Wireless Audio Latency Synchronization via Test Signal Analysis
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Solution Overview
Problem
Bluetooth technology does not support synchronized point-to-multipoint transmission of audio and video streams, making it impossible to synchronize multimedia devices using a single Bluetooth chip, especially when devices from different manufacturers are involved, leading to desynchronization issues that can be perceived by the human ear.
Innovation Solution
A method is introduced to determine latency information in wireless audio systems by transmitting test signals to receivers, acquiring audio records, and calculating latency based on time references, which allows for improved synchronization of audio data transmission across multiple receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Bluetooth A2DP profile is used for audio transmission, then audio quality is improved, but synchronized point-to-multipoint transmission capability is lost
Solution Approach 1:
The system segments the transmission task by using separate communication channels: A2DP profile for high-quality audio transmission and HID profile for latency information exchange. This allows the system to maintain audio quality while enabling synchronization control across multiple devices.
Solution Approach 2:
The patent introduces an intermediary mechanism where the source device acts as a mediator that collects latency information from multiple receivers and adjusts transmission timing accordingly. This intermediary role enables synchronized point-to-multipoint transmission while maintaining A2DP audio quality.
2Adaptability or versatility
If speakers from different manufacturers are connected, then device compatibility is improved, but synchronization capability deteriorates
Solution Approach 1:
The patent implements a universal synchronization mechanism that works across different manufacturer devices. By using standardized Bluetooth profiles (A2DP and HID) and a common latency measurement protocol, the system achieves multi-functionality that works with any Bluetooth-compatible speaker regardless of manufacturer.
Solution Approach 2:
The system dynamically adjusts transmission parameters based on measured latency values from each receiver. By changing the timing parameters of audio packet transmission based on actual device characteristics, the system maintains synchronization reliability across diverse devices from different manufacturers.
3Reliability
If multiple Bluetooth chips are used to control multiple devices, then synchronization control is improved, but device complexity increases
Solution Approach 1:
The source device is designed with multi-functionality, using a single Bluetooth controller that can simultaneously maintain A2DP connections with multiple receivers and exchange HID data for latency information. This universal approach eliminates the need for separate Bluetooth chips while maintaining synchronization control.
Solution Approach 2:
The patent merges the audio transmission function (A2DP) and synchronization control function (HID) into a single Bluetooth communication system. By combining these functions and using the same physical Bluetooth interface for both purposes, the system reduces hardware complexity while maintaining reliable synchronization control.
Data Source
AI summary
The invention relates to a method of determining latency information in a wireless audio system, the wireless audio system comprising at least one wireless receiver, a wireless transmitter and a sound recorder, the method comprising the following steps: transmitting at least one test signal from the wireless transmitter to the wireless receiver, the test signal defining a time reference; playing the test signal at the wireless receiver; acquiring an audio record by the sound recorder while the test signal is played by the wireless receiver; determining, by the sound recorder, a latency information related to the wireless receiver at least based on the time reference and based on the audio record, and the wireless transmitter and the sound recorder being synchronized; transmitting the determined latency information to the wireless transmitter.