True Wireless Earphone Synchronization via Packet Time Difference Feedback
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Solution Overview
Problem
True wireless earphone systems experience synchronization issues due to clock drift, leading to asynchronous playback of music/sound effects, affecting user experience.
Innovation Solution
The system includes a method where one earphone sends and receives packets to another, measuring transmission and reception time differences to determine synchronization state, and adaptively corrects audio play progress to maintain synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the two earphones play music/sound effects based on their respective built-in system clocks, then the initial synchronization is achieved, but clock drift causes asynchronous playback over time
Solution Approach 1:
The patent implements a feedback mechanism where earphones periodically exchange synchronization packets containing timestamp information. Each earphone measures the time difference between receiving a packet and sending a response packet, then uses this feedback to calculate and adjust its playback timing to compensate for clock drift, maintaining synchronization over extended playback durations
Solution Approach 2:
The patent performs preliminary synchronization actions by establishing initial clock synchronization between earphones before playback begins. Additionally, synchronization packets are exchanged at predetermined intervals during playback to proactively detect and correct any drift before it significantly degrades synchronization, rather than waiting for asynchrony to occur
2Measurement precision
If synchronization packets are exchanged frequently to detect clock offset, then synchronization accuracy is improved, but communication overhead and system complexity increase
Solution Approach 1:
The patent employs periodic action by exchanging synchronization packets at fixed time intervals rather than continuously or on-demand. This periodic exchange provides regular updates on clock offset with sufficient precision for maintaining synchronization, while avoiding the excessive communication overhead and system complexity that would result from more frequent or continuous packet exchange
Solution Approach 2:
The patent uses synchronization packets as an intermediary mechanism to indirectly measure clock offset. Instead of directly comparing system clocks which would require complex synchronization protocols, the packets serve as carriers for timestamp information that allows each earphone to calculate the time difference through simple timestamp comparison, reducing system complexity while maintaining measurement precision
Data Source
AI summary
The disclosure provides an earphone synchronization method and a true wireless earphone system. The method includes the following. A first packet is transmitted to a second wireless earphone. The first packet records a first packet transception time difference. A second packet is received from the second wireless earphone. The second packet records a second packet transception time difference. A synchronization state between a first wireless earphone and the second wireless earphone is obtained according to the first packet transception time difference and the second packet transception time difference. A play progress of playing a specific audio by the first wireless earphone or by the second wireless earphone is adaptively corrected according to the synchronization state between the first wireless earphone and the second wireless earphone.