oscil

oscil --  A simple oscillator.

Description

Table ifn is incrementally sampled modulo the table length and the value obtained is multiplied by amp.

Syntax

ar oscil xamp, xcps, ifn [, iphs]

kr oscil kamp, kcps, ifn [, iphs]

Initialization

ifn -- function table number. Requires a wrap-around guard point.

iphs (optional, default=0) -- initial phase of sampling, expressed as a fraction of a cycle (0 to 1). A negative value will cause phase initialization to be skipped. The default value is 0.

Performance

kamp, xamp -- amplitude

kcps, xcps -- frequency in cycles per second.

The oscil opcode generates periodic control (or audio) signals consisting of the value of kamp(xamp)times the value returned from control rate (audio rate) sampling of a stored function table. The internal phase is simultaneously advanced in accordance with the kcps or xcps input value.

Examples

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

Example 1. Example of the oscil opcode.

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

; Instrument #1 - a basic oscillator.
instr 1
  kamp = 10000
  kcps = 440
  ifn = 1

  a1 oscil kamp, kcps, ifn
  out a1
endin
/* oscil.orc */
        
/* oscil.sco */
; Table #1, a sine wave.
f 1 0 16384 10 1

; Play Instrument #1 for 2 seconds.
i 1 0 2
e
/* oscil.sco */
        

See Also

oscili, oscil3

Credits

Example written by Kevin Conder.