Analog Video Output Restriction for HD Copyright Protection
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Solution Overview
Problem
Many image display devices with HD resolution capabilities lack HDMI interfaces, leading to potential unauthorized duplication of high-quality image data when transmitting HD images via conventional analog interfaces, which offer poor copyright protection.
Innovation Solution
A video encoding apparatus that converts digital video signals into analog signals, featuring an encoding processor, resolution determination unit, and output controller, which restricts the output of high-resolution analog signals unless the image resolution meets predetermined conditions, preventing unauthorized high-definition signal output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If HD images are transmitted via analog interface to image display devices without HDMI, then compatibility with older display devices is maintained, but copyright protection is weakened and unauthorized duplication becomes possible
Solution Approach 1:
The patent changes the resolution parameter of the analog video signal to prevent unauthorized duplication. The resolution determination unit checks if the digital video signal resolution meets a predetermined condition, and the output controller restricts output or reduces resolution when the condition is not met, thereby protecting copyright while maintaining analog interface compatibility
Solution Approach 2:
The patent introduces an intermediary control system between the digital video signal source and the analog output. The resolution determination unit and output controller act as intermediaries that inspect and regulate the video signal before analog conversion, preventing high-resolution signals from being output without proper authorization
2Reliability
If resolution restriction is implemented in the video encoding apparatus, then copyright protection is enhanced, but device complexity increases due to additional control components
Solution Approach 1:
The patent merges the resolution determination function and output control function into the video encoding apparatus, integrating copyright protection mechanisms with the existing video processing pipeline. This consolidation adds necessary protection capabilities while minimizing the increase in overall device complexity by utilizing the existing apparatus structure
Data Source
AI summary
A video encoding apparatus receives a digital video data signal, converts the digital video data signal into an analog video signal and outputs the analog video signal to an externally connected image device. An encoding processor converts the digital video data signal into the analog video signal. A resolution determination unit compares the resolution of an image represented by the digital video data signal with an externally defined resolution. An output controller refers to a result of comparison by the resolution determination unit and, if the externally defined resolution matches the resolution of the image represented by the digital video data signal, outputs the analog video signal. If the resolutions do not match, the output controller restricts the output of the analog video signal.