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# vbapz

vbapz -- Writes a multi-channel audio signal to a ZAK array.

## Description

Writes a multi-channel audio signal to a ZAK array.

## Syntax

vbapz inumchnls, istartndx, asig, iazim [, ielev] [, ispread]

## Initialization

inumchnls -- number of channels to write to the ZA array. Must be in the range 2 - 256.

istartndx -- first index or position in the ZA array to use

iazim -- azimuth angle of the virtual source

ielev (optional) -- elevation angle of the virtual source

ispread (optional) -- spreading of the virtual source (range 0 - 100). If value is zero, conventional amplitude panning is used. When ispread is increased, the number of loudspeakers used in panning increases. If value is 100, the sound is applied to all loudspeakers.

## Performance

asig -- audio signal to be panned

The opcode vbapz is the multiple channel analog of the opcodes like vbap4, working on inumchnls and using a ZAK array for output.

## Examples

Example 1. 2-D panning example with stationary virtual sources

      sr      =          4100
      kr      =           441
      ksmps   =           100
      nchnls  =             4
      vbaplsinit         2, 6,  0, 45, 90, 135, 200, 245, 290, 315

              instr 1
      asig    oscil      20000, 440, 1
      a1,a2,a3,a4,a5,a6,a7,a8   vbap8  asig, p4, 0, 20 ;p4 = azimuth

      ;render twice with alternate outq statements
      ;  to obtain two 4 channel .wav files:

              outq       a1,a2,a3,a4
      ;       outq       a5,a6,a7,a8
              endin

## Reference

Ville Pulkki: "Virtual Sound Source Positioning Using Vector Base Amplitude Panning" Journal of the Audio Engineering Society, 1997 June, Vol. 45/6, p. 456.

## See Also

vbap16, vbap16move, vbap4, vbap4move, vbap8, vbap8move, vbaplsinit, vbapzmove

## Credits

John ffitch
University of Bath/Codemist Ltd.
Bath, UK
May 2000

New in Csound Version 4.07

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