unwrap — Applies a unwrapping operation to an array of phase values.
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).
kout[] -- output array containing the unwrapped phases. It will be created if it does not exist.
kin[] -- input array containing the input vector.
Here is an example of the unwrap opcode. It uses the file unwrap.csd.
Example 1128. 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>