Multi-Channel, Multi-Zone Audio Timing for Lip Synchronization
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Solution Overview
Problem
Existing systems struggle to coordinate synchronized playback of audio across multiple zones in a home theater or zone group environment, particularly in relation to video content, leading to issues like lip synchronization and audio delays.
Innovation Solution
A method and system for distributing audio information that includes assigning timestamps for playback by multiple home theater players and zone group players, ensuring synchronized audio playback across different zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If audio information is distributed to multiple zones without timestamp coordination, then each zone can play audio independently, but synchronization between zones deteriorates causing lip synchronization issues
Solution Approach 1:
The system assigns timestamps to audio information before distributing it to multiple zones. This preliminary timestamp assignment ensures that all zones know in advance when to play their audio segments, achieving synchronized playback without requiring complex real-time coordination mechanisms between zones.
2Adaptability or versatility
If audio is played simultaneously across all zones, then synchronization is simplified, but adaptability to different playback environments deteriorates
Solution Approach 1:
The audio information is segmented into multiple channels (home theater channels and zone group channels), allowing different playback configurations. The system can distribute audio to zones as a unified zone group or as individual zones with different playback characteristics, providing flexibility while maintaining manageable system complexity through structured channel separation.
3Measurement precision
If timestamp precision is increased for audio playback, then synchronization accuracy improves, but processing overhead and system complexity increases
Solution Approach 1:
The system uses timestamp values that are copied from the audio information metadata rather than calculating them in real-time. This approach achieves high timing precision by leveraging pre-computed timestamp data embedded in the audio stream, avoiding the need for complex real-time processing while maintaining accurate synchronization.
Data Source
AI summary
A multi-channel and multi-zone audio environment is provided. Various inventions are disclosed that allow playback devices on one or more networks to provide an effective multi-channel and a multi-zone audio environment using timing information. According to one example, timing information is used to coordinate playback devices connected over a low-latency network to provide audio along with a video display. In another example, timing information is used to coordinate playback devices connected over a mesh network to provide audio in one or more zones or zone groups.