wgbowedbar

wgbowedbar — A physical model of a bowed bar.

Description

A physical model of a bowed bar, belonging 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.

Example 1011. Example of the wgbowedbar 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
-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>


Credits

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

New in Csound version 4.07