improved conversion

utils.py

@@ -515,10 +515,13 @@ def segment_analysis(segment, sr, s1s2:list):
     # RMS Energy
     rms_energy = np.sqrt(np.mean(segment**2))
     
-    # Calculate actual mean frequency
-    fft = np.fft.rfft(segment)
+    # Calculate frequency spectrum and find dominant frequencies
+    fft = np.abs(np.fft.rfft(segment))
     freqs = np.fft.rfftfreq(len(segment), d=1/sr)
-    mean_frequency = np.mean(freqs)
+    # Focus on frequency range typical for heart sounds (20-200 Hz)
+    mask = (freqs >= 20) & (freqs <= 200)
+    dominant_freq_idx = np.argmax(fft[mask])
+    mean_frequency = freqs[mask][dominant_freq_idx]
     
     s1_to_s2_duration = []
     s2_to_s1_duration = []