Quantcast Recording Video: Audio on Tape Goes up and Down - digitalFAQ.com Forums [Archives]
08-19-2003, 05:59 PM
TKS TKS is offline
Free Member
Join Date: May 2002
Posts: 118
Thanks: 0
Thanked 0 Times in 0 Posts

I just captured a concert from one of my old tapes and i while i was capping it i noticed that the audio on the tape would go up and down.. sorta like someone playing with the volume button. Anyways.. I was wondering is there a way i can normalize the audio with some program to even out these "swells"? or am i outta luck? Ive tried accouple of programs like cooledit 2000, but i am not very good with it..


Reply With Quote
Someday, 12:01 PM
admin's Avatar
Site Staff / Ad Manager
Join Date: Dec 2002
Posts: 42
Thanks: ∞
Thanked 42 Times in 42 Posts
08-19-2003, 06:06 PM
kwag kwag is offline
Free Member
Join Date: Apr 2002
Location: Puerto Rico, USA
Posts: 13,537
Thanks: 0
Thanked 0 Times in 0 Posts

Encode your audio (WAV) with HeadAC3he, and it should be automatically normalized to 100%.

Reply With Quote
08-21-2003, 01:23 PM
incredible incredible is offline
Free Member
Join Date: May 2003
Location: Germany
Posts: 3,189
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via ICQ to incredible
The problem with "swells" in source audio is, that the analyzer of a normalizing engine like in HeadAC3che or Besweet thinks at the first highest point of a swell that this is the max. volume during the WHOLE audio track! He analyzes the track as a whole and so he can't figure out which "peak" means highest volume in the track and which "peak" is just a swell.

If a normalizer would perform the intensity at every part of the ausio individually ... the result would be a audio track which sounds like handled by an extreme "Compressor" which kills the whole dynamic of the audio track and not only at the swell-parts.

But what you can do is one "crazy" thing ;-) :

Load the audiotrack into CoolEdit and perform during the whole audiotrack a "Volume LFO" ... crazy, yes, but it makes sense, maybe CoolEdit contains a LFO option.

Find out the offset where the LFO should begin and the frequency of the LFO which is needed to hit exactly the opposite of the up and down Volume frequency of the Track. A LFO is an "Low Frequency Oscillator" and performs exactly the same: swells! ;-)

Its a hard work if you will find out the intensity and the frequency of this LFO but maybe your recording is one of the most important things in your life ... in this case it makes sense ... just only trying ... I enjoyed the same problem a long time ago and I did it on a MAC with another aplication and it worked. The crazyiest work was to figure out the exact frequency of the Volume Swells!!!
Well it sounds much much better than before. ;-)))
Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
Recording Video: Dropped Frames and Audio sync errors! the viking Video Capturing / Recording 19 01-06-2005 10:42 AM
Recording Video: Best budget-priced video capture card? digitalvideo Video Capturing / Recording 2 04-17-2003 09:31 AM
Recording Video: IVTC poor quality video? segfault Video Capturing / Recording 5 01-13-2003 02:52 PM
Recording Video: Huffyuv and Noisy Video sources? TKS Video Capturing / Recording 1 11-23-2002 11:28 AM
Recording Video in Huffyuv with Ulead video studio SE? mpierce Video Capturing / Recording 0 09-06-2002 12:34 PM

Thread Tools

All times are GMT -5. The time now is 05:45 PM  —  vBulletin Jelsoft Enterprises Ltd