This is essentially a quick edit involving a computer and an NLE (non-linear editor) of some kind.
- You'd transfer (DV "capture") the video onto the computer.
- Then you'd open it in an NLE like Adobe Premiere, Sony Vegas
Video, or Apple Final Cut Pro.
- Cut the audio track.
- Then export it back from the NLE onto a new tape.
Note that this is realtime, and retains the full original DV quality -- it's not using a lossy analog step.
I'm curious why you'd need to do this. It's not a common task.