changeset 1:003b86796d1b

Creates/saves a new wav file that contains only the first half second of audio of the original file.

--- a/audio_io.py	Mon Feb 11 15:41:00 2013 +0000
+++ b/audio_io.py	Mon Feb 11 16:00:03 2013 +0000
@@ -40,3 +40,31 @@
 
 # play the audio file data in 'samples' at the sampling frequency 'fs'
 audiolab.play(samples,fs)
+
+#################
+## Choosing only the first half second of audio
+#################
+
+# the new number of samples is the
+# (duration times sampling frequency)
+new_nsamples = 0.5 * fs
+
+# creating the new samples array
+new_samples = samples[0:new_nsamples]
+
+#################
+## Writing the shorter audio to a new file
+#################
+
+# create a name for the new file
+new_filename = 'output_file.wav'
+
+# Create a Sndfile instance for writing a mono wav file @ 44100 Hz
+format = audiolab.Format('wav')
+f = audiolab.Sndfile(new_filename, 'w', format, 1, 44100)
+
+# Write out the shorter audio file
+f.write_frames(new_samples)
+
+# close the audio file
+f.close()