What is Audio Normalization and Compression?

http://www.lockergnome.com/media/2011/07/29/how-compression-and-normalization-effects-the-listening-experience/
http://chris.pirillo.com/why-are-commercials-louder/?

In this video, Brandon explains how audio compression and normalization work in relation to the audio you hear on a television. Have you ever wondered why commercials still appear to be louder than you show, even though there's a regulation in place stating the average volume has to match?

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