DTV and NTSC Caption Logo Superimposition
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Solution Overview
Problem
Conventional digital television broadcast signal receivers find it difficult for users to distinguish between digital TV caption information and NTSC caption information, leading to operational inefficiencies due to the inability to accurately identify and differentiate between these two types of caption data.
Innovation Solution
A digital television broadcast signal receiver is designed with closed caption information detection and extraction means, along with display mechanisms to announce the presence of digital TV or NTSC caption information directly from visual data, allowing users to easily recognize the type of caption information present by superimposing detection logos on the TV program image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the receiver extracts and displays both digital TV caption information and NTSC caption information, then the functionality and versatility of the receiver is improved, but the user cannot distinguish which type of caption information is being displayed
Solution Approach 1:
The patent applies visual differentiation by displaying distinct icon images for digital TV caption information and NTSC caption information. The receiver detects the caption type and presents corresponding visual indicators (different icons) to the user, enabling clear distinction between the two caption formats while maintaining the ability to process both types simultaneously.
2Device complexity
If the receiver displays only caption information without indication of type, then the device complexity is reduced, but the ease of operation deteriorates due to user inability to identify caption type
Solution Approach 1:
The patent introduces an intermediary visual indicator (icon image) that mediates between the internal caption information processing and the user's perception. This icon serves as a communication bridge, conveying the caption type information from the system to the user without adding complex processing or control mechanisms.
3Device complexity
If the receiver relies on program transmission control data to identify caption type, then the detection process is simplified, but the reliability deteriorates when the control data is incorrect
Solution Approach 1:
The patent implements a feedback mechanism where the receiver continuously monitors and detects caption information characteristics, compares them against expected patterns for digital TV and NTSC captions, and adjusts its identification accordingly. This closed-loop detection approach ensures reliable caption type identification even when program transmission control data contains errors.
Data Source
AI summary
In a digital television broadcast signal receiver (TV receiver), when closed caption information of digital TV (DTV-CC) is detected, a DTV-CC logo (first annunciation image) 31 is displayed with superimposing on an image of TV program for announcing that the DTV-CC is included in the digital TV signal, and when closed caption information of NTSC (NTSC-CC) is detected, an NTSC-CC logo (second annunciation image) 32 is displayed with superimposing on the image of TV program for announcing that the NTSC-CC is included in the digital TV signal. Thus, a user can easily recognize whether the DTV-CC and/or NTSC-CC are/is included in the digital TV signal or not.