Convolution help
Convolution
Convolution engine can be used for digital room / loudspeaker correction, and other similar tasks. It applies specified custom impulse response to each source channel. Impulse responses are provided as mono WAV files for each channel. Use as high resolution impulse response as possible. Only one format is needed and the impulse response is scaled as necessary to match source sampling rate.
Enabled
Enable/disable convolution engine.
Engine
Type of convolution engine.
Engine | Description |
---|---|
overlap-add | Somewhat lighter to process. Recommended. |
overlap-save | Somewhat heavier to process. |
Expand HF
When sampling rate of the convolution filter impulse response is lower than source media, the convolution filter would restrict bandwidth of the source media, as it doesn't define what should happen for higher frequencies. This option expands high frequency response of the convolution filter flat upwards where the original filter ends. When possible, it is better to provide impulse responses at higher rate. 352.8 or 384 kHz is sufficient for all cases. This option is mostly useful when the convolution filter is for 44.1 or 48 kHz rate.
Gain compensation (dBFS)
If convolution filter contains boosts exceeding 0 dBFS level, negative compensation can be applied to avoid sudden limiting when content hits an EQ boost notch. If convolution filter contains overall attenuation, positive boost can be applied to compensate for the volume loss. When testing new convolution filters, pay attention to the "Limits" counter on front page when playing, to check if there are cases where levels have exceeded 0 dBFS. In such case, lower the compensation wavlue (apply negative compensation).
Clear unused filters
When the settings are applied, clears filters that have not been specified on the page for uploading.