Video card used as a digital TV modulator


DVB-T is a standard for broadcasting digital television over the air and is found in many countries outside of North America. This hack involves using a video card to generate the DVB-T signal. This project was inspired by Tempest for Eliza, which we covered recently. To pull this off you have to add some custom settings for an additional screen in your X server configuration. When you start up the server and switch to the new screen it will generate the proper signal. The signal strength is pretty weak though and the card has to be wired directly to the DVB-T set-top box. The box will display two different channels, each with a test image. The signal isn’t actually generated directly, but is a product of the VGA card’s DAC’s harmonics.

[thanks james]

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