Changeset 0dbdb40 for src/mathutils.c

Timestamp:

Apr 18, 2007, 1:07:48 AM (17 years ago)

Author:

Paul Brossier <piem@piem.org>

Branches:

feature/autosink, feature/cnn, feature/cnn_org, feature/constantq, feature/crepe, feature/crepe_org, feature/pitchshift, feature/pydocstrings, feature/timestretch, fix/ffmpeg5, master, pitchshift, sampler, timestretch, yinfft+

Children:

c8b80cd

Parents:

5507e9d

Message:

mathutils.c: add aubio_spectral_centroid

File:

• src/mathutils.c (modified) (1 diff)

src/mathutils.c

@@ -458 +458 @@
 }
 
+smpl_t aubio_spectral_centroid(cvec_t * spectrum, smpl_t samplerate) {
+  uint_t i=0, j;
+  smpl_t sum = 0., sc = 0.;
+  for ( j = 0; j < spectrum->length; j++ ) {
+    sum += spectrum->norm[i][j];
+  }
+  if (sum == 0.) return 0.;
+  for ( j = 0; j < spectrum->length; j++ ) {
+    sc += (smpl_t)j * spectrum->norm[i][j];
+  }
+  return sc / sum * samplerate / (smpl_t)(spectrum->length);
+}
+
 void aubio_autocorr(fvec_t * input, fvec_t * output){
         uint_t i = 0, j = 0, length = input->length;