c2r

Real to complex format conversion.

Converts a complex-valued input array into a real-valued array, by removing its imaginary part. The output array will be half the size of the input. This is a utility operation to facilitate complex-valued operations where the result is purely real.

Syntax

kout[] c2r kin[]

Performance

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

kin[] -- input array containing the complex-valued real-imaginary input.

Examples

Here is an example of the c2r opcode. It uses the file c2r.csd.

<CsoundSynthesizer>
<CsOptions>
-d -o dac
</CsOptions>
<CsInstruments>
ksmps = 64

instr 1
ifftsize = 1024
kcnt init 0
kIn[] init  ifftsize
kOut[] init ifftsize

a1 oscili 0dbfs/2, 440

if kcnt >= ifftsize then
 kCmplx[] r2c kIn
 kSpec[] fft kCmplx
 kCmplx fftinv kSpec
 kOut c2r kCmplx
 kcnt = 0 
endif

kIn[] shiftin a1
a2 shiftout kOut
kcnt += ksmps
   out a2
endin
</CsInstruments>
<CsScore>
i1 0 10
</CsScore>
</CsoundSynthesizer>

See Also

Vectorial opcodes

array opcodes

Array-based spectral opcodes

Credits

Author: Victor Lazzarini
NUI Maynooth
2014

New in version 6.04