osciliktp
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## osciliktp

osciliktp — A linearly interpolated oscillator that allows allows phase modulation.

## 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. It uses the file osciliktp.csd.

Example 640. Example of the osciliktp 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 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

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