8 Nov
2013
8 Nov
'13
1:38 a.m.
On Thu, Nov 07, 2013 at 05:26:24PM -0800, coderman wrote:
friend and i spent a few hours earlier this week playing around with high frequency data transmission over PC speakers and microphones.
my hearing is rather poor, as sounds > 13kHz are inaudible to me. $friend can hear just over 17kHz.
a few normal laptops and mics were able to emit and receive in the 18kHz to 20kHz frequencies just fine, and (unsurprisingly enough) there's almost nothing in this range naturally.
a side channel just waiting for use!
bit rate is poor in our limited example, however. i'll leave high speed, error correcting implementations to the reader ;)
Or, you know, just look on github. https://github.com/piannucci/blurt -andy