Changeset fff2bee

Timestamp:

Apr 17, 2007, 9:59:15 PM (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:

5507e9d

Parents:

3fd2dc1

Message:

mathutils.c: add aubio_zero_crossing_rate at Amaury's request

Location:

src

Files:

• mathutils.c (modified) (1 diff)
• mathutils.h (modified) (1 diff)

src/mathutils.c

@@ -441 +441 @@
 }
 
+smpl_t aubio_zero_crossing_rate(fvec_t * input) {
+  uint_t i=0,j;
+  uint_t zcr = 0;
+  for ( j = 1; j < input->length; j++ ) {
+    // previous was negative
+    if( input->data[i][j-1] <= 0. ) {
+      if ( input->data[i][j] > 0. ) {
+        zcr += 1;
+      }
+    //previous was positive
+    } else if ( input->data[i][j] <= 0. ){
+      zcr += 1;
+    }
+  }
+  return zcr/(smpl_t)input->length;
+}
+
 void aubio_autocorr(fvec_t * input, fvec_t * output){
         uint_t i = 0, j = 0, length = input->length;

src/mathutils.h

@@ -205 +205 @@
 void aubio_autocorr(fvec_t * input, fvec_t * output);
 /**
+ * zero-crossing rate (number of zero cross per sample)
+ */
+smpl_t aubio_zero_crossing_rate(fvec_t * input);
+/**
  * clean up cached memory at the end of program
  *