lfo

Name

lfo --  A low frequency oscillator of various shapes.

Description

A low frequency oscillator of various shapes.

Syntax

kr lfo kamp, kcps [, itype]
ar lfo kamp, kcps [, itype]

Initialization

itype (optional, default=0) -- determine the waveform of the oscillator. Default is 0.

The sine wave is implemented as a 4096 table and linear interpolation. The others are calculated.

Performance

kamp -- amplitude of output

kcps -- frequency of oscillator

Examples

Here is an example of the lfo opcode. It uses the files lfo.orc and lfo.sco.

Example 15-1. Example of the lfo opcode.

/* lfo.orc */
; Initialize the global variables.
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1

; Instrument #1.
instr 1
  kamp = 10
  kcps = 5
  itype = 4

  k1 lfo kamp, kcps, itype
  ar oscil p4, p5+k1, 1
  out ar
endin
/* lfo.orc */
        
/* lfo.sco */
; Table #1: an ordinary sine wave.
f 1 0 32768 10 1

; p4 = amplitude of the output signal.
; p5 = frequency (in cycles per second) of the output signal.
; Play Instrument #1 for two seconds.
i 1 0 2 10000 220
e
/* lfo.sco */
        

Credits

Author: John ffitch
University of Bath/Codemist Ltd.
Bath, UK
November 1998

New in Csound version 3.491