marimba

marimba — Physical model related to the striking of a wooden block.

Description

Audio output is a tone related to the striking of a wooden block as found in a marimba. The method is a physical model developed from Perry Cook but re-coded for Csound.

Syntax

ares marimba kamp, kfreq, ihrd, ipos, imp, kvibf, kvamp, ivibfn, idec \
      [, idoubles] [, itriples]

Initialization

ihrd -- the hardness of the stick used in the strike. A range of 0 to 1 is used. 0.5 is a suitable value.

ipos -- where the block is hit, in the range 0 to 1.

imp -- a table of the strike impulses. The file marmstk1.wav is a suitable function from measurements and can be loaded with a GEN01 table. It is also available at ftp://ftp.cs.bath.ac.uk/pub/dream/documentation/sounds/modelling/.

ivfn -- shape of vibrato, usually a sine table, created by a function

idec -- time before end of note when damping is introduced

idoubles (optional) -- percentage of double strikes. Default is 40%.

itriples (optional) -- percentage of triple strikes. Default is 20%.

Performance

kamp -- Amplitude of note.

kfreq -- Frequency of note played.

kvibf -- frequency of vibrato in Hertz. Suggested range is 0 to 12

kvamp -- amplitude of the vibrato

Examples

Here is an example of the marimba opcode. It uses the file marimba.csd, and marmstk1.wav.

Example 455. Example of the marimba opcode.

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

<CsoundSynthesizer>
<CsOptions>
; 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 marimba.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

; Initialize the global variables.
sr = 44100
ksmps = 128
nchnls = 2

; Instrument #1.
instr 1
  ifreq = cpspch(p4)
  ihrd = 0.1
  ipos = 0.561
  imp = 1
  kvibf = 6.0
  kvamp = 0.05
  ivibfn = 2
  idec = 0.6

  a1 marimba 20000, ifreq, ihrd, ipos, imp, kvibf, kvamp, ivibfn, idec, 20, 10

  outs a1, a1
endin


</CsInstruments>
<CsScore>

; Table #1, the "marmstk1.wav" audio file.
f 1 0 256 1 "marmstk1.wav" 0 0 0
; Table #2, a sine wave for the vibrato.
f 2 0 128 10 1

; Play Instrument #1 for one second.
i 1 0 1 8.09
i 1 + 0.5 8.00
i 1 + 0.5 7.00
i 1 + 0.25 8.02
i 1 + 0.25 8.01
i 1 + 0.25 7.09
i 1 + 0.25 8.02
i 1 + 0.25 8.01
i 1 + 0.25 7.09
i 1 + 0.3333 8.09
i 1 + 0.3333 8.02
i 1 + 0.3334 8.01
i 1 + 0.25 8.00
i 1 + 0.3333 8.09
i 1 + 0.3333 8.02
i 1 + 0.25 8.01
i 1 + 0.3333 7.00
i 1 + 0.3334 6.00

e


</CsScore>
</CsoundSynthesizer>


See Also

vibes

Credits

Author: John ffitch (after Perry Cook)
University of Bath, Codemist Ltd.
Bath, UK

New in Csound version 3.47