diff --git a/schainc/_noise.c b/schainc/_noise.c
new file mode 100644
index 0000000..32100c8
--- /dev/null
+++ b/schainc/_noise.c
@@ -0,0 +1,82 @@
+#include <Python.h>
+#include <numpy/arrayobject.h>
+#include <math.h>
+
+
+static PyObject *hildebrand_sekhon(PyObject *self, PyObject *args) {
+  double navg;
+  PyObject *data_obj, *data_array;
+
+  if (!PyArg_ParseTuple(args, "Od", &data_obj, &navg)) {
+      return NULL;
+  }
+  
+  data_array = PyArray_FROM_OTF(data_obj, NPY_FLOAT64, NPY_IN_ARRAY);
+  
+  if (data_array == NULL) {
+      Py_XDECREF(data_array);
+      Py_XDECREF(data_obj);
+      return NULL;
+  }
+  double *sortdata = (double*)PyArray_DATA(data_array);
+  int lenOfData = (int)PyArray_SIZE(data_array) ;
+  double nums_min = lenOfData*0.2;
+  if (nums_min <= 5) nums_min = 5;
+  double sump = 0;
+  double sumq = 0;
+  int j = 0;
+  int cont = 1;
+  double rtest = 0;
+  while ((cont == 1) && (j < lenOfData)) {
+    sump = sump + sortdata[j];
+    sumq = sumq + pow(sortdata[j], 2);
+    if (j > nums_min) {
+      rtest = (double)j/(j-1) + 1/navg;
+      if ((sumq*j) > (rtest*pow(sump, 2))) {
+        j = j - 1;
+        sump = sump - sortdata[j];
+        sumq = sumq - pow(sortdata[j],2);
+        cont = 0;
+      }
+    }
+    j = j + 1;
+  }
+
+  double lnoise = sump / j;
+
+  Py_DECREF(data_array);
+
+  return PyLong_FromLong(lnoise);
+  //return Py_BuildValue("d", lnoise);
+}
+
+
+static PyMethodDef noiseMethods[] = {
+  { "hildebrand_sekhon", hildebrand_sekhon, METH_VARARGS, "Get noise with hildebrand_sekhon algorithm" },
+  { NULL, NULL, 0, NULL }
+};
+
+#if PY_MAJOR_VERSION >= 3
+
+static struct PyModuleDef noisemodule = {
+  PyModuleDef_HEAD_INIT,
+  "_noise",
+  "Get noise with hildebrand_sekhon algorithm",
+  -1,
+  noiseMethods
+};
+
+#endif
+
+#if PY_MAJOR_VERSION >= 3
+  PyMODINIT_FUNC PyInit__noise(void) {
+    Py_Initialize();
+    import_array();
+    return PyModule_Create(&noisemodule);
+  }
+#else
+  PyMODINIT_FUNC init_noise() {
+    Py_InitModule("_noise", noiseMethods);
+    import_array();
+  }
+#endif
diff --git a/schainpy/model/data/jrodata.py b/schainpy/model/data/jrodata.py
index cdd83b7..042ae22 100644
--- a/schainpy/model/data/jrodata.py
+++ b/schainpy/model/data/jrodata.py
@@ -12,6 +12,7 @@ import json
 import schainpy.admin
 from schainpy.utils import log
 from .jroheaderIO import SystemHeader, RadarControllerHeader
+from schainpy.model.data import _noise
 
 
 def getNumpyDtype(dataTypeCode):
@@ -69,6 +70,7 @@ def hildebrand_sekhon(data, navg):
     """
 
     sortdata = numpy.sort(data, axis=None)
+    '''
     lenOfData = len(sortdata)
     nums_min = lenOfData*0.2
 
@@ -98,8 +100,8 @@ def hildebrand_sekhon(data, navg):
         j += 1
 
     lnoise = sump / j
-
-    return lnoise
+    '''
+    return _noise.hildebrand_sekhon(sortdata, navg)
 
 
 class Beam:
diff --git a/setup.py b/setup.py
index 9516c75..3f28ddf 100644
--- a/setup.py
+++ b/setup.py
@@ -2,6 +2,7 @@
 Created on Jul 16, 2014
 
 @author: Miguel Urco
+@author: Juan C. Espinoza
 '''
 
 import os
@@ -17,47 +18,51 @@ class build_ext(_build_ext):
         import numpy
         self.include_dirs.append(numpy.get_include())
 
-setup(name = "schainpy",
-      version = __version__,
-      description = "Python tools to read, write and process Jicamarca data",
-      author = "Miguel Urco",
-      author_email = "miguel.urco@jro.igp.gob.pe",
-      url = "http://jro.igp.gob.pe",
-      packages = {'schainpy',
-                  'schainpy.model',
-                  'schainpy.model.data',
-                  'schainpy.model.graphics',
-                  'schainpy.model.io',
-                  'schainpy.model.proc',
-                  'schainpy.model.serializer',
-                  'schainpy.model.utils',
-                  'schainpy.utils',
-                  'schainpy.gui',
-                  'schainpy.gui.figures',
-                  'schainpy.gui.viewcontroller',
-                  'schainpy.gui.viewer',
-                  'schainpy.gui.viewer.windows',
-                  'schainpy.cli'},
-      ext_package = 'schainpy',      
-      package_data = {'': ['schain.conf.template'],
-                      'schainpy.gui.figures': ['*.png', '*.jpg'],
-                      'schainpy.files': ['*.oga']
-                     },
-      include_package_data = False,
-      scripts = ['schainpy/gui/schainGUI'],
-      entry_points = {
-          'console_scripts': [
-              'schain = schainpy.cli.cli:main',
-          ],
-      },
-      cmdclass = {'build_ext': build_ext},
-      setup_requires = ["numpy >= 1.11.2"],
-      install_requires = [
-          "scipy",
-          "h5py",
-          "matplotlib",
-          "pyzmq",
-          "fuzzywuzzy",
-          "click",
-          ],
+setup(
+    name = "schainpy",
+    version = __version__,
+    description = "Python tools to read, write and process Jicamarca data",
+    author = "Miguel Urco, Juan C. Espinoza",
+    author_email = "juan.espinoza@jro.igp.gob.pe",
+    url = "http://jro-dev.igp.gob.pe/rhodecode/schain",
+    packages = {
+        'schainpy',
+        'schainpy.model',
+        'schainpy.model.data',
+        'schainpy.model.graphics',
+        'schainpy.model.io',
+        'schainpy.model.proc',
+        'schainpy.model.utils',
+        'schainpy.utils',
+        'schainpy.gui',
+        'schainpy.gui.figures',
+        'schainpy.gui.viewcontroller',
+        'schainpy.gui.viewer',
+        'schainpy.gui.viewer.windows',
+        'schainpy.cli',
+        },
+    package_data = {'': ['schain.conf.template'],
+                    'schainpy.gui.figures': ['*.png', '*.jpg'],
+                    'schainpy.files': ['*.oga']
+                    },
+    include_package_data = False,
+    scripts = ['schainpy/gui/schainGUI'],
+    entry_points = {
+        'console_scripts': [
+            'schain = schainpy.cli.cli:main',
+            ],
+        },
+    cmdclass = {'build_ext': build_ext},
+    ext_modules=[
+        Extension("schainpy.model.data._noise", ["schainc/_noise.c"]),
+        ],
+    setup_requires = ["numpy"],
+    install_requires = [
+        "scipy",
+        "h5py",
+        "matplotlib",
+        "pyzmq",
+        "fuzzywuzzy",
+        "click",
+        ],
 )