Double speed

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stefangs
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Double speed

Post by stefangs » Sun Dec 07, 2014 9:46 pm

Hi all,

I've digitized some audio from a reel-to-reel recorder. The tape was recorded at 15 ips, but my deck can only play back at 7.5 ips, so the audio is now slow by a factor of 0.5.

Can I speed this up to make it play back at the proper pitch? Pitch shifting/time stretching doesn't sound like a good idea. What I'm looking for is probably more like a sampler playing back an octave higher.

Thanks for suggestions,
Stefan
MacPro, Wavelab7, Logic, ProTools, Digital Performer

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Arjan P
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Re: Double speed

Post by Arjan P » Sun Dec 07, 2014 10:25 pm

Simply change the sample rate of the audio properties (not render) to double the sample rate used for recording. So if you recorded at 44.1 kHz, change sample rate to 88.2 kHz and save. Done!
--- "If anyone owes it all to Bach, it's God" - Emil Cioran ---
SOFT: (All 64 bit) | WaveLab 9.5.50 | Cubase 10.0 | HALion 6.0 | Win10 Pro - SoundCloud
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stefangs
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Re: Double speed

Post by stefangs » Sun Dec 07, 2014 11:34 pm

Yea, nice quick and dirty approach. But it's now a bona fide 88.2K audio file which isn't what it's supposed to be. Would you say that doing this and then follow with a sample rate conversion back to 44.1 would be the next best thing? Sounds like a plan to me. How do those samplers actually do it?

Thanks,
Stefam
MacPro, Wavelab7, Logic, ProTools, Digital Performer

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Arjan P
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Re: Double speed

Post by Arjan P » Mon Dec 08, 2014 12:25 am

Yeah if 88.2 is what you have now, just double that and work from there. If no other processing is needed you can convert the sample rate the usual way to what you want it to be. If processing is needed I'd do that on the new 'doubled' file and then render with dithering to the final product.
--- "If anyone owes it all to Bach, it's God" - Emil Cioran ---
SOFT: (All 64 bit) | WaveLab 9.5.50 | Cubase 10.0 | HALion 6.0 | Win10 Pro - SoundCloud
HARD: i7-950 | Asus P6TD | 30GB | Tascam DM-3200 | DigiMax48 | Midisport 8x8 - SoundByte Studio

stefangs
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Re: Double speed

Post by stefangs » Tue Dec 09, 2014 10:06 am

Great, thanks much. Too bad I can't do all that in a batch - should have done it on the source file, but I've already split it all up... oh well.

Stefan
MacPro, Wavelab7, Logic, ProTools, Digital Performer

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