diff --git a/.gitignore b/.gitignore
index fc126c9..9e90d22 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@ TinnitusAnalyse/.idea/dictionaries/Julian.xml
 TinnitusAnalyse/.idea/workspace.xml
 TinnitusAnalyse/eggs.csv
 TinnitusAnalyse/.idea/workspace.xml
+*.xml
diff --git a/TinnitusAnalyse/.idea/workspace.xml b/TinnitusAnalyse/.idea/workspace.xml
index 427fc26..33d846b 100644
--- a/TinnitusAnalyse/.idea/workspace.xml
+++ b/TinnitusAnalyse/.idea/workspace.xml
@@ -2,8 +2,8 @@
 <project version="4">
   <component name="ChangeListManager">
     <list default="true" id="5b3f2136-e422-4072-84be-e86e40fa2d55" name="Default Changelist" comment="">
+      <change afterPath="$PROJECT_DIR$/DigitalFilter1.py" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/TinnitusAnalyse_GUI.py" beforeDir="false" afterPath="$PROJECT_DIR$/TinnitusAnalyse_GUI.py" afterDir="false" />
     </list>
     <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
     <option name="SHOW_DIALOG" value="false" />
@@ -16,8 +16,8 @@
       <file pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/TinnitusAnalyse_GUI.py">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="-1464">
-              <caret line="14" lean-forward="true" selection-start-line="14" selection-end-line="14" />
+            <state relative-caret-position="17">
+              <caret line="14" selection-start-line="14" selection-end-line="14" />
               <folding>
                 <element signature="e#0#117#0" expanded="true" />
               </folding>
@@ -34,11 +34,11 @@
           </provider>
         </entry>
       </file>
-      <file pinned="false" current-in-tab="true">
+      <file pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/SoundGenerator.py">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="1034">
-              <caret line="92" lean-forward="true" selection-start-line="92" selection-end-line="92" />
+            <state relative-caret-position="688">
+              <caret line="80" column="119" lean-forward="true" selection-start-line="80" selection-start-column="60" selection-end-line="80" selection-end-column="119" />
               <folding>
                 <element signature="e#0#11#0" expanded="true" />
               </folding>
@@ -46,6 +46,27 @@
           </provider>
         </entry>
       </file>
+      <file pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/DigitalFilter1.py">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="1782">
+              <caret line="81" column="28" lean-forward="true" selection-start-line="81" selection-start-column="28" selection-end-line="81" selection-end-column="28" />
+              <folding>
+                <element signature="e#0#47#0" expanded="true" />
+              </folding>
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file pinned="false" current-in-tab="false">
+        <entry file="file://$USER_HOME$/AppData/Local/Programs/Python/Python35/Lib/site-packages/matplotlib/axes/_base.py">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="330">
+              <caret line="230" selection-start-line="230" selection-end-line="230" />
+            </state>
+          </provider>
+        </entry>
+      </file>
       <file pinned="false" current-in-tab="false">
         <entry file="file://$USER_HOME$/AppData/Local/Programs/Python/Python35/Lib/tkinter/ttk.py">
           <provider selected="true" editor-type-id="text-editor">
@@ -92,6 +113,7 @@
         <option value="$PROJECT_DIR$/WriteToCSV.py" />
         <option value="$PROJECT_DIR$/SoundGenerator.py" />
         <option value="$PROJECT_DIR$/TinnitusAnalyse_GUI.py" />
+        <option value="$PROJECT_DIR$/DigitalFilter1.py" />
       </list>
     </option>
   </component>
@@ -131,7 +153,28 @@
       </list>
     </option>
   </component>
-  <component name="RunManager" selected="Python.TinnitusAnalyse_GUI">
+  <component name="RunManager" selected="Python.DigitalFilter1">
+    <configuration name="DigitalFilter1" type="PythonConfigurationType" factoryName="Python" temporary="true">
+      <module name="TinnitusAnalyse" />
+      <option name="INTERPRETER_OPTIONS" value="" />
+      <option name="PARENT_ENVS" value="true" />
+      <envs>
+        <env name="PYTHONUNBUFFERED" value="1" />
+      </envs>
+      <option name="SDK_HOME" value="" />
+      <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$" />
+      <option name="IS_MODULE_SDK" value="true" />
+      <option name="ADD_CONTENT_ROOTS" value="true" />
+      <option name="ADD_SOURCE_ROOTS" value="true" />
+      <option name="SCRIPT_NAME" value="$PROJECT_DIR$/DigitalFilter1.py" />
+      <option name="PARAMETERS" value="" />
+      <option name="SHOW_COMMAND_LINE" value="false" />
+      <option name="EMULATE_TERMINAL" value="false" />
+      <option name="MODULE_MODE" value="false" />
+      <option name="REDIRECT_INPUT" value="false" />
+      <option name="INPUT_FILE" value="" />
+      <method v="2" />
+    </configuration>
     <configuration name="SoundGenerator" type="PythonConfigurationType" factoryName="Python" temporary="true">
       <module name="TinnitusAnalyse" />
       <option name="INTERPRETER_OPTIONS" value="" />
@@ -197,6 +240,7 @@
     </configuration>
     <recent_temporary>
       <list>
+        <item itemvalue="Python.DigitalFilter1" />
         <item itemvalue="Python.TinnitusAnalyse_GUI" />
         <item itemvalue="Python.SoundGenerator" />
         <item itemvalue="Python.WriteToCSV" />
@@ -225,7 +269,7 @@
       <window_info id="Favorites" order="2" side_tool="true" />
       <window_info anchor="bottom" id="Message" order="0" />
       <window_info anchor="bottom" id="Find" order="1" />
-      <window_info anchor="bottom" id="Run" order="2" weight="0.20732658" />
+      <window_info active="true" anchor="bottom" id="Run" order="2" visible="true" weight="0.2548714" />
       <window_info anchor="bottom" id="Debug" order="3" weight="0.39977604" />
       <window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
       <window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
@@ -279,23 +323,40 @@
     </entry>
     <entry file="file://$PROJECT_DIR$/TinnitusAnalyse_GUI.py">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="-1464">
-          <caret line="14" lean-forward="true" selection-start-line="14" selection-end-line="14" />
+        <state relative-caret-position="17">
+          <caret line="14" selection-start-line="14" selection-end-line="14" />
           <folding>
             <element signature="e#0#117#0" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
+    <entry file="file://$USER_HOME$/AppData/Local/Programs/Python/Python35/Lib/site-packages/matplotlib/axes/_base.py">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="330">
+          <caret line="230" selection-start-line="230" selection-end-line="230" />
+        </state>
+      </provider>
+    </entry>
     <entry file="file://$PROJECT_DIR$/SoundGenerator.py">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="1034">
-          <caret line="92" lean-forward="true" selection-start-line="92" selection-end-line="92" />
+        <state relative-caret-position="688">
+          <caret line="80" column="119" lean-forward="true" selection-start-line="80" selection-start-column="60" selection-end-line="80" selection-end-column="119" />
           <folding>
             <element signature="e#0#11#0" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
+    <entry file="file://$PROJECT_DIR$/DigitalFilter1.py">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="1782">
+          <caret line="81" column="28" lean-forward="true" selection-start-line="81" selection-start-column="28" selection-end-line="81" selection-end-column="28" />
+          <folding>
+            <element signature="e#0#47#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
   </component>
 </project>
\ No newline at end of file
diff --git a/TinnitusAnalyse/DigitalFilter.py b/TinnitusAnalyse/DigitalFilter.py
new file mode 100644
index 0000000..6c03c6b
--- /dev/null
+++ b/TinnitusAnalyse/DigitalFilter.py
@@ -0,0 +1,96 @@
+import matplotlib.pyplot as plt  # For plotting
+from math import sin, pi, cos  # For generating input signals
+import numpy as np
+import sys  # For reading command line arguments
+
+
+fs = 44100  # sampling frequency (Abtastfrequenz)
+
+koeff = {
+    "b0": 0,
+    "b1": 0,
+    "b2": 0,
+    "a1": 0,
+    "a2": 0
+}
+
+def koeffizienten_berechnen(omega, r):
+    # Koeffizientenberechnung nach Tobola VL S.107 - IIR Filter, 2. Ordnung
+    koeff["b0"] = 1
+    koeff["b1"] = 0
+    koeff["b2"] = -1
+    koeff["a1"] = -2*r*cos(omega)
+    koeff["a2"] = r**2
+
+def filter(x):
+    y = [0]*len(x)
+    for k in range(4, len(x)):
+        y[k] = koeff["b0"]*x[k] + koeff["b1"]*x[k-1] + koeff["b2"]*x[k-2] - koeff["a1"]*y[k-1] - koeff["a2"]*y[k-2]
+
+    return y
+
+
+
+
+dauer_ms = 10000  # 10 Sekunden
+num_samples = dauer_ms * (fs / 1000)  # framerate -pro Sekunde- umgerechnet in -pro Millisekunde-
+
+t = np.linspace(0, 10, int(num_samples)) # array zum darstellen der x-Achse
+amp = 1
+
+f_input1 = 1
+f_input2 = 5
+f_input3 = 10
+
+input1 = []
+input2 = []
+input3 = []
+for x in range(int(num_samples)):  # einen einfachen Sinus ins array schreiben
+    input1.append(amp * sin(2 * pi * f_input1 * (x / fs)))
+    input2.append(amp * sin(2 * pi * f_input2 * (x / fs)))
+    input3.append(amp * sin(2 * pi * f_input3 * (x / fs)))
+
+
+input_ges = np.add(input1, input2) # Sinus aufaddieren um ein halbwegs realistisches Audiosignal zu bekommen
+#input_ges = np.add(input_ges, input3)
+
+#Filterparameter hier einstellen
+fr = 5
+omega = 2*pi*fr/fs
+r = 0.01
+koeffizienten_berechnen(omega, r)   # Koeffizienten berechnen mit Mittelfrequenz 10Hz
+
+output = filter(input_ges)
+
+### Plot the signals for comparison
+plt.figure(1)
+plt.subplot(231)
+plt.ylabel('Amplitude')
+plt.xlabel('t [s]')
+plt.title('Input1 f=' + str(f_input1) + "Hz")
+plt.plot(t, input1)
+
+plt.subplot(232)
+plt.ylabel('Amplitude')
+plt.xlabel('t [s]')
+plt.title('Input2 f=' + str(f_input2) + "Hz")
+plt.plot(t, input2)
+
+# plt.subplot(233)
+# plt.ylabel('Amplitude')
+# plt.xlabel('t [s]')
+# plt.title('Input3 f=' + str(f_input3) + "Hz")
+# plt.plot(t, input3)
+
+plt.subplot(234)
+plt.ylabel('Amplitude')
+plt.xlabel('t [s]')
+plt.title('input_ges = i1 + i2')
+plt.plot(t, input_ges)
+
+plt.subplot(235)
+plt.ylabel('Amplitude')
+plt.xlabel('Samples')
+plt.title('gefiltertes Signal mit Resonanzfrequenz = ' + str(fr) + "Hz")
+plt.plot(t, output)
+plt.show()
\ No newline at end of file