Sweet spot for audio speedup?

riredale wrote on 5/19/2012, 9:47 PM

I use the "Time Stretch" feature all the time to make various audio tracks recorded simultaneously with different devices (and clock rates) sync up. I know that for very small corrections there is no sonic degradation, but for large shifts there are numerous artifacts.

I just recorded "Flight of The Bumblebee" and the director wants it faster. Has anyone noticed any particular "sweet spot" for increasing the speed between 10 -20% yet where artifacts are hopefully inaudible due to hitting sort sort of sampling multiple? This is with V7d, though I assume later versions work the same way.

Comments

DataMeister wrote on 5/19/2012, 11:46 PM

Depends on the plugin you are using.

If you have Sound Forge 10 there is a plugin called élastique Timestretch from Zplane that is significantly better than the previous Sonic Foundry plug-in. There is virtually no sweet spot for this plugin. All speeds sound good.

http://www.sonycreativesoftware.com/soundforge/tools

I think it is a 32 bit plug-in as it is not showing up in my copy of 64 bit Vegas 11.

WillemT wrote on 5/20/2012, 5:58 AM

In Vegas 11 right click the audio event and under the "Time stretch / pitch shift' section select "élastique" from the drop down menu (it defaults to none). Unfortunately that option is not available in Vegas 7.

Willem.

Steve Mann wrote on 5/20/2012, 7:29 AM

I do this frequently when a program slot is one-hour on a cable channel and the edited program is three or four minutes too long. I won't reveal my secrets to them because they are a die-hard FCP and Premiere shop and I love doing things they can't. At least not in the time-frame allowed.

riredale wrote on 5/20/2012, 12:54 PM

Thanks to all. I tried Sound Forge years ago, and found the interface less-intuitive than Vegas, but for some operations I guess it does offer more horsepower.