Description

osciliktp allows phase modulation (which is actually implemented as k-rate frequency modulation, by differentiating phase input). The disadvantage is that there is no amplitude control, and frequency can be varied only at the control-rate. This opcode can be faster or slower than oscilikt, depending on the control-rate.

Syntax

ares osciliktp kcps, kfn, kphs [, istor]

Initialization

istor (optional, defaults to 0) -- Skips initialization.

Performance

ares -- audio-rate ouptut signal.

kcps -- frequency in Hz. Zero and negative values are allowed. However, the absolute value must be less than sr (and recommended to be less than sr/2).

kfn -- function table number. Can be varied at control rate (useful to “morph” waveforms, or select from a set of band-limited tables generated by GEN30).

kphs -- phase (k-rate), the expected range is 0 to 1. The absolute value of the difference of the current and previous value of kphs must be less than ksmps

Examples

Here is an example of the osciliktp opcode. Play osciliktp.csd

<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 osciliktp.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

; Initialize the global variables.
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1

; Instrument #1: osciliktp example
instr 1
  kphs line 0, p3, 4

  a1x osciliktp 220.5, 1, 0
  a1y osciliktp 220.5, 1, -kphs
  a1 =  a1x - a1y

  out a1 * 14000
endin


</CsInstruments>
<CsScore>

; Table #1: Sawtooth wave
f 1 0 3 -2 1 0 -1

; Play Instrument #1 for four seconds.
i 1 0 4
e


</CsScore>
</CsoundSynthesizer>

See Also

oscilikt and oscilikts

Credits

Author: Istvan Varga

New in version 4.22