Fix typo

app.py

@@ -105,9 +105,10 @@ def process_func(x: np.ndarray, sampling_rate: int) -> dict:
 def recognize(input_microphone, input_file):
     if input_microphone:
         sampling_rate, signal = input_microphone
+        signal = signal.astype(np.float32, order="C") / 32768.0
     elif input_file:
         signal, sampling_rate = audiofile.read(file, duration=duration)
-    else::
+    else:
         raise gr.Error(
             "No audio file submitted! "
             "Please upload or record an audio file "