AllpassC:

Filter: Schroeder allpass delay line with cubic interpolation.

Source: Delays.sc

A Schroeder allpass filter is given by the difference equations

where `x(t)`

is the input signal, `y(t)`

is the output signal, `D`

is the delay time, and `k`

is the allpass coefficient.

In this UGen, `k`

is computed as `k == 0.001 ** (delay / decay.abs) * decay.sign`

(0.001 is -60 dBFS).

See also AllpassN which uses no interpolation, and AllpassL which uses linear interpolation. Cubic interpolation is more computationally expensive than linear, but more accurate.

From superclass: CombN

From superclass: CombN

in |
The input signal. |

maxdelaytime |
The maximum delay time in seconds. Used to initialize the delay buffer size. |

delaytime |
Delay time in seconds. |

decaytime |
Time for the echoes to decay by 60 decibels. If this time is negative then the feedback coefficient will be negative, thus emphasizing only odd harmonics at an octave lower. |

mul |
The output will be multiplied by this value. |

add |
This value will be added to the output. |

helpfile source: https://github.com/supercollider/supercollider/tree/3.13/HelpSource/Classes/AllpassC.schelp

link::Classes/AllpassC::

link::Classes/AllpassC::