Piezoelectric buzzer teardown

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A teardown of piezoelectric buzzer from  Electronupdate:

An assembly commonly used on fire, burglar and similar alarm systems.
Based around a piezoelectric disk coupled to a plastic cylinder with a hole on the end (used to amplify the sound).
The controller appears to use a rom-based look up table to generate the sounds
The pattern right below the array almost looks like a series of digital wave forms. I think this is strong evidence of an address decoder.. I presume there is a decoder below each of the columns which actives if the pattern matchs.

More details at Electronupdate blog.

Check out the video after the break.

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