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I have $2$ formulas (mentioned in this page): http://www.vttoth.com/digimix.htm

  1. $Z = 2AB$ if both $A<0.5$ and $B<0.5$
  2. $Z = 2(A+B) – 2AB – 1$ otherwise

where $A$ and $B$ are numbers between $0$ and $1$ (including $0$ and $1$) eg: $0$ $0.2$ $0.9$ $0.34$ $1$

Now, I can understand formula $1$ (if $A$ and $B$ are BOTH greater than $0.5$, then $Z$ is $2AB$, right?) What I can't understand is the part from the second formula that reads $2(A+B)$:

Add $A$ with $B$ and then multiply by $2$ : $2\cdot(A+B)$ is this correct or am I missing something?

Any help?

  • 0
    It says $Z=2AB$ if $A$ and $B$ are both *less* than $0.5$.2011-10-18
  • 0
    That's correct, my mistake!2011-10-18
  • 0
    Side note: the usual solution to mixing audio (and other effects) is to perform intermediate calculations at a greater resolution, then dither on the way back down to the desired output range. For instance, the Pro Tools mix engine uses 48-bit fixed-point arithmetic internally. Multiplying the signals seems... weird.2011-10-18

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