lpshold — Generate control signal consisting of held segments.


Generate control signal consisting of held segments delimited by two or more specified points. The entire envelope is looped at kfreq rate. Each parameter can be varied at k-rate.


ksig lpshold kfreq, ktrig, ktime0, kvalue0  [, ktime1] [, kvalue1] \
      [, ktime2] [, kvalue2] [...]


ksig -- Output signal

kfreq -- Repeat rate in Hz or fraction of Hz

ktrig -- If non-zero, retriggers the envelope from start (see trigger opcode), before the envelope cycle is completed.

ktime0...ktimeN -- Times of points; expressed in fraction of a cycle

kvalue0...kvalueN -- Values of points

lpshold is similar to loopseg, but can generate only horizontal segments, i.e. holds values for each time interval placed between ktimeN and ktimeN+1. It can be useful, among other things, for melodic control, like old analog sequencers.


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

Example 244. Example of the lpshold opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

; Select audio/midi flags here according to platform
; Audio out   Audio in    No messages
-odac           -iadc     -d     ;;;RT audio I/O
; For Non-realtime ouput leave only the line below:
; -o lpshold.wav -W ;;; for file output any platform

; Initialize the global variables.
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1

; Instrument #1
instr 1
  kfreq line 1, p3, 20

  klp lpshold kfreq, 0, 0, 0, p3*0.25, 20000, p3*0.75, 0

  a1 oscil klp, 440, 1
  out a1


; Table #1, a sine wave.
f 1 0 16384 10 1

; Play Instrument #1 for five seconds.
i 1 0 5


See Also



Author: Gabriel Maldonado

New in Version 4.13