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Advanced Audio Recording 
Introduction to Cubic residue diffusers In a former article we explained some aspects of common QRDiffusers known as Schröderdiffusers. Here a 2Dstructure is shown.
A common method of defining the wells' depth is to use the residue value of a division from the square of the coordinate and a prime figure. Unlike as with common QRdiffusers both dimensions are covered which leads to more a scattering behavior than known from 1DQRDDesigns. Depending on the coordinate shift and the modulo value and used for the division structures can be achieved
An optimized 2Dquadratic residue diffuser using 12 wells per period from 13  fully symmetrical. Here the equation is Z = (X*X + Y*Y) MOD 13
An optimized 2Dquadratic residue diffuser using 12 wells per period from 13 possible to become fully symmetrical. Unlike above the equation is Z = (X*X * Y*Y) MOD 13
Conclusion and Summary Optimized QRDequations can be used to obtain a fully symmetrical 2Ddiffuser.
See the former article about QRDdiffusers
You may also want to have a look at the article Studio Design

© 2007 J.S. 