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SPEAKE(a)R: Turn Speakers to Microphones for Fun and Profit [pdf] (2017)

Author Fabrice Bellard demonstrates a 200-line C routine that exploits speaker coils as microphones, using a $5 audio interface to achieve 16-bit, 48 kHz recording. Both security researchers and hobbyist tinkerers jumped into the thread, arguing whether this is a bug or a feature.

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SPEAKE(a)R: Turn Speakers to Microphones for Fun and Profit [pdf] (2017)

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