to design the electronics to generate ultrasonic carrier wave (anything in MHz range) modulated with a very low frequency wave (say 4.4Hz) and a separate receiver to receive demodulate and filter out the modulating signal (the low frequecy 4.4hz signal) in it.
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Dear I am an expert in electronics . I have many experiences in such works. I am sure I can help you with best quality works. We can discuss about details via chat. I wait for you now. Thanks.
Hi, I am kahan, i am electronic engineer and i have much experienced in hardware and software side, i can make this as per your description. Waiting for further discussion. Thank you.