Bluetooth Audio Source L2CAP Packet Conversion for Low Latency Streaming
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Solution Overview
Problem
Conventional Bluetooth protocols, such as A2DP, do not support real-time wireless transmission of audio signals to computer devices without established profiles, leading to latency and quality issues.
Innovation Solution
A method using the Bluetooth protocol to convert audio signals into L2CAP data packets, transmitted via RFCOMM or similar protocols, with error concealment and sample rate adaptation, allowing real-time transmission and decoding on computer devices without altering the operating software, using a proprietary audio distribution transport protocol (SADTP) for error-free data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional Bluetooth audio protocols (A2DP) are used for wireless audio transmission, then audio streaming capability is provided, but real-time transmission with dedicated latency cannot be achieved on computer devices without established profiles
Solution Approach 1:
The patent introduces an intermediary protocol layer (RFCOMM or similar protocols with L2CAP access) that bridges the gap between standard Bluetooth audio protocols and computer devices without established audio profiles. This intermediary enables real-time audio transmission by providing a standardized interface that both the audio source and computer device can understand, resolving the compatibility issue while maintaining transmission quality.
Solution Approach 2:
The patent segments the audio transmission protocol into distinct layers: audio data packetization at the source, transmission via L2CAP with RFCOMM or similar protocols, and reassembly/decoding at the destination. This segmentation allows each layer to be optimized independently, enabling real-time transmission with dedicated latency control while maintaining broad device compatibility.
2Reliability
If audio data packets are retransmitted to ensure error-free transmission, then transmission reliability is improved, but latency increases beyond maximum permissible limits
Solution Approach 1:
The patent applies preliminary error concealment actions at the receiving end before actual playback. By preparing backup audio data and error concealment mechanisms in advance, the system can immediately replace erroneous packets without waiting for retransmission, thus maintaining reliability while preventing latency increase beyond permissible limits.
Solution Approach 2:
The patent implements partial retransmission strategy where only critically erroneous packets are retransmitted, or retransmission is limited to a predetermined degree. This partial action approach maintains sufficient transmission reliability while capping the latency increase within maximum permissible limits for real-time audio.
3Productivity
If standard Bluetooth audio protocols are used, then audio streaming is enabled, but flexibility in audio encoding and decoding is limited
Solution Approach 1:
The patent implements dynamic audio encoding and decoding flexibility by allowing the audio source to package audio data in various formats and the receiving device to adaptively decode and process them. The system can dynamically adjust encoding parameters, sample rates, and decoding strategies based on device capabilities and transmission conditions, providing both productivity and adaptability.
Solution Approach 2:
The patent creates a universal audio transmission framework that can handle multiple audio formats, codecs, and processing requirements through a single standardized interface. The protocol layer is designed to be multi-functional, supporting various audio encoding schemes while maintaining a consistent transmission mechanism, thus enabling both efficient streaming and encoding flexibility.
Data Source
AI summary
A method for wirelessly transmitting audio signals based on the Bluetooth protocol from a Bluetooth audio source to a computer device (audio sink). An audio signal is converted in the Bluetooth audio source into an audio data packet. The audio data packets are converted into L2CAP data packets in the Bluetooth audio source based on a protocol with access to the L2CAP layer, and wirelessly transmitted. The Bluetooth audio source suppresses renewed transmission of L2CAP data packets which were erroneous or which were not received by the sink. Real-time transmission or reproduction of the audio stream or the audio signal can thus be effected. The audio stream or an audio signal on the L2CAP layer may be transmitted with a reduced repetition rate in respect of erroneous data packets. Access to RFCOMM or another data transport protocol with access to the L2CAP layer can be provided from the application layer.