Neat. Note that this technique will work on <i>any</i> system that has a high-speed I2S bus that can be operated by DMA, which these days is quite a lot of microcontrollers.<p>See also Fabrice Bellard&#x27;s DVB-T broadcast using XWindows: <a href="http:&#x2F;&#x2F;www.bellard.org&#x2F;dvbt&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.bellard.org&#x2F;dvbt&#x2F;</a><p>It&#x27;s a kind of reverse &quot;TEMPEST&quot;: rather than detecting a computer&#x27;s accidentally radiated emissions, deliberately radiate emissions in a particular pattern to produce a radio signal.