Signal attenuator controllable by UDP,TCPIP?

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To simulate digital television picture breakup for a degree project, an automated signal attenuator is needed to control attenuation via software on a PC. The proposed setup includes a USB TV receiver connected to a signal attenuator with a serial input for software control. While manual attenuators are available, the focus is on finding a digital solution that allows for automation. Suggestions include building a serial to parallel interface, possibly using a BCD converter, which can be sourced from surplus equipment. The discussion emphasizes the importance of hardware compatibility for successful automation.
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Hello as part of a degree project I need to simulate digital television picture breakup, as demonstrated when the signal level is low or interferred with. I have found manual attenuators which are quite cheap but I need to automate the process with software on a pc. Is there anyway possible of acheiving this?
I envisage a pc running a usb tv receiever, the aerial coax cable plugged into a signal attenuator, the signal attenuantor having a serial input which allows the attenuation to be controlled via software on the PC. the software side is not an issue, merely the harware.
Many thanks
 
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Digital attenuators were common place when I was doing RF. May need to build a simple serial to parallel interface, maybe with a convertor to BCD. These should be available surplus, based upon the magnitudes of quantity that I have seen scrapped.
 
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