skeletons are back in the closet

src/preprocessor/__init__.py

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+#!/usr/bin/env python3
+from .soundpreprocessor import SoundPreProcessor

src/preprocessor/soundpreprocessor.py

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+#!/usr/bin/env python3
+from .abcpreprocessor import AbcPreProcessor
+
+"""
+Abstract base class for Sender
+"""
+
+__author__ = "@tormakris"
+__copyright__ = "Copyright 2020, Birbnetes Team"
+__module_name__ = "soundpreprocessor"
+__version__text__ = "1"
+
+
+class SoundPreProcessor(AbcPreProcessor):
+    """
+    SoundPreProcessor class, responsible for detecting birb chirps in sound sample.
+    """
+    def preprocesssignal(self, signal):
+        """
+        Classify a sound sample.
+        :return:
+        """
+        pass