The Domesday Duplicator is intended to allow high-quality back-ups of the analogue information contained on the laserdiscs by bypassing most of the 30-year-old electronics in the players. Direct RF sampling also allows all information on the LaserDiscs to be stored (unlike conventional RGB sampling of the video output). Since AIV LaserDiscs are a combination of video, pictures, sound and data (as well as numerous VBI streams), direct RF sampling is the preferred method of preservation.
The hardware is a USB3 based 10-bit analogue to digital converter designed to allow the backup of Domesday AIV LaserDiscs (as well as generic LaserDiscs) through the direct sampling of the RF data from the optical head (laser) of a LaserDisc player.
The hardware/software solution is designed to act as a sampling front-end to the ld-decode (software decode of LaserDiscs) project https://github.com/happycube/ld-decode and replaces the generic TV capture card to provide high-frequency sampling with 4 times the sample resolution.
A custom ADC board based around the Texas Instruments ADS825 10-Bit, 40MSPS analogue to digital converter. This board contains an RF amplifier and conditioner (to amplify the output from the LaserDiscs player RF tap and condition it for the single-ended ADC chip) as well as headers for both the DE0-Nano FPGA development board and Cypress FX3 SuperSpeed Explorer board. RF input is physically provided by a BNC connector.