oscils — A simple, fast sine oscillator
Simple, fast sine oscillator, that uses only one multiply, and two add operations to generate one sample of output, and does not require a function table.
iamp -- output amplitude.
icps -- frequency in Hz (may be zero or negative, however the absolute value must be less than sr/2).
iphs -- start phase between 0 and 1.
iflg -- sum of the following values:
2: use double precision even if Csound was compiled to use floats. This improves quality (especially in the case of long performance time), but may be up to twice as slow.
1: skip initialization.
Here is an example of the oscils opcode. It uses the file oscils.csd.
Example 262. Example of the oscils 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 oscils.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>
; Initialize the global variables.
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1
; Instrument #1 - a fast sine oscillator.
instr 1
iamp = 10000
icps = 440
iphs = 0
a1 oscils iamp, icps, iphs
out a1
endin
</CsInstruments>
<CsScore>
; Play Instrument #1 for 2 seconds.
i 1 0 2
e
</CsScore>
</CsoundSynthesizer>