Digitally Double Pitch and Speed Of 7.5 IPS Tapes Perfectly- Don't have 15 IPS machin

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CX844

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Hi all.

Well you can tell this is a newbie question. LOL

My problem is I have some 15 IPS tapes, but only a 7.5 IPS machine to play them back on. My question is: I want to play them at 7.5 IPS, on to my computer. (record them digitally on to my computer. I have all the gear to do that) which is 1/2 speed, THEN digitally double the pitch, and the speed, thusly bringing them up to the normal speed, and pitch, as if I had a 15 IPS machine to play them back in the first place.

I want to do that with no loss of fidelity, no weird sounds, or bazaar side effects. HOPEFULLY, the fidelity would be as good as if I had the 15 IPS machine to begin with. I'm using an M-audio Firewire-410, and Nero 7.

Is there FREE software to do this, or ANYTHING that can do this?

Any help would be appreciated.

Thank you very much!:)

Dave
 
whatever you do, record it at the highest possible sample rate --

this will allow you to do better timestretching for sure.

and then perhaps you want to use reaper (40 dollars shareware) for stretching it back into place. it has some great algorithms for this (elastique pro v2).
 
Would it be terrible practice to record your tapes at 48KHz and then change the sample rate to 96 (without resampling) and then work with it from there? Or are the algorithms in Reaper, for example, going to give you better results?

Sound Forge (and prob. others) lets you simply change the sample rate without resampling. Or, with an external clock source, I can force my machine to a particular rate, overriding the spec'd rate for the audio source. I've played things back at the wrong sample rate (44.1 vs. 48) and not realized until I noticed that it was a nearly a whole-step off.
 
Whale Bone said:
Would it be terrible practice to record your tapes at 48KHz and then change the sample rate to 96 (without resampling) and then work with it from there? Or are the algorithms in Reaper, for example, going to give you better results?

Sound Forge (and prob. others) lets you simply change the sample rate without resampling. Or, with an external clock source, I can force my machine to a particular rate, overriding the spec'd rate for the audio source. I've played things back at the wrong sample rate (44.1 vs. 48) and not realized until I noticed that it was a nearly a whole-step off.
Click to expand...

i would use a program like audiomove or r8brain pro to change sample rates.
 
What you need to do is record the tape into the computer at 44.1k or 48k. Then play it back at 88.2 k (if recorded at 44.1k) or 96 k (if recorded at 48k)

In soundforge, you can change the sample rate the file thinks it is without resampling. Once you do that, everything will work normally.

You don't want to do any sample rate conversion.

You had it figured out correctly, go for it.
 
Farview said:
What you need to do is record the tape into the computer at 44.1k or 48k. Then play it back at 88.2 k (if recorded at 44.1k) or 96 k (if recorded at 48k)

In soundforge, you can change the sample rate the file thinks it is without resampling. Once you do that, everything will work normally.

You don't want to do any sample rate conversion.

You had it figured out correctly, go for it.
Click to expand...
Sorry to be so neglectful. Thanks a lot for answering everybody! So Fairview, I think it will work. I used a vinyl recording of Blood Sweat & Tears Newblood, "Touch me", and they sounded like the Chipmunks. LOL Not quite right though. It was recorded at 44.1, and the only option Audacity had was 96K. I couldn't figure how to do that with Nero.

This whole thing is about a truly gifted singer, named Peggy Ford. I recorded her with a Teac 3340S and two Sony 22PP Mics about 30 years ago. She was just incredible. Unfortunately, I set the meters real hot, and I think that contributed to a lot of high frequency loss after all that time. (?) I shudder to think how good it would sound, if I cooled it a little, and could have saved it to digital back then. The thing is, I don't even want to touch the tapes, until I'm ready to record them digitally. I have a Crown CX844, but I have to get it fixed, because the tension is a mess, and it will eat anything that you put in to it. So the next step is record something on my other Teac at 7.5 IPS, drop it down to 3.75 IPS then record it on to the computer, do your doubling trick, then compare it to the original.

When I'm done, I'll post a link somewhere to one of the songs. IMO, she easily could have made it to the top ten of American Idol, and maybe even won it. But then again......I may be a bit partial. ;)
 
If you don't have 88.2 as an option, you need to record at 48k in order to do what you are trying to do.
 
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