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spsend

Generates output signals based on a previously defined space opcode.

The output signals from spsend are derived from the values given for xy and reverb in the space and are ready to be sent to local or global reverb units (see example below).

Syntax

a1, a2, a3, a4 spsend

Performance

The configuration of the xy coordinates in space places the signal in the following way:

  • a1 is -1, 1
  • a2 is 1, 1
  • a3 is -1, -1
  • a4 is 1, -1

This assumes a loudspeaker set up as a1 is left front, a2 is right front, a3 is left back, a4 is right back. Values greater than 1 will result in sounds being attenuated, as if in the distance. space considers the speakers to be at a distance of 1; smaller values of xy can be used, but space will not amplify the signal in this case. It will, however balance the signal so that it can sound as if it were within the 4 speaker space. x=0, y=1, will place the signal equally balanced between left and right front channels, x=y=0 will place the signal equally in all 4 channels, and so on. Although there must be 4 output signals from space, it can be used in a 2 channel orchestra. If the xy's are kept so that Y>=1, it should work well to do panning and fixed localization in a stereo field.

Examples

Here is a stereo example of the spsend opcode. It uses the file spsend.csd.

Example of the spsend opcode.
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<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 spsend.wav -W ;;; for file output any platform
</CsOptions> 
<CsInstruments>

sr = 44100 
ksmps = 32 
0dbfs  = 1 
nchnls = 2      ;stereo output

ga1 init 0
ga2 init 0

instr 1 ;sends different amounts to reverb

irev = p6
asig diskin2 "fox.wav", 1
a1, a2, a3, a4 space asig, 0, 0, irev, p4, p5   ;take position values from p4, p5
ar1, ar2, ar3, ar4 spsend                       ;send to reverb

ga1 = ga1+ar1
ga2 = ga2+ar2
    outs a1, a2

endin

instr 99 ; reverb instrument

a1 reverb2 ga1, 2.5, .5
a2 reverb2 ga2, 2.5, .5
   outs a1, a2

ga1=0
ga2=0

endin

</CsInstruments>
<CsScore>
;WITH REVERB
;place the sound in the left speaker and near
i1 0 1 -1 1 .1
;place the sound in the right speaker and far
i1 1 1 45 45 .1
;place the sound equally between left and right and in the middle ground distance
i1 2 1 0 12 .1

;NO REVERB
;place the sound in the left speaker and near
i1 6 1 -1 1 0
;place the sound in the right speaker and far
i1 7 1 45 45 0
;place the sound equally between left and right and in the middle ground distance
i1 8 1 0 12 0

i 99 0 12       ;keep reverb active all the time
e
</CsScore>
</CsoundSynthesizer>

See also

Panning and Spatialization: Amplitude spatialization

Credits

Author: Richard Karpen
Seattle, WA USA
1998

New in Csound version 3.48