Acoustic QR Code Sender

7 May 2016

Play
Width
Height
Offset

You will almost certainly need to adjust the settings depending on what speaker / microphone combination you're using.

The Offset is the lowest frequency sent, and (Offset + Width) is the highest frequency sent. I find that above ~8kHz there are weird harmonics and reflections.

The Height corresponds to the duration of the message. Try to adjust this so the image on the receiver is as square as possible.