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oscil3

A simple oscillator with cubic interpolation.

oscil3 reads table ifn sequentially and repeatedly at a frequency xcps. The amplitude is scaled by xamp. Cubic interpolation is applied for table look up from internal phase values.

Syntax

ares oscil3 xamp, xcps [, ifn, iphs]
kres oscil3 kamp, kcps [, ifn, iphs]

Initialization

ifn (optional) -- function table number. Requires a wrap-around guard point. Defaults to -1 indicating a sinewave.

iphs (optional) -- 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.

oscil3 is identical to oscili, except that it uses cubic interpolation.

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

If you need to change the oscillator table with a k-rate signal, you can use oscilikt.

Examples

Here is an example of the oscil3 opcode. It uses the file oscil3.csd.

Example of the oscil3 opcode.
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<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 oscil3.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

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

instr 1

kamp = .6
kcps = 440
ifn  = p4

asig oscil kamp, kcps, ifn
     outs asig,asig

endin

instr 2

kamp = .6
kcps = 440
ifn  = p4

asig oscil3 kamp, kcps, ifn
     outs asig,asig

endin
</CsInstruments>
<CsScore>
f1 0 128 10 1                                          ; Sine with a small amount of data
f2 0 128 10 1 0.5 0.3 0.25 0.2 0.167 0.14 0.125 .111   ; Sawtooth with a small amount of data
f3 0 128 10 1 0   0.3 0    0.2 0     0.14 0     .111   ; Square with a small amount of data
f4 0 128 10 1 1   1   1    0.7 0.5   0.3  0.1          ; Pulse with a small amount of data

i 1  0 2 1
i 2  3 2 1
i 1  6 2 2
i 2  9 2 2
i 1 12 2 3
i 2 15 2 3
i 1 18 2 4
i 2 21 2 4

e
</CsScore>
</CsoundSynthesizer>

See also

Basic Oscillators

Credits

Author: John ffitch

New in Csound version 3.50