wgbowedbar

A physical model of a bowed bar.

It belongs to the Perry Cook family of waveguide instruments.

Syntax

ares wgbowedbar kamp, kfreq, kpos, kbowpres, kgain [, iconst] [, itvel] \
                [, ibowpos] [, ilow]

Initialization

iconst (optional, default=0) -- an integration constant. Default is zero.

itvel (optional, default=0) -- either 0 or 1. When itvel = 0, the bow velocity follows an ADSR style trajectory. When itvel = 1, the value of the bow velocity decays in an exponentially.

ibowpos (optional, default=0) -- the position on the bow, which affects the bow velocity trajectory.

ilow (optional, default=0) -- lowest frequency required

Performance

kamp -- amplitude of signal

kfreq -- frequency of signal

kpos -- position of the bow on the bar, in the range 0 to 1

kbowpres -- pressure of the bow (as in wgbowed)

kgain -- gain of filter. A value of about 0.809 is suggested.

Examples

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

<CsoundSynthesizer>
<CsOptions>
; Select audio/midi flags here according to platform
-odac     ;;;realtime audio out
;-iadc    ;;;uncomment -iadc if RT audio input is needed too
; For Non-realtime ouput leave only the line below:
; -o wgbowedbar.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

sr = 44100
ksmps = 32
nchnls = 2
0dbfs  = 1

instr 1

kp   = p6
asig wgbowedbar p4, cpspch(p5), 1, kp, 0.995
     outs asig, asig

endin
</CsInstruments>
<CsScore>
s
i1 0 .5 .5 7.00 .1      ;short sound
i1 + .  .3 8.00 .1
i1 + .  .5 9.00 .1
s
i1 0 .5 .5 7.00  1      ;longer sound
i1 + .  .3 8.00  1
i1 + .  .5 9.00  1

e
</CsScore>
</CsoundSynthesizer>

See also

Waveguide Physical Modeling

Credits

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

New in Csound version 4.07