Audio Stream Detection During Concurrent Wireless Playback
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Solution Overview
Problem
Existing wireless audio transmission systems face challenges in enabling the reception of an audio stream while simultaneously searching for another audio stream due to the asynchronous nature of frequency hopping synchronization packets, leading to potential collisions and reduced audio quality.
Innovation Solution
The audio receiver device scans for frequency hopping synchronization packets in a manner that prevents collisions with audio packet slots, allowing for the reception of at least one audio packet per frame, thereby maintaining acceptable audio quality during the detection of additional audio streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the audio receiver device scans for FHS packets from a second audio streaming device, then the ability to detect additional audio streams is improved, but collisions with audio packet slots occur leading to degraded audio quality
Solution Approach 1:
The scanning operation is segmented into discrete scan windows that are separated from audio packet reception slots. The scan windows are positioned in time and frequency such that they do not overlap with audio packet transmissions, allowing the device to scan for FHS packets from second audio streaming devices without interfering with audio packet reception from the first audio streaming device.
Solution Approach 2:
The scan window periodicity is made dynamically adjustable and is set to be different from the audio packet transmission periodicity. This dynamic parameter adjustment ensures that scan windows and audio packet slots remain asynchronous, preventing systematic collisions while allowing the device to maintain both scanning and audio reception functions simultaneously.
2Difficulty of detecting and measuring
If scan windows are positioned asynchronously relative to audio packet slots, then detection of FHS packets is improved, but audio packet reception may be missed
Solution Approach 1:
Different time-frequency regions are assigned different functions: scan windows are positioned in specific time-frequency locations optimized for detecting FHS packets, while audio packet slots are positioned in separate time-frequency locations optimized for audio reception. This local specialization ensures that each function operates in its optimal conditions without interfering with the other.
Solution Approach 2:
Both scan windows and audio packet transmissions operate periodically, but with different periodicities. The scan window periodicity is deliberately set to be different from the audio packet transmission periodicity, creating an asynchronous periodic pattern that ensures scan windows will eventually align with FHS packet transmissions while maintaining reliable audio packet reception in dedicated slots.
Data Source
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AI summary
There is provided an audio transmission method, comprising: wirelessly connecting an audio receiver device (10) to a first audio streaming device (11); transmitting a first audio stream from the first audio streaming device using a first protocol to the audio receiver device, wherein at least one audio data packet is transmitted in each frame in at least one audio packet slot; and scanning, by the audio receiver device, while receiving the first audio stream from the first audio streaming device, during at least one scan window (S) for frequency hopping synchronization (FHS) packets (F) transmitted from a second audio streaming device (40) in a second audio stream using a second protocol. The scanning activity enables reception of at least one audio packet per frame of the first audio stream by preventing collision of the at least one scan window with at least one audio packet slot (A) per frame (R).