de.sciss.synth.ugen

Rotate2

object Rotate2 extends Serializable

A UGen that can be used for rotating an ambisonic B-format sound field around an axis. It uses an equal-power rotation so it also works well on stereo sounds. It takes two audio inputs ( x , y ) and an angle control ( pos ). It outputs again two channels, using these formulas:

xr = cos(angle) * x + sin(angle) * y
yr = cos(angle) * y - sin(angle) * x

where angle = pos * Pi . This allows, for example, the use of LFSaw to create a continuous rotation around a circle. Note: Be careful when accessing the output channels. xr and yr are the X and Y output channels, whereas x and y refers to the X and Y input channel.

Examples
// 4-channel rotation of opposite sounds
play {
  val p = WhiteNoise.ar(0.05)                     // first source
  val q = Mix(LFSaw.ar(Seq(200, 200.37))) * 0.03  // second source
  // B-format encode 2 signals at opposite sides of the circle
  val enc = PanB2.ar(p, -0.5) + PanB2.ar(q, +0.5)
  val Seq(w, x, y) = (0 to 2).map(enc \ _)
  val rot = Rotate2.ar(x, y, MouseX.kr(-1, +1))
  // B-format decode to quad (front-left, front-right, rear-left, rear-right)
  DecodeB2.ar(4, w, rot.xr, rot.yr)
}
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  6. def ar(x: GE, y: GE, pos: GE = 0.0f): Rotate2

    x

    B-format X input channel

    y

    B-format Y input channel

    pos

    angle to rotate around the circle, normalized between -1 and +1. -1 and +1 corresponds to -180 and +180 degrees (behind), -0.5 is 90 degrees left, 0 is frontal, +0.5 is 90 degrees right.

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  15. def kr(x: GE, y: GE, pos: GE = 0.0f): Rotate2

    x

    B-format X input channel

    y

    B-format Y input channel

    pos

    angle to rotate around the circle, normalized between -1 and +1. -1 and +1 corresponds to -180 and +180 degrees (behind), -0.5 is 90 degrees left, 0 is frontal, +0.5 is 90 degrees right.

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