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Let hilbert use a Blackman window for even less ripple

--- a/src/hilbert.c

+++ b/src/hilbert.c

@@ -59,9 +59,9 @@

   if (!f->num_taps) {

     int i;

     if (!p->taps) {

-      p->taps = effp->in_signal.rate/100 + 2;

+      p->taps = effp->in_signal.rate/76.5 + 2;

       p->taps += 1 - (p->taps%2);

-      /* results in a cutoff frequency of about 75 Hz */

+      /* results in a cutoff frequency of about 75 Hz with a Blackman window */

       lsx_debug("choosing number of taps = %d (override with -n)", p->taps);

     }

     lsx_valloc(p->h, p->taps);

@@ -74,7 +74,7 @@

         p->h[i] = (1 - cos(pk))/pk;

       }

     }

-    lsx_apply_hamming(p->h, p->taps);

+    lsx_apply_blackman(p->h, p->taps, .16);

     if (effp->global_info->plot != sox_plot_off) {

       char title[100];