wgclar

Creates a tone similar to a clarinet.

It uses a physical model developed from Perry Cook, but re-coded for Csound.

Syntax

ares wgclar kamp, kfreq, kstiff, iatt, idetk, kngain, kvibf, kvamp \
            [, ifn] [, iminfreq]

Initialization

iatt -- time in seconds to reach full blowing pressure. 0.1 seems to correspond to reasonable playing. A longer time gives a definite initial wind sound.

idetk -- time in seconds taken to stop blowing. 0.1 is a smooth ending

ifn (optional) -- table of shape of vibrato, defaults yo te usual sine table.

iminfreq (optional) -- lowest frequency at which the instrument will play. If it is omitted it is taken to be the same as the initial kfreq. If iminfreq is negative, initialization will be skipped.

Performance

A note is played on a clarinet-like instrument, with the arguments as below.

kamp -- Amplitude of note.

kfreq -- Frequency of note played.

kstiff -- a stiffness parameter for the reed. Values should be negative, and about -0.3. The useful range is approximately -0.44 to -0.18.

kngain -- amplitude of the noise component, about 0 to 0.5

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

kvamp -- amplitude of the vibrato

Examples

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

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

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

instr 1

kfreq = 330
kstiff = -0.3
iatt = 0.1
idetk = 0.1
kngain init p4          ;vary breath
kvibf = 5.735
kvamp = 0.1

asig wgclar .9, kfreq, kstiff, iatt, idetk, kngain, kvibf, kvamp, 1
     outs asig, asig

endin
</CsInstruments>
<CsScore>
f 1 0 16384 10 1        ;sine wave

i 1 0 2 0.2
i 1 + 2 0.5             ;more breath
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 3.47

ifn optional in 6.06