Conclusions
This case shows the value of Frontline's Audio Expert System. An error in the transmission of an audio stream compressed using aptX was not easily detected in the protocol analysis using frames. While, in this situation with audio streaming between a smartphone and a Bluetooth headset, there was not a significant disruption of the audio, but in playback using other devices there may have been a more significant interruption of the audio streaming.
The smartphone manufacturer may wish to find out why aptX compressed audio contained SBC compressed data in the stream. We can speculate that there may be an underlying problem with clearing stacks or memory between streaming events. This investigation is beyond the scope of this paper.
If there is interest in the Audio Expert System as an expansion of your ComProbe Bluetooth analyzer contact the Frontline sales at sales@fte.com or visit our web site at fte.com.