User manual

24 / 36

6. Convolution engine

Convolution engine can be configured through the “Convolution” menu and selecting

“Engine setup...”.

Following dialog will be shown.

When “Engine enabled” option is checked, convolution engine is enabled at the

application level and enabled by default at the startup time. Enable this selection only

after selecting suitable impulse response files and if you are certain that your files

contain intended impulse response data.

Convolution algorithm can be changed from the “Convolution engine” selection. There

are two possibilities, “overlap-add” consumes less CPU power and is recommended.

Another alternative is “overlap-save” which consumes more CPU power.

To select impulse response files, “Browse...” button can be used. A normal file

selection dialog will be shown. After a file is selected, some preliminary checks for the

suitability is done and an error message is displayed in case of incorrect file details.

Left and right channels can have independent files.

When an impulse response file is selected through “Browse...”, it's estimated gain

function is calculated and displayed in “IR gain” box. This can help choosing suitable

value for “Gain compensation”. Also the default convolution engine can be selected.

When positive gain compensation is chosen, it is applied as negative gain when

convolution is disabled from the main screen. This makes it easier to compare impact

of the particular convolution setup.

When provided impulse response is lower sampling rate than source material, it's high

frequency response can be expanded to cover the new bandwidth by selecting

“Expand HF” setting.

Clicking “OK” will save the setting to the configuration file and the settings are ready

for use.

Convolution engine setup dialog