marimba
Prev | Orchestra Opcodes and Operators | Next

## 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 560. 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

Prev | Up | Next
maparray | Home | massign