I recommend the Canopus ADVC300, It's not cheap but it cleans the signal as it captures and locks the audio. I have uploaded a 10 sec clip taken 8yrs ago with an old SVHS cam, it's full dv(26mb) showing the results compared to capture via camcorder.

right click save target as http://www.kidspc.bits-uk.com/videos...re_compare.avi

This maybe a bit over the top, but if you have a lot of video to convert, probably worth a look, it is bi directional so can be used to record back to video or used to give output from the timeline to a TV or monitor.

Mike W