Hi, could anyone tell me of a way (or plugin) to clip the negative portion of a waveform?
What I’m trying to do is remove the central channel from a stereo track. I heard it’s not possible but surely it is quite simple, if you just clip the negative from L and R, invert R, mix the two, thus what remains is only what was unique to L. You then repeat this process with the other 3 half-waveforms (L negative, R positive, and R negative).
The thing that is not possible through simple channel manipulation is to “isolate” the centre part.
For removing the centre panned content, all you need to do is to “subtract” the left channel from the right (or right channel from the left). Whatever is left over is what is unique to either the left or right channel - in other words, what remains is the difference between the two channels. The following Nyquist command will do that:
What I’m trying to do is remove the central channel from a stereo track. I heard it’s not possible but surely it is quite simple
You certainly can, but you can’t get a stereo file without the “center”, at least not with simple math. The basic problem is the “left only” and “right only” channels also contain the phantom center channel.
FYI -[u]Clipping[/u] and “negative half”, don’t mean what you thing they mean… In that Wikipedia image, the top & bottom half of the waveform are clipped (squared-off). The bottom-half is the negative part of the waveform (the part below the center-line).
It’s 39 seconds long. Download that, import it to the timeline and watch the blue waves as you play it.
It may still be true that Avid video editors don’t use waveforms like Audacity does. It uses “baskets of loudness” like SoundCloud (attach).
As a result of that, I had some very strange conversations with Avid editors about how to cure problems like correcting a production with the left and right channels out of phase. Remembering that in the Baskets of Loudness view, there is no phase. One editor claimed they could cure phase cancellation by delaying (time shift tool) one side against the other a little. Piece of cake. Done it a million times.
That’s my Hollywood Hat. Movies are not cut with razor blades any more. They’re cut on (usually) Avid electronic editors (cousins to Audacity) and the result is conformed to the physical film (if any). The point is, anyone using either Avids or SoundCloud will have no idea what the audio waveform actually looks like because the waveforms are not presented.
Maybe you’re just describing it wrong, but anyone slicing off the negative excursions of performance waveforms just produces highly distorted trash and worse yet, a DC component which may make anything after that crash.
And yes, that’s exactly what LRMono is supposed to do. There is a text narrative associated with that test explaining what each segment is.
Kozikowski, with the greatest of respect, I feel that you and I are having two different conversations here. From everything you write, it seems like you have misunderstood what the purpose of this thread was to achieve and I get the feeling you are just not listening to me.
I made this thread because I needed help making a technique to remove the central channel, which I successfully achieved with Steve’s help. You then posted a test wave for me to try it on, and so I tried my effect on your test wave, and it worked, successfully removing the central channel and leaving the left and right channels intact.