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src/spectral/phasevoc.c: fix scaling factor for win_s = 4 * hop_s

--- a/src/spectral/phasevoc.c

+++ b/src/spectral/phasevoc.c

@@ -119,7 +119,8 @@

   pv->end_datasize = pv->end * sizeof(smpl_t);

   pv->hop_datasize = pv->hop_s * sizeof(smpl_t);

-  pv->scale = pv->hop_s * 2. / pv->win_s;

+  // for reconstruction with 75% overlap

+  pv->scale = 2./3.;

   return pv;