Why is the Reverberator output a two-column matrix.

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A quick question as the title states, why does my audio signal returned as a two-column matrix from a reverberator.
reverd4 = reverberator('PreDelay', 0.2,'DecayFactor', 0.8);
y4 = reverd4(y);
What does each of the columns represent. Therefore, when I want to plot the audio signal vs time, which column of data should I use?
Also I want to add the products of multiple reverbs (reflection copies) together. Therfore, should I add both columns with the rest of the pairs of columns, or just one from each?
Thanks

Accepted Answer

Brian Hemmat
Brian Hemmat on 22 Jun 2020
The two columns represent the left and right channels of a stereo recording. The reverberator object is intended to mimic an acoustic environment where the time-delay between your ears carries important information.
Depending on what you want to analyze by plotting, you can either convert the audio signal to mono by taking the mean, or plot each channel separately.
To add multiple reverberations together, you can take the means of the respective channels. To be clear though, the reverberator object does not just produce a single reflection. It includes a reverberation tail, as described in the algorithm section.

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