vbapgmove
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## vbapgmove

vbapgmove — Calculates the gains for a sound location between multiple channels with moving virtual sources.

## Description

Calculates the gains for a sound location between multiple channels with moving virtual sources.

## Syntax

    kr1[, kr2...] vbapgmove idur, ispread, ifldnum, ifld1 \
          [, ifld2] [...]

    karray[] vbapgmove idur, ispread, ifldnum, ifld1 \
          [, ifld2] [...]

## Initialization

idur -- the duration over which the movement takes place.

ispread -- 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.

ifldnum -- number of fields (absolute value must be 2 or larger). If ifldnum is positive, the virtual source movement is a polyline specified by given directions. Each transition is performed in an equal time interval. If ifldnum is negative, specified angular velocities are applied to the virtual source during specified relative time intervals (see below).

ifld1, ifld2, ... -- azimuth angles or angular velocities, and relative durations of movement phases (see below).

## Performance

vbapgmove allows the use of moving virtual sources. If ifldnum is positive, the fields represent directions of virtual sources and equal times, iazi1, [iele1,] iazi2, [iele2,], etc. The position of the virtual source is interpolated between directions starting from the first direction and ending at the last. Each interval is interpolated in time that is fraction total_time / number_of_intervals of the duration of the sound event.

If ifldnum is negative, the fields represent angular velocities and equal times. The first field is, however, the starting direction, iazi1, [iele1,] iazi_vel1, [iele_vel1,] iazi_vel2, [iele_vel2,] .... Each velocity is applied to the note that is fraction total_time / number_of_velocities of the duration of the sound event. If the elevation of the virtual source becomes greater than 90 degrees or less than 0 degrees, the polarity of angular velocity is changed. Thus the elevational angular velocity produces a virtual source that moves up and down between 0 and 90 degrees.

| Warning
Please note that all vbap panning opcodes require the vbap system to be initialized using vbaplsinit.

## Examples

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

Example 975. Example of the vbapg opcode.

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

    <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 vbapgmove.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    sr = 44100
    ksmps = 32
    nchnls = 4	;quad
    0dbfs  = 1

    vbaplsinit 2, 4, 0, 90, 180, 270

    instr 1

    asig diskin2 "beats.wav", 1, 0, 1		;loop beats.wav

    k0,k1,k2,k3 vbapgmove  p3, 1, 2, 310, 180	;change movement of soundsource in
         outq k0*asig,k1*asig,k2*asig,k3*asig	;the rear speakers

    endin
    </CsInstruments>
    <CsScore>

    i 1 0 5

    e
    </CsScore>
    </CsoundSynthesizer>

## 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

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

## Credits

Author: Ville Pulkki
Sibelius Academy Computer Music Studio
Laboratory of Acoustics and Audio Signal Processing
Helsinki University of Technology
Helsinki, Finland
May 2000
Author: John ffitch
July 2012, Sept 2013

New in Csound Version 5.17.13

Array outputs new in Csound Version 6.01

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