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 297. 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>