Digital TV Audio Output Synchronization for External Sound Systems
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Solution Overview
Problem
Digital TVs face synchronization issues between audio and video signals when outputting to external devices due to time differences in processing, making it difficult to achieve synchronized audio and video playback.
Innovation Solution
An audio and video synchronizing apparatus and method that automatically detects external devices connected to a digital TV, determines if they are audio devices, and synchronizes audio signals with video signals by adjusting output paths to ensure synchronized audio and video output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If audio signal is outputted to external audio device through monitor output port of digital TV, then high quality sound is provided through audio processing system, but audio and video are not synchronized due to time difference in processing
Solution Approach 1:
The digital TV performs preliminary actions by detecting external device connection status and determining device types before audio signal output. The system proactively configures audio output paths and applies synchronization processing in advance, rather than reacting to synchronization issues after they occur. This prevents audio-video desynchronization before it affects the user experience.
Solution Approach 2:
The digital TV acts as an intermediary between the audio processing system and the display device. It receives audio signals, processes them through multiple paths (including delay processing), and outputs synchronized audio to external devices while coordinating with video output timing. This intermediary role enables the TV to balance high-quality audio processing with video synchronization requirements.
2Manufacturing precision
If digital TV processes digital video signal with large amount of compressed data, then high definition image is achieved, but processing time is relatively long causing audio-video time difference
Solution Approach 1:
The system performs preliminary detection of external device connections and determination of device types before video processing completes. This allows the TV to prepare audio synchronization settings in advance, reducing the overall time loss by having synchronization parameters ready before audio output begins.
Solution Approach 2:
The audio output path is made dynamic and adjustable. The system can switch between different audio processing paths (direct output, delay processing, synchronization processing) based on real-time detection of external device connections. This dynamic adaptation allows the system to optimize processing time while maintaining image quality.
3Reliability
If audio processing is delayed for certain period to synchronize with video, then audio-video synchronization is achieved, but it is difficult to set exact delay period due to variations in digital TVs and audio devices
Solution Approach 1:
The digital TV performs self-service by automatically detecting external device connections, determining device types, and configuring appropriate audio output paths without user intervention. The system self-adjusts synchronization settings based on detected device characteristics, eliminating the need for users to manually set complex delay parameters. This automation resolves the contradiction by making the system intelligent enough to handle the complexity internally.
Data Source
AI summary
Provided is an audio video synchronizing apparatus and method in a video processing equipment. It is detected whether or not an external device connected to an audio/video output port of the video processing equipment is an audio system, and an audio signal synchronized with a video signal outputted to a display device of the video processing equipment is provided to the audio system through an audio output port when the detection result shows that the external device is the audio system. Accordingly, a vide signal on a screen is synchronized with an audio signal outputted from the audio system.