unwrap
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## unwrap

unwrap — Applies a unwrapping operation to an array of phase values.

## Description

Applies a unwrapping operation to a vector of phases stored in an array. The output is an array with phases in the range of [-pi,pi).

## Syntax

    kout[] unwrap kin[]

## Performance

kout[] -- output array containing the unwrapped phases. It will be created if it does not exist.

kin[] -- input array containing the input vector.

## Examples

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

Example 1137. Example of the unwrap opcode.

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

    <CsoundSynthesizer>
    <CsOptions>
    </CsOptions>
    <CsInstruments>
    ksmps = 64

    ifn1 ftgen 1, 0, 512, 7, 0, 512, 0
    ifn2 ftgen 2, 0, 512, 7, 0, 512, 0

    opcode PVA,k[]k[]k,aii
     asig,isize,ihop xin
     iolaps init isize/ihop
     kcnt init 0
     krow init 1
     kIn[] init isize
     kOlph[] init isize/2 + 1
     ifac = (sr/(ihop*2*$M_PI));
     iscal = (2*$M_PI*ihop/isize);
     kfl = 0
     kIn shiftin asig
     if kcnt == ihop then
       kWin[] window kIn,krow*ihop
       kSpec[] rfft kWin
       kMags[] mags kSpec
       kPha[] phs kSpec
       kDelta[] = kPha - kOlph
       kOlph = kPha
       kk = 0
       kDelta unwrap kDelta
       while kk < isize/2 do
        kPha[kk] = (kDelta[kk] + kk*iscal)*ifac
        kk += 1
       od
       krow = (krow+1)%iolaps
       kcnt = 0
       kfl = 1
     endif
     xout kMags,kPha,kfl
     kcnt += ksmps
    endop

    opcode PVS,a,k[]k[]kii
     kMags[],kFr[],kfl,isize,ihop xin
     iolaps init isize/ihop
     ifac = ihop*2*$M_PI/sr;
     iscal = sr/isize
     krow init 0
     kOla[] init isize
     kOut[][] init iolaps,isize
     kPhs[] init isize/2+1
     if kfl == 1 then
      kk = 0
      while kk < isize/2 do
        kFr[kk] = (kFr[kk] - kk*iscal)*ifac
        kk += 1
      od
      kPhs = kFr + kPhs
      kSpec[] pol2rect kMags,kPhs
      kRow[] rifft kSpec
      kWin[] window kRow, krow*ihop
      kOut setrow kWin, krow
      kOla = 0
      kk = 0
      until kk == iolaps do
       kRow getrow kOut, kk
       kOla = kOla + kRow
       kk += 1
      od
      krow = (krow+1)%iolaps
     endif
     xout shiftout(kOla)/iolaps
    endop

    instr 1
    isi = 1024
    ihop = 128

    a1 diskin2 "fox.wav",1,0,1 ; audio input
    kMags[],kPhs[],kflg PVA a1,isi,ihop
    a2 PVS kMags,kPhs,kflg,isi,ihop
       out a2

    endin

    </CsInstruments>
    <CsScore>
    i1 0 10
    </CsScore>
    </CsoundSynthesizer>

## See Also

Vectorial opcodes, array opcodes

## Credits

Author: Victor Lazzarini
NUI Maynooth
2014

New in version 6.04

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