Appendix 1: How Does Dv-Dosc Behave With Respect To Wst Criteria; Appendix 2: How Does The Dosc Waveguide Work; Figure 31: Dosc Waveguide - Internal Section - L-Acoustics dV-DOSC Operator's Manual

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APPENDIX 2:
HOW DOES THE DOSC WAVEGUIDE WORK?
There is no mysticism surrounding the DOSC waveguide. It is simply the result of careful analysis of
the wave path through the waveguide and the resulting wave-front shape.
With respect to the above figure, the wavefront emerging from a horn is the result of constant time
arrivals for all possible wave paths radiated by the driver exit. The two examples shown produce
curved wavefronts that obviously cannot meet the second WST criterion.
Figure 31: DOSC Waveguide – Internal Section
By comparison, the DOSC waveguide acts as a time alignment plug, delaying the arrival times of
every possible wave path to be the same value at the rectangular exit of the device. The internal
plug is a truncated conical piece that looks like a "tomahawk". This plug and its outer housing are
precisely constructed according to specific ratios between depth, height and cone angle in order to
produce the flat constant phase wavefront and tight manufacturing tolerances are obtained through
the use of computer aided design and manufacturing (CAD/CAM) techniques. As shown in AES
preprint 5488 ''Wavefront Sculpture Technology'', the deviation from a flat wavefront must be less
than λ/4 at the highest operating frequency - this corresponds to less than 5 mm of curvature at 16
kHz and experiments have shown that the DOSC waveguide provides less than 4 mm of curvature.
DOSC waveguide technology is patented on an international basis.
(n°0331566 in Europe, n°5163167 in North America).
dV-DOSC dV-SUB Manual V2.0
Nov 2001
129

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