Envelope

streaming mode | Envelope/SFX category

Inputs

  • signal (real) - the input signal

Outputs

  • signal (real) - the resulting envelope of the signal

Parameters

  • applyRectification (bool ∈ {true, false}, default = true) :

    whether to apply rectification (envelope based on the absolute value of signal)

  • attackTime (real ∈ [0, ∞), default = 10) :

    the attack time of the first order lowpass in the attack phase [ms]

  • releaseTime (real ∈ [0, ∞), default = 1500) :

    the release time of the first order lowpass in the release phase [ms]

  • sampleRate (real ∈ (0, ∞), default = 44100) :

    the audio sampling rate [Hz]

Description

This algorithm computes the envelope of a signal by applying a non-symmetric lowpass filter on a signal. By default it rectifies the signal, but that is optional.

References:

[1] U. Zölzer, Digital Audio Signal Processing, John Wiley & Sons Ltd, 1997, ch.7

Source code

See also

Envelope (standard)