On 07/05, Julius Smith wrote: > > Do we know its copyright status? I think it would > be worth adding to the library if we can determine this and author.
I found it here: http://yehar.com/blog/?p=368 But see also the hiir library http://ldesoras.free.fr/src/hiir-1.20.zip from Laurent de Soras mentioned in the page above. See the comments at the top of hiir/PolyphaseIir2Designer.h which describe the same design. You can get (almost) the same numbers using compute_coefs_spec_order_tbw(), but don't forget that the code I sent uses c^2 so they can look different. Again, you can try hiir_hilber(N, T) = hilbert with { coef = FPP(=N, =T) eval { FILE: #include <hiir/PolyphaseIir2Designer.cpp> init: hiir::PolyphaseIir2Designer::compute_coefs_spec_order_tbw($c, 2*$N, $T); decl: double $c[2*$N]; exec: $c; }; getc = FPP(i, n, =coef) { $coef[$i + 2*$n] }; hilbert = _ <: H(0), H(1)' with { ap(a) = f ~ _ with { f(y, x) = a * (x + y') - x''; }; H(i) = seq(n, N, ap(getc(i,n))); }; }; if you unzip that library and pass -Ipath/to/hiir to gcc. For example, process = 1-1' : hiir_hilber(4, 2*20.0/44100); generates almost the same responce. Oleg. _______________________________________________ Faudiostream-users mailing list Faudiostream-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/faudiostream-users
