FoaFocusX

Apply focus to a first order ambisonic signal (B-format) along the x-axis.

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

Class Methods

*ar (in, angle: 0, mul: 1, add: 0)

From superclass: FoaRotate

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, 0], while reducing at [pi, 0]. 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.