How can I Compare 2 Audio Files Programmatically?

Question

I want to compare 2 audio files programmatically. For example: I have a sound file in my iPhone app, and then I record another one. I want to check if the existing sound mat

Answer 1

• Apply bandpass filter to reduce noise
• Normalize for amplitude
• Calculate the cross-correlation

It can be fairly Mhz intensive.

The DSP details are in the well known text:

• Digital Signal Processing by Alan V. Oppenheim and Ronald W. Schafer