No clue tbh, but you could prompt claude to whip up a python script that does stereo correlation analysis for multiple wav files and draws a graph. just sayin... or you can script it yourself. it's not rocket science

 

I own MetricAB and I read manuals thoroughly, but I either overlooked or forgot about that since I only use "Meters." Good catch.

"Click the History button to use the correlation history graph. This enables us to see the correlation values over a time period. This is useful for getting an overview of a whole track, or catching the odd anomaly that could be missed using a momentary visualizer.
Click the Scroll button to set the window size for the history graph between 10 seconds and 10 minutes. When scroll is off, the window will adapt to fit the elapsed time up to a maximum of 10 minutes."

 

I like the idea of showing the channel correlation over time, however you cannot show much information in a single curve. Correlation is usually shown as a X/Y plot of dots (audio samples) according to their phase relation. How would you show this over time?
A single line can show something like the average correlation sum but it won't show if the out-of-phase components really matter.
I could imagine a frequency dependent display though, something like the spectrogram phase (instead of amplitude) display over time, analyzing the phase correlation of the two stereo channels.
This would also help identify the source of the problem.

Maybe a software developer is reading this ;)

 

You might be confusing a phase meter and correlation meter. Correlation is usually a single straight line plot. When shown horizontally, out of phase is indicated by the meter swinging left and in phase to the right. For instance the meter in bx control plugin, in its lower right corner.
https://www.plugin-alliance.com/en/...3E2B7s8QcEnYhcIiBi9Jvhmg7livt1CA8wGmAZnxKuaBw

Or Waves InPhase, also in the lower right
https://www.waves.com/plugins/inphase

In the case of Metric AB, in phase info is indicated on top and vice versa.

 

To plot the phase correlation of an audio signal over time, you need 2 axes:

• the x-axis represents time
• the y-axis shows the correlation coefficient, which ranges between -1 and +1

The visualization can be done in two ways:

1. as a single correlation line across the entire frequency spectrum
2. as a multi-band analysis, where the signal is divided into different frequency bands and the correlation for each band is plotted separately (e.g. in different colors or rows)

The technical implementation using scripting is, as I said before, easy. Every SOTA LLM will give you a working code example.

 

Last edited: Dec 8, 2024