cmplxprod
Prev | Orchestra Opcodes and Operators | Next

## cmplxprod

cmplxprod — Complex product of two arrays.

## Description

Calculates the complex product of two arrays of the same size and in real-imaginary interleaved format.

## Syntax

    kout[] cmplxprod kin1[], kin2[]

## Performance

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

kin1[], kin2[] -- input arrays containing the complex inputs.

## Examples

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

Example 125. Example of the cmplxprod opcode.

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

    <CsoundSynthesizer>
    <CsOptions>
    -d -o dac
    </CsOptions>
    <CsInstruments>
    ;ksmps needs to be an integer div of hopsize
    ksmps = 64
    0dbfs = 1

    instr 1

     ihopsize = 256   ; hopsize
     ifftsize = 1024  ; FFT size
     iolaps = ifftsize/ihopsize ; overlaps
     ibw = sr/ifftsize ; bin bandwidth
     kcnt init 0    ; counting vars
     krow init 0

     kOla[] init ifftsize ; overlap-add buffer
     kIn[] init ifftsize  ; input buffer
     kFil[] init ifftsize  ; filter buffer
     kOut[][] init iolaps, ifftsize ; output buffers

     kfrst init 1
     if kfrst == 1 then
      copyf2array kFil,1
      kfrst = 0
     endif

     a1 diskin2 "fox.wav",1,0,1 ; audio input

     /* every hopsize samples */
     if kcnt == ihopsize then
       /* window and take FFT */
       kWin[] window kIn,krow*ihopsize
       kSpec[] rfft kWin

       kProd[] cmplxprod kSpec, kFil

       /* IFFT + window */
       kRow[] irfft kProd
       kWin window kRow, krow*ihopsize
       /* place it on out buffer */
       kOut setrow kWin, krow

       /* zero the ola buffer */
       kOla = 0
       /* overlap-add */
       ki = 0
       until ki == iolaps do
         kRow getrow kOut, ki
         kOla = kOla + kRow
         ki += 1
       od

      /* update counters */
      krow = (krow+1)%iolaps
      kcnt = 0
     endif

     /* shift audio in/out of buffers */
     kIn shiftin a1
     a2 shiftout kOla
        out a2/iolaps

     /* increment counter */
     kcnt += ksmps

    endin

    </CsInstruments>
    <CsScore>
    f1 0 1024 7  0 64 0.1 64 0.2 128 0.5 256 1 512 1
    i1 0 10
    </CsScore>
    </CsoundSynthesizer>

## See Also

Vectorial opcodes, array

## Credits

Author: Victor Lazzarini
NUI Maynooth
2014

New in version 6.04

Prev | Up | Next
clockon | Home | cngoto