Ultrasound Data Transmission with Standard Laptops by Chris Christopher

Here's a simple, yet complicated way to transmit data. Very interesting, to me. Since, I'm an old Audio guy...

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Ultrasound data transmission via a laptop

Ultrasound data transmission via a laptop | Anfractuosity | Still waiting on the daybreak, its shadows in my mind

We present a simple example of data transmission using ultrasound, using a standard laptop using gnuradio. We simply make use of the laptops
own in-built speaker, along with a cheap microphone.

Gnuradio is an excellent suite of programs, which allows the creation of Software Defined Radios.

The following is the flow diagram we designed using the gnuradio-companion program, which generates the necessary python
code for us. We make use of a carrier frequency of 23KHz, which is above the range of human hearing and a sample rate of 48KHz, which
allows us to produce this frequency. We tried PSK and FSK, but found FSK worked most reliably for this, however further research into the best
modulation technique is necessary.

Read More...
http://www.anfractuosity.com/projects/ultrasound-via-a-laptop/

Ultrasound Data Transmission with Standard Laptops by Chris Christopher

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Ultrasound data transmission via a laptop | Anfractuosity | Still waiting on the daybreak, its shadows in my mind

Ultrasound data transmission with standard laptops - YouTube