Packages

object AmpComp extends Serializable

A UGen that produces a psychoacoustic amplitude compensation factor for a given frequency.

Implements the formula: (root / freq).pow(exp)

Higher frequencies are normally perceived as louder, therefore AmpComp outputs lower values for them. For example, with default parameters, the pitch C4 (frequency 262 Hz) produces the base factor of 1.0, whereas a pitch one octave up, C5 (or 523 Hz) produces a factor of 0.793719 (an attenuation of -2 dB).

An alternative is AmpCompA that better models the bell-shaped equal loudness contours of the hearing system. Especially note that the output of this UGen can become very high for frequencies much lower than the root parameter.

Examples
// activate with mouse button
play {
  val freq = MouseX.kr(300, 15000, 1)
  val mod  = freq * SinOsc.ar(MouseY.kr(3, 200, 1)).madd(0.5, 1)
  val corr = AmpComp.ar(mod, 300) * 2
  val amp  = Select.ar(MouseButton.kr(lag = 0), Seq(DC.ar(1), corr))
  SinOsc.ar(mod) * 0.1 * amp
}
See also

AmpCompA

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  4. def ar(freq: GE = 261.626f, root: GE = 261.626f, expon: GE = 0.3333f): AmpComp

    freq

    the frequency in Hertz for which to determine the compensation factor

    root

    the base frequency corresponding to a compensation factor of 1.0

    expon

    the exponent determines how steep the compensation curve decreases for increasing frequencies. In general, the louder a signal is played, the shallower the equal loudness contours become.

  5. def ar: AmpComp
  6. final def asInstanceOf[T0]: T0
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  7. def clone(): AnyRef
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  13. def ir(freq: GE = 261.626f, root: GE = 261.626f, expon: GE = 0.3333f): AmpComp

    freq

    the frequency in Hertz for which to determine the compensation factor

    root

    the base frequency corresponding to a compensation factor of 1.0

    expon

    the exponent determines how steep the compensation curve decreases for increasing frequencies. In general, the louder a signal is played, the shallower the equal loudness contours become.

  14. def ir: AmpComp
  15. final def isInstanceOf[T0]: Boolean
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  16. def kr(freq: GE = 261.626f, root: GE = 261.626f, expon: GE = 0.3333f): AmpComp

    freq

    the frequency in Hertz for which to determine the compensation factor

    root

    the base frequency corresponding to a compensation factor of 1.0

    expon

    the exponent determines how steep the compensation curve decreases for increasing frequencies. In general, the louder a signal is played, the shallower the equal loudness contours become.

  17. def kr: AmpComp
  18. final def ne(arg0: AnyRef): Boolean
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