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CC8531: Design concept of two microphones and one USB dongle receiver

Mohamed Suhaib
Prodigy 40 points
Part Number: CC8531
Other Parts Discussed in Thread: CC8521

Tool/software:

Hello,

I am working on project with two microphones and one USB dongle receiver using CC8531 transceiver. I don't have much experience with audio devices. I have a simple question, To connect two microphones do we really need to have two separate CC8531 receiver at the USB end. I saw some reference design having only CC8531 receiver at USB dongle. What is the mechanism behind the working of such design. And where these two concepts of using two CC8531 receiver or one CC8531 receiver is applicable?

  • 0
    TI__Expert 6381 points

    Hello Mohamed Suhaib,

    I hope you are doing well! Could you link me to the reference design if you happen to have it open? It would make sense to have one CC8531 transmitting to the dongle (if the dongle can support receiving the data) if not it would also make sense to have a CC8531 TX -> CC8531 RX -> Dongle (via serial interface). 

    In either case you will need to match the respective PHYs, and need to have a way of packetization, sending, and processing the data.

    Is there a reason why we want to target the CC8531? Providing your systems requirements can help me understand here.  

    Thanks,
    Alex F

  • 0 in reply to Alex Fager
    Prodigy 40 points

    Hi Alex, The setup is same as you have mentioned "MIC1 (CC8531 TX)- -> (CC8531 RX) USB Dongle (via serial interface).  My question is how can I connect a second 'MIC2 with CC8351 as TX' to the same (CC8531 RX) USB Dongle receiver. What is the working principle, so the two MICs could work without any interference. Is there any default configuration setup in Purepath configurator?

  • 0 in reply to Alex Fager
    Prodigy 40 points

    Below is the example product which has Merged and Split mode. Here, what might be the actual working principle in these two modes. How audio data is combined during RF data reception.

    rode.com/.../wireless-go-ii

  • +1 in reply to Mohamed Suhaib
    TI__Expert 6381 points

    Hello Mohamed,

    Thank you for the link, and I took a look at the description: "'Merged' or 'Split' mode. This allows you to record each transmitter onto separate channels on the output or combine the two into a single output."

    Basically in the merged mode:

    -Mic 1 (device A) will TX at freq A

    -Mic 2 (device B) will also be inputted to the device at freq A

    (this should be possible given you are able to also put the second mics data through device B while device B is receiving singals from device A)

    In split mode:

    -Mic 1 (device A) will TX at freq A

    -Mic 2 (device B) will RX at freq A, but also be inputted to the device at freq B

    (as long as the channels could be ran sonorously this should be possible, however I am not so familiar on the CC8531 as its an older device)
    (however taking a look at the datasheet shows that the CC8521 may not have 2 channels?) 

    Thanks,
    Alex F