Vehicle Controller Synchronizing Wireless Headphone Audio Latency
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Solution Overview
Problem
Vehicle entertainment systems face challenges in synchronizing audio and video streams across multiple wireless headphones due to differing latency delays in unicast wireless connections, making it difficult to provide synchronized viewing and hearing experiences, especially in rear seat entertainment systems where multiple users may have different audio delays.
Innovation Solution
A controller system that establishes paired wireless connections with wireless headphones and video displays, using Bluetooth transceivers to send synchronized audio and video streams, and introduces time delays to match the latency of each connection, allowing for seamless synchronization across all devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If unicast wireless connections are used for multiple wireless headphones, then individual audio streams can be delivered to each headphone, but different latency delays occur in each connection making synchronization difficult
Solution Approach 1:
The system dynamically adjusts the audio stream timing parameters by introducing time delays based on the measured latency of each wireless connection. The controller measures latency for each headphone connection and applies compensating delays to the audio stream before transmission, ensuring synchronization across all headphones despite their individual connection characteristics.
2Reliability
If time delays are introduced to synchronize audio and video streams, then synchronized playback is achieved, but the system complexity increases
Solution Approach 1:
The controller system automatically measures latency for each wireless headphone connection and autonomously calculates the appropriate time delays without requiring manual configuration or user input. The system self-adjusts the audio stream timing based on real-time connection characteristics, reducing the need for complex user interface controls or manual synchronization settings.
Data Source
AI summary
A vehicle entertainment system is for use with wireless headphones, with each wireless headphone being operable via a respective paired wireless connection. The vehicle entertainment system may include video entertainment displays for a vehicle, and a controller for the vehicle. The controller may be configured to establish respective paired wireless connections with the wireless headphones, and provide selectable access to a plurality of different audio/video (A/V) entertainment content streams. Each of the A/V entertainment content streams may include a respective video entertainment stream and an associated audio entertainment stream. The controller may be further configured to send selected video entertainment content streams for viewing at the video entertainment displays, and send selected audio entertainment content streams over the respective paired wireless connections for hearing at the wireless headphones.