AV Synchronization via Wireless Latency Feedback
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Solution Overview
Problem
Current AV synchronization between video devices and external speakers is challenging, especially when using wireless communication, as there is no feedback mechanism to report communication latency, leading to manual adjustments and poor synchronization in real-time applications like game mode.
Innovation Solution
A method and apparatus that utilize a controller to determine video and audio delays, along with wireless communication quality, to generate time map information for precise synchronization between video and audio devices, transmitted to ensure synchronized playback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If audio data is transmitted to external speakers via wireless communication, then audio quality is improved, but AV synchronization becomes challenging due to unknown communication latency
Solution Approach 1:
The patent implements a feedback mechanism where the wireless audio device measures communication latency and sends this information back to the video device. The video device then uses this feedback to dynamically adjust video timing, resolving the synchronization issue caused by wireless transmission delay while maintaining audio quality.
Solution Approach 2:
The system dynamically changes the video timing parameter based on measured communication conditions. By adjusting video delay parameters according to real-time latency measurements, the system maintains AV synchronization despite variations in wireless communication performance.
2Loss of time
If a predetermined delay is applied to video signals to preconfigure timing, then AV synchronization can be achieved, but manual adjustment is required and real-time synchronization (e.g., game mode) cannot be maintained
Solution Approach 1:
The system performs self-service by automatically measuring communication latency and adjusting video timing without user intervention. The wireless audio device and video device work together to autonomously maintain synchronization, eliminating the need for manual delay adjustments while supporting real-time modes.
Solution Approach 2:
The patent transitions from static predetermined delays to dynamic timing adjustment. The system continuously adapts video timing parameters based on real-time communication conditions, enabling both standard and real-time game modes without manual intervention.
3Speed
If audio contents are transferred and processed as quickly as possible, then real-time performance is improved, but AV synchronization becomes more challenging when video content needs to be displayed as real-time as possible
Solution Approach 1:
The system uses feedback from latency measurements to coordinate audio and video timing. By knowing the exact communication delay, both audio and video can be processed at maximum speed while maintaining synchronization, as the timing offset is dynamically adjusted based on measured conditions.
Data Source
AI summary
A video device, a wireless audio device and a method for performing audio and video (AV) synchronization between the video device and the wireless audio device are provided. The method includes: utilizing a controller of the video device to determine a video delay of the video device; utilizing the controller to determine an audio delay of the video device; utilizing the controller to receive information of a communications quality of the wireless audio device from the wireless audio device, to determine a wireless communications delay between the video device and the wireless audio device according to the communications quality; utilizing the controller to generate a time map information according to the video delay, the audio delay and the wireless communications delay; and transmitting the time map information from the video device to the wireless audio device for AV synchronization between the video device and the wireless audio device.