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Instrument Control: Sensing and Control

follow2

  ar      follow2    asig, katt, krel

Description

A controllable envelope extractor using the algorithm attributed to Jean-Marc Jot.

Performance

asig – the input signal whose envelope is followed

katt – the attack rate (60dB attack time in seconds)

krel – the decay rate (60dB decay time in seconds)

The output tracks the amplitude envelope of the input signal. The rate at which the output grows to follow the signal is controlled by the katt, and the rate at which it decreases in response to a lower amplitude, is controlled by the krel. This gives a smoother envelope than follow.

Example

  a1      follow2    ain, 0.01, .1

Author

John ffitch
University of Bath, Codemist Ltd.
Bath, UK
February, 2000
New in Csound version 4.03


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Instrument Control: Sensing and Control