Time for action – replaying audio clips

We will download a WAV file of Austin Powers exclaiming “Smashing, baby!”. This file can be converted to a NumPy array with the read function from the scipy.io.wavfile module. The write function from the same package will be used to create a new WAV file at the end of this tutorial. We will further use the tile function to replay the audio clip several times. Perform the following steps to do so:

1. Read the file with the read function.

   sample_rate, data = wavfile.read(WAV_FILE)

   This gives us two items – sample rate and audio data. For this tutorial we are only interested in the audio data.

2. Apply the tile function.

   repeated = np.tile(data, int(sys.argv[1]))

3. Write a new file with the write function.

   wavfile.write(“repeated_yababy.wav”,
       sample_rate, repeated)

   The original audio data and the audio clip repeated four times are shown in the following plot:

   

What just happened?

We read an audio clip, repeated it four times and then created a new WAV file with the...