Summing sources
In Treble you can sum multiple sources to calculate their combined impulse response and its derived acoustical parameters. The source summing process is initiated within the results view, after a simulation has been run, meaning you don't have to decide in advance what sources you want to sum before running a simulation.
The wave based solver and image source method in Treble are pressure based and take phase information into account, both for the direct and reflected sound. You can therefore use Treble to analyze e.g. the constructive and deconstructive interference of correlated and uncorrelated sources when summing. Read more about the theory behind Treble's IR generation here and here.
When entering the results view you can find the source and receiver selector in the bottom left.
To sum multiple sources select the "Source" field. You will then get a list of all the sources in the simulation. Click on the "Sum multiple sources" button to select which sources to sum.
You can enter a name for the group of sources you want to sum in the "Summed source name" input field. Select which sources to sum by selecting the respective checkboxes next to each source.
After selecting the sources you want to sum, click on the "Sum" button.
The source summing process will then start. You can do other tasks while it runs. Depending on the number of sources that are being summed, the length of the IR's and the number of receivers the process can take anywhere from a few seconds to a few minutes.
Once the summing process has concluded the new summed source will be visible under the "Summed sources" section in the source list.
By selecting the summed source you can now analyze all the different acoustical parameters for the summed response. The summed source is now tied to the simulation and will always be accessible through the results view when visited again.
The G parameter is not calculated for a summed source as it by definition assumes an individual source with a fixed geometrical center.