O3A Directional Emphasis

Host Support

Audio

Controls

• Azimuth
• Elevation
• Focus
• Strength

Description

This plugin modifies levels in a 3D O3A mix to emphasise sound in a particular direction. It is similar to the O3A Directional Mask plugin.

The emphasis direction can be set using the azimuth and elevation controls, or the control surface, where the direction is indicated by the crosshairs.

There are labels on the control surface to help you find left, right, above etc. However, if this still does not make any sense, you might want to see our page on the O3A Visualiser which lays out its viewing region in the same way.

The algorithm used is a "passive" one and should not colour the frequency content of the sound significantly.

This plugin takes a fairly simple approach, providing control in one direction and just two further control parameters. For more sophisticated manipulations you may want to use the O3A Spatial Mask plugin.

This plugin has behaviour which is consistent with Rapture3D directional emphasis.

The plugin is available in the O3A Manipulators plugin library.

View Support

When used with O3A View Sync from the O3A View library, this plugin can be connected to the separate View or ViewVR applications.

When this option is available, a 'View' button appears at the top right of the plugin's user interface.

When this is pressed, the plugin is connected to the View or ViewVR application and is displayed there.

Controls

Controls: Azimuth and Elevation

Azimuth and Elevation control the direction to emphasised.

Azimuth is the horizontal angle, between -180 to +180 degrees, measured anticlockwise (left) from the front. Elevation is a vertical angle between -90 and +90 degrees, measured with positive upwards and 0 on the horizontal.

For instance, the direction for azimuth +90 and elevation +45 can be found by turning 90 degrees to the left and then looking up by 45 degrees.

Control: Focus

Focus determines the shape of the emphasis, with higher values using a more focussed (narrow) region.

A value of zero means that no modification is made to the stream. The focus value can go up to three, for the most focussed emphasis.

Control: Strength

Strength determines how aggressively sounds not in the focussed region are reduced in level.

Strength values are between zero and one, where a value of zero means that no modification is made to the stream and a value of one provides the strongest emphasis.