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thomasl Posts: 3	Posted - Wed Nov 14, 2001 9:19 am  I need to improve old tape recordings by streching (battery went low on original recorder), NR and normalise the signal. I am wondering if somebody could give me a hint of what the best sequence of these tasks would be. Thanks for comments. n.b. In other threads I read a lot about first reading the manual, however, there is no manual. The only documentation are the Quick Start Guide and the online help. So your knowledge of the product very much depends on trial and error, rather than self-training.
Syntrillium M.D. Location: USA Posts: 5124	Posted - Wed Nov 14, 2001 9:31 am  Looking for manuals? You can download PDF versions for both CE2K and CEP at these links... For Pro: http://support.syntrillium.com/cep/doc.htm For Ce2k: http://support.syntrillium.com/ce2000/doc.htm As far as stretching a tape recording goes, well, it's not going to be an easy task. Assuming that the battery died 'slowly' thus affecting the pitch change over time, you'd have to use a gliding stretch. Though theoretically possible, it's going to take A LOT of trial and error to find the proper balance, let alone, trying to make it sound consistent. But, that's the fun of experimentation. Gliding stretch is part of the Stretch transform found under Transform>Time/Pitch>Stretch. ---Syntrillium, M.D. _________________
thomasl Posts: 3	Posted - Thu Nov 15, 2001 2:05 am  Quote: Looking for manuals? You can download PDF versions for both CE2K and CEP at these links... For Pro: http://support.syntrillium.com/cep/doc.htm For Ce2k: http://support.syntrillium.com/ce2000/doc.htm As far as stretching a tape recording goes, well, it's not going to be an easy task. Assuming that the battery died 'slowly' thus affecting the pitch change over time, you'd have to use a gliding stretch. Though theoretically possible, it's going to take A LOT of trial and error to find the proper balance, let alone, trying to make it sound consistent. But, that's the fun of experimentation. Gliding stretch is part of the Stretch transform found under Transform>Time/Pitch>Stretch. ---Syntrillium, M.D. Thanks for the prompt comment. In the past I actually looked at the Ce2K doc web page only, and there is only the Quick Start Guide (which comes with the download anyway). So I looked at the cep page and will now read that manual, which I suppose should apply to most of Ce2K. You are right about the change over time in the recording speed. However, it's not that dramatic, so you can split the track into different chunks and then strech works quite well, even without using gliding strech. My ambitions are not to trsnsform a 35 year old recording to meet the current standards anyway. However, I am still wondering if I should first apply NR and then stretch, or whether first apply stretch and then NR.
SteveG Location: United Kingdom Posts: 6695	Posted - Thu Nov 15, 2001 2:19 am  Okay, this is a guess. If, by any misfortune, stretch manages to produce any artefacts which weren't there before, and they are at a low level (they usually are), then doing the NR after the stretch may mean that you can reduce the levels of them. Other than that, it's anybody's guess. Steve _________________
Syntrillium M.D. Location: USA Posts: 5124	Posted - Thu Nov 15, 2001 9:27 am  I'd agree with SteveG's comments. Using NR and *then* stretching is more likely to accentuate post-processing artifacts, not to mention, possibly diminishing the effectiveness and accuracy of the stretch ---Syntrillium, M.D. _________________
thomasl Posts: 3	Posted - Fri Nov 16, 2001 4:37 am  Quote: I'd agree with SteveG's comments. Using NR and *then* stretching is more likely to accentuate post-processing artifacts, not to mention, possibly diminishing the effectiveness and accuracy of the stretch ---Syntrillium, M.D. I tried the following, which did work out quite well: 1. NR applying a profile of White Noise (recording w/o audio) 2. Steching 3. NR applying a newly generated profile based on a period of silence in the streched signal.
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