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lagud

Exponential Lag

Plugin opcode in scugens.

Exponential lag with different smoothing time for up- and downgoing signals. Port of Supercollider's LagUD.

This is essentially the same as the opcode lag except that you can supply a different 60 dB time for ascending and descending signals. This is useful for smoothing out control signals, where "fade in" should be different from "fade out", or to model the attack/release of a gate, etc.

Syntax

aout lagud ain, klagup, klagdown [, initialvalue]
kout lagud kin, klagup, klagdown [, initialvalue]

Initialization

initialvalue If given, sets the internal state. Defaults to the first value passed

Performance

ain -- input signal

klagup -- 60 dB lag time in seconds for the upgoing signal.

klagdown -- 60 dB lag time in seconds for the downgoing signal.

Examples

Here is an example of the lagud opcode. It uses the file lagud.csd.

Example of the lagud opcode.
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<CsoundSynthesizer>
<CsOptions>
</CsOptions>
<CsInstruments>

sr = 44100
ksmps = 128
nchnls = 2
0dbfs = 1.0

instr 1
  kx = randh(2, 1)
  kx2 = lagud(kx, 1.0, 0.1, 1)
  printks "x %f  x2 %f\n", 0.1, kx, kx2
endin

instr 2
  kmidis[] fillarray 60, 65, 60, 65, 60
  ilen = lenarray(kmidis)
  kidx = int(linseg(0, ilen*2, ilen-0.00000001))
  kmidi = mtof(kmidis[kidx])
  afreq = lagud(a(kmidi), 1, 0.1)
  a0 = oscili(0.7, afreq)
  kfreq = lagud(kmidi, 1, 0.1)
  a1 = oscili(0.7, kfreq)
  outch 1, a0
  outch 2, a1
endin

</CsInstruments>
<CsScore>
; i 1 0 10
i 2 0 12

</CsScore>
</CsoundSynthesizer>

See also

Standard Filters: Control signal filters

Credits

By: Eduardo Moguillansky 2017