Convolution2L

A frequency-domain convolution UGen using two linearly interpolated fixed kernels. When a trigger is received, a linear fade will be performed from the previously used kernel (internally stored by the UGen) towards the snapshot of the current kernel content upon receiving the trigger.

The delay caused by the convolution when the kernel is a dirac impulse is equal to frameSize - controlBlockSize , so for a frameSize of 2048 and a control-block size of 64, this is 1984 sample frames.

Note: If a trigger is received before the previous fade is complete, the interpolation is broken and the kernel instead jumps straight to one of the two buffers.

Examples

// three example kernels
def mkBuf(n: Int, amp: => Double): Buffer = {
  val v = Vector.tabulate[FillValue](n) { i =>
    (i.linlin(0, n, 0, 2048).toInt, amp)
  }
  val b = Buffer(s)
  b.alloc(2048, completion = b.zeroMsg(b.setMsg(v: _*)))
  b
}

val b = mkBuf(3, 1)
val c = mkBuf(50, math.random)
val d = mkBuf(20, 1)

val x = play {
  val z     = Impulse.ar(16)
  val buf   = "kernel".kr(b.id)
  val tr    = "trig"  .tr
  val dur   = 4.0          // fade-time in seconds
  val n     = 2048
  val block = SampleRate.ir / n
  val p     = dur * block  // ... in periods
  Convolution2L.ar(z, buf, tr, 2048, p) * 0.5
}

x.set("kernel" -> b.id, "trig" -> 1)
x.set("kernel" -> c.id, "trig" -> 1)
x.set("kernel" -> d.id, "trig" -> 1)

x.free(); b.free(); c.free(); d.free()

See also: Convolution
Convolution2
PartConv

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def ar(in: GE, kernel: GE, trig: GE = 1, frameSize: GE, fadePeriods: GE = 1): Convolution2L

in
the realtime input to be convolved
kernel
buffer identifier for the fixed kernel, which may be modulated in combination with the trigger. Even a trigger input of zero is used, upon UGen initialization the kernel must point to a valid buffer, otherwise the UGen aborts.
trig
begins a fade to update the kernel on a change from non-positive to positive (<= 0 to >0).
frameSize
size of the kernel. this must be a power of two. the FFT calculated internally by the UGen has a size of twice this value. The maximum allowed frameSize is 16384.
fadePeriods
fade duration expressed as number of convolved blocks. If the desired duration in seconds is dur , then the number of periods can be calculated as fadePeriods = dur * SampleRate.ir / frameSize .
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object Convolution2L extends Serializable

Examples

Value Members

final def !=(arg0: AnyRef): Boolean

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: AnyRef): Boolean

final def ==(arg0: Any): Boolean

def ar(in: GE, kernel: GE, trig: GE = 1, frameSize: GE, fadePeriods: GE = 1): Convolution2L

final def asInstanceOf[T0]: T0

def clone(): AnyRef

final def eq(arg0: AnyRef): Boolean

def equals(arg0: Any): Boolean

def finalize(): Unit

final def getClass(): Class[_]

def hashCode(): Int

final def isInstanceOf[T0]: Boolean

final def ne(arg0: AnyRef): Boolean

final def notify(): Unit

final def notifyAll(): Unit

final def synchronized[T0](arg0: ⇒ T0): T0

def toString(): String

final def wait(): Unit

final def wait(arg0: Long, arg1: Int): Unit

final def wait(arg0: Long): Unit

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