative subtitles, rather than implementing complex PTS-based synchronization processing. This extracts only the essential timing data needed for synchronization while avoiding the heavy processing load of full PTS processing.
Solution Approach 2:
The broadcast subtitle timing information serves dual purposes: it provides the subtitle display timing for broadcast subtitles and simultaneously provides the synchronization timing for alternative subtitles. This self-service approach eliminates the need for separate synchronization processing mechanisms.
2Reliability
If transmission delay compensation is implemented to account for unequal delays in video and subtitle streams, then synchronization reliability is improved, but device complexity increases
Solution Approach 1:
The patent uses broadcast subtitle timing information as an intermediary reference that mediates between the video stream and alternative subtitle stream. This intermediary provides a common timing reference that automatically compensates for transmission delay differences without requiring complex delay measurement and compensation mechanisms.
Solution Approach 2:
The reception apparatus acquires alternative subtitles in advance before the broadcast content is received. This preliminary action allows the subtitles to be ready for immediate synchronization when the broadcast content arrives, eliminating the need for complex real-time delay compensation processing.
Data Source
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AI summary
A reception apparatus includes: a broadcast reception unit (101) receiving broadcast content including a video stream, broadcast subtitles, and timing information, the video stream being composed of a plurality of images output along a time axis, the broadcast subtitles being composed of character strings, the timing information being used to output the broadcast subtitles in synchronization with the images; an alternative subtitle acquisition unit (110) acquiring alternative subtitles prior to reception of the broadcast content, the alternative subtitles being composed of character strings that are alternatives to the character strings constituting the broadcast subtitles in a different representation; an alternative subtitle holding unit (111) holding the acquired alternative subtitles; and the timing control unit (112), an alternative subtitle screen generation unit (115), and an alternative subtitle output unit (116) performing alternative subtitle synchronization processing to output the alternative subtitles at a timing designated with respect to the broadcast subtitles.