ephasor
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## ephasor

ephasor — produces two outputs: a periodic phase signal and a periodic exponential decaying signal.

## Description

This opcode produces two outputs: a periodic phase signal (like the phasor opcode), and a periodic exponential decaying signal. The latter is synchronised to the former, starting at 1 and then decreasing at the same time as the phase signal increases from 0 to 1. The rate of exponential decay can be controlled by the second parameter.

## Syntax

    aexp,aph ephasor kfreq, kR

## Performance

kfreq - the rate at which the phase and exponential signals are generated

kR - a parameter controlling the decay rate of the exponential signal, 0 < kR < 1. Lower values produce faster decays.

## Examples

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

Example 249. Example of the ephasor opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

    <CsoundSynthesizer>
    <CsOptions>
    </CsOptions>
    <CsInstruments>

    sr=44100
    ksmps=64
    nchnls=2
    0dbfs = 1

    instr 1

    iamp = p4
    ifr = p5
    kfr expon ifr,p3,2*ifr

    kfc expon 2000,p3, 4000
    kq = 10
    kbw = kfc/kq
    kR = 1 - $M_PI*(kbw/sr)

    k1 = kfc/kfr
    kn = int(k1)
    k1 = k1 - kn

    amod,aph ephasor kfr,kR
    aosc1 table aph*kn,-1,1,0,1
    aosc2 table aph*(kn+1),-1,1,0,1

    asig = iamp*(aosc1*(1 - k1) + aosc2*k1)*amod
      outs asig, asig

    endin

    </CsInstruments>
    <CsScore>

    i1 0 10 0.5 220

    e
    </CsScore>
    </CsoundSynthesizer>

## Credits

Author: Victor Lazzarini
2008

New in version 5.10

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