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CC2540/41 as voice transceiver

tim claeys
Prodigy 60 points

Other Parts Discussed in Thread: CC2540, CC2541, CC2510, CC8520

Hello

I want to design a device with the size of a watch that can call to another person who is on a pc several meters away (or via the pc to a SIP server).
the call will be always be an emergency call, so there will not be a lot of calls in a year. as the device is very small i want to use a coin cell battery for this.

my question is can i use the CC2540/41 for this? i want to use this because it can last long on a coin cell battery. 

Regards

Tim Claeys

  • 0
    TI__Guru 57865 points

    Hi Tim,

    Currently (BLEv1.2.1), the maximum measured throughput is around 6kB/s which is not suitable for voice transfer.

    You could however send a "Alert" notification or something like that, with at least 10-100 meters using a integrated PCB or chip antenna. If you'd want longer range, you would have to go with an dipole antenna.

    Best Regards

  • 0 in reply to J Lindh
    Prodigy 60 points

    Hi.

    Could i use the use the proprietary mode in the 2541 to transfer voice? and keep the low power specifications when not in a call?
     

    Regards

  • 0 in reply to tim claeys
    TI__Guru 57865 points

    Hi Tim,

    Yes of course. In fact, using CC2541 completely in proprietary mode,  will be even lower power than using it in Bluetooth low energy mode. But the you'll loose all the good the comes with Bluetooth low energy, such as interoperability with smart phones and so on. You would also have to write the software on your own.

    Best Regards

  • 0 in reply to J Lindh
    Guru 22270 points

    Hello Nick,

    I suppose technically you could send voice, you just couldn't send it in real time.  That is probably not what Tim is looking for. I was thinking of a BLE station where someone could leave a short voice message, state their first name or say a word for authentication or even say their email address.

  • 0 in reply to Greenja
    Prodigy 60 points

    Hi 

    It needs to be real time so  i will probably use the proprietary mode. 
    Is there an example project with proprietary mode available ?

    Regards 

  • 0 in reply to tim claeys
    Guru 22270 points

    You can take a look at the following post.  It has an example of two-way communication.  It may work for you. http://e2e.ti.com/support/low_power_rf/f/156/p/90490/314829.aspx#314829

    Also, Design Note DN402 - Simple Audio Loopback for CC25xx should be helpful. 

    http://www.ti.com/lit/an/swra138/swra138.pdf

  • 0 in reply to Greenja
    Expert 1835 points

    Okay. My silly question is, why not use the CC2510, as there is already plenty of code for audio transmission?

    Ron

  • 0 in reply to ronnym
    TI__Expert 6825 points

    Or have a look at the CC8520 it is made to transmitt wireless audio :-)