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Sound/Picture synchronization program


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#1 Richardson Leao

Richardson Leao
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Posted 10 March 2008 - 07:29 AM

Using Labview, a cheap data acquisition card (e.g. a USB 6008 from national instruments: http://sine.ni.com/n...ng/en/nid/14604 150USD) it is easy to record sound and the camera shooting speed (frames per second) in a laptop and easily change the sound file to match the post synchronization of sound and picture.

Screenshot: http://bp3.blogger.c...kinorcorder.jpg

I have a Kinor 16SX that generates a 10V starting pulse and 3V pulse with twice the FPS frequency. The idea is to connect the trigger and pilot tone output to the data acquisition card and allow labview to record the pilot tone and the sound simultaneously. Nowing the original shooting frequency, the user can then resample (stretch/compress) the sound file in time according in relation to the original FPS. The program is not quite finished yet and I hope to do the resampling routine soon. I am posting this just to know if I should bother to make it more user friendly and add instructions etc (if there is interest from someone else). Also, Labview is a commercial program and is quite expensive, but if you are in academia, you get a 80% discount in the price. In future, I may do a C version of it but it will be in linux. The labview very-beta version can be found in:

http://www.geocities...norRecorder.zip

The same concept can be applied to other 16mm cams as well as 35mm and s8. The only thing you need is to know how the pilot tone is.

Edited by Richardson Leao, 10 March 2008 - 07:33 AM.

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