[PD] a couple complex number abstractions

[Kyle Klipowicz]

Great work! I'd suggest modeling fbar's approach and making a
*-help.pd file for either each of them, or the whole group at least.

Also, even if they seem trivial, if you are making this library of
abstractions for something like CVS (which would be GREAT), it would
be nice to have the conjugate, addition, and subtraction also.

Thanks for sharing this!

~Kyle

On 2/24/07, Charles Henry <czhenry at gmail.com> wrote:
> Hi, list,
>   I put together a few abstractions I wanted to share.  These are just
> basic operations for complex arithmetic (I left out conjugate,
> addition, and subtraction, since I thought they were too basic).
> cmult~
> -- multiplies two complex signals; inlets are ordered from left to
> right: sig1-real, sig1-imaginary, sig2-real, sig2-imaginary (this is
> consistent for all the rest too)
> conj_mult~
> -- multiplies sig1 by the complex conjugate of sig2
> cnorm~
> -- computes sqrt(real^2+imag^2), Would this be more efficient using expr?
> cnormsq~
> -- computes real^2+imag^2.  Same question as cnorm~
> cdiv~
> -- divides sig1 by sig2.  Wherever sig2 is zero, the result is zero
> rather than undefined.  It is still not advised to use cdiv~ unless
> you have a signal that you know has all of its frequencies
> cdiv_thresh~
> -- accepts a threshold argument, and divides sig1 by sig2 whenever the
> complex norm squared of sig2 is greater than the threshold.  Returns
> zero otherwise.
> Later,
> Chuck
>
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