Audio Data Communication System for Reliable Multi-Point Broadcasting
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Solution Overview
Problem
Existing wireless audio broadcasting technologies, such as Bluetooth and WiFi, face challenges with occlusion and interference, leading to unreliable communication and dead spaces, especially in multi-room environments where point-to-multipoint wireless broadcasting is limited by the number of retransmissions.
Innovation Solution
An audio communication system that employs a sound source device broadcasting audio data packets in multiple time blocks within a synchronized broadcast interval, with receiving and forwarding devices retransmitting the packets if not received correctly, ensuring reliable communication by utilizing spatial diversity through multi-point cooperation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Bluetooth CSB or low power Bluetooth BIS is used for point-to-multipoint wireless broadcasting, then wireless audio sharing can be realized, but the communication is easily affected by occlusion and interference, leading to unreliable communication
Solution Approach 1:
The audio data packet is segmented and transmitted through multiple transmitting devices (sound source device and receiving and forwarding devices) simultaneously. Each device transmits the same packet in different time blocks, creating multiple transmission paths that diversify the system against occlusion and interference effects.
Solution Approach 2:
Multiple transmitting devices merge their transmission resources to broadcast the same audio data packet across different spatial locations and time blocks. This combining of transmission efforts creates redundant coverage areas that compensate for occlusion and interference in any single path.
2Reliability
If the number of retransmissions is limited in Bluetooth CSB and BIS, then network topology and communication distance constraints are addressed, but reliable communication cannot be achieved in multi-room environments
Solution Approach 1:
The system performs preliminary action by having receiving and forwarding devices ready to receive and retransmit audio packets within the same broadcast interval. This pre-positioned redundancy ensures that if the sound source device's transmission is blocked, the forwarding devices can immediately provide alternative transmission paths without requiring additional retransmission cycles.
Solution Approach 2:
The system maintains continuity of useful action by enabling multiple transmitting devices to broadcast audio packets continuously within the same broadcast interval across different time blocks. This continuous multi-point transmission ensures uninterrupted audio delivery even when individual transmission paths are blocked.
3Area of stationary object
If audio data is transmitted only from the sound source device, then the broadcast interval structure is simple, but dead spaces are created where devices cannot reliably receive the broadcast audio data
Solution Approach 1:
The system adds a spatial dimension to the transmission by deploying receiving and forwarding devices at different physical locations. These devices transmit audio packets from different spatial positions, creating overlapping coverage areas that eliminate dead zones and ensure reliable reception throughout the entire service area.
Solution Approach 2:
Different transmitting devices provide localized transmission quality optimized for their respective coverage areas. Each device transmits audio packets in specific time blocks, creating locally optimized coverage zones that collectively provide uniform reliable coverage across the entire multi-room environment.
Data Source
AI summary
Techniques for broadcasting audio data from one device to multiple devices are described. A sound source device is configured for broadcasting audio data on a plurality of first time blocks in a first broadcast interval, and, one or more receiving and forwarding devices are configured for receiving the audio data from the sound source device and/or other receiving and forwarding devices on one or more second time blocks in a second broadcast interval, where the receiving and forwarding devices forward the audio data on one or more third time blocks in the second broadcast interval after the audio data packet is received correctly. The first broadcast interval is synchronously aligned with the second broadcast interval, and the aligned first and second broadcast intervals are used to transmit the same audio data. Thereby, reliable audio data communication from one point to multiple points can be realized.