interp — Converts a control signal to an audio signal using linear interpolation.
iskip (optional, default=0) -- initial disposition of internal save space (see reson). The default value is 0.
imode (optional, default=0) -- sets the initial output value to the first k-rate input instead of zero. The following graphs show the output of interp with a constant input value, in the original, when skipping init, and in the new mode:
ksig -- input k-rate signal.
interp converts a control signal to an audio signal. It uses linear interpolation between successive kvals.
Here is an example of the interp opcode. It uses the file interp.csd.
Example 220. Example of the interp 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 interp.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; Initialize the global variables. sr = 8000 kr = 8 ksmps = 1000 nchnls = 1 ; Instrument #1 - a simple instrument. instr 1 ; Create an amplitude envelope. kamp linseg 0, p3/2, 20000, p3/2, 0 ; The amplitude envelope will sound rough because it ; jumps every ksmps period, 1000. a1 oscil kamp, 440, 1 out a1 endin ; Instrument #2 - a smoother sounding instrument. instr 2 ; Create an amplitude envelope. kamp linseg 0, p3/2, 25000, p3/2, 0 aamp interp kamp ; The amplitude envelope will sound smoother due to ; linear interpolation at the higher a-rate, 8000. a1 oscil aamp, 440, 1 out a1 endin </CsInstruments> <CsScore> ; Table #1, a sine wave. f 1 0 256 10 1 ; Play Instrument #1 for two seconds. i 1 0 2 ; Play Instrument #2 for two seconds. i 2 2 2 e </CsScore> </CsoundSynthesizer>