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tests/src/temporal/test-filter.c: improve

--- a/tests/src/temporal/test-filter.c

+++ b/tests/src/temporal/test-filter.c

@@ -2,12 +2,13 @@

 int main ()

 {

-  uint_t win_s = 32; // window size

+  uint_t win_s = 16; // window size

+  uint_t impulse_at = win_s / 2;

   fvec_t *in = new_fvec (win_s); // input buffer

   fvec_t *out = new_fvec (win_s); // input buffer

   aubio_filter_t *o = new_aubio_filter_c_weighting (44100);

-  in->data[12] = 0.5;

+  in->data[impulse_at] = 0.5;

   fvec_print (in);

   aubio_filter_do (o, in);

   fvec_print (in);

@@ -14,13 +15,13 @@

   del_aubio_filter (o);

   o = new_aubio_filter_a_weighting (32000);

-  in->data[12] = 0.5;

+  in->data[impulse_at] = 0.5;

   fvec_print (in);

   aubio_filter_do_outplace (o, in, out);

   fvec_print (out);

   aubio_filter_set_a_weighting (o, 32000);

-  in->data[12] = 0.5;

+  in->data[impulse_at] = 0.5;

   fvec_print (in);

   aubio_filter_do_filtfilt (o, in, out);

   fvec_print (out);