BLE Audio Signal Processing Device Dynamic Retransmission Control
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Solution Overview
Problem
BLE audio is more susceptible to packet loss due to limited retransmissions and reducing data size to maintain quality, whereas Classic audio allows variable retransmissions, leading to inferior sound quality in BLE audio.
Innovation Solution
A signal processing device and learning device that dynamically control packet retransmissions and bitrate based on radio wave state fluctuations, using parameters from receiving devices to optimize transmission quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of retransmissions is kept consistently high in BLE audio, then packet loss is reduced, but the data size of audio packets must be reduced which affects sound quality
Solution Approach 1:
The patent applies dynamics by making the number of retransmissions adjustable rather than fixed. The control unit dynamically changes the number of retransmissions based on real-time radio wave state measurements (RSSI fluctuations), allowing the system to adapt between reliability and quality depending on transmission conditions.
Solution Approach 2:
The patent changes the parameter of retransmission count based on radio wave state. When RSSI fluctuation indicates poor radio conditions, the system increases retransmissions to maintain reliability. When radio conditions are good, the system reduces retransmissions to preserve packet data size and sound quality.
2Stability of the object's composition
If packet transmission is performed at regular intervals in BLE audio, then bandwidth is guaranteed and transmission timing is regular, but the number of retransmissions is limited
Solution Approach 1:
The system maintains the isochronous transmission timing regularity while dynamically adjusting the number of retransmissions allowed within each transmission cycle. This allows the system to preserve the stability of regular transmission intervals while adapting reliability based on actual radio conditions.
3Manufacturing precision
If the data size of audio packets is reduced to maintain quality with high retransmissions, then sound quality is preserved, but transmission efficiency decreases
Solution Approach 1:
The system changes the retransmission parameter based on radio wave state rather than reducing packet data size. When radio conditions are poor (high RSSI fluctuation), the system increases retransmissions with full packet sizes. When conditions are good, the system reduces retransmissions while maintaining full packet sizes, thus preserving both sound quality and transmission efficiency.
Data Source
AI summary
The present technique relates to a signal processing device and a learning device capable of improving playback quality. The signal processing device generates a packet by packetizing encoded data encoded in monaural and separated for channels; transmits, by wireless communication, the packet generated; and controls a number of retransmissions of the packet and a bitrate in accordance with a fluctuation value of a first parameter for estimating a radio wave state, the first parameter being obtained from a receiving device. The present technique can be applied in an audio playback system that plays back audio data.