bamboo — Semi-physical model of a bamboo sound.


bamboo is a semi-physical model of a bamboo sound. It is one of the PhISEM percussion opcodes. PhISEM (Physically Informed Stochastic Event Modeling) is an algorithmic approach for simulating collisions of multiple independent sound producing objects.


ares bamboo kamp, idettack [, inum] [, idamp] [, imaxshake] [, ifreq] \
      [, ifreq1] [, ifreq2]


idettack -- period of time over which all sound is stopped

inum (optional) -- The number of beads, teeth, bells, timbrels, etc. If zero, the default value is 1.25.

idamp (optional) -- the damping factor, as part of this equation:

damping_amount = 0.9999 + (idamp * 0.002)

The default damping_amount is 0.9999 which means that the default value of idamp is 0. The maximum damping_amount is 1.0 (no damping). This means the maximum value for idamp is 0.05.

The recommended range for idamp is usually below 75% of the maximum value.

imaxshake (optional, default=0) -- amount of energy to add back into the system. The value should be in range 0 to 1.

ifreq (optional) -- the main resonant frequency. The default value is 2800.

ifreq1 (optional) -- the first resonant frequency. The default value is 2240.

ifreq2 (optional) -- the second resonant frequency. The default value is 3360.


kamp -- Amplitude of output. Note: As these instruments are stochastic, this is only an approximation.


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

Example 90. Example of the bamboo 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
-odac     ;;;RT audio out
;-iadc    ;;;uncomment -iadc if RT audio input is needed too
; For Non-realtime ouput leave only the line below:
; -o bamboo.wav -W ;;; for file output any platform

sr = 44100
ksmps = 32
nchnls = 2

instr 1
asig  bamboo p4, 0.01,0, 0, 0, 8000
      outs asig, asig



i1 0 1 20000
i1 2 1 20000


See Also

Models and Emulations


Author: Perry Cook, part of the PhISEM (Physically Informed Stochastic Event Modeling)
Adapted by John ffitch
University of Bath, Codemist Ltd.
Bath, UK

New in Csound version 4.07

Added notes by Rasmus Ekman on May 2002.