Short-Range Wireless Audio Synchronization via Force Delay
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Solution Overview
Problem
In wireless communication systems, particularly with Bluetooth technology, there is a challenge in synchronizing the audio data output timings across devices in short-range wireless communication, especially when devices lack a display or user interface, leading to complexity in connection management and disconnection processes.
Innovation Solution
A method and apparatus for transmitting audio data using a third device in a short-range wireless communication system, where a first advertisement message provides a broadcast audio data streaming service, and a second advertisement message includes force delay information to synchronize the audio data output timing across devices, ensuring that each device outputs audio data based on this timing, regardless of its processing completion status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If advertisement messages are transmitted to provide broadcast audio data streaming service, then audio data transmission capability is improved, but device complexity increases due to connection management requirements
Solution Approach 1:
The system enables devices to automatically discover and connect to audio streaming services through broadcast advertisement messages. Devices autonomously scan for advertisements, interpret service information, and establish connections without requiring manual user configuration or complex management interfaces, thus reducing device complexity while maintaining transmission capability
Solution Approach 2:
Advertisement messages serve as an intermediary mechanism that carries service discovery information between transmitting and receiving devices. This intermediary layer simplifies the direct connection management by pre-negotiating service parameters and availability through standardized advertisement protocols, reducing the complexity of real-time connection establishment
2Area of stationary object
If audio data is transmitted to multiple devices simultaneously, then service coverage is improved, but synchronization difficulty increases due to varying processing times
Solution Approach 1:
The system incorporates timing feedback mechanisms where receiving devices report their audio data processing completion status and output timing information back to the transmitting device. The transmitting device uses this feedback to calculate and broadcast force delay values that synchronize audio output across multiple devices, enabling coordinated playback despite varying processing speeds
Solution Approach 2:
The transmitting device performs preliminary timing calculations and determines force delay values before audio data transmission. By pre-computing the required delay adjustments based on expected processing times and device capabilities, the system establishes synchronization parameters in advance, making it easier to coordinate multi-device audio output without real-time synchronization complexity
3Reliability
If force delay information is used to synchronize audio output timing, then audio synchronization is improved, but processing time requirements increase
Solution Approach 1:
The system dynamically adjusts the force delay parameter based on device-specific processing capabilities and current audio data characteristics. By changing the delay parameter adaptively rather than using a fixed value, the system achieves reliable synchronization across devices with different processing speeds while minimizing the actual time penalty imposed by delay buffering
Data Source
AI summary
The present disclosure relates to a method by which a third device transmits audio data in a short-range wireless communication system, and to an apparatus therefor. According to the present specification, the method by which a third device transmits audio data in a short-range wireless communication system comprises the steps of: transmitting, to at least one device, a first advertisement message for providing a broadcast audio data streaming service; transmitting, to the at least one device, a second advertisement message related to synchronization of an audio data output time point, wherein the second advertisement message includes force delay information for synchronizing a time point at which the audio data is output from each of the at least one device; and transmitting the audio data to the at least one device, wherein the time point at which the audio data is output from each of the at least one device is determined on the basis of the force delay information.