Topic: Timecode Help/Wavelab 5.0

[charles]

Ok. I'm putting together a matrix using the montage function on Wavelab 5.0. I've made quite a few post-show matrix recordings in this fashion, and I've used the timecode stretch function many times. I've never had a problem with getting the timecode synced up. Now, all of a sudden, I can't seem to get it right. When I stretch the timecode I end up with good alignment at the start, close alignment at the end and a good bit of difference in the middle. What the hell is going on? I've been troubleshooting, looking for mistakes I might have made and can't find any. Although I've used timecode stretch a great deal, I don't fully understand timecode. The two devices used to record are an Edirol R4 and a JB3. Any help and/or explanation would be really apreciated.

[RebelRebel]

A very wise man that I know told me  that fluctuations in dynamics will cause things to be thrown off because of  DSP usage......id never heard that before but it seems tangible... make a selection...run it at -15, then -10, then -5, then -10..etc.. and try to stetch both of them..try a fixed one and a dynamic one....and then do one with triangle and square waves..and you should be able to see where the sample inaccuracies appear....dynamics have to do with time..if you take a string and shape it like a waveform...less dynamics=more string, more dynamics-less string...


I can line them up for you if you want, or I can send you a alignement spreadsheet that I use. Im getting pretty decent at it.

Teddy

[charles]

Thanks for the help. +T I'll give it a try and report back.

[the yokel]

I'd guess that it's probably dropout in one of the sources.  Go back to your original unstretched montage & check to see if there is an abrupt drop in sync somewhere.  If there isn't, try time stretching in 10 min. increments instead of the whole set @ once. That should give you a better idea of whats going on. 

[charles]

Thanks. I'll give that a try. Would make sense. I tried the spreadsheet and still no luck.

[charles]

Dropouts may be the cause. I've found about 6 100 to 200 ms dropouts. Does anyone know if there is a program with a function that will find dropouts? I have the following programs: Wavelab 5.0 / Soundforge 8.0 / Samplitude Professional

[RebelRebel]

use sound forge >find>find glitch> set threshold>

[charles]

set threshold to what?

[RebelRebel]

32.5 threshold slope and 52 sensitivity.

start there and experiment.