add postprocessing package and create module for audio export

src/postprocessing/__init__.py

@@ -0,0 +1,12 @@
+# __init__.py
+
+import logging
+from datetime import datetime
+
+# Configure logging
+logging.basicConfig(
+    format='%(asctime)s : %(message)s',
+    level = logging.INFO
+)
+
+logging.info("freq-split-enhance/postprocessing package has been imported.")

src/postprocessing/audio_writer.py

@@ -0,0 +1,17 @@
+import soundfile as sf
+
+def export_audio(audio, output_path, sr):
+    """
+    Save a NumPy audio array to a specified audio file.
+
+    Args:
+        audio (numpy.ndarray): The audio data to be saved.`
+        output_path (str): The path where the audio file should be saved.
+        sr (int): The sampling rate of the audio.
+    """
+
+    try:
+        sf.write(output_path, audio, sr)
+        print(f"Audio saved to {output_path}")
+    except Exception as e:
+        print(f"Error saving audio: {e}")