Multi-Channel BLE Audio Transmission Using Parallel Frequency Links
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Solution Overview
Problem
The existing Bluetooth Low Energy (BLE) audio technology is limited by a maximum transmission rate of 2 Mbps, which restricts the improvement of wireless multi-channel audio quality, increases latency, and limits the number of channels, especially affecting high-quality surround sound systems like 5.1 or 7.1 speakers.
Innovation Solution
A wireless multi-channel audio transmission method that divides audio data into multiple groups and transmits them in parallel using different frequencies through multiple transmission modules, employing frequency division multiplexing and spatial diversity to enhance bandwidth, reduce delay, and increase reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the transmission rate of BLE audio is improved by reducing symbol period of GFSK modulation, then the transmission rate increases, but the influence of multipath interference increases and long-distance wireless transmission performance deteriorates
Solution Approach 1:
The audio data stream is segmented into multiple independent channels, each transmitted through a separate BLE connection with its own symbol period and modulation parameters. This allows each channel to be optimized independently, with some channels using longer symbol periods for reliability while others use shorter symbol periods for higher data rates.
Solution Approach 2:
The patent transitions from single-channel time-division multiplexing to multi-channel frequency-division-like approach by establishing multiple parallel BLE connections. Each connection operates in a separate communication dimension, allowing simultaneous transmission with different modulation parameters without interfering with each other.
2Speed
If differential phase shift keying modulation with the same symbol period is used, then the transmission rate improves, but the power consumption increases
Solution Approach 1:
Different BLE connections are assigned different modulation schemes based on their specific requirements. Some connections use simpler GFSK modulation for power-efficient transmission of less critical audio channels, while others use more sophisticated differential phase shift keying for channels requiring higher data rates, optimizing the overall power-performance balance.
3Speed
If multicarrier modulation technology is used, then the transmission rate improves, but the device complexity increases
Solution Approach 1:
Instead of implementing complex multicarrier modulation in a single connection, the patent segments the audio data across multiple simpler BLE connections, each using basic GFSK or differential phase shift keying modulation. This achieves similar bandwidth expansion through parallel connections rather than through complex single-connection modulation, reducing device complexity while maintaining high transmission rates.
4Quantity of substance
If time-division multiplexing is used to transmit multi-channel audio, then the number of channels increases, but the switching time ratio increases and link efficiency decreases
Solution Approach 1:
The patent moves from time-division multiplexing (single time dimension) to parallel multi-connection transmission (adding spatial/connection dimension). Multiple BLE connections transmit different audio channels simultaneously rather than sequentially, eliminating switching overhead and improving link efficiency while supporting more channels.
5Quantity of substance
If the number of channels increases, then the audio quality improves, but the system complexity increases resulting in decreased flexibility and reliability
Solution Approach 1:
The audio system is segmented into multiple independent BLE connections, each handling a subset of audio channels. This modular approach allows the system to scale to more channels by simply adding or configuring connections rather than increasing the complexity of a monolithic system. Each connection can be independently managed, optimized, and failed over, improving flexibility and reliability.
Data Source
AI summary
A wireless multi-channel audio transmission method and a wireless multi-channel audio transmission device are disclosed in the present invention. The wireless multi-channel audio transmission method comprises: dividing the N channels of audio data into M groups of subset channel audio data, wherein each group of subset channel audio data comprises at least one channel of audio data; and transmitting the M groups of subset channel audio data to the M subset channel audio receiving devices through M transmission modules in parallel, wherein each of the transmission modules adopts a different transmitting frequency at the same time, and the transmission modules used for transmitting each group of subset channel audio data are changed according to a preset changing rule. Thus, frequency division multiplexing and spatial diversity are used to improve transmission bandwidth, reduce transmission delay and increase transmission reliability of wireless multi-channel audio transmission.