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I did basic voice recognition on an Atari ST (8MHz 68000, 8-bit mono sampling1). If it could be done on a 1985 desktop2 then it should be no problem for an early naughties cell-phone3. IIRC4, the algorithm was roughly as follows: Sample the audio (8-bit mono @ 22kHz?) Split the audio into short (½ second?) pieces Do an FFT on each piece. The results are ...


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