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Inaudible transmitter

Discussion in 'General Electronics Discussion' started by virtualcircus, May 17, 2013.

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  1. virtualcircus

    virtualcircus

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    0
    May 17, 2013
    Hi everybody,
    today I discovered Shopkick app which is using 21 KHz sound to deliver digital signal from sensor to smartphone. I would like to try it but I have no experience with digital sound modulation. Is possible to make it via two smartphones? How can be possible to deliver different signals for each store?
    Thanks for any advice.
    Robert
     
  2. davenn

    davenn Moderator

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    Sep 5, 2009
    have you got a reference page link to that app so we can see what you are referring to ? ...

    Dave
     
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