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|  [Time streching] - what do you recommend? [MUSIC] | |
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FeralCode
  Member
Topics: 125
Replies: 1202
Registered: 19.Mar.03 |
I wonder if you can recommend me a prog / effect, with which you can alter the sample bpm to the required rate. For example to increase the tempo of a vocal sample, etc.
I have some applications which do it, but i'm looking for some quality staff, which can handle even extreme situations without loss of quality.
Thanks
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Void Pointer
 Artist
Topics: 68
Replies: 5292
Registered: 08.Feb.03 |
Hmm, how do you mean? Lets take beat loop for examples. You can do it 2 ways... first is that you just turn the pitch up or down, but obviously the tone will drop or raise - and that can't work so well sometimes... other option is "time strech/shorten", it will just force the sample to be longer or shorter, that means no pitch difference but there can be some quality loss.
Pitch bending can be done by every program, but for time streching/shortening I recommend Soundforge. It has alot of presets for that particular functyion and I'm sure 1 preset is the one that will fit for your desire 
NEW TRACK ONLINE: Paddo (425 hits) |
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FeralCode
Member
Topics: 125
Replies: 1202
Registered: 19.Mar.03 |
Yeah, i was looking for the right word: time streching: this is exactly what i need.
Maybe a single dx / vst can handle it? Not to use a whole prog for only one feature?
Thanks anyway.
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oldbrian
Artist
Topics: 11
Replies: 359
Registered: 09.Mar.04 |
maybe Celemony's Melodyne 2 is what you are looking for. though i haven't played with that too much but they say it can do pretty good things. time stretching and stuff like that. cheers  |
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Void Pointer
Artist
Topics: 68
Replies: 5292
Registered: 08.Feb.03 |
Well, soundforge uses DX plugins so I can send you the thing you need 
NEW TRACK ONLINE: Paddo (425 hits) |
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32071614043234
Member
Topics: 40
Replies: 495
Registered: 03.Dec.03 |
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Impossible to do it on a vocal, think of it mathematically.
You can't change frequency, to get the same note, but you can change waveform.
In order to stretch things out, you have to quantize certain sections, and timestretch the spaces in between those units. With rex, its easy, you just quantize the individual hits on the loops, so for drum loops, its possible. The file is already quantized.
For vocals, its impossible because the wave file is continuous. The only quantization method would be to pick a freqeuncy or a note duration, say 1/32nd, 1/64th, and use those. So if a program does exist, it probably divides the vocal into those sections, and increase the sapce, for a spaced area, it probably repeats the note or frequency, and that would have an undesired effect, like repeating a syllable, it getting cut off etc wouldn't be good.
I guess the other way they could do it is somehow computate natural voice sections and fill them in the time stretched spaces, but that would require sampling and vocaloid type technology. I dunno if good ones exist, because its a really weird thing to do, its like telling a program to take a song, and divide it into midi notes, and find each individual sample without the reverb, and separate the tracks.
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HomesickAlien
Member
Topics: 16
Replies: 391
Registered: 17.Apr.03 |
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oceanseeker wrote on 04 Jun. (2:36) :
Impossible to do it on a vocal, think of it mathematically. |
I time stretch vocals quite often actually, and no one has ever said anything about the quality going down.
I use cool edit pro's time stretch mechanism. It works much better than soundforge's in my opinion. In soundforge I usually can detect artifacts that sound as though the sample has been flanged to some extent. With cool edit it's much much less drastic.
I've had good results between about 65% of the original time, and 150% of the original time. It seems like once you go beyond that, issues start popping up wildly.
The way it works, as far as I can tell from looking at the waveforms, is that it subdivides the section many many times, and then adds an extra loop back based on how you ask it to stretch. For example, a 150% stretch would loop back every other waveform. So it would go waveform 1, 2, 2, 3, 4, 4, 5, 6, 6, 7, 8, 8, etc. and by using waveforms from start to finish on zero crossings, you end up with no pops, cracks, or anything. Anyhow, that's what my intuition and little bit of research tells me. It might vary from that though. |
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Void Pointer
Artist
Topics: 68
Replies: 5292
Registered: 08.Feb.03 |
HomesickAlien wrote on 04 Jun. (3:14) :
oceanseeker wrote on 04 Jun. (2:36) :
Impossible to do it on a vocal, think of it mathematically. |
I use cool edit pro's time stretch mechanism. It works much better than soundforge's in my opinion. In soundforge I usually can detect artifacts that sound as though the sample has been flanged to some extent. With cool edit it's much much less drastic.
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Then you probably used the default preset. You can play around with the settings and presets to get amazing results!
NEW TRACK ONLINE: Paddo (425 hits) |
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MatthijsB
Artist
Topics: 40
Replies: 2038
Registered: 10.Feb.03 |
Actually I use the time-stretching preset from cool edit/adobe audition... cooledit has some superior algorithms when it comes to time stretching and de-noising and such 
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HomesickAlien
Member
Topics: 16
Replies: 391
Registered: 17.Apr.03 |
Void Pointer wrote on 04 Jun. (8:48) :
Then you probably used the default preset. You can play around with the settings and presets to get amazing results!
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No actually, I used to use soundforge exclusively for a long while. Once I discovered how much better at some things cool edit is, I made the descision to use both.
Everything MatthijsB said is true. I still use Soundforge for some things because I like the GUI a little more. |
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