FoaFocusZ:
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FoaFocusZ
ExtensionExtension

First Order Ambisonic (FOA) focus transformer

Description

Apply focus to a First Order Ambisonic signal (B-format) along the z-axis.

NOTE: FoaFocusZ is usually called via the convenience wrapper FoaTransform.

Class Methods

.ar

Arguments:

in

The B-format signal, an array: [w, x, y, z]

angle

The distortion angle, in radians. -pi/2 to pi/2

mul

Output will be multiplied by this value.

add

This value will be added to the output.

Discussion:

Focus is a normalised dominance variant, specified in terms of a distortion angle. Positive values of angle maintain gain at [0, pi/2], while reducing at [0, -pi/2]. Negative values do the inverse. The default, 0, results in no change.

In contrast with zoom, gain is maintained at 0dB in the direction of distortion.

NOTE: Corresponding matrix transformer: FoaXformerMatrix: *newFocusZ

Examples

Transforming-FOA.