mirror

Reflects the signal that exceeds the low and high thresholds.

Syntax

ModernClassic

ares = mirror(asig, klow, khigh)
ires = mirror(isig, ilow, ihigh)
kres = mirror(ksig, klow, khigh)

ares mirror asig, klow, khigh
ires mirror isig, ilow, ihigh
kres mirror ksig, klow, khigh

Initialization

isig -- input signal

ilow -- low threshold

ihigh -- high threshold

Performance

xsig -- input signal

klow -- low threshold

khigh -- high threshold

mirror “reflects” the signal that exceeds the low and high thresholds.

This opcode is useful in several situations, such as table indexing or for clipping and modeling a-rate, i-rate or k-rate signals.

Examples

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

<CsoundSynthesizer>
<CsOptions>
; Select audio/midi flags here according to platform
-odac    ;;;realtime audio out
;-iadc    ;;;uncomment -iadc if realtime audio input is needed too
; For Non-realtime ouput leave only the line below:
; -o mirror.wav -W  ;;; for file output any platform
</CsOptions>
<CsInstruments>

sr = 44100 
ksmps = 32 
0dbfs  = 1 
nchnls = 2

instr    1 ; Limit / Mirror / Wrap

igain    = p4                           ;gain
ilevl1   = p5                           ; + level
ilevl2   = p6                           ; - level
imode    = p7                           ;1 = limit, 2 = mirror, 3 = wrap

ain   soundin  "fox.wav"
ain   = ain*igain

if    imode = 1 goto limit
if    imode = 2 goto mirror

asig  wrap  ain, ilevl2, ilevl1
goto  outsignal

limit:
asig  limit  ain, ilevl2, ilevl1
goto  outsignal

mirror:
asig  mirror  ain, ilevl2, ilevl1
outsignal:

outs  asig*.5, asig*.5                  ;mind your speakers

endin

</CsInstruments>
<CsScore>

;           Gain  +Levl -Levl Mode
i1  0  3    4.00  .25  -1.00   1        ;limit
i1  4  3    4.00  .25  -1.00   2        ;mirror
i1  8  3    4.00  .25  -1.00   3        ;wrap
e
</CsScore>
</CsoundSynthesizer>

See also

Signal Limiters

Credits

Author: Gabriel Maldonado
Italy

New in Csound version 3.49