phasor
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## phasor

phasor — Produce a normalized moving phase value.

## Description

Produce a normalized moving phase value.

## Syntax

    ares phasor xcps [, iphs]

    kres phasor kcps [, iphs]

## Initialization

iphs (optional) -- initial phase, expressed as a fraction of a cycle (0 to 1). A negative value will cause phase initialization to be skipped. The default value is zero.

## Performance

An internal phase is successively accumulated in accordance with the kcps or xcps frequency to produce a moving phase value, normalized to lie in the range 0 <= phs < 1.

When used as the index to a table unit, this phase (multiplied by the desired function table length) will cause it to behave like an oscillator.

Note that phasor is a special kind of integrator, accumulating phase increments that represent frequency settings.

## Examples

Here is an example of the phasor opcode. It uses the file phasor.csd.

Example 760. Example of the phasor 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
    -odac     ;;;realtime audio out
    ;-iadc    ;;;uncomment -iadc if real audio input is needed too
    ; For Non-realtime ouput leave only the line below:
    ; -o phasor.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    sr = 44100
    ksmps = 32
    nchnls = 2
    0dbfs  = 1

    instr 1

    ifn = 1			;read table 1 with our index
    ixmode = 1
    kndx phasor p4
    kfrq table kndx, ifn, ixmode
    asig poscil .6, kfrq, 2	;re-synthesize with sine
         outs asig, asig

    endin
    </CsInstruments>
    <CsScore>
    f 1 0 1025 -7 200 1024 2000 ;a line from 200 to 2,000
    f 2 0 16384 10 1;sine wave

    i 1 0 1 1	;once per second
    i 1 2 2 .5	;once per 2 seconds
    i 1 5 1 2	;twice per second
    e
    </CsScore>
    </CsoundSynthesizer>

A musical example featuring the phasor opcode: PhasorTablei_Cucchi.csd by Stefano Cucchi.

## See also

Phasors

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