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)).mulAdd(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
- Companion
- class
Type members
Value members
Concrete methods
- Value Params
- 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.
- freq
the frequency in Hertz for which to determine the compensation factor
- root
the base frequency corresponding to a compensation factor of 1.0
- Value Params
- 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.
- freq
the frequency in Hertz for which to determine the compensation factor
- root
the base frequency corresponding to a compensation factor of 1.0
- Value Params
- 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.
- freq
the frequency in Hertz for which to determine the compensation factor
- root
the base frequency corresponding to a compensation factor of 1.0