We've talked about this before, but what you'll need is a small box such as the Canopus ADVC110. This will accept analog audio and video input and put the signal out as a DV via firewire that your laptop can use. Be aware though that this little box uses consumer style connectors so you'll need the appropriate BNC to RCA for the video, and XLR to RCA for the audio.
This little box is great for this kind of stuff. I'm fairly sure it works both ways in that you can spit stuff out of the NLE and the box will output analog A/V.
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