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dear sir/Madam i want to know some information about using voice in mcu ,i know need a D/A device for this reason, but i dont know how i use mp3 file in ROM,and how transfer this file to D/A you are very kindly to advise me
See the Atmel AT89C51SND1, mentioned above. It has the MP3 hardware (and more) and an 8051 controller integrated onto a single chip.