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iPod Firmware Acoustically Reverse Engineered |
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| Tue, March 01 2005 | 12:11PM | PermaLink |
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"The whole idea started last week when leachbj gave me a piece of code that caused the piezo in the iPod to make some *squeek*-sound. I played around with that code, changed some values and somehow was able to produce different sounds. Just for fun I came up with the idea of using this different sounds for transferring data. Some minutes later I dropped the idea because I thought that just won't work and I won't be able to write a decoder for that. Two days later I woke up and somehow just tried encoding a 32bit value into different beeps. It worked so made a loop around it to dump about 4kb of memory."
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FULL STORY @
Archived from IPODLINUX
http://www.ipodlinux.org/stories/piezo/
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