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 files interp.orc and interp.sco.
Example 196. Example of the interp opcode.
/* interp.orc */ ; 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 /* interp.orc */
/* interp.sco */ ; 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 /* interp.sco */