20S Audio Multitasking Needs Cooperative FHSS

Steven Schmidt

1. September 2014 02:56

Sena Engineers;

The 20S Audio Multitasking feature would perform incredbly better if the dual BT modules used a complementary frequency-hopping plan, thereby preventing them from hopping on to the same frequency at the same time. Presently, the dual BT modules do this so often that it renders the feature unusable. Simultaneous intercom and A2DP sessions cause the intercom session to be unstable, often causing it to terminate. The frequency hopping can be heard over the speakers, and perhaps that's a symptom of another related issue, such as insufficient selectivity and sensitivity due to sharing the same antenna. 

Like others on this forum have discovered, the Audio Multitasking, in its present form, is not usable.

Steve Schmidt

 

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  Sena

  3. September 2014 07:18

  Thank you for your sincere feedback. We are studying the optimal set-up for dual Bluetooth continuously, including frequency-hopping mechanism. Could you further explain your suggestion? We really need your sincere suggestions.

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  Steven Schmidt

  3. September 2014 19:02

  I suggest your engineers investigate the Coordinated Co-located Access Point (CCAP) technique for reducing Co-Channel Interference (CCI). Each BT module in the 20S could be the master node of its piconet, and use the CCAP technique to coordinate the hop frequency selection between the two master nodes. Both BT modules should have the same device address (0x0000000) and different predetermined offsets for the clock counter.  See "Robust Coexistence Methods for Frequency Hopped Wireless Networks" by Jingli Li.

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