Audio Latency Calibration for Synchronized Playback
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Solution Overview
Problem
Existing audio technologies face challenges in achieving accurate audio synchronization due to increased requirements in audio latency calibration, especially in systems with separated master and slave devices.
Innovation Solution
A method for audio latency calibration that calculates latency periods by measuring transmission times across separated master and slave devices using Wi-Fi communication and audio signal pathways, allowing for synchronization adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If audio transmission is implemented between separated master and slave devices, then audio synchronization requirement is improved, but audio latency calibration accuracy deteriorates
Solution Approach 1:
The system performs preliminary latency measurement by transmitting test audio signals between master and slave devices before actual audio playback. The latency calibration module pre-calculates compensation values based on these measurements, allowing accurate synchronization to be achieved in advance rather than during operation
Solution Approach 2:
The system implements feedback mechanisms where the slave device transmits feedback signals to the master device, and the latency calibration module continuously monitors and adjusts timing compensation based on measured latency variations. This closed-loop approach maintains synchronization accuracy despite changing conditions
2Measurement precision
If latency measurement is performed through multiple transmission pathways, then audio latency calibration accuracy is improved, but system complexity increases
Solution Approach 1:
The latency measurement process is segmented into distinct measurement phases and calculation steps. The control module divides the calibration process into sequential operations (transmitting test signals, receiving feedback, calculating latency, determining compensation) that can be executed systematically without overwhelming complexity
Solution Approach 2:
The patent introduces intermediary calibration signals and feedback mechanisms that simplify the measurement process. These intermediary elements act as mediators between the master and slave devices, enabling accurate latency measurement through standardized test procedures rather than direct complex measurements
Data Source
AI summary
An audio latency calibration method is disclosed. A master speaker and a slave speaker are located at a separation distance from each other, and a paring process is performed. As the paring process is completed, multiple latency time period parameters are obtained relating to the master and slave speakers. The latency time period parameters comprise: T1+T2 representing the time that the master speaker sends an audio signal to the slave speaker, T3+T4 representing the time that the audio signal is transmitted from the slave speaker to a microphone of the master speaker, T5 representing the time that a trumpet of the master speaker plays the audio signal and T3′ representing the time that a microphone of the master speaker receives the audio signal. Thus, the way to synchronously play audio signals can be achieved.