Wireless communication using ultrasound generated by MEMS microphone
The first step would be to encode your information(which is basically a bunch of 1s and 0s). Then a modulation scheme(that determines your spectrum efficiency). At the very last, you do pulse shaping and finally you are ready to send your custom created waveform to the CMUT to be transmitted.
This gives an overview of the experimental setup. The Knowles dual membrane microphone is driven as an ultrasonic transmitter. After using the custom modulation waveform as excitation to the CMUT. A PCB microphone( from PCB piezotronics company) is used to recieve the pressure wave signal at ultrasonic frequency.
Due to the storage limitation of the arbitrary wave generator. Here the image on the left is compressed to the image on the right for creating the modulation signal.
After the CMUT send the modulated pressure wave. The microphone picks up the signal.
The sent data plot together with the demodulated pressure signal.
Now the longhorn image sent using ultrasound is fully recovered by demodulation of the received pressure signal!