how do i convert PAL audio to NTSC?

[just]

i have a wave file which i would like convert to NTSC compatible it is currently PAL
how do i go about doing this?

[guns1inger]

It depends on the source you are trying to match. Audio isn't PAL or NTSC, it has a duration. You have to change the duration to match the running time of the video you have. This may mean speeding it up, or slowing it down depending on the NTSC framerate of the video.

Audacity can do this, as can Sound Forge. If done properly then the pitch should not be affected by the duration change.

BeSweet can also do this, although I prefer the control an audio editor gives.

This will only work if you can sync up the beginning of the audio to the video exactly, and if the two version of the video (PAL and NTSC) are from the same source. If one is edited slightly differently to the other, you will have a bigger problem on your hands.

[reboot]

I'm going to disagree just a bit. Audo has duration, video has duration. Framerate is based on where you live. A PAL source, encoded to NTSC should be exactly the same duration, thus the audio is also the same duration. If it's not, you're encoding something wrong.
A WAV file is not PAL nor NTSC, it simplly is a sound byte of a given length.
If a source movie is 2 hours long, in PAL format at 25fps, encoding it to NTSC format at 29.97fps should result in a movie that is also exactly 2 hours long.
With that said, what guns1inger said may also be true, depending on HOW you encode, and what tool(s) you use to do it.

[jonas more]

If a source movie is 2 hours long, in PAL format at 25fps, encoding it to NTSC format at 29.97fps should result in a movie that is also exactly 2 hours long.

Do you actually encode at 29.97fps?

I encode at 25fps and then apply pulldown flags with DGPulldown.

Anthony

[reboot]

That's another way of doing it. I didn't want to put TOO much advanced detail into the post, for fear of adding more confusion.

If it were ME.
Extract audio from source.
Encode audio to AC3, if it isn't already.
Encode video at 25fps.
DGpulldown to 29.97fps.
Author and burn.