Subtitle-Based Playback Point Control for Digital TV Search
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Solution Overview
Problem
Conventional methods for changing the playback point in digital TV services, such as IPTV and smart TV, face issues like inconsistent and irregular changes due to fixed search sync values, leading to interruptions during conversations and difficulties in language learning applications.
Innovation Solution
A display device with a control unit that changes the playback point based on subtitle units, adjusting the reference time according to inter-subtitle intervals, allowing precise control using remote control keys and a progress bar, and offering modes for subtitle search or general search to minimize interruptions and facilitate language learning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the playback point moves at fixed time interval, then the playback point can be changed consistently, but the playback point may move to a point while the characters in the image are speaking, making it difficult to change the playback point to listen from the beginning of the dialogue
Solution Approach 1:
The patent segments the video content into subtitle-based units, where each subtitle represents a discrete segment of dialogue. By moving the playback point to subtitle boundaries rather than fixed time intervals, the system ensures that playback changes occur at meaningful semantic boundaries, allowing users to listen from the beginning of dialogues without cutting off mid-sentence.
2Device complexity
If a fixed search sync value is used, then the search operation is simple, but the playback location is changed inconsistently and irregularly when searching playback location
Solution Approach 1:
The patent implements a dynamic search sync value that adapts based on the inter-subtitle interval. Instead of using a fixed search sync value, the system adjusts the search sync value to be proportional to the actual time distance between subtitles. This dynamic adjustment ensures consistent and regular playback location changes during search operations, while still maintaining simple user interaction through remote control keys.
3Measurement precision
If the playback point is changed to the start location of the subtitle closest to the movement point, then the playback point changes on subtitle unit, but the dialogue starts immediately after changing the playback location, which is inconvenient
Solution Approach 1:
The patent applies preliminary action by adjusting the playback point to a position before the subtitle start location. Instead of moving directly to the subtitle start, the system calculates a pre-adjusted position that accounts for the time needed to reach the actual dialogue start. This preliminary adjustment prevents the inconvenience of dialogue starting immediately after playback location change, giving users adequate time to prepare for language learning activities.
4Speed
If the search sync value is set too large, then the search operation is fast, but a specific subtitle is skipped
Solution Approach 1:
The patent dynamically changes the search sync value parameter based on the inter-subtitle interval. Instead of using a large fixed search sync value that causes subtitles to be skipped, the system adjusts the search sync value to match the actual time distance between subtitles. This parameter adaptation maintains fast search operation speed while ensuring accurate subtitle positioning without skipping.
5Measurement precision
If the search sync value is set too small, then the search operation is precise, but the same subtitle start location is continuously changed
Solution Approach 1:
The patent adjusts the search sync value parameter to be proportional to the inter-subtitle interval rather than using a small fixed value. This parameter change ensures that playback point positioning remains precise while avoiding the inefficiency of continuously changing to the same subtitle start location. The adaptive search sync value maintains both precision and productivity in subtitle-based search operations.
Data Source
AI summary
A display device according to an embodiment of the present disclosure may comprise: a display configured to display an image and a subtitle corresponding to the image; and a control unit configured to receive a search command for changing a playback point of the image, wherein the control unit is further configured to: change the playback point of the image to a subtitle unit according to the search command, and change the playback point differently according to an inter-subtitle interval.