wguide1

wguide1 — A simple waveguide model consisting of one delay-line and one first-order lowpass filter.

Description

A simple waveguide model consisting of one delay-line and one first-order lowpass filter.

Syntax

ares wguide1 asig, xfreq, kcutoff, kfeedback

Performance

asig -- the input of excitation noise.

xfreq -- the frequency (i.e. the inverse of delay time) Changed to x-rate in Csound version 3.59.

kcutoff -- the filter cutoff frequency in Hz.

kfeedback -- the feedback factor.

wguide1 is the most elemental waveguide model, consisting of one delay-line and one first-order lowpass filter.

Implementing waveguide algorithms as opcodes, instead of orc instruments, allows the user to set kr different than sr, allowing better performance particulary when using real-time.

wguide1.

wguide1.

Examples

Here is an example of the wguide1 opcode. It uses the file wguide1.csd.

Example 1018. Example of the wguide1 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 wguide1.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

; Initialize the global variables.
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1

; Instrument #1 - a simple noise waveform.
instr 1
  ; Generate some noise.
  asig noise 20000, 0.5

  out asig
endin

; Instrument #2 - a waveguide example.
instr 2
  ; Generate some noise.
  asig noise 20000, 0.5

  ; Run it through a wave-guide model.
  kfreq init 200
  kcutoff init 3000
  kfeedback init 0.8
  awg1 wguide1 asig, kfreq, kcutoff, kfeedback

  out awg1
endin


</CsInstruments>
<CsScore>

; Play Instrument #1 for 2 seconds.
i 1 0 2
; Play Instrument #2 for 2 seconds.
i 2 2 2
e


</CsScore>
</CsoundSynthesizer>


See Also

wguide2

Credits

Author: Gabriel Maldonado
Italy
October 1998

Example written by Kevin Conder.

New in Csound version 3.49